Maximum gonad investment reveals male bias when temperature decreases or latitude increases for a broadcast-spawning intertidal chiton (Polyplacophora: Chitonida)

IF 2.2 3区生物学 Q1 MARINE & FRESHWATER BIOLOGY

Hydrobiologia Pub Date : 2024-07-22 DOI:10.1007/s10750-024-05650-y

Isis Laura Alvarez-Garcia, Quetzalli Yasu Abadia-Chanona, Marcial Arellano-Martinez, Omar Hernando Avila-Poveda

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Abstract

Appraising sexual asymmetry during maximum gonad investment (MGI) offers a sharp tool to evaluate the reproductive response of species to climate by coupling extrinsic and intrinsic factors. We comparatively analyze how the mass and physiological male and female gonad investments of the broadcast-spawning intertidal Chiton articulatus in two populations from the Mexican Tropical Pacific respond to the thermal phases of cold “La Niña” and warm “El Niño.” We found that local rather than regional temperature modulates MGI intensity and breadth in this species, evidencing higher MGI levels in the southern tropical zone (Oaxaca). Male gonad investment was higher than that of females during neutral and cold phases compared to warm thermal phases. Physiological gonad investment during MGI suggests that males spawn before females, and the adult sex ratio of each population was close to unity. Our results suggest reproductive success regulation through sexual asymmetry in both mass and physiological gonad investment, modulated by temperature changes due to thermal phases. The male bias in gonad investment found under neutral to cold temperatures suggests physiological resilience in this species, especially considering its habitat and the impact of climate change· The MGI value is a phenotypic trait that varies as a function of temperature.

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当温度降低或纬度升高时，潮间带产卵甲壳动物（多孔甲壳动物：甲壳纲）的最大性腺投资显示出雄性偏好

通过将外在和内在因素结合起来，评估最大性腺投资（MGI）期间的性不对称为评估物种对气候的生殖反应提供了一个锐利的工具。我们比较分析了墨西哥热带太平洋两个种群中潮间带蓟马（Chiton articulatus）广布产卵雌雄性腺的质量和生理投资如何对寒冷的 "拉尼娜 "和温暖的 "厄尔尼诺 "热阶段做出反应。我们发现，当地温度而非区域温度会调节该物种的MGI强度和广度，证明南部热带地区（瓦哈卡）的MGI水平较高。与暖热阶段相比，雄性性腺投资在中性和寒冷阶段高于雌性性腺投资。MGI期间的生理性腺投资表明雄性在雌性之前产卵，每个种群的成年性别比接近统一。我们的研究结果表明，生殖成功率的调节是通过质量和生理性腺投资的性不对称来实现的，并受热阶段温度变化的调节。在中性至低温条件下发现的雄性性腺投资偏向表明该物种具有生理恢复能力，特别是考虑到其栖息地和气候变化的影响--MGI值是一种表型特征，随温度变化而变化。

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来源期刊

Hydrobiologia 生物-海洋与淡水生物学

CiteScore

5.40

自引率

11.50%

发文量

288

审稿时长

4.9 months

期刊介绍： Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.