蟹类中不同形态特征的表达与性别和发育阶段有关

Pub Date : 2024-06-04 DOI:10.3989/scimar.05379.084
Lucas Nunes da Silva, Mauro de Melo Júnior, R. A. Shinozaki-Mendes
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引用次数: 0

摘要

本研究的假设是,Goniopsis cruentata生长率的显著变化与性间和年龄相关特征有关,特别是在被确定为第二性征的区域(褶、胴和螯)。从2019年2月到2020年1月,共捕获了713只个体,其中雄性378只,雌性335只,腕宽从0.42厘米到6.59厘米不等。雄性和雌性在所有线性形态测量关系中均表现出负异构(β0<1),在所有比较中均存在个体发育差异(p=0.0001)。在几何形态测量中,背视图显示出显著的性别差异(p=0.0001),雄性的后部比雌性宽。此外,幼年雌性和成年雌性的腹部也有显著差异(p=0.0001),幼年雌性腹部呈三角形,成年雌性腹部呈椭圆形,这是腕足动物的特征。我们观察到螯足形状在性别比较(F×M)和侧向(R×L)中的形态分离(p=0.0001),没有本体变异(A×J)。鳕形目(Goniopsis cruentata)表现出显著的个体发育和性别二态性。此外,在树栖物种中发现了螯足变异,而这些物种并没有表现出高度的异型性。了解这些个体发育变异对于制定有效的保护策略至关重要,因为这有助于确定特定的生命阶段及其相应的需求。
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Differentially expressed morphological characters depend on sex and ontogenetic stage in the crab Goniopsis cruentata (Crustacea: Grapsidae)
The hypothesis of this study was that significant variations in the growth rates of Goniopsis cruentata are related to intersexual and age-related characteristics, particularly in areas identified as secondary sexual (pleon, carapace and chelipeds). From February 2019 to January 2020, a total of 713 individuals were captured, 378 males and 335 females, with a carapace width ranging from 0.42 to 6.59 cm. Males and females showed negative allometry (β0<1) for all linear morphometric relationships, with an ontogenetic difference (p=0.0001) for all comparisons. In geometric morphometry, the dorsal view showed a significant difference in sexual comparisons (p=0.0001), in which males were wider in the posterior region than females. Furthermore, there was a significant difference in the abdominal region between young and adult females (p=0.0001), with the young ones being triangular and the adults oval, a characteristic brachyuran behaviour. We observed morphological separation in cheliped shape in sexual comparison (F×M) and laterality (R×L) (p=0.0001), with no ontogenetic variations (A×J). Goniopsis cruentata showed a noteworthy ontogenetic and sexual dimorphism. In addition, the discovery of cheliped variation was recorded for arboreal species that do not show a high degree of heterochely. Understanding these ontogenetic variations is crucial for effective conservation strategies because it allows specific life stages and their corresponding needs to be identified.
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