Fertilization modes drive the evolution of sperm traits in Baikal sculpins
Fertilization modes drive the evolution of sperm traits in Baikal sculpins
复制标题
受精模式驱动贝加尔杜父鱼精子性状的进化
DOI：
10.1111/jzo.12867
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发表时间：
2021
影响因子：
2
通讯作者：
Awata S.
中科院分区：
文献类型：
--
作者：
Ito T.;Kinoshita I.;Tahara D.;Goto A.;Tojima S.;Sideleva V. G.;Kupchinsky A. B.;Awata S.
贝加尔湖雕刻鱼是一种独特的鱼类，包括外部和内部受精的物种。精子的形态和运动等性状，预计会因物种受精方式而发生适应性变化。然而，在贝加尔湖雕塑中探索这些特征的研究是缺乏的。本研究对三种体外受精的石雕（cotocomphorus grewingkii,Leocottus kessleriiand paracotus knerii）和一种内受精的石雕（comphorus dybowskii）的精子性状进行了实地研究。两种受精种的精子头形态均为球形；然而，内施化肥的精子头部横截面积小于外施化肥。这一结果暗示精子头部形态可能适应于在粘稠的卵巢液体中游动。内部肥料C。可能是由于不同的精子竞争水平，与外部肥料相比，Dybowskii的精子游得更长、更快，运动时间更长。内施肥料的精子仅在等渗溶液中具有运动能力，而外施肥料的精子在湖水中具有运动能力，这表明精子的运动能力是根据其外部/内部环境而特化的。据我们所知，这是第一个证明贝加尔湖雕塑的精子特征的研究，这些特征可能随着受精模式的变化而进化。
Baikal sculpins are a unique group of fishes, including both externally and internally fertilizing species. Sperm traits, such as morphology and motility, are predicted to undergo adaptive changes due to species fertilization modes. However, studies exploring such traits in Baikal sculpins are lacking. Here, we conducted a field study and investigated sperm traits of three sculpins with external fertilization (Cottocomephorus grewingkii,Leocottus kessleriiandParacottus knerii) and one sculpin with internal fertilization (Comephorus dybowskii). Sperm head morphology was spherical in both types of fertilizing species; however, the head cross‐sectional area of the sperm of the internal fertilizer was smaller than that of external fertilizers. This result implies that sperm head morphology might be adapted to swim in a viscous ovarian fluid. The internal fertilizer,C. dybowskii,had longer and faster‐swimming sperms with longer motility duration than the external fertilizers, perhaps due to different sperm competition levels. Sperms of the internal fertilizer were only motile in isotonic solutions, whereas sperms of the external fertilizers were motile in lake waters, suggesting that sperm motilities are specialized according to their external/internal environments. To our knowledge, this is the first study to demonstrate sperm traits of Baikal sculpins, which may have evolved adaptively along with changing fertilization modes.