Sexual Dimorphism and Diet Segregation in the Black Skimmer Rynchops niger
[摘要] Sexualsegregationduringforagingiscommoninbirdsandmayoccuratdifferenttemporalandspatialscales.InthisstudyweexploredthedegreeofsexualsegregationintheBlackSkimmerRynchopsnigerbystudyingthespeciesandsizesofpreyconsumedbyeithersex.Moreoverweassessedthedistributionofthesexesoverthestudyarea.WedevelopedamultivariatetoolforsexdeterminationinBlackSkimmersbyusingmorphometricmeasurementsfrombirdsofknownsex.Birdscapturedwithmistnetsandmuseumskinswereanalysed.ThesexofbirdswasdeterminedbyPCRamplificationofDNAorbygonadinspection.Thefishpreyremainsobtainedfromspontaneousregurgitationsofcapturedbirdswereusedtoestimatetotallengthandweightofconsumedfishprey.Thebulkofthedietofbothsexeswasgenerallycomposedofthesamespecies(mostlysilversidesOdontesthesspp.),butmalesconsumedlargerpreythanfemales.Thesexratiointhelagoonwasstronglyskewedtowardsfemales.Wediscusstheimplicationsofsexualsegregationforhabitatandspeciesconservationmeasures.
[发布日期] [发布机构]
[效力级别] [学科分类] 动物科学
[关键词] Rynchops Niger [时效性]
