Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago
An understanding of the survival probability and abundance of endangered species is critical for their effective conservation and management. In this study, long-term capture-mark-recapture data were used to estimate the apparent survival probability and abundance of green turtles Chelonia mydas at...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Inter-Research
2023-03-01
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| Series: | Endangered Species Research |
| Online Access: | https://www.int-res.com/abstracts/esr/v50/p209-215/ |
| _version_ | 1797822267898462208 |
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| author | K Kameda M Wakatsuki M Takase Y Nakanishi N Kamezaki |
| author_facet | K Kameda M Wakatsuki M Takase Y Nakanishi N Kamezaki |
| author_sort | K Kameda |
| collection | DOAJ |
| description | An understanding of the survival probability and abundance of endangered species is critical for their effective conservation and management. In this study, long-term capture-mark-recapture data were used to estimate the apparent survival probability and abundance of green turtles Chelonia mydas at Kuroshima Island in the Yaeyama Islands, Japan. A total of 453 turtles were captured from 2009 to 2020 using entangling nets. All captured turtles were juveniles and subadults; no adult turtles were captured during this study. The estimated apparent survival rate of this aggregation was 0.82 (95% CI = 0.76-0.86) using the Cormack-Jolly-Seber model, which accounts for both permanent emigration and death. Annual abundance was estimated using the Horvitz-Thompson estimator. Estimated abundance increased from 234 (95% CI = 182-286) in 2009 to 418 (95% CI = 325-510) in 2020. This trend in abundance for green turtles in the foraging ground may result from the increasing nesting population in this region. Our study provides information for understanding the life cycle of green turtles in the Yaeyama Islands and for the conservation and management of marine ecosystems in this region. |
| first_indexed | 2024-03-13T10:05:30Z |
| format | Article |
| id | doaj.art-7ea5b342dc134054a14c452a329cf5ba |
| institution | Directory Open Access Journal |
| issn | 1863-5407 1613-4796 |
| language | English |
| last_indexed | 2024-03-13T10:05:30Z |
| publishDate | 2023-03-01 |
| publisher | Inter-Research |
| record_format | Article |
| series | Endangered Species Research |
| spelling | doaj.art-7ea5b342dc134054a14c452a329cf5ba2023-05-22T13:10:04ZengInter-ResearchEndangered Species Research1863-54071613-47962023-03-015020921510.3354/esr01228Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu ArchipelagoK Kameda0M Wakatsuki1M Takase2Y Nakanishi3N Kamezaki4Kuroshima Research Station, Sea Turtle Association of Japan, 136 Kuroshima Taketomi-cho, 907-1311 Okinawa Prefecture, JapanKuroshima Research Station, Sea Turtle Association of Japan, 136 Kuroshima Taketomi-cho, 907-1311 Okinawa Prefecture, JapanThe University of Tokyo, 7-3-1 Hongo Bunkyo-ku, 113-0033 Tokyo, JapanKuroshima Research Station, Sea Turtle Association of Japan, 136 Kuroshima Taketomi-cho, 907-1311 Okinawa Prefecture, JapanOkayama University of Science, Faculty of Biosphere-Geosphere Science, 1-1 Ridai-cho, Okayama City, 700-0005 Okayama Prefecture, JapanAn understanding of the survival probability and abundance of endangered species is critical for their effective conservation and management. In this study, long-term capture-mark-recapture data were used to estimate the apparent survival probability and abundance of green turtles Chelonia mydas at Kuroshima Island in the Yaeyama Islands, Japan. A total of 453 turtles were captured from 2009 to 2020 using entangling nets. All captured turtles were juveniles and subadults; no adult turtles were captured during this study. The estimated apparent survival rate of this aggregation was 0.82 (95% CI = 0.76-0.86) using the Cormack-Jolly-Seber model, which accounts for both permanent emigration and death. Annual abundance was estimated using the Horvitz-Thompson estimator. Estimated abundance increased from 234 (95% CI = 182-286) in 2009 to 418 (95% CI = 325-510) in 2020. This trend in abundance for green turtles in the foraging ground may result from the increasing nesting population in this region. Our study provides information for understanding the life cycle of green turtles in the Yaeyama Islands and for the conservation and management of marine ecosystems in this region.https://www.int-res.com/abstracts/esr/v50/p209-215/ |
| spellingShingle | K Kameda M Wakatsuki M Takase Y Nakanishi N Kamezaki Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago Endangered Species Research |
| title | Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago |
| title_full | Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago |
| title_fullStr | Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago |
| title_full_unstemmed | Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago |
| title_short | Apparent survival probability and abundance of juvenile green turtles in the foraging ground at Kuroshima Island, Ryukyu Archipelago |
| title_sort | apparent survival probability and abundance of juvenile green turtles in the foraging ground at kuroshima island ryukyu archipelago |
| url | https://www.int-res.com/abstracts/esr/v50/p209-215/ |
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