Influences of agricultural landuse and seasonal changes in abiotic conditions on invertebrate colonisation of riparian leaf detritus in intermittent streams

Reid, David J., Lake, P. S. and Quinn, Gerry P. 2013, Influences of agricultural landuse and seasonal changes in abiotic conditions on invertebrate colonisation of riparian leaf detritus in intermittent streams, Aquatic sciences, vol. 75, no. 2, pp. 285-297.

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Title Influences of agricultural landuse and seasonal changes in abiotic conditions on invertebrate colonisation of riparian leaf detritus in intermittent streams
Author(s) Reid, David J.
Lake, P. S.
Quinn, Gerry P.
Journal name Aquatic sciences
Volume number 75
Issue number 2
Start page 285
End page 297
Total pages 13
Publisher Birkhaeuser Verlag AG
Place of publication Basel, Switzerland
Publication date 2013-04
ISSN 1015-1621
1420-9055
Keyword(s) detritus
functional feeding group
hydrology
leaf pack
multiple stressor
riparian
Summary The structure and function of agricultural stream reaches with sparse riparian and floodplain vegetation differ from those of forested reaches, but may be ‘reset’ as these streams flow through reaches with forested riparian zones. We investigated whether invertebrate colonisation of River Red Gum (Eucalyptus camaldulensis) leaf packs in lowland intermittent streams was influenced by the adjacent reach-scale landuse (cleared farmland or forested reserve) within an agricultural catchment in Victoria, Australia. Further, we examined the influence of seasonal changes in hydrology and associated changes in abiotic conditions on the colonisation of leaves by repeating experiments over two summers and one spring. Across these experiments, there were no consistent differences in the structure of communities that colonised leaves in farmland and reserve reaches. In both seasons, most leaf colonists were collectors and few were shredders in both farmland and reserve reaches. Relative abundances of gastropod grazers were much higher in summer than in spring. The structure of invertebrate communities colonising leaves in the different reaches converged over time when streams flowed in spring, but diverged over time as the streams dried and abiotic conditions within disconnected pools became increasingly harsh in summer. Thus, patterns of leaf pack colonisation were influenced by the regional climate causing large seasonal changes in hydrology, but not by reach-scale landuse. The large-scale disturbances of agricultural landuse across the catchment and a supra-seasonal drought probably contributed to low diversities of invertebrate communities in the streams.
Language eng
Field of Research 060204 Freshwater Ecology
060202 Community Ecology (excl Invasive Species Ecology)
050102 Ecosystem Function
Socio Economic Objective 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Springer Basel AG
Persistent URL http://hdl.handle.net/10536/DRO/DU:30048803

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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