Sexual Dichromatism of “Rusty” Spots in a Population of Faxonius rusticus (Girard)

IF 0.8 Q4 MARINE & FRESHWATER BIOLOGY
Sean M. Hartzell
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引用次数: 0

Abstract

Sexual dichromatism is a common phenomenon among animal taxa and consists of differing coloration between sexes in a species. Specimens of the crayfish Faxonius rusticus (Girard) typically have a distinct “rusty” red spot on each side of the cephalothorax. These spots can display variation in both redness and size among specimens; however, little work appears to have been done examining variation in this trait. As a means of investigating possible sexual differences in the color and relative spot size (RSS) of the “rusty” spot in F. rusticus, this work utilized digital image analysis techniques to quantify the color and size of spots in a population of this species. Analyses revealed no difference in RSS between sexes; however, spots of females were significantly redder than those of males. Sexual dichromatism in the spot color of F. rusticus in this population could be relevant to mate discrimination during mating; however, this or other possible functions of this sexual color difference will need to be examined by behavioral studies.
黄褐法虱种群“锈斑”的性别二色性
性别二色性是动物分类群中常见的一种现象,由物种中不同性别的颜色组成。小龙虾Faxonius rusticus (Girard)的标本通常在头胸两侧有一个明显的“锈”红点。这些斑点可以在不同的标本中显示出红色和大小的变化;然而,研究这一特征变异的工作似乎很少。为了研究锈斑的颜色和相对斑大小(RSS)可能存在的性别差异,本研究利用数字图像分析技术量化了该物种一个种群中锈斑的颜色和大小。分析显示,性别间的相对过饱和度无差异;然而,雌性的斑点明显比雄性的更红。该种群斑点色的性别二色性可能与交配时的配偶歧视有关;然而,这种性别颜色差异的这种或其他可能的功能需要通过行为研究来检验。
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来源期刊
Freshwater Crayfish
Freshwater Crayfish MARINE & FRESHWATER BIOLOGY-
CiteScore
2.70
自引率
0.00%
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0
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