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First demographic insights on historically harvested and poorly known male sperm whale populations off the Crozet and Kerguelen Islands (Southern Ocean)
journal contribution
posted on 2018-07-01, 00:00 authored by G Labadie, Paul Tixier, C Barbraud, R Fay, N Gasco, G Duhamel, C Guinet© 2018 Society for Marine Mammalogy Age and sex dependent spatial segregation has resulted in limited knowledge of the ecology and demography of sperm whale adult males feeding seasonally in high latitudes. This study focused on adult males interacting with the Patagonian toothfish (Dissostichus eleginoides) fishery operating off the Kerguelen and Crozet Archipelagos. Demographic parameters were estimated using a 10-yr-long photo-identification data set paired with multistate closed robust design capture-mark-recapture models. The examination of a set of 29,078 photographs taken from fishing vessels during sperm whale depredation events resulted in identification of 295 individuals with nine visiting both study areas. Dispersal between both study regions was estimated to be 1% per year. The mean annual number of interacting sperm whales was estimated to n = 82 (95% CI 58–141) in Crozet and n = 106 (95% CI 76–174) in Kerguelen. Transient proportions were 13% in Crozet and 26% in Kerguelen. Corrected for transience, apparent survival estimates were 0.953 (95% CI 0.890–0.993) in Crozet, and 0.911 (95% CI 0.804–0.986) in Kerguelen. These survival and population size estimates are the first for depredating adult males in high latitudes, and can be used in evaluating the current conservation status of this historically harvested stock and to investigate depredation trends in 35 both Crozet and Kerguelen Islands.
History
Journal
Marine mammal scienceVolume
34Issue
3Pagination
595 - 615Publisher
WileyLocation
Chichester, Eng.Publisher DOI
ISSN
0824-0469eISSN
1748-7692Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2018, Society for Marine MammalogyUsage metrics
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Science & TechnologyLife Sciences & BiomedicineMarine & Freshwater BiologyZoologyabundanceAntarcticmark-recapturemultistaterobust designsperm whalePhyseter macrocephalusCAPTURE-RECAPTURE DATAPATAGONIAN TOOTHFISH FISHERYKILLER WHALESORCINUS-ORCAPHYSETER-MACROCEPHALUSLONGLINE FISHERIESDEPREDATION LEVELSMARINE MAMMALSNORTH PACIFICEvolutionary BiologyZoologyEcology
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