Dispersal in drift-prone macroinvertebrates: a case for density-independence

Humphries, Stuart (2002) Dispersal in drift-prone macroinvertebrates: a case for density-independence. Freshwater Biology, 47 (5). pp. 921-929. ISSN 0046-5070

Full content URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00819.x

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Item Type:Article
Item Status:Live Archive

Abstract

1. Studies of dispersal of macroinvertebrates in streams and rivers tend to be focused on drift, whilst benthic movements are usually considered to be less important. 2. Field-enclosure experiments with the mayfly Baetis rhodani indicate that net dispersal in this species is simply a proportional loss of individuals from the benthos. 3. Neither net upstream or downstream movements exhibited evidence of density-dependence in the form of curvilinear relationships between initial and final densities. 4. The net number of animals moving upstream did not differ significantly from the net number moving downstream. 5. The probable mechanisms behind density-independent dispersal are discussed, as are the implications for our understanding of population dynamics in relation to invertebrate drift.

Keywords:density dependence, dispersal, freshwater ecosystem, macroinvertebrate, population dynamics, Animalia, Baetis, Baetis rhodani, Ephemeroptera, Invertebrata
Subjects:C Biological Sciences > C162 Freshwater Biology
Divisions:College of Science > School of Life Sciences
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ID Code:15276
Deposited On:14 Nov 2014 11:06

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