Sharks Violate Rensch's Rule for Sexual Size Dimorphism.

IF 2.2 4区 生物学 Q2 BIOLOGY
Integrative Organismal Biology Pub Date : 2024-07-04 eCollection Date: 2024-01-01 DOI:10.1093/iob/obae025
J H Gayford, P C Sternes
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Abstract

Systematic trends in body size variation exist in a multitude of vertebrate radiations, however their underlying ecological and evolutionary causes remain poorly understood. Rensch's rule describes one such trend-in which the scaling of sexual size dimorphism (SSD) depends on which sex is larger. Where SSD is male-biased, SSD should scale hyperallometrically, as opposed to hypoallometrically where SSD is female-biased. The evidence for Rensch's rule is mixed, and comes from a small subset of total vertebrate diversity. We conducted the first empirical test of Rensch's rule in sharks, seeking to confirm or refute a long-hypothesied trend. We find that sharks violate Rensch's rule, as the magnitude of SSD increases with body size despite sharks predominantly exhibiting female-biased SSD. This adds to a growing literature of vertebrate clades that appear not to follow Rensch's rule, suggesting the absence of a single, conserved scaling trend for SSD amongst vertebrates. It is likely that selection associated with fecundity results in the "inverse Rensch's rule" observed in sharks, although additional studies will be required to fully reveal the factors underlying SSD variation in this clade.

鲨鱼违反了伦施的性别大小二形性规则。
在许多脊椎动物的演化过程中都存在着体型变化的系统趋势,但人们对其背后的生态和进化原因仍然知之甚少。伦施法则描述了这样一种趋势--性别体型二形性(SSD)的比例取决于哪种性别的体型更大。当 SSD 偏重于雄性时,SSD 应按高allometrically 比例缩放,而当 SSD 偏重于雌性时,SSD 则按低allometrically 比例缩放。伦施规则的证据不一,而且只来自脊椎动物多样性的一小部分。我们首次在鲨鱼中对伦施规则进行了实证检验,试图证实或反驳长期以来推测的趋势。我们发现鲨鱼违反了伦施规则,因为尽管鲨鱼主要表现出偏向雌性的 SSD,但随着体型的增大,SSD 的幅度也会增大。越来越多的脊椎动物支系似乎并不遵循伦施规则,这为我们提供了更多的资料,表明脊椎动物中并不存在单一的、保守的SSD缩放趋势。与繁殖力相关的选择可能导致了在鲨鱼中观察到的 "反伦施规则",尽管还需要更多的研究来充分揭示该支系中SSD变异的基本因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.70
自引率
6.70%
发文量
48
审稿时长
20 weeks
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