Landscape heterogeneity and the biodiversity of Arctic stream communities : a habitat template analysis


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dc.contributor.author Huryn, Alexander D.
dc.contributor.author Slavik, Karie A.
dc.contributor.author Lowe, Rex L.
dc.contributor.author Parker, Stephanie M.
dc.contributor.author Anderson, Dennis S.
dc.contributor.author Peterson, Bruce J.
dc.date.accessioned 2005-12-08T16:02:10Z
dc.date.available 2005-12-08T16:02:10Z
dc.date.issued 2005-08-27
dc.identifier.citation Canadian Journal of Fisheries and Aquatic Sciences 62 (2005): 1905-1919 en
dc.identifier.uri http://hdl.handle.net/1912/232
dc.description Author Posting. © National Research Council Canada, 2005. This article is posted here by permission of National Research Council Canada for personal use, not for redistribution. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences 62 (2005): 1905-1919, doi:10.1139/F05-100.
dc.description.abstract We predicted that substratum freezing and instability are major determinants of the variability of stream community structure in Arctic Alaska. Their effects were conceptualized as a two-dimensional habitat template that was assessed using a natural experiment based on five stream types (mountain-spring, tundra-spring, tundra, mountain, glacier). Detrended correspondence analysis (DCA) indicated distinct macroinvertebrate assemblages for each stream type. The contribution of functional feeding groups to assemblage biomass varied systematically among stream types, indicating that structure and function are linked. Assemblage position within a DCA biplot was used to assess factors controlling its structure. Springs separated from other stream types along a gradient of nutrient concentration and freezing probability. Glacier and mountain streams separated from springs and tundra streams along a gradient of substratum instability and freezing probability. Owing to differences in sources of discharge to streams, the effects of nutrients and substratum stability could not be separated from freezing. Although many factors likely contribute to the variability of Arctic stream communities, the major determinants may be conceptualized as a template structured by gradients in (i) nutrient supply and substratum freezing and (ii) substratum instability and substratum freezing. This template provides a basis for predicting the response of Arctic stream communities to climate change. en
dc.description.sponsorship Funding was provided by grants from the National Science Foundation (NSF DEB-9810222 and NSF OPP-9911278). en
dc.format.extent 992248 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher National Research Council Canada en
dc.relation.uri http://dx.doi.org/10.1139/F05-100
dc.subject Substratum freezing en
dc.subject Nutrient supply en
dc.subject Substratum instability en
dc.title Landscape heterogeneity and the biodiversity of Arctic stream communities : a habitat template analysis en
dc.type Article en
dc.identifier.doi 10.1139/F05-100

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