Life history of the cownose ray, Rhinoptera bonasus, in the northern Gulf of Mexico, with comments on geographic variability in life history traits
Life history of the cownose ray, Rhinoptera bonasus, in the northern Gulf of Mexico, with comments on geographic variability in life history traits
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墨西哥湾北部牛鼻鳐（Rhinoptera bonasus）的生活史，以及对生活史特征的地理变异性的评论
DOI：
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发表时间：
2005
影响因子：
1.4
通讯作者：
B. Thompson
中科院分区：
文献类型：
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作者：
J. Neer;B. Thompson
概要我们确定了年龄和生长，成熟时的大小，和繁殖力的牛鼻射线，Rhinoptera bonnación，从墨西哥湾北方收集。女性的脊椎年龄估计范围为0+至18+岁，男性为0+至16+岁。用边际生长量分析验证了生长量的年沉积。似然比检验表明，牛鼻射线的增长是最好的描述组合性别Gompertz模型。50%成熟时的中位尺寸被确定为雄性为642 mm DW，雌性为653 mm DW，或4-5岁。幼仔出生时的中位尺寸估计为350 mm DW，妊娠期为11-12个月。在所有情况下，妊娠雌性仅包含一只幼仔。墨西哥湾和西大西洋的增长曲线之间检测到统计学显着差异。墨西哥湾的牛鼻鳐的DW∞和K的估计值较低，理论寿命高于西大西洋的同类。墨西哥湾的牛鼻鳐也比西大西洋的牛鼻鳐成熟得更小，年龄也更早。
SynopsisWe determined age and growth, size at maturity, and fecundity for cownose rays, Rhinoptera bonasus, collected from the northern Gulf of Mexico. Vertebral age estimates ranged from 0+ to 18+ years for females and 0+ to 16+ years for males. Annual deposition of growth increments was verified with marginal increment analysis. Likelihood ratio tests indicated that the growth of the cownose ray was best described by a combined sexes Gompertz model. Median size at 50% maturity was determined to be 642 mm DW for males and 653 mm DW for females, or 4–5 years of age. Median pup size-at-birth was estimated to be 350 mm DW, with a gestation period of 11–12 months. In all cases, gravid females contained only one pup. Statistically significant differences were detected between growth curves for the Gulf of Mexico and the western Atlantic Ocean. Cownose rays in the Gulf of Mexico had lower estimates of DW∞ and K, and a higher theoretical longevity than their conspecifics in the western Atlantic Ocean. Cownose rays in the Gulf of Mexico also attain maturity at a smaller size and earlier age than their counterparts in the western Atlantic Ocean.