Phenological variation in the life histories of amphidromous gobies endemic to the Hawaiian islands

IF 1.6 3区 农林科学 Q3 FISHERIES
Heidi Heim-Ballew, Michael J. Blum, Peter B. McIntyre, Nate Bickford, J. Derek Hogan
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Abstract

Despite the benefits that can come from coordinated movement, many diadromous fishes have evolved partial migration strategies, where a portion of a population does not migrate. Co-occurring life-history variants might nonetheless gain some advantage by exhibiting congruent phenologies, with key events timed to follow the same cue. Here, we assess this possibility by examining otolith microchemistry and structure to quantify the lunar periodicity of hatching and metamorphosis according to migration strategy in a facultative amphidromous goby endemic to Hawai'i. Our analyses corroborated prior evidence that Awaous stamineus exhibits partial migration and that residential A. stamineus are often proportionately more abundant than the migratory form. Contrary to expectation, we found a significant difference in hatching time between migratory and residential A. stamineus. A higher proportion of A. stamineus migrants hatched at the full moon and metamorphosed at the new moon, whereas residents exhibited the opposite phenology. Comparisons to Sicyopterus stimpsoni intended to provide a broader context revealed that the obligately amphidromous species tends to hatch at the new moon and metamorphose at the full moon, mirroring the phenology of residential A. stamineus. Evidence of convergent lunar phenologies suggests that synchronising life-history events can confer benefits that extend beyond species boundaries. Notably, phenological discordance could be acting as a prezygotic isolating barrier between sympatric life-history variants, pointing to the presence of heretofore unrecognised evolutionary diversity within partially migratory species like A. stamineus.

夏威夷群岛特有的两栖虾虎鱼生活史的季节变化
尽管协调运动可以带来好处,但许多溯河鱼类已经进化出部分洄游策略,即部分种群不洄游。然而,共存的生活史变体可能会通过表现出一致的表型而获得某种优势,其关键事件的发生时间遵循相同的线索。在这里,我们通过研究耳石的微化学和结构来评估这种可能性,并根据夏威夷特有的兼性两栖虾虎鱼的迁移策略来量化其孵化和变态的月周期。我们的分析证实了之前的证据,即Awaous stamineus会进行部分洄游,而且栖息的A. stamineus往往比洄游的A. stamineus数量更多。与预期相反的是,我们发现迁徙型和栖息型A. stamineus的孵化时间存在显著差异。在满月时孵化并在新月时蜕变的迁徙型石龙子比例较高,而栖息型石龙子则表现出相反的物候学特征。与Sicyopterus stimpsoni的比较旨在提供一个更广泛的背景,结果表明该两栖物种倾向于在新月孵化,在满月变态,这与居住地A. stamineus的物候学一致。月相趋同的证据表明,生命史事件的同步可以带来超越物种界限的益处。值得注意的是,物候不一致可能会成为同域生活史变体之间的祖先隔离屏障,这表明在部分迁徙物种(如石龙子)中存在着迄今尚未认识到的进化多样性。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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