Sperm competition, sexual selection and the diverse reproductive biology of Osteoglossiformes
Sperm competition, sexual selection and the diverse reproductive biology of Osteoglossiformes
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骨舌目的精子竞争、性选择和多样化的生殖生物学
DOI：
10.1111/jfb.14779
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发表时间：
2021
影响因子：
2
通讯作者：
Gallant, Jason R.
中科院分区：
文献类型：
--
作者：
Koenig, Lauren A.;Gallant, Jason R.
骨舌形目（英语：Osteoglossiformes）是一个“骨舌”鱼类的目，被认为是硬骨鱼类中最原始的现存目。这篇综述旨在巩固已知的假设，并确定文献中的差距，在精子竞争和更广泛的透镜的性选择的背景下，不同的生殖特征和行为的骨舌形动物的适应意义。骨舌形目的许多不寻常的特征表明精子竞争水平较低;大多数物种具有不配对的性腺，而拟骨舌形目是唯一已知的具有无鞭毛精子的脊椎动物物种。几个骨舌形家族具有与内部受精相关的生殖解剖学，但进行外部受精，这可能代表了从外部到内部受精的进化过渡以及精子竞争和环境之间的假定权衡。它们还使用脊椎动物中的每一种父母照顾方式。骨舌形动物在地理上广泛分布，基本位于硬骨鱼类，提出了一个有效的研究系统，了解精子竞争和性选择如何塑造硬骨鱼类生殖行为，精子和性腺形态，受精策略，求爱和父亲的照顾，和性冲突的演变。作者认为，在骨舌形生殖中看到的模式是硬骨鱼生殖多样性的一个缩影，可能意味着遗传可塑性，有助于硬骨鱼的适应性辐射。
Osteoglossiformes are an order of “bony tongue” fish considered the most primitive living order of teleosts. This review seeks to consolidate known hypotheses and identify gaps in the literature regarding the adaptive significance of diverse reproductive traits and behaviour of osteoglossiforms within the context of sperm competition and the wider lens of sexual selection. Many of the unusual traits observed in osteoglossiforms indicate low levels of sperm competition; most species have unpaired gonads, and mormyroids are the only known vertebrate species with aflagellate sperm. Several osteoglossiform families have reproductive anatomy associated with internal fertilization but perform external fertilization, which may be representative of the evolutionary transition from external to internal fertilization and putative trade‐offs between sperm competition and the environment. They also employ every type of parental care seen in vertebrates. Geographically widespread and basally situated within teleosts, osteoglossiforms present an effective study system for understanding how sperm competition and sexual selection have shaped the evolution of teleost reproductive behaviour, sperm and gonad morphology, fertilization strategies, courtship and paternal care, and sexual conflict. The authors suggest that the patterns seen in osteoglossiform reproduction are a microcosm of teleost reproductive diversity, potentially signifying the genetic plasticity that contributed to the adaptive radiation of teleost fishes.