Just a matter of size? Evaluating allometry and intersexual heterometry in Pagurus bernhardus using ratios and indices (Decapoda, Anomura)

IF 3.5 1区 生物学 Q1 ZOOLOGY
Michel SCHMIDT, Ines MARTIN, Roland R. MELZER
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Abstract

Heterochely denotes the presence of dissimilarly sized chelipeds on opposite sides of the body, a prevalent occurrence in diverse crustaceans. Conversely, heterometry pertains to the quantifiable disparities in size between these chelipeds. Both chelipeds hold pivotal roles in activities such as foraging, mating, and defense. Consequently, individuals of both genders in heterochelic species exhibit this morphological pattern. Previous studies have identified sexual dimorphism in cheliped size, with males displaying larger major chelipeds compared to females, albeit solely relying on propodus length as a size proxy and focusing solely on the major cheliped. In our study, we meticulously examined 190 specimens of the common European hermit crab Pagurus bernhardus from two collections. We sought to elucidate allometric relationships and assess whether heterometry exhibited sex-based differences when adjusting for body size by using ratios. Our findings revealed that male chelipeds displayed hyperallometric growth relative to females, and all three calculated heterometry indices exhibited significant disparities between the sexes. Consequently, male specimens exhibited larger major and minor chelipeds, even when theoretically matched for body size with females. This phenomenon may be attributed, among other factors, to male–male contests. Should indirect mate selection favor males with larger chelipeds in proportion to their body size, this dynamic could potentiate sexual selection in their favor.

Abstract Image

Abstract Image

只是大小问题?利用比率和指数评估白鲦的异体和两性异体(十足目,无尾目)
Heterochely 表示身体两侧存在大小不同的螯足,这是各种甲壳类动物的普遍现象。相反,heterometry则是指这些螯足之间可量化的大小差异。两个螯足在觅食、交配和防御等活动中都起着关键作用。因此,异螯物种的两性个体都表现出这种形态模式。以前的研究发现了螯足大小的性双态性,雄性的主要螯足比雌性的大,尽管这些研究仅仅依赖于螯足的长度作为大小的替代物,并且仅仅关注主要螯足。在我们的研究中,我们仔细检查了来自两个收藏馆的 190 个欧洲常见寄居蟹 Pagurus bernhardus 标本。我们试图阐明异速关系,并评估在使用比率调整体型时,异速是否表现出性别差异。我们的研究结果表明,雄性螯足相对于雌性螯足显示出超计量增长,所有三个计算出的异计量指数都显示出性别间的显著差异。因此,雄性标本的主要螯足和次要螯足都较大,即使理论上其体型与雌性相匹配。除其他因素外,这一现象可能归因于雄性之间的竞争。如果间接的配偶选择有利于螯足与体型成比例的较大的雄性,那么这种动态可能会促进有利于雄性的性选择。
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来源期刊
CiteScore
6.40
自引率
12.10%
发文量
81
审稿时长
>12 weeks
期刊介绍: The official journal of the International Society of Zoological Sciences focuses on zoology as an integrative discipline encompassing all aspects of animal life. It presents a broader perspective of many levels of zoological inquiry, both spatial and temporal, and encourages cooperation between zoology and other disciplines including, but not limited to, physics, computer science, social science, ethics, teaching, paleontology, molecular biology, physiology, behavior, ecology and the built environment. It also looks at the animal-human interaction through exploring animal-plant interactions, microbe/pathogen effects and global changes on the environment and human society. Integrative topics of greatest interest to INZ include: (1) Animals & climate change (2) Animals & pollution (3) Animals & infectious diseases (4) Animals & biological invasions (5) Animal-plant interactions (6) Zoogeography & paleontology (7) Neurons, genes & behavior (8) Molecular ecology & evolution (9) Physiological adaptations
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