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首页> 外文期刊>Zoologia (Curitiba) >Population structure and reproductive biology of Uca rapax (Decapoda: Ocypodidae) in a tropical coastal lagoon, southeast Brazil
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Population structure and reproductive biology of Uca rapax (Decapoda: Ocypodidae) in a tropical coastal lagoon, southeast Brazil

机译：巴西东南部热带沿海泻湖中Uca rapax（十足目：蛇足科）的种群结构和生殖生物学

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摘要

A population of the fiddler crab Uca rapax (Smith, 1870) found in Itaipu Lagoon, southeast Brazil, was sampled monthly from July 2006 to June 2007 in order to study population and reproductive features. The sex ratio of the population was statistically different from the expected (1:1) in almost every month, with a predominance of males. The reproductive cycle and the recruitment of juveniles were continuous, with two peaks. The fecundity ranged from 1.110 to 13.189 eggs (4.984 ± 2.493.8), not differing statistically among seasons. In contrast, the relative fecundity (F') and the reproductive intensity index (RII) were highest in the summer. Female size at the onset of sexual maturity was estimated as 6.1 mm and egg diameter ranged from 0.20 to 0.28 mm. The anthropogenic impact on the environment of Itaipu Lagoon probably had adverse effects on the local U. rapax population, as inferred by its low fecundity rates, early maturation age and biased sex ratio.
机译：从2006年7月至2007年6月，每月对巴西东南部伊泰普泻湖发现的提琴蟹Uca rapax（史密斯，1870年）进行抽样，以研究其种群和生殖特征。几乎每个月，人口的性别比均与预期的（1：1）存在统计学差异，其中男性占多数。繁殖周期和少年的募集是连续的，有两个高峰。繁殖力范围从1.110到13.189个卵（4.984±2.493.8），在不同季节之间没有统计学差异。相反，夏季的相对繁殖力（F'）和生殖强度指数（RII）最高。性成熟开始时的雌性大小估计为6.1毫米，卵径为0.20至0.28毫米。人为的对伊泰普泻湖环境的影响可能对当地的U rapax种群产生了不利影响，这是由于其繁殖力低，早熟年龄和性别比例偏见所致。

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