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Stream ecosystem functioning in an agricultural landscape: the importance of terrestrial-aquatic linkages
University College Cork, Department of Zoology.
University College Cork, Department of Zoology.
Université de Toulouse.
Manchester Metropolitan University.
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2011 (English)In: Ecosystems in a human-modified landscape: a European perspective / [ed] Guy Woodward, San Diego: Academic Press, 2011, Vol. 44, 211-276 p.Chapter in book (Refereed)
Abstract [en]

The loss of native riparian vegetation and its replacement with non-native species or grazing land for agriculture is a worldwide phenomenon, but one that is prevalent in Europe, reflecting the heavily-modified nature of the continent's landscape. The consequences of these riparian alterations for freshwater ecosystems remain largely unknown, largely because bioassessment has traditionally focused on the impacts of organic pollution on community structure. We addressed the need for a broader perspective, which encompasses changes at the catchment scale, by comparing ecosystem processes in woodland reference sites with those with altered riparian zones. We assessed a range of riparian modifications, including clearance for pasture and replacement of woodland with a range of low diversity plantations, in 100 streams to obtain a continental-scale perspective of the major types of alterations across Europe. Subsequently, we focused on pasture streams, as an especially prevalent widespread riparian alteration, by characterising their structural (e.g. invertebrate and fish communities) and functional (e.g. litter decomposition, algal production, herbivory) attributes in a country (Ireland) dominated by this type of landscape modification, via field and laboratory experiments. We found that microbes became increasingly important as agents of decomposition relative to macrofauna (invertebrates) in impacted sites in general and in pasture streams in particular. Resource quality of grass litter (e.g., carbon : nutrient ratios, lignin and cellulose content) was a key driver of decomposition rates in pasture streams. These systems also relied more heavily on autochthonous algal production than was the case in woodland streams, which were more detrital based. These findings suggest that these pasture streams might be fundamentally different from their native, ancestral woodland state, with a shift towards greater reliance on autochthonous-based processes. This could have a destabilizing effect on the dynamics of the food web relative to the slower, detrital-based pathways that dominate in woodland streams.

Place, publisher, year, edition, pages
San Diego: Academic Press, 2011. Vol. 44, 211-276 p.
Series
Advances in ecological research, ISSN 0065-2504 ; 44
Keyword [en]
leaf-litter decomposition, fresh-water ecosystems, complex food-web, riparian vegetation, community structure, headwater streams, new-zealand, land-use, contrasting responses, breakdown rates
National Category
Ecology
Identifiers
URN: urn:nbn:se:hkr:diva-8796DOI: 10.1016/B978-0-12-374794-5.00004-3ISI: 000293800600005ISBN: 978-0-12-374794-5 (print)OAI: oai:DiVA.org:hkr-8796DiVA: diva2:462226
Note

ISI: 000293800600005

Available from: 2011-12-06 Created: 2011-12-06 Last updated: 2015-05-12Bibliographically approved

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Lacoursière, Jean O.Vought, Lena B. M.
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School of Education and Environment
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
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  • vancouver
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More styles
Language
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