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桑达兰的水生生物群是碎片化的,但不是避难所

Erwan Delrieu-Trottin^1,2,3, Selim Ben Chehida¹, Tedjo Sukmono⁴

¹ISEM, Univ Montpellier, CNRS, IRD, Montpellier, France.

Systematic biology

|March 4, 2025

概括

古老的群岛群岛,如桑达大陆架港湾神秘的鱼类多样性由于范围的碎片化,而不是普莱斯托时代的气候变化. 分子数据揭示了许多隐藏的物种,挑战了以前的生态和进化理论.

科学领域:

生态学和进化生物学.
分子遗传学分子遗传学
生物地理学生物地理学生物地理学

背景情况:

热带岛屿对于理解生态和进化过程至关重要.
普世气候波动被认为是分裂群岛物种分散和多样化的驱动因素.
古老的群岛群岛桑达 (Sunda Shelf) 具有复杂的地质历史,这可能比最近的气候事件更能解释当前的多样性模式.

研究的目的:

调查桑达大陆架上淡水鱼种群碎片化和人口统计历史.
评估地质历史与纪气候变化在塑造岛屿多样性的作用.
探索常见的淡水鱼类物种中的神秘多样性.

主要方法:

六个常见的淡水鱼家族的线粒体DNA测序.
应用物种划界方法对来自188个地点的1,062个序列,确定95个分子操作分类学单位 (MOTU).
使用扩展贝叶斯天际线图和层次的近似贝叶斯计算分析人口碎片化和人口统计历史.

主要成果:

在37种物种中检测到95个分子操作分类学单位 (MOTU).
广泛分布的物种表现出1到11个MOTU,与时间相对应到最近的共同祖先.
在MOTU中没有发现过去有效人口规模的显著变化,人口统计学推断不支持难民起源.

结论:

祖先种群的范围碎片化是桑达海神秘多样性的主要驱动因素.
世气候波动似乎对这些鱼群的人口统计历史的影响有限.
桑达大陆架的漫长地质历史为了解其岛屿生物多样性提供了更强大的框架.

关键词:

燃烧分析分析燃烧分析.遗传树遗传树遗传树遗传树线粒体基因组的基因组过去的有效人口规模.模拟是通过模拟进行的.

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Formation of Species

Formation of Species

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Speciation Rates

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Production Efficiency

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.