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

Packet Pg. 230

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)

Packet Pg. 231

Seabird Breeding Colonies

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*)

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 =

Packet Pg. 232

Seabird Breeding Colonies

Protection of all Breeding Seabird Colonies

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

W IslandsM IslandsE IslandsS MainlandN Mainland

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

Packet Pg. 233

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

Packet Pg. 234

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

Packet Pg. 235

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

Packet Pg. 236

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

Packet Pg. 237

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

Packet Pg. 238

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

Packet Pg. 239

Mainland RoostsNorth Mainland

South Mainland

HighMediumLow

Packet Pg. 240

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

Packet Pg. 241

Near-Colony Foraging AreasBrandt’s Cormorant

Pelagic Cormorant

S MainlandE IslandsM IslandsW Islands

101214161820

N MainlandM IslandsW Islands

Packet Pg. 242

Near-Colony Foraging AreasPigeon Guillemot

Least Tern

N MainlandM IslandsW Islands

S MainlandN Mainland

Packet Pg. 243

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

Packet Pg. 244

020406080

100120140160180200

Estuaries

Coastal Marshes

020406080

100120140160180200

Packet Pg. 245

S MainlandN MainlandE Islands

Tidal Flats

Beaches

S MainlandN MainlandE IslandsM IslandsW Islands

Packet Pg. 246

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

Packet Pg. 247

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

Packet Pg. 248

For SAT DiscussionAt-Sea Seabird Densities

Brandt’s Cormorant

Packet Pg. 249

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

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