Increase in predator-prey size ratios throughout the Phanerozoic history of marine ecosystems

Increase in predator-prey size ratios throughout the Phanerozoic history of marine ecosystems
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在整个显生宙海洋生态系统历史中,捕食者与猎物的体型比不断增加

DOI:
10.1126/science.aam7468
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发表时间:
2017
期刊:
影响因子:
56.9
通讯作者:
Finnegan, Seth
Finnegan, Seth
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Klompmaker, Adiël A.;Kowalewski, Michał;Huntley, John Warren;Finnegan, Seth

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升级假说认为,越来越强大和代谢活跃的食肉动物的捕食一直是后生动物进化的主要驱动力。我们通过分析海洋贝壳化石中的捕食性钻孔来检验这一假设的关键原理,这些钻孔提供了大约5亿年来个体捕食者-猎物相互作用的记录。我们发现,钻孔大小是现代钻探捕食者身体大小的可靠预测指标,从奥陶纪到第四纪,钻孔大小(由此推断的捕食者大小和威力)显著增加,而钻探猎物的大小保持稳定。总而言之,这些趋势表明捕食者-猎物大小比例有方向性的增加。我们假设,捕食者-猎物大小比率的增加反映了猎物丰度、猎物营养含量的增加,以及捕食者之间的捕食。
The escalation hypothesis posits that predation by increasingly powerful and metabolically active carnivores has been a major driver of metazoan evolution. We test a key tenet of this hypothesis by analyzing predatory drill holes in fossil marine shells, which provide a ~500-million-year record of individual predator-prey interactions. We show that drill-hole size is a robust predictor of body size among modern drilling predators and that drill-hole size (and thus inferred predator size and power) rose substantially from the Ordovician to the Quaternary period, whereas the size of drilled prey remained stable. Together, these trends indicate a directional increase in predator-prey size ratios. We hypothesize that increasing predator-prey size ratios reflect increases in prey abundance, prey nutrient content, and predation among predators.
DOI: 10.1126/science.224.4644.78
发表时间: 1984-01-01
期刊: SCIENCE
影响因子: 56.9
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