Яндекс.Метрика

A.D.Muscente,T.H.Boag, N. Bykova,J.D.Schiffbauer

Том: Earth-Science Reviews
Том: 177 , Год издания: 2018
Многотомное издание: Earth-Science Reviews
Страницы: 248-264

Аннотация

The radiation of early animals involved dramatic turnover of both eukaryotic life and marine environments, but the factors that drove origination and extinction of taxa remain controversial. Herein, we review current interpretations and uncertainties regarding changes in biodiversity through the Ediacaran Period. Overall, ocean oxygenation and/or ecological restructuring of ecosystems may have driven biologic turnover over time. To explore these possibilities, we provide a conceptual model, rooted in ecological theory, which holistically describes biodiversity change in terms of environmental disturbance frequency/intensity and essential resource availability. In light of this framework, we evaluate two potential drivers of turnover: evolution of mobile animals and the Shuram negative carbon isotope excursion event. Early trace-making bilaterians-acting as a control on substrate stability and microbial release of dissolved organic carbon (DOC; an essential resource for osmotrophic organisms with nutrient-dependent growth)-may have played key roles in both the diversification and disappearance of the Ediacara biota.
индекс в базе ИАЦ: 049385