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Floodplain connectivity, disturbance and change: a palaeoentomological investigation of floodplain ecology from south-west England

Floodplain connectivity, disturbance and change: a palaeoentomological investigation of floodplain ecology from south-west England
Floodplain connectivity, disturbance and change: a palaeoentomological investigation of floodplain ecology from south-west England
1. Floodplain environments are increasingly subject to enhancement and restoration, with the purpose of increasing their biodiversity and returning them to a more 'natural' state. Defining such a state based solely upon neoecological data is problematic and has led several authors to suggest the use of a palaeoecological approach.
2. Fossil Coleopteran assemblages recovered from multiple palaeochannel fills in south-west England were used to investigate past floodplain and channel characteristics during the mid- to late-Holocene. Ordination of coleopteran data was performed using Detrended Correspondence Analysis (DCA) and produced clear and discrete clustering. This clustering pattern is related to the nature of the environment in which assemblages were deposited and hence channel configuration and dynamics.
3. The DCA clustering pattern is strongly related to measures of ecological evenness, and a strong relationship between these indices and the composition of the water beetle assemblage within samples was revealed. Repeating the ordination with presence–absence data results in a similar pattern of clustering, implying that assemblage composition is crucial in determining cluster placement.
4. As assemblage composition is primarily a function of floodplain topography and hence disturbance regime, we attempt to relate these data to the Intermediate Disturbance Hypothesis (IDH). A significant positive correlation was found between ecological diversity (Shannon's H') and Axis 1 of all ordinations in predominantly aquatic assemblages.
coleoptera, detrended correspondence analysis, ecological baselines, floodplain ecology, floodplain restoration, palaeoecology
0021-8790
276-288
Davis, S.R.
8e3105e6-1f2d-4275-9763-408c70d269a0
Brown, A.G.
c51f9d3e-02b0-47da-a483-41c354e78fab
Dinnin, M.H.
c24b2ec5-4935-48c2-8ff0-994737dc4877
Davis, S.R.
8e3105e6-1f2d-4275-9763-408c70d269a0
Brown, A.G.
c51f9d3e-02b0-47da-a483-41c354e78fab
Dinnin, M.H.
c24b2ec5-4935-48c2-8ff0-994737dc4877

Davis, S.R., Brown, A.G. and Dinnin, M.H. (2007) Floodplain connectivity, disturbance and change: a palaeoentomological investigation of floodplain ecology from south-west England Journal of Animal Ecology, 76, (2), pp. 276-288. (doi:10.1111/j.1365-2656.2006.01209.x).

Record type: Article

Abstract

1. Floodplain environments are increasingly subject to enhancement and restoration, with the purpose of increasing their biodiversity and returning them to a more 'natural' state. Defining such a state based solely upon neoecological data is problematic and has led several authors to suggest the use of a palaeoecological approach.
2. Fossil Coleopteran assemblages recovered from multiple palaeochannel fills in south-west England were used to investigate past floodplain and channel characteristics during the mid- to late-Holocene. Ordination of coleopteran data was performed using Detrended Correspondence Analysis (DCA) and produced clear and discrete clustering. This clustering pattern is related to the nature of the environment in which assemblages were deposited and hence channel configuration and dynamics.
3. The DCA clustering pattern is strongly related to measures of ecological evenness, and a strong relationship between these indices and the composition of the water beetle assemblage within samples was revealed. Repeating the ordination with presence–absence data results in a similar pattern of clustering, implying that assemblage composition is crucial in determining cluster placement.
4. As assemblage composition is primarily a function of floodplain topography and hence disturbance regime, we attempt to relate these data to the Intermediate Disturbance Hypothesis (IDH). A significant positive correlation was found between ecological diversity (Shannon's H') and Axis 1 of all ordinations in predominantly aquatic assemblages.

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More information

Published date: March 2007
Keywords: coleoptera, detrended correspondence analysis, ecological baselines, floodplain ecology, floodplain restoration, palaeoecology

Identifiers

Local EPrints ID: 63712
URI: http://eprints.soton.ac.uk/id/eprint/63712
ISSN: 0021-8790
PURE UUID: 7df46e02-288a-4ac4-b02e-22f9fd516cd0

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Date deposited: 24 Oct 2008
Last modified: 17 Jul 2017 14:16

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Author: S.R. Davis
Author: A.G. Brown
Author: M.H. Dinnin

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