Aves |
Charadriiformes |
Laridae
環境： 環境 / 氣候帶 / 深度上下限 / 配送範圍
生態學
Others. Temperate
Eastern Pacific and Western Atlantic. Subtropical to temperate.
初熟時的長度 / 大小 / 重量 / 年齡
成熟度: Lm ? range ? - ? cm Max length : 68.0 cm TL 雄魚/尚未辨別雌雄; (參考文獻 8812); 最大體重: 1.0 kg (參考文獻 356)
Culmen: 5.56 cm; tarsus: 7.197 cm; wing: 41.2 cm.
Total Length: 61 to 68 cm; Wingspan: 132 to 142 cm (Ref. 8812). Occupies the continental shelf; <80 km (Ref. 356). Scavengers; exhibits kleptoparasitism (Ref. 356). Opportunistic feeders that eat a wide variety of food. Based on stable isotope analysis (SIA) diet study of egg albumin, belongs to lower N signature group (based on ratios of stable isotopes of nitrogen and carbon) indicating a more planktivorous diet. Switch in diet from garbage to fish when chicks hatch for its higher nutritional content to assure higher fledging success. Early breeding and early egg-laying assures higher fledging success for this species. On the Farallon Islands, California, high nest failures recorded during ENSO (El Niño) events; severe events in 1982-1983 causing adult mortality. (Ref. 87784).
生命週期和交配行為
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
主要參考資料
參考文獻 | 合作者 | 合作者
Schreiber, R.W. 1970 Breeding biology of Western gulls (Larus occidentalis) on San Nicolas Island, California, 1968. The Condor 72:133-140. (參考文獻 80153)
IUCN 瀕危狀態
(參考文獻 130435: Version 2025-2 (Global))
無危 (LC) ; Date assessed: 08 August 2018
CITES狀態 (參考文獻 108899)
Not Evaluated
Not Evaluated
對人類具威脅
人類使用
FAO - Publication: search | FishSource |
工具
更多資訊
人口動態成長最大年齡/尺寸長度重量比長度關係長度-頻率質量轉換豐度
網路資源
基於模型的估計
回復力
(Ref. 69278): |
高度, 族群倍增時間少於 15個月 (K=16.74-39.08) |
釣魚的脆弱性
(參考文獻 71543) |
Moderate to high vulnerability (47 of 100). |
價格種類
(參考文獻 80766): |
Unknown. |
