Disturbance, biological legacies and community development in stream mesocosms.

Oecologia
Mark E LedgerPatrick D Armitage

Abstract

Disturbances reduce the biota in stream ecosystems, and leave biological legacies, including remnant species, which potentially influence post-disturbance community development but are poorly understood. We investigated whether three remnant species, the snail Radix peregra, the mayfly Serratella ignita and the freshwater shrimp Gammarus pulex, affected community development in mesocosms that mimicked disturbed habitat patches in streams. Following 21 days of colonisation, we found that the occurrence of legacy effects depended on the identity of the remnant species. Radix had the strongest effect. By bulldozing epilithon, the snails acted as ecological engineers that promoted settlement of filter feeders (Simuliidae) and invertebrate predators (especially Pentaneura and Aphelocheirus) and strongly deterred settlement of non-predatory chironomids (e.g. Heterotrissocladius and Microtendipes). Gammarus increased in density (by 665%) where remnant, probably through rapid reproduction. Baetis and Pentaneura were scarce, and Asellus absent, in remnant Gammarus treatments, as a consequence of interference and/or predation by the amphipods. In contrast, Serratella tolerated the colonisation of immigrant species and did not affect the ...Continue Reading

References

May 1, 1990·Trends in Ecology & Evolution·J A Drake
Nov 1, 1997·Trends in Ecology & Evolution·C L Samuels, J A Drake
Jun 1, 1991·Oecologia·Christer BrönmarkAnn Erlandsson
Jan 1, 1989·Evolution; International Journal of Organic Evolution·William R Rice

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Citations

Jan 15, 2008·Oecologia·Mark E LedgerAlexander M Milner
Nov 28, 2014·Biological Reviews of the Cambridge Philosophical Society·Stephanie A PulsfordDon A Driscoll
Jun 28, 2016·The Science of the Total Environment·Lee E BrownJoseph Holden
Nov 8, 2018·Current Zoology·Timothy A C GordonUNKNOWN Handling editor: David Bierbach
Aug 8, 2021·The Journal of Animal Ecology·Lawrence J B EagleLee E Brown

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