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A landscape approach towards ecological integrity of catchments and streams

Törnblom, Johan (2008). A landscape approach towards ecological integrity of catchments and streams. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2008:70
ISBN 978-91-86195-03-8
[Doctoral thesis]

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Abstract

Landscape ecology principles were applied to study how in-stream structures as well as terrestrial land cover and land use affect the ecological integrity of streams. Focusing on the role of habitat factors at multiple spatial scales of catchments as independent variables, macroinvertebrates, brown trout (Salmo trutta) and freshwater pearl mussels (Margaritifera margaritifera) were used as dependent response variables. Special efforts were made to capture the range of impacts along the gradient from altered to near-natural catchments in Europe’s centre and north. With 25 catchments in the Carpathian Mountains in Central Europe as a landscape laboratory and a natural experiment design I studied the relationships between catchment land cover composition, riparian vegetation, and in-stream habitat characteristics on the one hand, and benthic macroinvertebrate assemblages on the other. The most important variables were at the terrestrial catchment level. The usefulness of data representing higher taxonomic levels and the use of the abundance of individuals from the orders Ephemeroptera, Plecoptera and Trichoptera, as surrogates for species richness was evaluated. Plecoptera was identified as the most effective group. Comparison of the abundance and taxonomic richness of the Plecoptera order in relation to catchment forest cover and water chemistry demonstrated the occurrence of non-linear response to forest cover. Using Swedish data I showed that it is possible to predict viable freshwater pearl mussel populations from riparian land cover, water chemistry and the abundance of the host fish species (brown trout). In another study a positive effect of woody debris on the abundance and size of brown trout in Swedish forest streams was observed. Altogether these results stress the importance of adopting a multiple scale perspective when assessing ecological integrity in riverine landscapes, from the amount of local in-stream structures as large woody debris (LWD) to the effects of riparian and catchment land cover composition and land use. To support implementation of EU policies about good ecological status a systematic landscape approach including (1) quantification of the ecological integrity concept, and (2) collaborative and communicative bottom-up participatory approaches to spatial planning need to be combined.

Authors/Creators:Törnblom, Johan
Title:A landscape approach towards ecological integrity of catchments and streams
Year of publishing :2008
Volume:2008:70
Number of Pages:74
Papers/manuscripts:
NumberReferences
ALL1) Törnblom, J., Angelstam, P., Degerman, E., Henrikson, L., Edman, T., Temnerud, J. 2007. The relative roles of landscape, riparian and instream factors to macroinvertebrate composition in local catchments: changed country borders as landscape experiments (submitted manuscript). 2) Törnblom, J., Roberge, J-M., Angelstam, P., Rapid assessment of macroinvertebrate species richness in second and third order streams – an evaluation of surrogates across a gradient of land-use intensity in the Carpathian Mountains (manuscript). 3) Törnblom, J., Degerman, E. Angelstam, P. Dose-response relationship using the benthic macroinvertebrate Plecoptera as a bioindicator for ecological integrity of catchments (manuscript). 4) Törnblom, J., Degerman, E. Angelstam, P., Henrikson, L., Söderberg, H., Norrgrann, O., Andersson, K. Predicting occurrence of viable populations of freshwater pearl mussels, Margaritifera margaritifera (L.), in Swedish boreal forest (manuscript). 5) Degerman, E., Sers, B., Törnblom, J., Angelstam, P. (2004). Large woody debris and brown trout in small forest streams – towards targets assessment and management of riparian landscapes. Ecological Bulletins 51:233-239. 6) Törnblom, J., Angelstam, P. Implementing the EU Water Framework Directive: Towards a hierarchical toolbox for achieving Good Ecological Status in riverine landscapes (manuscript).
Place of Publication:Uppsala
ISBN for printed version:978-91-86195-03-8
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:rivers, salmo trutta, riparian zones, watersheds, landscape, ecology, biodiversity, deadwood, freshwater molluscs, plecoptera, indicator animals
Keywords:landscape ecology, ecological integrity, riverine landscapes, riparian zones, large woody debris, ecological status, policy implementation, spatial planning.
URN:NBN:urn:nbn:se:slu:epsilon-2575
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-2575
ID Code:1813
Department:(S) > Dept. of Forest Products
Deposited By: Johan Törnblom
Deposited On:17 Oct 2008 00:00
Metadata Last Modified:02 Dec 2014 10:14

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