Gender and geographic variation in morphometrics of white-chinned petrels (Procellaria aequinoctialis) in New Zealand and their foraging activities as determined from fisheries bycatch | Notornis and Birds New Zealand

Southern Bird

Bell, EA¹  Mischler, CP¹  Robertson, CJR¹ 

关键词: bycatch;    discriminant function analysis;    fisheries;    foraging;    geographic;    morphometric;    White-chinned petrel;   

DOI  :  

学科分类：农业科学（综合）

来源: Ornithological Society of New Zealand Inc.

【 摘 要 】

Discriminantfunctionanalysis(DFA)wasusedtodeterminegenderandgeographicvariationinthemorphometricsofwhite-chinnedpetrels(Procellariaaequinoctialis)measuredfromfisheriesbycatchinNewZealand.Samplesweredividedinto5clustersbasedoncapturelocation.ADFAmodelwascreatedusingadultbreedingbirdspresumedtobefromthe2mainlocationsattheAucklandIslandsandAntipodesIslands.Geographicvariationinheadandbill,skullwidth,culmen,culmendepthatbase,culmenwidthatbase,rightandleftmid-toeandclaw,tail,andrightandleftwingwasfoundbetweenbirdspresumedtobefromthe‘Auckland’and‘Antipodes’clusters,with‘Antipodes’birdsbeinggenerallylargerthan‘Auckland’birds.Gendervariationinheadandbill,skullwidth,culmen,culmendepthatbase,culmenwidthatbase,minimumbilldepth,rightandleftmid-toeandclaw,rightwing,rightandlefttarsusexistedfor‘Auckland’birds.Gendervariationinheadandbill,skullwidth,culmen,culmendepthatbase,culmenwidthatbase,minimumbilldepth,rightandleftmid-toeandclaw,andtailexistedfor‘Antipodes’birds.Birdsintheother3clusterswereclassifiedasoriginatingfromtheAucklandIslandsorAntipodesIslands.TheclusteringsuggestedthatbirdsfromtheAucklandIslandstendedtoforagemostlynorthandwest,whereasbirdsfromtheAntipodesIslandsforagedmostlytowardsthenorth.TherewerelargeoverlapsatPuysegurPointandparticularlytheChathamRiseofbirdsfrombothbreedinglocations.Thisstudyshowstheusefulnessofbycatchnecropsies,andemphasisestheneedforfurtherstudiesingeographicvariationandsexualdimorphismatallNewZealandbreedinglocations.

【 授权许可】

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