دورية أكاديمية
Demographic characteristics of Australian humpback dolphins reveal important habitat toward the southwestern limit of their range
| العنوان: | Demographic characteristics of Australian humpback dolphins reveal important habitat toward the southwestern limit of their range |
|---|---|
| المؤلفون: | Hunt, TN, Bejder, L, Allen, SJ, Rankin, RW, Hanf, D, Parra, GJ |
| المصدر: | Endangered Species Research, Vol 32, Pp 71-88 (2017) |
| بيانات النشر: | Inter-Research, 2017. |
| سنة النشر: | 2017 |
| المجموعة: | LCC:Zoology LCC:Botany |
| مصطلحات موضوعية: | Zoology, QL1-991, Botany, QK1-989 |
| الوصف: | The paucity of information on the recently described Australian humpback dolphin Sousa sahulensis has hindered assessment of its conservation status. Here, we applied capture-recapture models to photo-identification data collected during boat-based surveys between 2013 and 2015 to estimate the abundance, site fidelity and residence patterns of Australian humpback dolphins around the North West Cape (NWC), Western Australia. Using Pollockís closed robust design, abundance estimates varied from 65 to 102 individuals, and POPAN open modelling yielded a super-population size of 129 individuals in the 130 km2 study area. At approximately 1 humpback dolphin per km2, this density is the highest recorded for this species. Temporary emigration was Markovian, suggesting seasonal movement in and out of the study area. Hierarchical clustering showed that 63% of individuals identified exhibited high levels of site fidelity. Analysis of lagged identification rates indicated dolphins use the study area regularly, following a movement model characterised by emigration and re-immigration. These density, site fidelity and residence patterns indicate that the NWC is an important habitat toward the southwestern limit of this speciesí range. Much of the NWC study area lies within a Marine Protected Area, offering a regulatory framework on which to base the management of human activities with the potential to impact this threatened species. Our methods provide a methodological framework to be used in future environmental impact assessments, and our findings represent a baseline from which to develop long-term studies to gain a more complete understanding of Australian humpback dolphin population dynamics. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1863-5407 1613-4796 |
| Relation: | https://www.int-res.com/abstracts/esr/v32/p71-88/; https://doaj.org/toc/1863-5407; https://doaj.org/toc/1613-4796 |
| DOI: | 10.3354/esr00784 |
| URL الوصول: | https://doaj.org/article/0ed3d9fcd5444bf1abe6b78adb3c18a0 |
| رقم الأكسشن: | edsdoj.0ed3d9fcd5444bf1abe6b78adb3c18a0 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 18635407 16134796 |
|---|---|
| DOI: | 10.3354/esr00784 |