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Comparison of green turtle Chelonia mydas sex ratios at two time-points over 20 years at a foraging ground in Yaeyama Islands, Ryukyu Archipelago, Japan
http://hdl.handle.net/10659/00006683
http://hdl.handle.net/10659/00006683b1b2862c-6c1b-401b-97f7-be53f3038881
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
R-2020-231_matsuda.pdf (605.7 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2020-11-18 | |||||
| タイトル | ||||||
| タイトル | Comparison of green turtle Chelonia mydas sex ratios at two time-points over 20 years at a foraging ground in Yaeyama Islands, Ryukyu Archipelago, Japan | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Green turtle | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Sex ratio | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Migration | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Recruitment | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Global warming | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Green turtle | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Sex ratio | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Migration | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Recruitment | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Global warming | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
Kameda, Kazunari
× Kameda, Kazunari× 鈴木, 一由× Kuroyanagi, Kenji× Takase, Mai× 松田, 一哉× 能田, 淳 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Sex ratio is an important factor in population dynamics as it influences the production of offspring; understanding the sex ratio of a given population is vital for the conservation of endangered species. In sea turtles, the sex of hatchlings is temperature dependent, with warmer incubation temperatures producing more female hatchlings. The rise in temperatures due to global warming may skew the sex ratios towards females. We studied the sex ratio of immature green turtles at a foraging ground in the Yaeyama Islands from 1997-1999 and from 2016-2017, using laparoscopy. The overall proportion of females was 68.2% (N = 314), and proportions were not significantly different between 1997-1999 (69.9%; N = 183) and 2016-2017 (65.6%; N = 131). Thus, sex ratios have not changed at this site over the last 20 years, suggesting minor or no effect of global warming/environmental influences on this population. The small size class (<55 cm straight carapace length [SCL]) was more female biased than the large size class (≥55 cm SCL) during both periods, which suggests the possibility of movement into or out of the foraging aggregation. Therefore, future research must clarify how the initial recruitment into the foraging aggregations, and the subsequent migrations affect sex ratios. | |||||
| 書誌情報 |
Endangered Species Research 巻 38, p. 127-134, 発行日 2019-03 |
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| ISBN | ||||||
| 識別子タイプ | ISBN | |||||
| 関連識別子 | 1863-5407 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | https://doi.org/10.3354/esr00944 | |||||
| 権利（URI） | ||||||
| 権利情報 | http://creativecommons.org/licenses/by-nc/4.0/ | http://creativecommons.org/licenses/by-nc/4.0/ | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 出版者 | ||||||
| 出版者 | Inter-Research | |||||
| 資源タイプ | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Article | |||||
