Reptilia |
Crocodilia |
Alligatoridae
環境：環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
Benthic; 新鮮な水; 汽水性の. Subtropical; 36°N - 25°N, 106°W - 75°W
Western Central Atlantic: Southeast USA (Alabama, Arkansas, North and South Carolina, Florida, Georgia, Louisiana, Mississippi, Oklahoma, Texas).
初回成熟時の長さ / サイズ / 重さ / 年齢
成熟: Lm 1.8 range ? - ? cm Max length : 427 cm TL オス/雌雄の選別がない; (参照 80293); 309.9 cm TL (female); 最大公表体重: 473.10 g (参照 80293); 最大公表体重: 473.10 g
Broad snout with bony nasal bridge; edge of upper jaw overlaps with teeth of lower jaw when mouth closed. Juveniles are miniature adults with bright yellow cross-bands on black skin; yellow bands turn to olive brown. Skin around jaws, neck and belly are creamy white. Pale ventral surface, scales near tail black. Bony plates on scales of belly. Olive green eyes (Ref. 77040). Sexual dimorphism visible only on juveniles and adults greater than 0.6 m.
Can tolerate saline waters for short periods of time. Construct burrows used for shelter and hibernation at low temperatures. Construct alligator holes for refuge during dry periods. May cross land when alligator holes dry out to find another body of water. Opportunistic feeders. Juveniles feed on small invertebrates (insects, frogs) and small fish. Dietary range increases as size increases and larger adults consume all aquatic and terrestrial prey (fish, turtles, small mammals, birds, reptiles including small alligators). May also scavenge. Feeding activity related to temperature, decreasing at temperatures below 20 to 23°C. Ectothermic. Home range size of adult males is 2000 acres (Ref. 80292).
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Courtship rituals involve rapid head-slapping on water surface, body postures reinforced with odor from musk glands. Courtship synchronizes spermatogenesis and ovulation. Female creates the nest, often the same site each year and near an 'alligator hole' from freshly torn up vegetation and mud (usually at the start of summer) above the water level. Female lays 20-50 eggs (average of 40-45), remains near the nest until eggs hatch, sometimes breaking the egg to help hatchlings out. She then takes 8-10 hatchlings in her mouth and carries them to the water encouraging them to swim out. Juveniles form pods which often stay close to the mother for a period of up to 2 years.
主な参考文献
参考文献 | コーディネーター | 協力者
Britton, A. 2002 Alligator mississippiensis (DAUDIN, 1801). Crocodilian Species List. [ttp://www.flmnh.ufl.edu/cnhc/csp_amis.htm#dist, accessed 16 July 2008]. (参照 77040)
IUCNのレッドリストの状況は
(参照 130435: Version 2025-2 (Global))
ワシントン条約ステータス (参照 108899)
Not Evaluated
人間に対する脅威
Traumatogenic
人間の用途
水産業: 商業; 水産養殖: 商業
FAO - 水産業: landings search; Publication: search | FishSource | 私達の周りの海
用具
インターネットの情報源
モデルに基づく推定値
漁業の脆弱性
(参照 71543) |
Very high vulnerability (78 of 100). |
価格帯
(参照 80766): |
Unknown. |
