Variation in longevity, growth, and morphology in exploited Nile monitors (Varanus niloticus) from Sahelian Africa
Variation in longevity, growth, and morphology in exploited Nile monitors (Varanus niloticus) from Sahelian Africa
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DOI：
10.1670/0022-1511(2002)036
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发表时间：
2002-09-01
影响因子：
0.8
通讯作者：
Hémery, G
中科院分区：
文献类型：
--
作者：
de Buffrénil, V;Hémery, G
身体的大小，年龄和增长进行了研究，在样本中的尼罗河巨蜥从水开发人口。一个样本来自马里的尼日尔三角洲中部，另外两个来自乍得湖。在最受剥削的动物中，口鼻长度、平均年龄和寿命都有所减少。这些表现出一种特征性的躯体生长模式：大小增加到所有月份的年龄，然后在54个月后急剧下降到可以忽略不计的水平。相反，在开发较少的种群中，最初的增长较慢，但在个体寿命的限度内保持在一个可持续的水平。这些结果表明，快速增长和早期性成熟都有助于人口的住宿剥削监测人口的性成熟和生殖输出的数据。
Body size, age, and growth were studied in samples of Nile monitor lizards from variably exploited populations. One sample originated from the central Niger delta, in Mali, and the other two from Lake Chad. Snout-vent length, mean age, and longevity were reduced in the most exploited animals. These exhibited a characteristic pattern of somatic growth: size increased up to an age of all months and then dropped steeply to a negligible level after 54 months. Conversely, in the less exploited populations, initial growth was slower but remained at a sustained level within the limits of individual longevity. With reference to available data on sexual maturation and reproductive output in harvested Varanus niloticus, these results suggest that rapid growth and early sexual maturity both contribute to a demographic accommodation in exploited monitor populations.