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Rostrum abnormalities in the endangered Indian Ocean humpback dolphin(Sousa plumbea)in South Africa

Integrative Zoology 2023年第4期18卷 616-629页

作者： Guilherme FRAINER simon elwen Sasha DINES Bridget JAMES Els VERMEULEN Gwenith PENRY OAlejandra VARGAS-FONSECA Shanan ATKINS Danielle CONRY Tess GRIDLEY Centre for Statistics in Ecology Environment and ConservationUniversity of Cape TownSouth Africa Sea Search Research and Conservation Cape TownSouth Africa Department of Botany and Zoology Stellenbosch UniversityStellenboschSouth Africa Mammal Research Institute Whale Unit Faculty of Natural and Agricultural SciencesUniversity of PretoriaPretoriaSouth Africa Institute for Coastal and Marine Research Nelson Mandela UniversityGqeberhaSouth Africa Department of Oceanography Nelson Mandela UniversityGqeberhaSouth Africa Animal Plant and Environmental SciencesUniversity of the WitwatersrandJohannesburgSouth Africa Mammal Research Institute Department of Zoology and EntomologyUniversity of PretoriaPretoriaSouth Africa

Morphological abnormalities in wild animals can be indicators of the underlying health of a population and may be determined through routine photographic ***,we assess unusual rostrum conditions in Indian Ocean humpback dolphins(Sousa plumbea)inhabiting South African coastal waters to understand the rate of prevalence of abnormal rostrums and formulate hypotheses on potential *** data were collated from sys-tematic boat surveys and opportunistic sightings,obtained between April 1998 and March 2021 in various regions along the South African ***,31 unique individuals were found with abnormal rostrum conditions,vary-ing from slight misalignments to severe wounds and/or aberrant *** most cases,injuries were likely caused by natural events during the animal’s life history such as interactions with sharks and/or reef-associated hunting ***–recapture data indicated that individuals had survived with these injuries for up to 10 *** study reports the highest incidence of rostrum abnormalities in the *** numbers reﬂect only those that have survived their injuries,they are considered a minimum estimate.A better understanding of the cause(s)of these injuries is important given the endangered status of this species.

关键词： endangered species human impacts injuries mark-recapture natural history

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