Mixing of supersaturated assemblages and the precipitous loss of species

The American Naturalist
Daniel Roelke, Peter M Eldridge

Abstract

Mechanisms influencing species richness are many. Recent theoretical research revealed additional mechanisms that involved neutral and lumpy coexistence and alternating assemblage states. These mechanisms can lead to conditions where the number of coexisting species is greater than the number of limiting resources, that is, species supersaturation. Our research focused on the role of disturbances (migration and pulsed through-flows) in supersaturated plankton systems. Our simulations employed 30 different supersaturated assemblages generated by using various ecological principals. Our findings indicated that immigration rates as low as 0.1% of total biomass per day generally led to regional homogenization of species and dramatic extinction events, with assemblages characteristic of lumpy coexistence being more resilient than those characteristic of neutral coexistence or alternating states. Generally, pulsed through-flows tended to offset, to some extent, the negative effects of migration. The precipitous loss of species with the onset of migration is observed in other systems as well, for example, cichlid fish communities of East Africa rift lakes and songbird assemblages from Indian Ocean islands. While many explanations have...Continue Reading

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Citations

Mar 25, 2015·PloS One·Daniel L Roelke, Sofie Spatharis
Aug 16, 2016·Ecology and Evolution·Toni KlauschiesUrsula Gaedke
Mar 24, 2015·PloS One·Daniel L Roelke, Sofie Spatharis
Jan 23, 2019·PLoS Computational Biology·Rafael D'AndreaAnnette M Ostling
Dec 14, 2018·Oecologia·Josie Antonucci Di Carvalho, Stephen A Wickham

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