species interactions
DESCRIPTION
2011 version ofTRANSCRIPT
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Species Interactions in Communities
A good look at coevolution at work in our world…
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Types of Interactions(type of impact on each species in parentheses)
• Competition ( - , - )– interspecific vs. intraspecific
• Predation ( + , - )– Carnivory (true) or herbivory– Parasitism, pathogens, parasitoids
• Commensalism ( + , 0 )• Mutualism ( + , + )• Amensalism ( - , 0 )
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The Competitive Exclusion Principle
If two species, with the same niche, coexist in the same ecosystem, then one will be excluded from the community due to intense competition
• both species suffer so ( -, - )• losers usually migrate or die
or • this leads to resource partitioning and species
assume smaller realized niches since they cannot occupy their full fundamental niches
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Visualizing Impacts of Competition
Species B
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Purple Martin & Starling
• Interspecific competition
• Starlings tend to fight off Martins, kill nestlings, and break their eggs
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Red & Grey Squirrels• Interspecific competition• The Grey Squirrel (Sciurus
carolinensis) was introduced to Britain in about 30 sites between 1876 and 1929. It has easily adapted to parks and gardens replacing the red squirrel.
• The Red Squirrel (Sciurus vulgaris) is native to Britain but its population has declined due to competitive exclusion, disease and the disappearance mature conifer forests in lowland Britain.
Grey Squirrel Range
Red Squirrel Range
Maps prepared by the Biological Records Centre, CEH Monks Wood, from records collated by the Mammal Society and others mainly between 1965 and 1993, also including earlier,
published records and a few additions up to 1997.
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Africanized & European HB
• Interspecific competition
• AHB mature faster and are more opportunistic feeders
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Spread of AHB(also good example of a nonnative species)
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Fig. 4-5, p. 68
Louisiana heronwades into waterto seize small fish
Black skimmerseizes small fishat water surface
Ruddy turnstone searches
under shells and pebbles
for small invertebratesAvocet sweeps bill
through mud and surface water in search of small crustaceans, insects, and seeds
Brown pelican dives for fish, which it locates from the air
Dowitcher probesdeeply into mud insearch of snails,marine worms, andsmall crustaceans
Herring gullis a tirelessscavenger
Flamingo feeds onminute organismsin mud
Scaup and other divingducks feed on mollusks,crustaceans, and aquaticvegetation
Piping plover feeds on insects and tiny crustaceans on sandy beachesKnot (sandpiper)
picks up wormsand small crustaceansleft by receding tide
Oystercatcher feeds onclams, mussels, and othershellfish into which itpries its narrow beak
Resource Partitioning
Environmental Science: Problems, Concepts, and Solutions. (12th ed.) by G. Tyler Miller, Jr. and Scott Spoolman
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Fig. 6-4, p. 112
Cape May Warbler
Blakburnian Warbler
Black-throated Green Warbler
Yellow-rumped Warbler
Bay-breasted Warbler
Resource Partitioning
Environmental Science: Problems, Concepts, and Solutions. (12th ed.) by G. Tyler Miller, Jr. and Scott Spoolman
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Impacts of Predation
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Lion & Zebra
• Carnivory predation• Zebra-prey• Lions-predator
* While individual zebras are harmed, the prey population benefits by loss of old and sick members
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Rough-Skinned Newt & Common Garter Snake
• Carnivory predation• Newt-prey
– Has genes to produce potent toxins which discourage predation
• Snake-predator– Has genes for resistance to newt
toxin
• Results in an “evolutionary arms race”… coevolution!*see on YouTube
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Monarch Butterfly & Milkweed
• Herbivory predation• Milkweed-prey (defense)
– Latex: A milky white sap that becomes sticky and coagulates when exposed to air.
– Cardiac glycoside: To various degrees, it is toxic to herbivores with hearts (birds and mammals). Monarchs and several other arthropods that eat milkweed have a tolerance for cardiac glycosides, although evidently not at the high levels found in some milkweed species.
• Butterfly-predator– Monarch larve cut the petiole of the
leaf before beginning to eat it. This "leaf-notching" behavior cuts off the supply of latex.
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Other forms of predation…
• Parasites (endo and ecto)– Live off host, but do not consume large
portion
• Pathogens – Cause disease– Viruses, bacteria, fungi, protists, some
worms
• Parasitoids (endo and ecto)– Lay eggs in or on host & larve consume host
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Remember those EHBs…
• EHB larvae with a parasitic mite on it
• Host = EHB• Parasite = mite• Example of
ectoparasite
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Elk and Liver Fluke
• Parasitism• Elk = host• Fluke = parasite• Example of an
endoparasite
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Liver Fluke Life Cycle
• Many endoparasites may have a cyst form or occupy intermediate hosts that they may not harm…
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Parasitoids
*another example on YouTube
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Commensalism vs. Mutualism
How do you decide?
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Shark & Remora
• Commensalism or mutualism?
• Depends…– If remora gets
transport, protection and scraps and shark nothing ( +, 0 )
– If shark has parasites removed by remora ( +, + )
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Oak & Mycorrhizae Fungi
• Mutualism• Oak tree provides
sugars for fungi• Fungi absorbs
moisture and nutrients for tree
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Lichen (algae & fungus)
• Tricky?• Mutualism (self)• Commensalism
(with living tree)
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Eastern Lamp Mussel & Largemouth Bass
Commensalism: Glochidia (larvae) live on fish gills for about a month…
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Speaking of Eastern Lamp Mussels…
• Carnivory predation by herons
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More on Eastern Lamp Mussels…
• Interspecific competition with Zebra Mussels
• Zebra Mussels are also nonnatives from Europe that arrived in ship’s ballast tanks
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Spread of Zebra Mussels(good example of a accidentally introduced
nonnative species)
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Epiphytes and Trees
• Spanish Moss• Commensalism• Epiphyte roots on
bark and has better access to light and water--no harm to tree
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More Epiphytes…
• A common site on tropical or temperate rain forest trees
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Humans and E. coli Bacteria
• Mutualism• Humans provide
food and shelter (large intestine) for the bacteria
• E. coli assist in human digestion and provide Vitamin K for host
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Quiz Time
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You decide!
Herbivory predation orMutualism?
MUTUALISM!
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You decide!
Easy?
HERBIVORYPREDATION!
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You decide!
A hermit crab with an anemone attached to the shell…
MUTUALISM!
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You decide!
A Tobacco Hornworm covered with wasp pupae…
ECTOPARASITOID!
Adult: Carolina Sphinx Moth
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You decide!
Mistletoe? Not a typical commensal epiphyte, rather a
ECTOPARASITE!
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One More…
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Ammensalism• One species is hurt, but the
other does not benefit ( -, 0 )• No apparent coevolutionary
relationship (one way process)
• Example: As wild pigs forage, they often disturb the upper layer of soil and many organisms may be taken from their burrows and exposed to predation by the action of the pigs, although the harm that the burrowers suffer does not improve the pig's situation at all.
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Black Walnut & Azalea
• Example of alleopathy (not in your text)
• Black Walnut secretes chemical (juglone) that inhibits growth of other plants like azalea
• Could be ammensalism, competition, or avoidance of predation?
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So…species must:
• Adapt (in other words, coevolve due to competition, predation, or develop symbiosis)
• Migrate (run away) or
• Die (go extinct)