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首页> 外文期刊>Indian Journal of Fisheries >Certain aspects of biology of the freshwater crab Travancoriana schirnerae (Bott, 1969) (Brachyura: Gecarcinucidae)
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Certain aspects of biology of the freshwater crab Travancoriana schirnerae (Bott, 1969) (Brachyura: Gecarcinucidae)

机译:淡水蟹Travancoriana schirnerae(Bott,1969)的某些生物学方面(Brachyura:Gecarcinucidae)

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摘要

Biology of the freshwater crab Travancoriana schirnerae was studied with respect to sexual dimorphism and sex ratio from June 2009-August 2011. A total of 3605 individuals were collected of which 2168 (60.3%) were males and 1437 (39.7%) females. The sampled population comprised of juvenile males (15.3%), adult males (45%), juvenile females (9.3%), adult non-ovigerous (27.9%), ovigerous (0.6%) and juvenile bearing females (1.9%) and grouped into six size classes (0-1, 1.1-2, 2.1-3, 3.1-4, 4.1-5 and 5.1-6 cm). Results of this study indicated that the population exhibited sexual dimorphism with reference to size, chelae and cheliped dimensions and abdomen morphology. Adult males were heterochelous whereas females exhibited both heterochely and isochely in almost equal proportion (53 and 47% respectively). No significant difference was found in handedness preponderance for the sexes. Chi-square analysis showed that the sex ratio of the population significantly deviated from the 1:1 ratio with males outnumbering females
机译:从2009年6月至2011年8月,研究了淡水蟹Travancoriana schirnerae的性别,性别比的生物学特性。共收集了3605个个体,其中雄性2168个(60.3%),雌性1437个(39.7%)。抽样人群包括成年男性(15.3%),成年男性(45%),成年女性(9.3%),成年非雌性(27.9%),雌性(0.6%)和未成年雌性(1.9%)并分组分为六个尺寸级别(0-1、1.1-2、2.1-3、3.1-4、4.1-5和5.1-6厘米)。这项研究的结果表明,该人群表现出性别,性别,大小和唇部大小以及腹部形态方面的性别差异。成年男性是异性恋,而女性则以几乎相等的比例表现出异性恋和同性恋(分别为53%和47%)。在性别优势方面没有发现显着差异。卡方分析显示,人口性别比明显偏离了1:1的比例,男性多于女性

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