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    The Rarest Place on Earth

    Archie Carr III

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    The Rarest Place on Earth

    Shortly after sunup, I checked out of my room in Belize City, hailed a

    bent and rusty taxi, and clattered the short distance to Municipal Airport,debarking at the busy little departure office of Tropic Air. From there, it

    was a quick and, at that hour, invigorating, 20-minute flight out over the

    water to San Pedro on Ambergris Cay. San Pedro lies just minutes by skiff

    from the Belize Barrier Reef, and, during the past 25 years, has grown into

    one of the most popular dive destinations in the Caribbean. San Pedro, now

    beginning to sprawl out from its old fishing-town boundaries, was at the

    southern tip of Ambergris Cay; so far south that engineers had recently

    begun dredging and filling in the mangroves to build, oddly enough, both

    cheap homes for the terribly poor, and luxury accommodations for the very

    rich.

    I had phoned ahead to charter a skiff to take me to the north of

    Ambergris, to a place called Bacalar Chico, a national park with terrestrial

    and marine components that also happened to rest on the Belize-Mexico

    border. At Bacalar Chico I would find a site that I had come to think of over

    the years as the rarest place on earth: a spot where the barrier reef came so

    close, it kissed the mainland shore. I wanted to check the health of the reef

    at this, its most northern extremity in Belizean waters. I wanted to witness

    the shocking findings of my friend, Melanie McField, who had reported in

    her recently completed doctoral dissertation that 48 percent of the corals ofBelize were bleached into oblivion.

    The skipper of my painted mahogany skiff was a broad-faced San

    Pedrano, a young man of Yucatecan extraction, who welcomed me aboard

    with tremendous good-cheer. San Pedro town is a happy place because of

    the hearty, wholesome, reef-oriented life, and because of all the tourist

    money in circulation. Miguel, my pilot, took his place at the center-mounted

    console, fixed his eyes on the horizon, pushed the boat quickly up to a plane,

    and pointed her north. We would scoot up the coast on the inside of

    Ambergris Cay, the lee side, over the shallow waters of Chetumal Bay,

    through an early morning that was almost breezeless, and still sweet with the

    damp of last nights showers.

    I sat on a bench directly in front of Miguel's control console. I had

    sunshades to cut the dazzle of the sky and water, and I reversed my cap to

    save it from the wind. Lulled by the hum of the engine and the crackle of

    the wooden hull on tiny ripples, I drifted into a pleasant trance. We had

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    more than an hour to run in this quick boat, and Miguel had brought a

    thermos of coffee, so the morning was unfolding in an agreeable way. A

    frigate bird passed high overhead hanging, as always, in a posture of casual

    grace, gliding east, to cross the belly of the big island; I guessed to soar for

    the morning above the barrier reef.

    My mind, too, returned to the reef, to its plight. I had been at the

    station out at Glover's Reef not long ago. My old friend, Jacque Carter had

    been there, planning a grouper study. And Tim McClanahan had been there,

    too. Good luck for me. Jacque (That's his name:Jacque, notJacques;

    although he was named after Jacques Yves-Cousteau. His mother couldn't

    see any use for the terminal "s," so she dropped it from her newborns

    name.) Jacque had helped me and Janet Gibson start theWildlife

    Conservation Societysresearch and conservation program on the barrier

    reef 25 years before. Jacque and his wife, Judy, had raised 2 babies during

    the long duration of Jacque's studies of Nassau grouper and their relatives.He had become a part of the Belizean family of reef aficionados, advocates,

    and scientists. Jacque was now a dean at a small New England university,

    but received grant support from WCS on a regular basis. Tim McClanahan,

    on the other hand, was mainline WCS staff. Tim and his family lived in

    Mombassa, Kenya, where Tim carried on long-term studies of coral reefs in

    the Indian Ocean. Once theMiddle Cay research stationhad become a

    reality, Tim had made it his habit to visit once a year to monitor the health of

    the corals on the atoll.

    The crisis faced by the Belizean reefs is not altogether easy to

    comprehend. I had grappled with it for some time, of course, trying to

    understand the problem better, always hoping for fixes, solutions---things

    that we might try to do to improve the outlook. When we bought the island

    on Glover's Reef, for example, our motivation was to help manage a big

    marine park. Being so far at sea, we were confident ourreefs would be

    entirely free of pollution and sedimentation from the mainland. We would

    be able to focus on anti-poaching, monitoring, and environmental education.

    And yet, as though flooded with fertilizer, an explosion of algae a rooted

    or attached, fleshy, brownish form of algae of several species covered

    the shallow-water patch reefs of the atoll very shortly after our field teamshad begun taking notes. Yes, the great banana, pineapple and oil palm

    plantations of coastal Honduras were less than a hundred miles to the south,

    but could the runoff from these farms have reached this far? Wouldn't we

    have seen green algae, phytoplankton, suspended in the water, turning it

    bleary, if the water was enriched with contaminants? There was never any

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    evidence of that. Visibility for divers around Glover's was universally

    memorable, except when storms raised sediments from the bottom.

    If not pollution, then what? Why such an explosion of brown algae

    overgrowing the corals?

    Over a period of a couple of days, I interviewed Jacque and Tim about

    the algae and about the all-too-numerous other problems confronting the

    reef. I swam among some of the 700 reef patches strewn across the shallows

    of the atoll. I dove and looked for the antennae of the spiny lobsters that our

    colleague, Dr. Charles Acosta believed were rebounding thanks to better

    protection in the park. I was gratified to see numerous conchs scattered here

    and there over the bottom, but reminded of how pitifully vulnerable these

    big snails are even to a novice diver. The conchs were back, but the reefs

    themselves were like gardens ravaged by storms. The basic structure was

    there, and fish, especially small fish, abounded; but a third of the flowers of

    the gardens, the individual corals, were pale, covered with silt. Here andthere, healthy remnants could be found: The lower half of one arm of an

    elkhorn; the backside of a massive brain coral; unexpected, warmly

    luminous members of the former garden. This time as I swam, filled with

    the notions of my talks with Jacque and Tim, I thought of myself as a doctor

    peering at his patient, seeking by direct observation a clue, or clues, to this

    trauma.

    It was complicated, all right, but I finally saw that the whole mess

    could be reduced to a narrative. The reef, the greater ecosystem, is suffering

    from four distinct stresses. The four big problems are the virtual extinction

    of the spiny sea urchin,Diadema; over fishing of major predators, like

    snapper and grouper, and of herbivorous fish, like the parrotfish; ocean

    warming; and El Nio. And of course, the four crises aggravate one another,

    yielding a cascade of difficulties for life on the reef.

    The story ofDiadema, the impact of its demise, the fact that the loss

    of such a simple, and occasionally threatening, creature could have such

    widespread repercussions, always surprises me. My reasoning might be a

    little short of scientific, but I always felt that the sea urchins of the

    Caribbean contributed to my upbringing. They trained me as a skin diver,

    just as I was trained as a hiker by rattlesnakes on the farm in Florida where Igrew up. On the farm, my mother warned me: Keep your eyes on the

    ground. I never got snake-bit, but Mother wasnt with me on the reefs. I

    had to learn to watch where my feet were by feeling the pain of the sea

    urchins spines. Famously agonizing, the black spines are 9 inches long,

    brittle as glass slivers, and coated with an excreted slime. Diadema was

    there, in great numbers, on every coral head throughout the Bahamas, the

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    Caymans, Cuba, the Florida Keys, to eat algae, and to train young divers to

    keep their hands and feet off the substrate.

    Today when I leap into shallow water in the Caribbean, I still flinch.

    The training persists; but the threat, the danger, is absent. Vanished, almost

    entirely. Once as abundant as cow pies in a crowded corral, now you would

    be lucky to find two of the big, black, shiny urchins in a day of diving.

    The urchins died of a fungus, it is said. By 1983, an epizootic had

    spread among the urchins, beginning in Trinidad, sweeping north to the

    Florida Keys, killing 90 percent of the ancient echinoderms throughout their

    range.

    As far as the reef is concerned, the urchin is a grazer. It feeds on

    algae that are always trying to establish themselves on or near the reef; and,

    to a limited extent, urchins eat sea grasses. In the old days, sea urchins

    would graze all the turtle grass within about a 10 meter radius of the

    protective coral head. Biologists used to call these bared circles halos.The diameter of the halo was measured by how far the urchins felt they

    could safely graze. Just what the urchins had to fear I cannot say. It is hard

    to imagine the crafty fish or crab that could defeat the terrible spines, but, if

    you happen upon a freshly crushed sea urchin, you will see most every fish

    in the reef rushing in to get a bite. No learning curve there. The entire

    community of denizens seems to be aware of delicious fare concealed in the

    hard shell beneath the waving needles of theDiadema.

    As in other ecosystems, when a grazing species is eliminated from the

    landscape, there will be consequences. First, of course, the vegetation that

    was being grazed will very likely flourish. Secondly, one or more other

    herbivores might grow in abundance in response to the newly available food.

    In the case of the sea urchin ecosystem, algae were seen to explode in

    abundance throughout its old range. Not only in Belizean waters. All over

    the Caribbean, wherever marine biologists were investigating, reports came

    in of a bloom of fixed or attached algae that tended to grow on the corals,

    shading them, quieting surface currents, allowing silt to settle onto the

    delicate polyps, choking them, and preventing larval corals from becoming

    established. The algae seemed to obliterate the living corals, while making

    good use of the coral rock as firmament for attachments.There was no doubt about a dearth of sea urchins at Glover's Reef, and

    as an apparent consequence, there was indeed a plague of algae. The brown,

    tennis ball-sized florets of tough, petal-like flesh were scattered over most of

    the coral patches on the atoll. Tim MacClanahan had several of these

    formations under close scrutiny, and was doing experiments to help get a

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    more in depth, usually near some geomorphic structure: A point of land or

    projection from the barrier reef. It is believed that the current flow around

    these points insures that newly fertilized eggs of the spawning grouper will

    have a greater chance of getting clear of the land and reef, and into the deep,

    pelagic environment, where they must be for a period of time for proper

    early development.

    Adult groupers once congregated by the thousands, by the tens of

    thousands, at each of 9 such sites, or banks, in the waters of Belize. They

    mill around at first, gradually undergoing dramatic color changes, and then

    begin energetic courtship behavior, spiraling upwards, and releasing milt and

    eggs simultaneously into the sea. Hundreds of pairs of fish may be doing

    this at a given moment, and the sea becomes a soup of piscine propagules.

    It so happens that the gathered fish, which, during the rest of the year

    are scattered far, wide and deep across the reef, become ravenous at the

    breeding site. They are utterly vulnerable to a baited hook, and so representa bonanza to a commercial fisherman. Three or more hooks to a line is the

    custom. The fish just keep coming in over the gunwale. They can all be

    captured. The entire breeding stock.

    Jacques Cousteau brought his ship, the Calypso, to Belize in 1972,

    and did some exploring. He got his cameramen down on the Nassau grouper

    bank off Cay Glory, a site on the main barrier reef, almost due east from

    Belize City. This is not necessarily an easy dive. Because of the currents

    that are so important to the fishes reproductive strategy, the diver is

    confronted with the serious challenge of holding station and not being swept

    away into the Caribbean. Cousteau and his men were up to the test, of

    course, and the film was exciting. It showed a cloud of grouper. A column

    of big, oddly colored Nassau grouper, suspended in a featureless, bluish

    medium of open water. For me, it was a remarkable scene for a fish

    normally so tied to the rocks of the reef; a fish known to defend a specific

    sleeping rock for a year at a time.

    Captain Cousteau could not make that film today. The grouper bank

    at Glory Cay was fished out by the late-1980s.

    They took the glory from Glory Cay.

    There was another grouper bank at Rocky Point, up north on the reef.Fishermen in San Pedro told Jacque Carter about Rocky Point. They said

    they didnt discover it until sometime in the 70s. They had been too busy

    fishing lobster in the reef to notice the fish offshore. They said it might

    have been the largest, most fish-laden of all the grouper banks. So many

    fish, they set their gang-hook fishing lines aside and used dynamite. They

    destroyed the fish with explosives over a period of a few years. They killed

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    so many on some days, they couldnt clean them all. Grouper rotted on the

    docks in San Pedro.

    Of the 9 original grouper aggregation banks in Belize, only 2 remain,

    and they continue to attract artisanal fishermen on every 13th

    moon, and for

    2 or 3 full moons thereafter. One of these sites is off the northeast point of

    Glover's Reef. We of the Wildlife Conservation Society have taken a close

    interest in this bank, sending researchers like Enric Salas down to count the

    fish, tagging some with sonic beepers, and, of course making overtures to

    government to do the right thing: Close the banks; let the fish breed and

    replenish the reef. WCS scientists have also made their voices heard in a

    national grouper management council, whose terms of reference include

    the entire barrier reef ecosystem.

    Reduction in the numbers of big predators on the reef will have ---

    must have --- an ecological impact. It is an inescapable outcome, but it is

    not necessarily easy to identify that effect. In the absence of the big hunters,one or more prey species of fish or crustacean must be more abundant, but

    we cant quite say which ones. There is an unidentified ecological

    imbalance in the reef, and that is a scary thing. The conservationist cannot

    sleep well with a mysterious distortion like that lurking in the system.

    What is not uncertain is the visual silence on the reef. Not only are

    the grouper scarce, but so are the other large creatures like sea turtles and

    sharks. If the ecological risk is, at times, obscure, the economic risk is not.

    Scuba divers like to see big fish, and lots of them. If the diving in Belize

    looses its excitement, the economic impact could be staggering. It is a point

    Jacque Carter harps on publicly a lot these days, because, oddly enough, the

    lodge owners and dive masters of Belize appear, at times, timid: The

    political clout of the organized fishermen remains intimidating.

    Troubling as the decline of grouper may be, it doesn't explain the

    explosion of brown algae on Glover's Reef. The grouper is a predator; algae

    control requires an herbivore. Almost concurrently with the loss of the

    grazing sea urchins, some grazing fish must have dropped out of the picture,

    too, and Tim MacClanahan thought it was a parrotfish.

    I had difficulty accepting this theory. I was quite sure no Belizean in

    his or her right mind would eat a parrotfish. But, Tim had other ideas. Hespoke of a "missing herbivore," deducing that there was a species absent

    from the reef. He had to prove a negative.

    Tim's work on the east coast of Africa, where everything is eaten, had

    made him suspicious about the Belize situation. Parrotfish were eliminated

    from the reefs of Kenya, and the algae responded with vigor. Why not

    Belize? I argued with him. I appealed to Jacque Carter, who had

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    inventoried the holds of dozens of fishing smacks. Jacque agreed that it

    would be unusual for a Belizean to keep a parrotfish. These hearty, colorful

    fish, of numerous species, spend a lot of time crunching coral with the

    protruding, powerful teeth that give them their name. They ingest algae,

    which would make them herbivores, but also probably sponges and

    inescapably, the coral polyps themselves, which, I suppose, would make the

    fish omnivores. What passes out the other end is coral sand. Parrotfish

    recycle coral reefs, converting them into soft, creamy-colored sand. Because

    of the encrusting organisms they eat, I always figured parrotfish would taste

    like the devil, and probably carry ciguatera disease.

    The solution to the missing herbivore came on a setting sun on Middle

    Cay. I had arrived there bearing a bottle of spiced rum from the duty free

    store at the international airport. Dinner had been served and eaten, the

    abundant red beans and rice leaving us heavy in the belly, and ready to sit a

    spell and chat. The breeze was light, but had been stiff all day, so thesandflies had been swept away. We sat, and we cut the rum with a fine

    Belizean lime, and sipped it. Danny Wesby was there, a man whose store

    of wry remarks was inexhaustible. Danny was our Number Two at the

    station; Assistant Director, and stood in for the Station Manager as boss of

    the island whenever called upon. He was a waterman. He was an ex-

    commercial fisherman, and he and his family had worked Glover's Reef for

    two generations. His home was in Dangriga on the mainland, directly west

    of us, two hours by swift boat. Danny was a lean man, wiry, with a sly

    smile. He was a master of the double entendre. And his knowledge of the

    reef was mythical in the Stann Creek District.

    It was for Danny and his kin and his water-bound countrymen that we

    had committed ourselves to buying Middle Cay, and taking a stand for

    Glover's Reef, the most magnificent coral atoll in the Caribbean. I had

    certified as much to relevant ministries in Belmopan when we, WCS, were

    seeking permits to own property in the country. One of our goals was to

    help preserve the natural heritage of the reef for thepeople of Belize, and

    theGlovers Reef Marine Reserve, now a World Heritage Site, would one

    day be the result.

    We sat on blocks of driftwood and hammocks outside a littlebunkhouse under the stations rustic laboratory; Tim and Jacque and Danny

    and I. Sunset on Middle Cay can be a satisfying, mellow time, and this was

    one of those moments. Having discussed sea urchins and missing herbivores

    with Tim until I was sure he was fed up, I took the chance to clarify

    something with Danny. I asked him if Belizeans ate parrotfish.

    Not so much, you know, he said.

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    Thats what I thought, I said. Tim works in Mombassa, and in

    Mombassa, the people have eaten the parrotfish, and that helped wreck the

    reefs of Kenya.

    It can be, Danny said, a little enigmatically.

    Tim thinks that the sea urchin is not the only algae eater missing

    from Glover's. He thinks something like a parrotfish or a surgeonfish --- an

    herbivore --- must be missing, too.

    Yes man, it can be, Danny said again, drinking of the spiced rum,

    something sly working into his narrow face. I began to think he was up to

    one of his verbal ploys.

    But Ive never seen anyone catch a parrotfish here, I protested.

    You just said Belizeans dont eat the damn things. Theyre probably

    poisonous, anyhow.

    No, but Tim is right, you know, Danny said. It is the Midnight blue

    parrotfish that is missing.I stared at Danny in the waning light. He stared back, his hazel eyes

    steady; no mirth to be seen. I felt a surge of adrenalin.

    Whadaya mean? I asked.

    I had a faint memory of seeing the handsome, dark-bodied midnight

    blues, with their lighter faces, in the Bahamas, grazing in and around coral

    heads.

    Danny Wesby said, I caught them all. My friend and I, we caught all

    the midnight blue parrotfish. There are none left. They never came back to

    Glover's Reef.

    I was stunned, but intensely curious.

    How in hell did you do that? I asked. I was certain Danny would

    not have used poison or dynamite.

    No problem, man. The school of midnight blues always has a

    sentinel; a guard fish. Where the guard fish goes, the whole school goes.

    Thats how we caught them.

    Danny chuckled at the recollection.

    The guard fish, he gonna head for a safe place, a cut in the reef. If he

    get through the cut, he can hide in deep water. You see? So what we do, we

    put the net right there. Right across the cut. Then we spook the guard fish.Where the guard fish go, the whole school goes. We catch the whole school,

    man.

    Tim, are you hearing this? I called out.

    Tim and Jacque were talking in the growing gloom of evening.

    Hearing the excitement in my voice, they ambled over closer to Danny and

    me. I had Danny review the story of the midnight blue. Apparently, over a

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    season or two, he and his friend had continued using the fishes escape

    behavior against them. They worked across all of the 75 square miles of the

    expanse of the atoll, catching parrotfish, a school at a time.

    Holy smokes, I said. But what did you do with them? Are you

    telling me you sold parrotfish to Belizeans?

    No, man, Danny said, with a touch of derision. To the

    Guatemalans. They eats them for Lent. The Lenten season. Easter time.

    Oh, yes, the Catholics. I remembered now. I had studied fish on Lake

    Izabal, in Guatemala. I had seen the racks of drying, salted fish. Seco-

    salado, they called it. Dry and salted. Bails and bails of it were prepared,

    bundled up, tossed onto the roof racks of rickety buses, and hauled off to the

    cities of the interior. Seco-salado. I remembered lots of flies crawling

    across the briny fillets as they steamed dry in the tropical sun. In this way,

    they were stripping the stocks of snook from Lake Izabal.

    So Danny had linked into the insatiable, if seasonal, market for dryfish in neighboring Guatemala. He had captured the midnight blue

    parrotfish, cleaned them, dried them in the sun, probably right there on

    Middle Cay, long, long ago, and hauled the redolent cargo down to

    Livingston for sale to the needy Catholics.

    Well, Tim, I said, toasting him with the rum, I told you Belizeans

    didnt eat parrotfish.

    My reverie about the midnight blues was checked as Miguel angled

    the boat away from an approaching patch of mangroves; an incipient little

    key being formed by the tangled roots of the mangroves themselves. We

    were cruising over very shallow water. In fact, only a little closer in to

    Ambergris, where the water was knee deep, were famous bonefish flats.

    Anglers with fly rods could wade, or be poled about by sharp-eyed guides in

    shallow-draft skiffs, looking for, and casting to, the exposed tail fins of

    mudding bonefish; one of the greatest game fish in the world.

    As for the midnight blue parrotfish, we on the staff of WCS have a

    tentative plan. It might work, if we can get the money, of course. The

    species can still be found on the main barrier reef. We think juvenile fish

    can be captured, and transported to Glover's Reef for release. Translocation.

    Restoration. We are hopeful.But, I reminded myself, suppose we do restore the herbivorous

    parrotfish, and suppose fishing bans do allow the predatory groupers to

    bounce back, there is still El Nio, the Christ Child. It is a bad name: no

    good comes of this nio. The event bears that name only because, to

    Peruvian anchovy fishermen, the warm water and the bad times come at

    Christmas, every few years. El Nio has to do with rising water

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    temperatures at equatorial latitudes. It is the genesis of a thermal engine that

    spins off foul weather across the planet, and alters marine currents the size

    of the Mississippi. The thermal map of entire ocean basins is redrawn, and

    habitats and biological communities accustomed to a cool-water ambiance

    are suddenly flooded with warm water. It only takes an increase of a few

    degrees, as few as 4 degrees, to wreak havoc among many types of marine

    organisms.

    When El Nio water temperatures strike Belize, it is traumatic for the

    little coral polyps of the reef. They respond to the abrupt leap in temperature

    by expelling the symbiotic plants, the algae, which live within their tissues.

    The algae, or zooxanthellae, normally produce carbohydrates through

    photosynthesis. The polyp happily accepts this food, and provides its waste

    products to the plant in exchange. The zooxanthellae carry out other duties

    as well for the curious little duplex, and they provide color. It is the

    chlorophyll in the zooxanthellae that contains the pigments that give thecorals their reddish, brownish and greenish tones. Once the polyp casts out

    the symbionts, the corals -- a single head, or an entire reef -- turn bone

    white. This is known as bleaching, and it is usually the precursor to death of

    the coral polyps. They can live for awhile, but if they are unable to recover

    their zooxanthellae, they will die.

    In 1995 there was a bad El Nio event, and in 1998, there was another

    one, even worse. Marine scientists monitored what one writer called a

    wave of heat spreading from the Peruvian coast, westward across the

    Pacific and Indian Oceans. It was devastating to coral reefs right across the

    IndoPacific. No one had ever seen anything like it. Eventually, the heat

    wave worked its way into the Caribbean. In Belize WCS staff, along with

    other workers up and down the coast, witnessed the terrible ghosting of the

    great formation offshore.

    Like most people, I suppose, I had only become aware of the El Nio

    phenomenon in what I consider to be the last few years; during the last

    decade, perhaps? The last two decades? I have studied marine science all

    my life at various levels of intensity, but El Nio doesnt appear in my

    recollections until fairly recently. Maybe that is another indication of the

    newness or immaturity of marine biology, generally.Or maybe it is something else. Maybe El Nio, as the world has

    experienced it recently, really is new. I asked Tim MacClanahan about this

    once, out at Glover's Reef. There seemed to be suggestions in the scientific

    journals that El Nio events had occurred every few years for centuries; for

    eons, even.

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    Yes, Tim said, his face becoming thoughtful. We took core

    samples in coral rock around Mombassa.

    You did? I said, incredulous. "I thought you were a fish man." Tim

    had become something of a one-man college of marine science.

    Well, we have to make-do sometimes. So I did some geology and,

    yes, in the cores of limestone, you can see the signs of these El Nio blights

    very regularly, right on back through time

    But was it this bad? I asked, waving my arm out toward the

    perimeter of Glover's Reef. Its hard to believe corals could recover from

    this kind of devastation every 4 or 5 years.

    Nope. Its worse now; worse than its ever been, Tim said.

    Why? I asked.

    Global warming, he answered, without hesitation.

    The El Nio-spawned waves of warm water that periodically sloshed,

    unwanted, into cool-water habitats, caused their share of damage in timespast. Analyzing core samples like those Tim had collected showed that

    some corals in a given reef system were killed outright during these events,

    and, almost certainly the entire reef had suffered stress. But, in those days

    the consequences of El Nio were more like an interruption, a hiccup, in the

    exuberant life of the reef. The trauma was always tolerable, in the long

    term. On the whole, the organisms were able to protect themselves from the

    thermal assaults, and recover from them. The reef community was adapted

    to occasional, moderate, thermal blasts.

    However, today, as Tim explained it, with the ocean temperature

    already elevated by human-induced greenhouse effects, the increment added

    by El Nio waters is beyond the evolutionary experience of the coral

    organisms. The polyps cast out their algal partners and die, turning eerily

    white. The peaks in temperature, occurring about every 4 years, are much

    higher than in ancient times; El Nio effects are additive, and the threshold

    of tolerance to thermal stress is being exceeded among reefs throughout the

    world.

    My glossy blue and white boat was slowing as Miguel sought the

    mangrove channel that would take us across Ambergris Cay, into Bacalar

    Chico National Park and Marine Reserve. We were getting close to therarest place on earth.

    The park was a good sample of coastal land and sea. Our boat cruised

    through mangrove channels that opened into broad, very quiet lagoons. The

    park service had set out stakes as markers to help navigate through the maze.

    Tarpon rolled in the still water, their silver backs seeming very broad in the

    confined waters of the channels. Bordering the wetlands I glimpsed patches

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    of a low, bushy forest; a plant community of tough, hearty species, able to

    survive on sandy soil, and be regularly assailed by tropical storms. Back in

    1991, the year Janet Gibson and I boated up here to advocate in favor of

    declaring a Bacalar Chico National Park, tracks of interesting game could be

    found at this end of Ambergris Cay: jaguar, puma, peccaries, deer. But, the

    oceanside of Ambergris was becoming developed quickly, and I didnt know

    if the wildlife was holding on. I would have to ask the wardens.

    Bacalar Chico, the park, also included a section of the barrier reef, and

    it was possible to reach it by boat. The channel we were in led to the sea; it

    was a man-made cut, dug by the Maya. Its purpose had been to facilitate the

    passage of trade goods coming by large, sea-going canoes down the coast of

    the Yucatan and destined for the interior, perhaps for the great city of Tikal.

    It was an interesting place, and this morning, it was free of people. As

    we drifted into a little dock adorned with a park service sign, I enjoyed a

    healthy sense of frontier, of wilderness. The only sounds, as Miguel cut theengine, were the soft slush of the low surf on the reef, offshore, and a faint

    slapping of a palm leaf striking another in the light breeze. At the moment,

    not even birds were calling. There were neat little clouds in the sky. The air

    was cool under the seagrape tree leaning over the dock. The seawater,

    beyond the opening of the Maya canal, was Santa Fe turquoise; an almost

    artificial tone. I never get used to it; I never tire of it.

    Wilderness, if its a Caribbean shore, makes me sort of... nutty. It is

    never daunting, as wilderness sometimes can be, but splendid and inviting. I

    was in Bermuda, once, and encountered an unusual metaphor for what Im

    talking about. As I was leaving a hotel, going through the glass doors for the

    outside, a small car swung up to the stoop to discharge a passenger. A large,

    brown-skinned man unfolded himself from the automobile, stood, and for a

    moment, faced in my direction, waving at someone he knew behind me. He

    had on glossy, light-brown shoes, navy blue socks that reached his knees,

    Bermuda shorts, chartreuse in color, and a sky-blue button-down Oxford

    shirt. His smile was broad and brilliant white. The apples of his cheeks

    gleamed. And his head was crowned with pure white, tightly curled hair,

    like a cloud at noon-time. It suddenly dawned on me that the hearty, clashy

    colors, and the warm, embracing demeanor of the man, reminded me of aCaribbean shore. Thats what its like: mellow and sublime.

    A slim young woman in uniform came onto the dock. She had

    appeared from a small building that I took to be a park field station. Her

    badges and embroidered names and emblems confirmed her as an officer of

    the Fisheries Department, serving as a park ranger at Bacalar Chico. We

    clambered onto the dock to say hello, and talk. She said one of her two

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    partners, men I gathered, was out on a morning patrol. The other was

    watching over a construction gang building a new park headquarters, the San

    Juan Station. The new structure was sponsored by the Mesoamerican

    Barrier Reef System project, or MBRS. The MBRS enjoyed the financial

    support of the Global Environmental Facility, and was the most promising

    regional conservation initiative in history to come to the aid of the reefs of

    Mexico, Belize, Guatemala and Honduras.

    As we chatted with the park ranger on her dock, we learned she had

    an unusual assignment. The park service staff were the only governmental

    personnel stationed up here where the borders of Mexico and Belize were

    joined. What a park warden might witness in a place like this might not be

    covered in conventional park management manuals. The most worrisome

    incident, because it was so dangerous, was drug trafficking. The second

    spookiest waspeople trafficking: coyotes guiding small gangs of desperate

    Hondurans or Salvadorans into Mexico and on to the assumed opportunitiesof the North. The Bacalar Chico staff had protocols prepared to handle, in

    non-confrontational ways, these oddball exigencies.

    We learned, however, that the most recent event to alarm the park

    rangers had not been an encounter with contrabandistas, but with carnage in

    the sea. Some weeks before, dead fish and sea turtles had come floating, all

    bloated and stinking, down from Mexico into the waters of Bacalar Chico.

    The staff made inquiries, and learned that the Mexicans had blasted a

    passage through their segment of the barrier reef. They had dynamited a

    channel to allow boat traffic from a resort town to reach the open sea. This

    was done, said the official explanations, to facilitate naval defense of the

    Yucatan coast. The Belizeans figured it was to allow new business with

    cruise ships.

    I leaned toward the Belizean point of view.

    Miguel had broken out cold drinks from the cooler, but before he got

    too comfortable with the ranger and the salubrious surroundings, I had him

    run me the short way down to the rarest place on earth, Rocky Point, where I

    waded ashore with a canvas bag of snorkeling gear. Miguel would dash

    back after 30 minutes.

    I chose Rocky Point as a place to reconnoiter for reef health because itnot only represented a segment of the Belize Barrier Reef, but it touched the

    land. At Rocky Point, you could practically leap from shore to the verge of

    a continental shelf; from the edge of a dry forest to the wall of a barrier reef.

    To the north and south of this spot, the reef drew away from the mainland.

    Down at Sapadillo Cays, the southern tip of the reef in Belizean waters, the

    reef was 40 miles out from the beach. Here at Rocky Point, a headland

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    derived from an uplifted fossil reef, the dry land was perched almost on top

    of the coral reef, and would cast shadows upon it during a late afternoon.

    It is not that Rocky Point is so unusual, ecologically. From what I can

    tell, being so close to shore doesn't make for unique biological patterns

    beneath the water. There is no pollution, no unusual sedimentation ---

    because it's a park. It is mainly that Rocky Point is the site of this curious

    geomorphological situation: no barrier reef in the world does the same

    thing. Most remain purposefully offshore, breastworks against typhoons and

    high seas.

    So, there is the geology of the place; and there is, for some people, a

    more whimsical aspect to Rocky Point. To be able to jump from one biome

    into another --- kiscadee flycatchers squawking one second, stoplight

    parrotfish scuttling away, the next--- is a fine experience for a naturalist.

    Having the transition punctuated by the splash of the dive is a dandy bonus.

    Air to water; birds to fish: a happy evolution, wrapped in a shroud ofbubbles.

    I donned my bathing suit and diving gear, and waded out. In fact, you

    can't really jump to the edge of the reef. There is a narrow apron of sand and

    coral rubble to cross. I lay out on the water and began to kick my flippers,

    sucking in my gut to get over the sharp corals, and slid into the deep water

    beyond the forereef; the wall that faced the sea and waves and currents.

    Then I settled down, crossed my hands over my back, and slowly kicked

    back up the reef, watching the craggy scene below. It is a bit like watching

    Manhattan from the porthole of an airliner descending into LaGuardia

    airport: A three dimensional colony of fixed and moving figures slides by,

    teasing you with sights whose meaning you cannot resolve before you have

    moved on to another, tantalizing, situation.

    The signs of bleaching were everywhere. My eye, perhaps my soul,

    sought to dwell on the living structures down there, the 50 percent that was

    still okay; but I was here to bear witness to the morbidity at the rarest place

    on earth. Dead or dying coral is first white, as I have said; a very pure

    white, with a brilliance to it; and it is indeed exactly like coral cleaned with

    chlorine bleach for sale at the trinket shops on the interstates. It crossed my

    mind that the corals die beautifully. With the tissues of the polyps gone, theintricate structures of the underlying, deposited, stone are visible, the

    calcium carbonate matrix that the corals and their helpers, the zooxanthellae,

    have worked to lay down over years; decades. It is beautiful, but chilling. It

    is a forbidden sight, these skeletons. Only dead corals can reveal this pearly

    infrastructure.

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    But, after a time, without the energetic work of the polyps, the dead,

    quiet stones take on a dirty appearance. Silt settles on the branches and

    boulders of the coral, taking the reflectivity out of the scene, and actually

    dulling the sharper edges with layers of mud. The light goes out of a dead

    reef, even though the physical relief may persist.

    There were fish still there, in considerable numbers. The changes in

    the composition of the fish community would probably be subtle and gradual

    if the reef continued to die. For many of the species, the structure itself was

    what was important. The hidey-holes and tunnels and shelves of rock.

    Shelter from predators; concealing ambuscades; nursery cubicles --- so long

    as the fortifications remained, it didn't matter if the coral polyps were alive.

    Until the rock itself was turned to sand.

    On a sandy bank, out from a spur of coral rock, a Spanish hogfish was

    working; patiently probing the sand with his peculiar telescopic jaws. The

    three stringy pennants of his dorsal fin rose when the fish rolled an eye up atme, but he kept on working. A blue headed wrasse was out there with him,

    zooming around the larger fish, looking for a freebie morsel, playing the

    Jack Russell terrier to the hogfish's phlegmatic basset hound. The hogfish

    was perhaps 15 inches long; a youngster, still growing, but ideal for a baking

    dish. It was a good sign because among Belizeans, as among most

    experienced consumers of Caribbean fish, the hogfish is the most delectable

    of all. They are notably passive fish, easily speared, and are quickly

    removed from the coral reef habitat if spear fishing is permitted. I took this

    fish's appearance as evidence that the Bacalar Chico park was working. The

    hogfish, and, presumably the snappers and groupers, had a refuge here from

    the incessant pressure of commercial fisherman.

    I saw a barracuda hovering over a large, solitary brain coral, and I

    swam toward it. The barracuda receded as I approached, but kept me within

    his severe gaze. The big brain, maybe 10 feet across the middle, was

    showing some disease on top, as though scalped with a giants knife, but at

    least 2/3 of it was glowing a soft, healthy green. I took a breath and dove

    down its side, reaching for the sandy bottom. I grabbed a big chunk of loose

    limestone to help me stay down for a moment, and glanced under the shelves

    at the base of the brain coral, hoping to see wavy tell-tales; the antennae of aspiny lobster.

    What I saw instead made me choke on my snorkel in excitement.

    Hanging upside down, I kicked harder to get my nose down again to peer

    under the shelf. There were at least 25 black sea urchins under there; little

    ones, golf-ball sized...babies! Somewhere, upstream, up current, an adult

    male and female urchin had found one another at the right time, on the right

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    moon, and had had reproductive success, releasing eggs and sperm into the

    moving water, so that fertilized eggs could be carried into the deep, pelagic

    environment. After a period of weeks, the relatively helpless urchin larvae

    had been cast into the shallows of the reef here in Belize at the precise

    moment when the little ones were ready to "settle out" and survive on a solid

    substrate.

    I wondered, fleetingly, if perhaps that rare, successful pair of adult sea

    urchins, up current, in Mexico, had been sacrificed to the blasted cruise ship

    channel in the barrier reef.

    I didn't dwell on that. Instead, I mutely wished this little band of

    spiny pioneers good luck. Their return to the reef meant that an era, an

    epizootic, of ocean-basin dimensions, was coming to a close. As their

    numbers grew, the urchins, simply by devouring algae, could help restore

    the reef.

    I swung to my left, trying to navigate back toward the big chunk ofrock where I had left my clothing. I approached the reef crest again, and

    poked along looking for a notch wide enough to swim through to the shallow

    lagoon inside. I found a gap in the branches of a large, dead, elkhorn coral

    formation. A golden glow caught my eye, and I stopped my paddling. In

    the shallows here, the swells, low as they were, threatened to shove me into

    the rocks and appendages of the reef. I took hold of a dead, chalky coral

    limb, and studied the bright slab of coral that had beckoned me. A part of

    one of the branches of the old elkhorn itself was still alive. A flattened

    section, about like an English cricket bat, was luminous, golden and clean of

    silt. I looked at the leading edge of the live tissue, and instead of the now-

    common, dreaded, ring of the lethal white-band disease, the edge looked

    healthy. It seemed as though the veneer of coral polyps was expanding; as

    though it might try to recolonize the entire, six-foot branch of old, remaining

    substrate. For some reason, some maddeningly inexplicable reason, this

    little patch of coral polyps was defying the odds, challenging the theories,

    ignoring global warming, and vibrantly seeking to cloak the reef crest in

    living tissue.

    I didn't know if it was possible. I didn't know enough biology. As I

    stood naked in the sun, drying before changing to my traveling clothes, Ithought about the young hogfish, the baby sea urchins and the vigorous

    smear of growing coral. One of my pet, if homely, maxims is: "If you give

    nature a chance, she will work with you." The recovery power of natural

    systems is often awe-inspiring. As a conservationist, I have to cling to that;

    believe in it; count on it! With some active protection from poachers, the

    hogfish and other edible denizens were recolonizing the reef. Owing to God

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    knows what set of circumstances, the sea urchin was recovering from a

    fungal blight, and might soon resume its critical grazing role on the coral

    reef. The bright patch of elkhorn coral, striving away near the rarest place

    on earth, indicated that there might be a strain or strains of coral organisms

    that could tolerate the new thermal regime to which the planet was being

    subjected.

    Or maybe, the ocean warming wasn't as bad as we'd thought...

    Or maybe the current inter-glacial period would come to an end and

    the world would get colder, overwhelming the acts of man, cooling the seas,

    saving the reefs, just in time. Maybe hell would freeze over, in a manner of

    speaking.

    I gazed out over the reef crest to the horizon. I tried to visualize the

    outcome; tried to divine solutions, other things we could try. I thought of

    the strong young organisms I had seen, attempting to reclaim their places on

    the reef. I thought about the magnitude of "global warming," of theenormity of the thermal load already here. When we were kids, if the soup

    was too hot, my mother would say, put in a silver spoon. It would draw out

    the heat. Could we do that for the "ocean planet"? Put in a silver spoon?

    I gazed out there, but this time, I could not see well. In the distance,

    where normally I could find the whole of a thing, where I could pull together

    fragmented thoughts and ideas into a rational architecture, a story, a plan, it

    remained obscure. I could not see through. It looked dangerous.

    It was midnight blue.

    Archie (Chuck) Carr III, PhD

    Senior Conservationist

    Wildlife Conservation Society

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    Sunup, Ambergris Cay, on the Belize barrier reef.