دورية أكاديمية
Common dolphins (Delphinus delphis) in Israel: Unique dynamics of a critically endangered population
العنوان: | Common dolphins (Delphinus delphis) in Israel: Unique dynamics of a critically endangered population |
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المؤلفون: | Yaly Mevorach, Aviad Scheinin, Ori Galili, Nina Luisa Santostasi, Dan Tchernov |
المصدر: | Frontiers in Marine Science, Vol 9 (2022) |
بيانات النشر: | Frontiers Media S.A., 2022. |
سنة النشر: | 2022 |
المجموعة: | LCC:Science LCC:General. Including nature conservation, geographical distribution |
مصطلحات موضوعية: | common dolphins, IUCN red list, conservation status, extinction risk, abundance, mark-recapture, Science, General. Including nature conservation, geographical distribution, QH1-199.5 |
الوصف: | The most eastern population of common dolphins (Delphinus delphis) in the Mediterranean Sea inhabits the southern coastal waters of Israel. They are mainly observed in the shallow waters off Ashdod and Ashkelon, between the 15-30 m isobaths, with no reported observations north or west of this area. These dolphins were observed and studied year-round between 2016-2021 using boat-based surveys and photo identification methods. Common dolphins were encountered and photographed 43 times during the study period, resulting in 2,851 identifications of 25 distinctive mature individuals and 12 calves. Most individuals (62%) were sighted over multiple years, with high yearly and monthly sighting rates, indicating long-term site fidelity and residency. Closed population mark-recapture models estimated a total abundance of 25 (95% CI 24 – 37) individuals in 2016 that declined to only 15 (95% CI 15 – 15) individuals in 2021. Social network analysis described these remaining individuals as one closed and well-associated social unit. Survival probabilities for this population appeared lower than those of other delphinid populations. The decrease in their abundance, coupled with their apparent isolation level, qualifies the local population for a re-assessment of their conservation status. This study first describes the Israeli local population of common dolphins, their dynamics and an assessment of their status based on the IUCN Red List framework. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 2296-7745 |
Relation: | https://www.frontiersin.org/articles/10.3389/fmars.2022.916950/full; https://doaj.org/toc/2296-7745 |
DOI: | 10.3389/fmars.2022.916950 |
URL الوصول: | https://doaj.org/article/9d047205295e4300a5647cdde5f354d3 |
رقم الأكسشن: | edsdoj.9d047205295e4300a5647cdde5f354d3 |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 22967745 |
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DOI: | 10.3389/fmars.2022.916950 |