Occurence and residency patterns of humpback whales off Réunion Island during 2004–10
نویسندگان
چکیده
Dedicated humpback whale surveys were conducted around Réunion Island during 2004–10. Boat-based from June to October, in the main objective of collecting photo-identification data. For 2004–10, a total 501 survey trips, representing 1,530 hours onsearching effort, and 724 sightings achieved. Although effort had significant influence on number sightings, sighting rate was shown increase significantly 2007 onwards, with peak 2008. Seasonal variations observed, higher numbers occurring July–September. Larger whales, together increased led larger datasets collected 2008–10, allowing further investigation residency pattern. Within-year recaptures fluke photographs showed that relatively large proportion (30%) identified whales recaptured more than one day island. Maximum recapture interval reached 64 days, mean ranging 22–29 days for 2008–10. Mean residency, estimated expected lagged identification rate, 25 days. Mothers calf reside island longer period time other individuals. A seasonal pattern demonstrated, single capture individuals early season, mainly as singleton or pairs, while showing present August October. Between-year reported 2009–10, five re-sighted consecutive years. The catalogue includes 312 distinct 2004–10 surveys, 21 additional captured opportunistically since 2001. increasing trend high observed 2008–10 recent occurrence inter-annual suggest has become an important migratory site within south-western Indian Ocean (Breeding Stock C). species might expand its spatial range by occupying new breeding sites (or re-occupying old ones) ocean, result population growth.
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ژورنال
عنوان ژورنال: The journal of cetacean research and management
سال: 2023
ISSN: ['1561-0713', '2312-2692']
DOI: https://doi.org/10.47536/jcrm.v12i2.583