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Global patterns of distribution in stream detritivores: implications for biodiversity loss in changing climates

Boyero, Luz and Pearson, Richard G. and Dudgeon, David and Ferreira, Verónica and Graça, Manuel A. S. and Gessner, Mark O. and Boulton, Andrew J. and Chauvet, Eric and Yule, Catherine M. and Albariño, Ricardo J. and Ramírez, Alonso and Helson, Julie E. and Callisto, Marcos and Arunachalam, Muthukumarasamy and Chará, Julián and Figueroa, Ricardo and Mathooko, Jude M. and Gonçalves, José F. Jr and Moretti, Marcelo S. and Chará-Serna, Ana Marcela and Davies, Judy N. and Encalada, Andrea C. and Lamothe, Sylvain and Buria, Leonardo M. and Castela, José and Cornejo, Aydeé and Li, Aggie O. Y. and M'Erimba, Charles and Villanueva, Verónica Díaz and Zúñiga, Maria del Carmen and Swan, Christopher M. and Barmuta, Leon A. Global patterns of distribution in stream detritivores: implications for biodiversity loss in changing climates. (2012) Global Ecology and Biogeography, 21. 134-141. ISSN 1466-822X

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Official URL: http://dx.doi.org/10.1111/j.1466-8238.2011.00673.x


Aim. We tested the hypothesis that shredder detritivores, a key trophic guild in stream ecosystems, are more diverse at higher latitudes, which has important ecological implications in the face of potential biodiversity losses that are expected as a result of climate change. We also explored the dependence of local shredder diversity on the regional species pool across latitudes, and examined the influence of environ- mental factors on shredder diversity. Location: World-wide (156 sites from 17 regions located in all inhabited continents at latitudes ranging from 67° N to 41° S). Methods: We used linear regression to examine the latitudinal variation in shredder diversity at different spatial scales: alpha (a), gamma (g) and beta (b) diversity. We also explored the effect of g-diversity on a-diversity across latitudes with regression analysis, and the possible influence of local environmental factors on shredder diversity with simple correlations. Results: Alpha diversity increased with latitude, while g- and b-diversity showed no clear latitudinal pattern. Temperate sites showed a linear relationship between g- and a-diversity; in contrast, tropical sites showed evidence of local species saturation, which may explain why the latitudinal gradient in a-diversity is not accompanied by a gradient in g-diversity. Alpha diversity was related to several local habitat characteristics, but g- and b-diversity were not related to any of the environmental factors measured. Main conclusions: Our results indicate that global patterns of shredder diversity are complex and depend on spatial scale. However, we can draw several conclusions that have important ecological implications. Alpha diversity is limited at tropical sites by local factors, implying a higher risk of loss of key species or the whole shredder guild (the latter implying the loss of trophic diversity). Even if regional species pools are not particularly species poor in the tropics, colonization from adjacent sites may be limited. Moreover, many shredder species belong to cool-adapted taxa that may be close to their thermal maxima in the tropics, which makes them more vulnerable to climate warming. Our results suggest that tropical streams require specific scientific attention and conservation efforts to prevent loss of shredder biodiversity and serious alteration of ecosystem processes.

Item Type:Article
Additional Information:Thanks to Wiley editor. The original publication is available at http://onlinelibrary.wiley.com
HAL Id:hal-00948718
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Consejo Superior de Investigaciones Científicas - CSIC (SPAIN)
Other partners > Universidade de Coimbra (PORTUGAL)
Other partners > University of Hong Kong - HKU (CHINA)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > James Cook University - JCU (AUSTRALIA)
Other partners > Monash University (MALAYSIA)
Other partners > Universidad de Concepción - UDEC (CHILE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Maryland (USA)
Other partners > University of Toronto (CANADA)
Other partners > Centro para la investigaciòn en Sistemas Sostenibles de producciòn agropecuaria - CIPAV (COLOMBIA)
Other partners > Swiss Federal Institute of Aquatic Science and Technology - EAWAG (SWITZERLAND)
Other partners > Egerton university (KENYA)
Other partners > Manonmaniam Sundaranar university (INDIA)
Other partners > Universidade Federal de Minas Gerais - UFMG (BRAZIL)
Other partners > Universidad Nacional del Comahue (ARGENTINA)
Other partners > University of New England - UNE (AUSTRALIA)
Other partners > Universidad de Panamà (PANAMA)
Other partners > Universidad de Puerto Rico - UPR (PUERTO RICO)
Other partners > Universidad San Francisco de Quito - USFQ (ECUADOR)
Other partners > University of Tasmania (AUSTRALIA)
Laboratory name:
Deposited On:18 Feb 2014 15:19

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