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- W2019918414 abstract "Regional populations of bottlenose dolphins (Tursiops truncatus) around New Zealand are genetically isolated from each other and the species was recently classified as nationally endangered based on relatively small population sizes and reports of high calf mortality. Here, we estimate the abundance and trends in one of these regional populations, the Bay of Islands, using a photo-identification database collected from 1997 to 1999 and from 2003 to 2006, containing a total of 3,841 records of 317 individual dolphins. Estimates of abundance obtained with the robust design fluctuated widely but showed a significant decline in the number of dolphins present in the bay over time (7.5% annual rate of decline). Temporary emigration was random and fluctuated considerably (γ = 0.18, SE = 0.07 to γ = 0.84, SE = 0.06). Apparent survival was estimated at 0.928 (CI = 0.911–0.942). Seasonal estimates (26 seasons) obtained in POPAN also showed a significant decline in abundance (5.8% annual rate of decline). Despite the decline observed in local abundance, dolphins continue to be found regularly in the Bay of Islands, suggesting that fewer dolphins use the bay on regular basis. Consequently, it seems that a change in habitat use, mortality and possibly low recruitment could underlie the apparent local decline." @default.
- W2019918414 created "2016-06-24" @default.
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- W2019918414 date "2013-01-01" @default.
- W2019918414 modified "2023-09-23" @default.
- W2019918414 title "Decline in local abundance of bottlenose dolphins (<i>Tursiops truncatus</i>) in the Bay of Islands, New Zealand" @default.
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- W2019918414 doi "https://doi.org/10.1111/mms.12008" @default.
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