Population structure of an endemic fish Limia zonata (Cyprinodontiformes: Poeciliinae) in the Maimón River, Dominican Republic

IF 0.2 Q4 ZOOLOGY NOVITATES CARIBAEA Pub Date : 2019-01-23 DOI:10.33800/NC.V0I13.190
Patricia Torres-Pineda, C. M. Rodríguez-Peña, Oscar M. Lasso-Alcalá, A. Marmolejo
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Abstract

 The population structure of Limia zonata (Nichols, 1915) was studied in four locations in the Maimón River, Monseñor Nouel province, Dominican Republic. The sex and adult-juveniles ratio was calculated for all sampled localities. It was found that the sex ratio of L. zonata was significantly different from 1: 1 and is biased towards females (1.0: 1.6). Juvenile fish were more abundant and frequent than adults (69.3%). More than 800 fish were measured and weighed to analyze the frequency of size classes, morphometry and body condition. Ten size classes were distinguished that vary in frequency according to sex. Total length of the specimens ranged from 6.50 to 65.69 mm, while weight varied between 0.004 and 3.941 g. The morphology varied between sexes and a pronounced sexual dimorphism was found. All the morphometric variables studied showed a high level of association (r). The adjustment of the regression models (r2) of the morphometric relationships was between 85% and 99%. The relationship between the standard length and the total weight was reflected in the rates of growth. The Relative Condition Factor (Kn) demonstrated the good state of health of this fish population, but also variations between the sexes were detected.
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多米尼加共和国Maimón河特有鱼类Limia zonata的种群结构
在多米尼加共和国Monseñor Nouel省Maimón河的四个地点研究了Limia zonata (Nichols, 1915)的种群结构。计算了所有采样地点的性别和成幼比。结果表明,水蛭的性别比明显高于1:1,偏向于雌性(1.0:1.6)。幼鱼数量和频率均高于成鱼(69.3%)。研究人员对800多条鱼进行了测量和称重,以分析鱼的体型、形态和身体状况。根据性别的不同,我们区分出了10个大小类别,它们的频率不同。试件总长度为6.50 ~ 65.69 mm,重量为0.004 ~ 3.941 g。形态在两性之间存在差异,并发现了明显的两性二态性。所有研究的形态计量变量均显示出高水平的相关性(r)。形态计量关系的回归模型调整(r2)在85% ~ 99%之间。标准长度和总重量之间的关系反映在生长率上。相对条件因子(Kn)表明该种群的健康状况良好,但也发现了性别之间的差异。
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来源期刊
自引率
25.00%
发文量
27
审稿时长
12 weeks
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