Habitat-Based Assessment of Mf lI b dFihMegafaunal ...
Transcript of Habitat-Based Assessment of Mf lI b dFihMegafaunal ...
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Habitat-Based Assessment of M f l I b d Fi hMegafaunal Invertebrates and Fish on
Cordell Bank, CaliforniaInvertebrates as Living Components of Habitat
Jodi L. Pirtle *1, B.N. Tissot 1, D.A. Roberts 2,3, D. Howard 2
1 Washington State University, Vancouver, 2 NOAA Cordell Bank National Marine Sanctuary, 3 Point Reyes National Seashore
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CollaboratorsCollaborators
Dr Brian N Tissot
Dale Roberts
Dr. Brian N. TissotProgram in Environmental Science Washington State University Vancouver, WA
Dale RobertsNOAA Cordell Bank National Marine Sanctuary Point Reyes National Seashore
D H dDan HowardNOAA Cordell Bank National Marine Sanctuary
Funding Provided by: Point Reyes National Seashore
With thanks to: Dr. Tara Anderson, Linda Snook, Jill Baltan, Mark Amend, Dr. Robert Lea, Dr. Gary Greene, and Dave Slater, Jo Lily, and Ch i Ji f D lt O hi d th f th R/V V l
Funding Provided by: Point Reyes National Seashore
Chris Jiames of Delta Oceanographics, and the crew of the R/V Velero
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Megafaunal InvertebratesMegafaunal Invertebrates
Epibenthic invertebrates larger than 5cm
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ObjectivesObjectives
• Importance of megafaunal invertebrates• Importance of megafaunal invertebrates• Distribution of invertebrates and fish• Cordell Bank communities
• Structure forming• Structure-forming invertebrates and associationsassociations
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Importance ofImportance of Megafaunal Invertebrates
• BiodiversityI t t t t• Important ecosystem components
• Indicate environmental conditions• Potential component of essential
habitat for groundfish?g• Unique and beautiful
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Cordell Bank Marine SanctuaryCordell Bank Marine Sanctuary
USGS Woods Hole
N
N
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Dive Locations• 28 dives• 28 dives
• Variety of depths and bottom typesand bottom types
• 2 or 3 transects (10-15 min each)(10 15 min each)
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MethodsMethodsSubmersible Observations:• Taken off starboard-side• Transect width delineated with lasers ≈ 2 m• Transect width delineated with lasers ≈ 2 m
• Fish identified and measuredVideo Analysis:• Invertebrates identified• Size estimated for large
invertebratesinvertebrates
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Habitat ClassificationHabitat Classification
• Classified on video by single observer• Classified on video by single observer
• Use binary habitat code combination (R B C P G S M)(R, B, C, P, G, S, M)
• Invertebrates and fish countedInvertebrates and fish counted within contiguous habitat “patches”
RR, RB, RS, RM, BR, BB, BC, BS, BM, CB, SR, SB, SS, MR, MB, MM
Habitat Codes:
High Relief Low
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Cordell Bank HabitatsPinnacle
Bedrock Ridgeg
Shallow Rock Reef
Ridge/Large BouldersRidge/Large Boulders
Boulder Field
Boulder/Cobble Field
Consolidated Clay
Sand Sand/G
Mud/Rock Mud/B Mud/C
Unconsolidated Sediment
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Cordell Bank Habitats
Shallow Rock Reef
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Cordell Bank Habitats
Consolidated Clay
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Invertebrate AssessmentInvertebrate Assessment
• 67 taxa from 7 Phyla• 67 taxa from 7 Phyla • 89,000 invertebrates counted• Numerically dominated by -
• Echinoderms: crinoids, brittlestars• Cnidarians: cup coral, anemones, sea pens
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Most Abundant Invertebrate TaxaMost Abundant Invertebrate Taxa
Taxa Sum % Cum %TaxaBalanophyllia elegansFlorometra serratissimaOphiacanthidae
Sum36,01630,22610 745
%413412
Cum %417587Ophiacanthidae
Mediaster aequalisParastichopus spp.Serpulid worms
10,7451,6791,2491,228
12211
87899091p
Unknown anemonesFoliose spongesCeramaster spp.
,1,1391,124964
111
929394
Unknown sand anemonesAllocentrotus fragilisSubsellaflorae sea pens
771573486
<1<1<1
959697
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Most Abundant Invertebrate TaxaMost Abundant Invertebrate Taxa
Taxa Sum % Cum %TaxaBalanophyllia elegansFlorometra serratissimaOphiacanthidae
Sum36,01630,22610 745
%413412
Cum %417587Ophiacanthidae
Mediaster aequalisParastichopus spp.Serpulid worms
10,7451,6791,2491,228
12211
87899091p
Unknown anemonesFoliose spongesCeramaster spp.
,1,1391,124964
111
929394
Unknown sand anemonesAllocentrotus fragilisSubsellaflorae sea pens
771573486
<1<1<1
959697
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Invertebrate-Habitat AssessmentInvertebrate Habitat Assessmente) 3000
Balanophyllia elegans
(#/h
ecta
re
1500
2000
2500
3000
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM
Den
sity
0
500
1000
Bottom TypeRR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM
High Relief Low Relief
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Invertebrate-Habitat AssessmentBalanophyllia elegans
1000
2000
3000 Balanophyllia elegans
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM0
1000
1500are)
Ophiacanthidae
500
1000
1500
ity (#
/hec
ta Ophiacanthidae
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM0
Den
si
40 Subsellaflorae Sea Pens
10
20
30f
Bottom TypeRR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM
0
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Fish-Habitat AssessmentP kfi h
1000
2000
3000 Pygmy rockfish
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM0
1000
are)
Greenspotted rockfish
25
50
75
ity (#
/hec
ta Greenspotted rockfish
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM0
30
Den
si
Stripetail rockfish
10
20
p f
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM0
Bottom Type
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Cordell Bank Communities
RR/DR(cyn/sp)/602/600/ytail/wdo/rosyRR/DR(cyn/sp)/602/600/ytail/wdo/rosy
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Cordell Bank Communities
RR/SRT(sty/cyn/z/sp)/rosy/ytail/byg
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Cordell Bank Communities
MR/R/14/45/stripe/sharp/flatMR/R/14/45/stripe/sharp/flat
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Cordell Bank Communities
BC/R/51/54/20/pygmy/yoy/ling
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Structure-forming InvertebratesStructure forming Invertebrates• Add structure, relief, and complexity to p y
abiotic habitat• Biological component of benthic habitatBiological component of benthic habitat
in continental shelf communities
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Classification CriteriaClassification Criteria
• Large size > 30 cm = 1m
• Complex Morphology =• Complex Morphology =
• Density Aggregations =
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Structure-forming Invertebratesg
TaxaCriteria
Size ComplexMorphology Density
Decreasing sizeMorphology
Shelf sponge X
Barrel sponge X
Foliose sponge X X
size
Foliose sponge X X
Vase sponge X
White-plumed anemone X
Flat sponge X
Sea pen X X
Mound sponge X
Crinoid X X
Round sponge X
Gorgonian X
Brittlestar X
Sea urchin XSea urchin X
Cup coral X
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Sponges of Cordell BankMound
Not pictured -Flat and Vase
Foliose
Flat and Vase
RoundShelf
Barrel
Classification based on morphology
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Sponge Habitat F li
100
150
200 Foliose
25are)
BarrelRR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM
0
50
5101520
ity (#
/hec
ta Barrel
40
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM05
Den
si
Shelf
10
20
30f
RR RB RS RM BR BB BC BS BM CB SR SB SS MR MB MM0
Bottom Type
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Sponge AssociationsSponge Associations
Perching
Perching
ShelterPredator/Prey
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Other AssociationsOther Associations
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ConclusionsConclusions
I t b t d fi h di t ib t d• Invertebrates and fish distributed across distinct habitats
• Co-occur in unique communities• Certain invertebrates may be biological y g
components of habitat• Functional relationship of associationsFunctional relationship of associations
needs to be further investigated
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Where we go from hereWhere we go from here
• Habitat in greater detail and relief analysis• Habitat in greater detail and relief analysis• Percent cover of encrusting species• Examine functional relationship of
associations– Index of activity– Spatial analysis
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