Document Detail


Effect of climate on the trophic structure of temperate forested streams. a comparison of Mediterranean and Atlantic streams.
MedLine Citation:
PMID:  18048084     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Climate affects many aspects of stream ecosystems, although the presence of riparian forests can buffer differences between streams in different climatic settings. In an attempt to measure the importance of climate, we compared the seasonal patterns of hydrology, input and storage of allochthonous organic matter, and the trophic structure (abundance of algae and macroinvertebrates) in two temperate forested streams, one Mediterranean, the other Atlantic. Hydrology played a leading role in shaping the trophic structure of both streams. Frequency and timing of floods and droughts determined benthic detritus storage. Inputs and retention of allochthonous organic matter were higher in the Atlantic stream, whereas chlorophyll concentration was lower because of stronger light limitation. Instead, light availability and scour of particulate organic matter during late winter favoured higher chlorophyll concentration in the Mediterranean stream. As a result, in the Mediterranean stream grazers were more prevalent and consumers showed a higher dependence on autotrophic materials. On the other hand, the Atlantic stream depended on allochthonous materials throughout the whole study period. The overall trophic structure showed much stronger seasonality in the Mediterranean than in the Atlantic stream, this being the most distinctive difference between these two types of temperate streams. The different patterns observed in the two streams are an indication that climatic differences should be incorporated in proper measurements of ecosystem health.
Authors:
Sergi Sabater; Arturo Elosegi; Vicenç Acuña; Ana Basaguren; Isabel Muñoz; Jesús Pozo
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-12-03
Journal Detail:
Title:  The Science of the total environment     Volume:  390     ISSN:  0048-9697     ISO Abbreviation:  Sci. Total Environ.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2007-12-21     Completed Date:  2008-04-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330500     Medline TA:  Sci Total Environ     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  475-84     Citation Subset:  IM    
Affiliation:
Institute of Aquatic Ecology and Department of Environmental Sciences, University of Girona, Girona 17071, Spain. sergi.sabater@udg.es
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MeSH Terms
Descriptor/Qualifier:
Animals
Atlantic Ocean
Biomass*
Chlorophyll / analysis
Climate
Invertebrates / growth & development
Mediterranean Sea
Principal Component Analysis
Rivers*
Spain
Trees*
Chemical
Reg. No./Substance:
1406-65-1/Chlorophyll; 479-61-8/chlorophyll a

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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