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Skeletal marine animal biodiversity is built by families with long macroevolutionary lag times.
Nature Ecology & Evolution ( IF 16.8 ) Pub Date : 2020-08-03 , DOI: 10.1038/s41559-020-1265-8
Björn Kröger 1 , Amelia Penny 1
Affiliation  

The clade dynamics of marine animals have changed markedly over the Phanerozoic. Long-term diversification is associated with decreasing origination and extinction rates, and with increasing taxon longevity. Here we use the diversification trajectories of skeletal non-colonial marine families to infer the mechanisms that generated these trends. Suggested mechanisms behind these trends include stochastic extinction of taxa with high evolutionary volatility and selection for traits that buffer against extinction. We find an increasing predominance of Phanerozoic families with long lag times between first appearance and peak diversity, over those with ‘early burst’ diversification trajectories. Long-lag families persisted for longer and had lower evolutionary volatilities, higher genus-level occupancies and genera with larger niche breadths than early burst families. However, they do not preferentially show ecological modes known to protect against extinction. We interpret the rise of the long-lag families as reflecting an intensification of ecosystem-level mechanisms supporting both long-term coexistence and transient dynamics, which increased the capacity of marine ecosystems to accommodate highly diverse communities.



中文翻译:

骨骼海洋动物生物多样性是由长期进化滞后时间较长的家庭建立的。

在生代时期,海洋动物的进化动力学发生了显着变化。长期多样化与减少起源和灭绝速度以及增加分类寿命有关。在这里,我们使用骨骼非殖民地海洋家庭的多样化轨迹来推断产生这些趋势的机制。这些趋势背后的暗示机制包括具有高度进化波动性的分类单元的随机灭绝和缓冲防止灭绝的性状的选择。我们发现,在生代家族中,首次出现与峰的多样性之间有较长的滞后时间的优势比那些具有“早期爆发”的多样化轨迹的家族的优势越来越大。滞后家庭的生存时间更长,进化波动性更低,相较于早期爆发的家庭,更高的属水平占有率和更小的利基宽度属。但是,它们没有优先显示已知的防止灭绝的生态模式。我们将长期滞后的家庭的增加解释为反映了支持长期共存和瞬态动态的生态系统级机制的加强,这增加了海洋生态系统容纳高度多样性社区的能力。

更新日期:2020-08-03
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