marine life protection act initiativedfg.ca.gov/mlpa/pdfs/agenda_040109g1.pdf · 2013. 6. 11. · 0...

Marine Birds Evaluation for the MLPA South Coast Study Region

Dan Robinette, MLPA Master Plan Science Advisory Team

Presentation to the Master Plan Science Advisory TeamApril 1, 2009 • Los Angeles, CA

Marine Life Protection Act Initiative

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Methods Overview

• Benefits to Marine Birds– Direct: Decreased disturbance at breeding, resting and

foraging sites– Indirect: Protection of prey populations

• Five Analyses– Protection of seabird breeding colonies– Protection of seabird roost sites– Protection of near-colony foraging areas– Protection of neritic foraging ‘hot spots’– Protection of estuarine and coastal habitat

• Round 1 analyses considered only state marine reserves (SMRs)

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Seabird Breeding Colonies

0

20

40

60

80

100

18 Spp(59,018)

ASSP(1,274*)

BLOY(97)

BRCO(5,922*)

BRPE(2,690)

LETE(2,049*)

PECO(430)

PIGU(1,179)

XAMU(5,150*)

% o

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Cal

Pop

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W IslandsM IslandsE IslandsS MainlandN Mainland

Distribution of Total Seabird Population and SLTB (values in parentheses indicate population estimates)

• These population estimates will be updated prior to the Round 2 analysisSLTB =

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Seabird Breeding Colonies

Protection of all Breeding Seabird Colonies

0

50

100

150

200

250

300

350

400

450

500

Prop 0 Lap A Lap B Opl A Opl B Top A Top B Ext A Ext B Ext C

% o

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W IslandsM IslandsE IslandsS MainlandN Mainland

Prop = Proposal Lap = Lapis Opl = Opal Top = Topaz Ext = External

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Percent of Bioregion Breeding Population

D100 %90.9 %29.0 %36.8 %Ext CN0 %0 %29.0 %36.8 %Ext BU0 %0 %29.0 %36.8 %Ext AO100 %0 %29.0 %36.8 %Top BR100 %9.1 %29.0 %36.8 % Top A

100 %0 %29.0 %36.8 %Opl BT0 %0 %29.0 %36.8 %Opl AX100 %0 %29.0 %36.8 %Lap BE0 %0 %29.0 %36.8 %Lap AN0 %0 %29.0 %36.8 %Prop 0

N MainlandS MainlandEast IslandsMid IslandsWest Islands

SLTB: Brandt’s Cormorant


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100 %66.7 %33.3 %13.3 %Ext C0 %0 %33.3 %13.3 %Ext B0 %0 %33.3 %13.3 %Ext A

100 %0 %33.3 %13.3 %Top B100 %33.3 % 33.3 %13.3 %Top A

0 %0 %33.3 %13.3 %Opl B0 %0 %33.3 %13.3 %Opl A0 %0 %33.3 %13.3 %Lap B0 %0 %33.3 %13.3 %Lap A0 %0 %36.1 %13.3 %Prop 0

N MainlandEast IslandsMid IslandsWest Islands

SLTB: Black Oystercatcher


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100 %6.5 %66.3 %Ext C0 %6.5 %66.3 %Ext B0 %6.5 %66.3 %Ext A

100 %6.5 %66.3 %Top B100 %6.5 %66.3 %Top A

0 %6.5 %66.3 %Opl B0 %6.5 %66.3 %Opl A0 %6.5 %66.3 %Lap B0 %6.5 %66.3 %Lap A0 %6.5 %66.3 %Prop 0

N MainlandMid IslandsWest Islands

100 %13.6 %55.4 %0 %13.6 %55.4 %0 %13.6 %55.4 %

100 %13.6 %55.4 %100 %13.6 %55.4 %

0 %13.6 %55.4 %0 %13.6 %55.4 %0 %13.6 %55.4 %0 %13.6 %55.4 %0 %13.6 %55.4 %

N MainlandMid IslandsWest Islands

SLTB: Pelagic Cormorant SLTB: Pigeon Guillemot


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39.3 % 26.1 %Ext C0 %0 %Ext B0 %0 %Ext A0 %2.0 %Top B0 %6.5 %Top A0 %5.3 %Opl B0 %2.0 %Opl A

39.3 %12.9 %Lap B0 %0 %Lap A0 %0 %Prop 0

N MainlandS Mainland

93.5 %93.5 %93.5 %93.5 %93.5 %93.5 %93.5 %93.5 %93.5 %93.5 %

Mid Islands

SLTB: Least TernSLTB: Brown

Pelican


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D11.3 %75.0 %Ext CN11.3 %75.0 %Ext BU11.3 %75.0 %Ext AO11.3 %75.0 %Top BR11.3 %75.0 %Top A

11.3 %75.0 %Opl BT11.3 %75.0 %Opl AX11.3 %75.0 %Lap BE11.3 %75.0 %Lap AN11.3 %75.0 %Prop 0

East IslandsMid IslandsWest Islands

D0.1 %100 %N0.1 %100 %U0.1 %100 %O0.1 %100 %R0.1 %100 %

0.1 %100 %T0.1 %100 %X0.1 %100 %E0.1 %100 %N0.1 %100 %

East IslandsMid IslandsWest Islands

SLTB: Ashy Storm-Petrel SLTB: Xantus’s Murrelet


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Seabird Roost Sites

• Focused on brown pelicans

• Currently have data only for mainland sites

• Classified sites by level of importance

– High: >500 birds– Medium: 100 – 500

birds– Low: never >100

birds

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Mainland RoostsNorth Mainland

South Mainland

02468

1012


Num

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sts

HighMediumLow

02468

1012


Num

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HighMediumLow

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Near-Colony Foraging Areas

• Focused on five species: Brandt’s cormorant, pelagic cormorant, pigeon guillemot, least tern, and bald eagle

• Calculated Foraging Index (FSMR) for protection within SMRsFSMR = • pi x fi

where pi = colony population and fi = amount of foraging area within SMR

• Compared FSMR to Maximum Foraging Index calculated as if study region was all one SMR

Fmax = • pi x fi

where pi = colony population and fi = amount of foraging area within study region

• Figures show percent of maximum potential foraging area protected under each array

FSMR / Fmax x 100

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Near-Colony Foraging AreasBrandt’s Cormorant

Pelagic Cormorant

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% o

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For

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S MainlandE IslandsM IslandsW Islands

02468

101214161820


% o

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N MainlandM IslandsW Islands

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Near-Colony Foraging AreasPigeon Guillemot

Least Tern

0

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% o

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N MainlandM IslandsW Islands

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% o

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S MainlandN Mainland

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Estuarine and Coastal Habitat

• Goal was to evaluate protection areas used by waterfowl, marsh birds and shorebirds

• Audubon Christmas Bird Count data did not provide adequate coverage of study region

• Focused on habitat protection instead– Analyzed amount of estuarine habitat protected– Analyzed amount of coastal marsh, tidal flat and

beach habitat protected

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020406080

100120140160180200


% o

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Estuaries

Coastal Marshes

020406080

100120140160180200


% o

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Tidal Flats

Beaches

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% o

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S MainlandN MainlandE IslandsM IslandsW Islands

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Summary

• Seabird Breeding Colonies– External C provides the most protection in all

bioregions– Lapis B and Topaz A provide more protection within

mainland bioregions– All other arrays similar to Proposal 0 (existing MPAs)

• Seabird Roost Sites– Lapis A, Topaz A and Topaz B provide greatest

protection for north mainland bioregion– Lapis B, Opal B and Topaz A provide greatest

protection for south mainland bioregion

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Summary

• Near-Colony Foraging Areas– Brandt’s cormorant and pelagic cormorant receive

most protection from proposed arrays– Most protection occurs within mainland bioregions.– Lapis B, Opal B and External C provide greatest

protection for Brandt’s Cormorant– Topaz B provides greatest protection for pelagic

cormorant• Estuarine and Coastal Habitats

– Estuaries and coastal marshes receive the most protection

– Lapis B and External C provide the most protection of these habitats

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For SAT DiscussionAt-Sea Seabird Densities

Brandt’s Cormorant

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marine life protection act initiativedfg.ca.gov/mlpa/pdfs/agenda_040109g1.pdf · 2013. 6. 11. · 0...

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