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Spatiotemporal variability of chemistry and biota in boreal surface waters

a multiscale analysis of patterns and processes

Stendera, Sonja (2005). Spatiotemporal variability of chemistry and biota in boreal surface waters. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2005:95
ISBN 91-576-6994-5
[Doctoral thesis]

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Abstract

This thesis focuses on the assessment of spatial and temporal patterns of freshwater communities in relation to spatial variability and changes of the abiotic environment (i.e. water chemistry). The importance of geographic position, regional- and local-scale factors as drivers of the natural variability of lake and stream water chemistry was quantified and compared by variance partitioning using partial redundancy analysis. A major part of surface water chemistry was explained by interactions between geographic, regional and local factors. Streams and lakes were similar in their response, indicating that idiosyncrasies of both systems might be suppressed by effects of large-scale factors, in particular, if human-induced catchment variation generates a high amount of environmental noise. Regional processes are also important in structuring the composition of local communities. The relationship between local and regional diversity across three spatial scales and the importance of regional and local factors on macroinvertebrate diversity patterns was determined using the additive partitioning concept. Local processes (i.e. habitat heterogeneity) were an important factor contributing to species coexistence resulting in saturating patterns of the communities. On the other hand, local variability may confound the ability to detect perturbation or recovery. A multihabitat analysis of the rates and trajectories of recovery of acidified lakes as well as persistence of pelagic and benthic communities of acidified and reference lakes showed that recovery is a complex and challenging process, influenced by multiple spatial and temporal factors. For instance, climate-induced changes in surface runoff patterns may introduce significant variability in surface water chemistry confounding recovery and influencing the persistence and stability of freshwater communities. As focus is shifting from single-site to regional management of freshwater ecosystems, it is important that policy makers and managers are aware of which factors on which scale are most influencing water quality and biodiversity. The results of this thesis show that a holistic, multiscale analysis, involving several habitats and biotic indicators, is needed to understand ecosystem response to large-scale, regional stressors so as to best protect the world’s most precious and vital resource - freshwater.

Authors/Creators:Stendera, Sonja
Title:Spatiotemporal variability of chemistry and biota in boreal surface waters
Subtitle:a multiscale analysis of patterns and processes
Year of publishing :October 2005
Volume:2005:95
Number of Pages:39
Papers/manuscripts:
NumberReferences
ALLI.Stendera, S. & Johnson, R. K. Multi-scale drivers of water chemistry of boreal lakes and streams. (Accepted in Environmental Management). II. Stendera, S. & Johnson, R. K. 2005. Additive partitioning of aquatic invertebrate species diversity across multiple spatial scales. Freshwater Biology 50, 1360-1375. III. Stendera, S. & Johnson, R.K. Recovery trends of phytoplankton and benthic macroinvertebrate communities in acidified and reference boreal lakes – a multihabitat assessment. (Submitted). IV. Stendera, S. & Johnson, R.K. Stability and persistence of phytoplankton and benthic macroinvertebrate communities in acidified and reference boreal lakes. (Manuscript).
Place of Publication:Uppsala
ISBN for printed version:91-576-6994-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:T Pollution > T01 Pollution
P Natural resources > P10 Water resources and management
Subjects:Not in use, please see Agris categories
Agrovoc terms:freshwater, surface water, lakes, rivers, water conservation, aquatic environment, environmental factors, acidification, biota, phytoplankton, sweden
Keywords:spatiotemporal variability, streams, lakes, water chemistry, benthic macroinvertebrates, phytoplankton, multiple scales, multihabitat, acidification, recovery, persistence.
URN:NBN:urn:nbn:se:slu:epsilon-764
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-764
ID Code:956
Department:(NL, NJ) > Dept. of Environmental Assessment
Deposited By: Sonja Stendera
Deposited On:13 Oct 2005 00:00
Metadata Last Modified:02 Dec 2014 10:08

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