You are where you eat: Correlating spatial habitat use and ... · R package version 2.0.6 ....
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You are where you eat: Correlating spatial habitat use and dietary preference in the Pacific harbor seal Sheanna Steingass 1 , Markus Horning 1,2 , Amy Bishop 2 , Lorrie Rea 3 1: Oregon State University Marine Mammal Institute, Newport OR (USA) 2: Alaska SeaLife Center, Seward AK (USA) 3: University of Alaska Fairbanks, Fairbanks AK (USA) TEXAS TEXAS MONTANA MONTANA UTAH UTAH IDAHO IDAHO NEVADA NEVADA CALIFORNIA CALIFORNIA OREGON OREGON ARIZONA ARIZONA IOWA IOWA WYOMING WYOMING KANSAS KANSAS COLORADO COLORADO NEW MEXICO NEW MEXICO OHIO OHIO MINNESOTA MINNESOTA NEBRASKA NEBRASKA MISSOURI MISSOURI ILLINOIS ILLINOIS GEORGIA GEORGIA OKLAHOMA OKLAHOMA WASHINGTON WASHINGTON MAINE MAINE SOUTH DAKOTA SOUTH DAKOTA WISCONSIN WISCONSIN NORTH DAKOTA NORTH DAKOTA ALABAMA ALABAMA NEW YORK NEW YORK ARKANSAS ARKANSAS INDIANA INDIANA MICHIGAN MICHIGAN VIRGINIA VIRGINIA LOUISIANA LOUISIANA MISSISSIPPI MISSISSIPPI KENTUCKY KENTUCKY TENNESSEE TENNESSEE PENNSYLVANIA PENNSYLVANIA NORTH CAROLINA NORTH CAROLINA Significant Factors of Cluster Analysis: Isotopes vs. Bathy./Lithography Cluster Mean δ 13 C MUD ROCK SAND % 50m Isobath % 150m Isobath “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 Introduction Pacific harbor seals (Phoca vitulina richardii ) are a common but understudied marine mammal on the Oregon coast. We conducted the first comprehensive satellite telemetry and isotopic study of harbor seals on the Oregon coast to determine areas of importance, and to investigate whether habitat use correlates with isotopic composition.. Telemetry and Isotope Analysis Wildlife Computers SPOT5© satellite tags were attached to 24 adult seals captured in two locations on the Oregon coast, USA. One whisker from each animal was collected and sectioned every 0.5cm The first 10 samples were analyzed for stable isotopes δ 13 C and δ 15 N. Telemetry data was processed (R packages ‘crawl’& ‘fixpath’) to generate regularized track lines with a 1:1 ratio of actual at-sea locations (n = 57,220). Cluster Analysis (Below) Two sets of hierarchical cluster analyses (Ward’s method; R package ‘cluster’) were used to determine the level of correlation between spatial behaviors and isotopic ratios of δ 13 C and δ 15 N, and to distinguish potential foraging groups. Results Telemetry data illuminated extensive, diverse and nearly-exclusive utilization of the continental shelf. Mean δ 13 C was significantly different between clusters in both sets of analyses. This study identified distinct foraging groups for seals in Oregon, and demonstrated δ 13 C as a potentially predictive factor of spatial foraging characteristics on the Oregon coast. Acknowledgements All work conducted under: NOAA MMPA Permit #16991 / OSU/San Jose State IACUC Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMap contributors, 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 50 12.5 Kilometers Devin S. Johnson (2017). crawl: Fit Continuous-Time Correlated Random Walk Models to Animal Movement Data. R package version 2.1.1. Maechler, M., Rousseeuw, P., Struyf, A., Hubert, M., Hornik, K. (2017). Cluster: Cluster Analysis Basics and Extensions. R package version 2.0.6. Funding for this project provided by: North Pacific Research Board Graduate Student Award, ARCS Oregon Scholar Award, The Oregon Community Foundation Salty Dog Fund, HMSC Mamie Markham Memorial Scholarship and Holt Education Award, and the ODFW Marine Reserves Scholarship. Thank you to the 2014 and 2015 capture teams! Correlating Isotopes + Telemetry Lithography of the Study Region Bathymetry of the Study Region Significant Factors of Cluster Analysis: Isotopes vs. Spatial Use Cluster Mean km from Shore Mean δ 13 C Mean Lat. Range Lat Range Long Home Range (km 2 ) “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, © OpenStreetMap contributors, and the GIS user community Inshore - Netarts Offshore - Alsea Inshore - Alsea Alsea Bay Netarts Bay Columbia River Legend 0 25 50 12.5 Kilometers * Spatial Habitat Use Bathymetry/Lithography Hierarchical cluster groups by spatial habitat use Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMap contributors, and the GIS user community ROCK MUD SAND Alsea Bay Netarts Bay Columbia River Legend 0 25 50 12.5 Kilometers OREGON WASHINGTON Esri, DeLorme, GEBCO, NOAA NGDC, and other contributors, Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMap contributors, and the GIS user community Legend Alsea Bay Seals Netarts Bay Seals Capture Site: Netarts Bay Capture Site: Alsea Bay Columbia River 0 25 50 12.5 Kilometers Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMap contributors, and the GIS user community Columbia River Legend 50m 100m 150m 200m 0 25 50 12.5 Kilometers Netarts Bay Alsea Bay 95% UD (Home Range) for all animals Study Region Contact: tinyurl.com/sealscientist | [email protected] Hierarchical cluster groups by geographic variables NMFS MMPA Permit #16991 QR Code for Digital Poster:
Transcript of You are where you eat: Correlating spatial habitat use and ... · R package version 2.0.6 ....
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
QRCodeforDigitalPoster:
