you are where you eat: correlating spatial habitat use and ... · r package version 2.0.6 ....
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Youarewhereyoueat:CorrelatingspatialhabitatuseanddietarypreferenceinthePacificharborsealSheannaSteingass1,MarkusHorning1,2,AmyBishop2,LorrieRea3
1:OregonStateUniversityMarineMammalInstitute,NewportOR(USA)2:AlaskaSeaLifeCenter,SewardAK(USA)3:UniversityofAlaskaFairbanks,FairbanksAK(USA)
TEXASTEXAS
MONTANAMONTANA
UTAHUTAH
IDAHOIDAHO
NEVADANEVADA
CALIFORNIACALIFORNIA
OREGONOREGON
ARIZONAARIZONA
IOWAIOWA
WYOMINGWYOMING
KANSASKANSASCOLORADOCOLORADO
NEW MEXICONEW MEXICO
OHIOOHIO
MINNESOTAMINNESOTA
NEBRASKANEBRASKA
MISSOURIMISSOURI
ILLINOISILLINOIS
GEORGIAGEORGIA
OKLAHOMAOKLAHOMA
WASHINGTONWASHINGTON
MAINEMAINE
SOUTH DAKOTASOUTH DAKOTA WISCONSINWISCONSIN
NORTH DAKOTANORTH DAKOTA
ALABAMAALABAMA
NEW YORKNEW YORK
ARKANSASARKANSAS
INDIANAINDIANA
MICHIGANMICHIGAN
VIRGINIAVIRGINIA
LOUISIANALOUISIANA
MISSISSIPPIMISSISSIPPI
KENTUCKYKENTUCKY
TENNESSEETENNESSEE
PENNSYLVANIAPENNSYLVANIA
NORTH CAROLINANORTH CAROLINA
Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMap contributors, and the GIS user community
SignificantFactorsofClusterAnalysis:Isotopesvs.Bathy./Lithography
ClusterMeanδ13C MUD ROCK SAND
%50mIsobath
%150mIsobath
“Inshore” -14.04 0.66 1.81 48.49 85.29 0.93“Offshore” -14.63 20.78 14.92 62.72 58.83 13.69
p-value 0.00692 0.0072 5.25e-2 0.04418 2.28e-7 0.05533
IntroductionPacificharborseals(Phoca vitulina richardii)areacommonbutunderstudiedmarinemammalontheOregoncoast.Weconductedthefirstcomprehensivesatellitetelemetryandisotopicstudyofharborseals
ontheOregoncoast todetermineareasofimportance,andtoinvestigatewhetherhabitatuse
correlateswithisotopiccomposition..
TelemetryandIsotopeAnalysisWildlifeComputersSPOT5©satellitetagswere
attachedto24adultsealscapturedintwolocationsontheOregoncoast,USA.
Onewhiskerfromeachanimalwascollectedandsectionedevery0.5cmThefirst10sampleswere
analyzedforstableisotopesδ13Candδ15N.Telemetrydatawasprocessed(Rpackages‘crawl’&‘fixpath’)togenerateregularizedtracklineswitha1:1ratioofactualat-sealocations (n=57,220).
ClusterAnalysis(Below)Twosetsofhierarchical clusteranalyses
(Ward’smethod;Rpackage‘cluster’)wereusedtodeterminethelevelofcorrelationbetweenspatialbehaviorsandisotopic
ratiosofδ13Candδ15N,andtodistinguishpotentialforaginggroups.
ResultsTelemetrydatailluminatedextensive,diverseandnearly-exclusive utilizationofthecontinentalshelf.Meanδ13Cwassignificantlydifferentbetween
clustersinbothsetsofanalyses.ThisstudyidentifieddistinctforaginggroupsforsealsinOregon,anddemonstratedδ13Casapotentiallypredictivefactorofspatialforaging
characteristicsontheOregoncoast.
Acknowledgements
Allworkconductedunder:NOAAMMPAPermit#16991/OSU/SanJoseStateIACUC
Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMapcontributors, and the GIS user community
Legend
Localized Foragers - Netarts
Localized Foragers - Alsea
Far-Ranging Foragers - Alsea
Far-Ranging Foragers - Netarts
Alsea Bay
Netarts Bay
Columbia River
0 25 5012.5 Kilometers
DevinS.Johnson(2017).crawl:FitContinuous-TimeCorrelatedRandomWalkModelstoAnimalMovementData.Rpackageversion2.1.1.Maechler,M.,Rousseeuw,P.,Struyf,A.,Hubert,M.,Hornik,K.(2017).Cluster:ClusterAnalysisBasicsandExtensions.Rpackageversion2.0.6.Funding forthisprojectprovidedby:NorthPacificResearchBoardGraduateStudentAward,ARCS OregonScholarAward,TheOregonCommunityFoundationSaltyDogFund,HMSCMamieMarkhamMemorialScholarshipandHoltEducationAward,andtheODFWMarineReservesScholarship.Thankyoutothe2014and2015captureteams!
CorrelatingIsotopes+Telemetry
LithographyoftheStudyRegion BathymetryoftheStudyRegion
SignificantFactorsofClusterAnalysis:Isotopesvs.SpatialUse
ClusterMeankmfromShore
Meanδ13C MeanLat. RangeLat
RangeLong
HomeRange (km2)
“Ranging” 9.53 -14.71 -124.17 0.77 0.791 671.63“Localized” 1.87 -13.74 -124.04 0.28 0.27 145.06
p-value 0.00493 0.0003 0.01367 3.77e-8 0.02539 0.00343
Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMapcontributors, and the GIS user community
Inshore - Netarts
Offshore - Alsea
Inshore - Alsea
Alsea Bay
Netarts Bay
Columbia River
Legend
0 25 5012.5 Kilometers
*SpatialHabitatUse
Bathymetry/Lithography
Hierarchicalclustergroupsbyspatialhabitatuse
Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMapcontributors, and the GIS user community
ROCK
MUD
SAND
Alsea Bay
Netarts Bay
Columbia River
Legend
0 25 5012.5 Kilometers
O R E G O N
WA S H I N G T O N
Esri, DeLorme, GEBCO, NOAA NGDC, and other contributors,Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMapcontributors, and the GIS user community
Legend
Alsea Bay Seals
Netarts Bay Seals
Capture Site:Netarts Bay
Capture Site:Alsea Bay
Columbia River
0 25 5012.5 KilometersEsri, HERE, DeLorme, MapmyIndia, © OpenStreetMapcontributors, and the GIS user community
Columbia River
Legend50m100m150m200m
0 25 5012.5 Kilometers
Netarts Bay
Alsea Bay
95%UD(HomeRange)forallanimals
StudyRegion
Contact:tinyurl.com/sealscientist |[email protected]
HierarchicalclustergroupsbygeographicvariablesNMFSMMPAPermit#16991
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