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研究揭示快速生长型珊瑚礁鱼类的演化
2023-05-26 15:43

澳大利亚詹姆斯库克大学Alexandre C. Siqueira等研究人员揭示快速生长型珊瑚礁鱼类的演化。2023年5月17日,《自然》杂志在线发表了这项成果。

研究人员分析了一个高度多样化的脊椎动物群——珊瑚礁鱼的生长演变。研究人员将最先进的极端梯度提升回归树与系统发育比较方法结合起来,检测体细胞生长的适应性机制的时间、数量、位置和变化幅度。研究人员还探讨了体型和生长之间的异速关系的演变。结果表明,珊瑚鱼快速生长轨迹的演化比缓慢生长轨迹的演化要普遍得多。许多珊瑚鱼品系在始新世(5600-3390万年前)转向更快的生长和更小的体型的演化选择,表明在这个时代生活史策略的重大扩展。在所有被研究的品系中,小体型、高周转的隐杆鱼向极高的生长优化转变得最多,即使在考虑了体型异质性之后。

这些结果表明,始新世的全球高温和随后的栖息地重组可能对现代珊瑚礁生态系统所特有的高产、高周转的鱼类群落的兴起和保留至关重要。

据介绍,个体生长是一个基本的生命史特征,但对整个动物群的宏观演化轨迹却很少进行研究。

附:英文原文

Title: The evolution of fast-growing coral reef fishes

Author: Siqueira, Alexandre C., Yan, Helen F., Morais, Renato A., Bellwood, David R.

Issue&Volume: 2023-05-17

Abstract: Individual growth is a fundamental life history trait1,2,3,4, yet its macroevolutionary trajectories have rarely been investigated for entire animal assemblages. Here we analyse the evolution of growth in a highly diverse vertebrate assemblage—coral reef fishes. We combine state-of-the-art extreme gradient boosted regression trees with phylogenetic comparative methods to detect the timing, number, location and magnitude of shifts in the adaptive regime of somatic growth. We also explored the evolution of the allometric relationship between body size and growth. Our results show that the evolution of fast growth trajectories in reef fishes has been considerably more common than the evolution of slow growth trajectories. Many reef fish lineages shifted towards faster growth and smaller body size evolutionary optima in the Eocene (56–33.9million years ago), pointing to a major expansion of life history strategies in this Epoch. Of all lineages examined, the small-bodied, high-turnover cryptobenthic fishes shifted most towards extremely high growth optima, even after accounting for body size allometry. These results suggest that the high global temperatures of the Eocene5 and subsequent habitat reconfigurations6 might have been critical for the rise and retention of the highly productive, high-turnover fish faunas that characterize modern coral reef ecosystems.

DOI: 10.1038/s41586-023-06070-z

Source: https://www.nature.com/articles/s41586-023-06070-z

Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:69.504
官方网址:http://www.nature.com/
投稿链接:http://www.nature.com/authors/submit_manuscript.html


本期文章:《自然》:Online/在线发表

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