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Global distribution of a key trophic guild contrasts with common latitudinal diversity patterns

Boyero, Luz and Pearson, Richard G. and Dudgeon, David and Graça, Manuel A. S. and Gessner, Mark O. and Albariño, Ricardo J. and Ferreira, Verónica and Yule, Catherine M. and Boulton, Andrew J. and Arunachalam, Muthukumarasamy and Callisto, Marcos and Chauvet, Eric and Ramírez, Alonso and Chará, Julián and Moretti, Marcelo S. and Gonçalves, José F. Jr and Helson, Julie E. and Chará-Serna, Ana Marcela and Encalada, Andrea C. and Davies, Judy N. and Lamothe, Sylvain and Cornejo, Aydeé and Li, Aggie O. Y. and Buria, Leonardo M. and Villanueva, Verónica Díaz and Zúñiga, Maria del Carmen and Pringle, Catherine M. Global distribution of a key trophic guild contrasts with common latitudinal diversity patterns. (2011) Ecology, 92 (9). 1839-1848. ISSN 0012-9658

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Official URL: http://dx.doi.org/10.1890/10-2244.1

Abstract

Most hypotheses explaining the general gradient of higher diversity toward the equator are implicit or explicit about greater species packing in the tropics. However, global patterns of diversity within guilds, including trophic guilds (i.e., groups of organisms that use similar food resources), are poorly known. We explored global diversity patterns of a key trophic guild in stream ecosystems, the detritivore shredders. This was motivated by the fundamental ecological role of shredders as decomposers of leaf litter and by some records pointing to low shredder diversity and abundance in the tropics, which contrasts with diversity patterns of most major taxa for which broad-scale latitudinal patterns haven been examined. Given this evidence, we hypothesized that shredders are more abundant and diverse in temperate than in tropical streams, and that this pattern is related to the higher temperatures and lower availability of high-quality leaf litter in the tropics. Our comprehensive global survey (129 stream sites from 14 regions on six continents) corroborated the expected latitudinal pattern and showed that shredder distribution (abundance, diversity and assemblage composition) was explained by a combination of factors, including water temperature (some taxa were restricted to cool waters) and biogeography (some taxa were more diverse in particular biogeographic realms). In contrast to our hypothesis, shredder diversity was unrelated to leaf toughness, but it was inversely related to litter diversity. Our findings markedly contrast with global trends of diversity for most taxa, and with the general rule of higher consumer diversity at higher levels of resource diversity. Moreover, they highlight the emerging role of temperature in understanding global patterns of diversity, which is of great relevance in the face of projected global warming.

Item Type:Article
Additional Information:Thanks to Ecological Society of America editor. The original PDF of the article can be found at Ecology website : http://www.esajournals.org/doi/abs/10.1890/10-2244.1
HAL Id:hal-00979570
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Centro de investigaciones y estudios en biodiversidad y recursos geneticos - CIEBREG (COLOMBIA)
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)
Other partners > Instituto Conmemorativo Gorgas de Estudios de la Salud - ICGES (PANAMA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > James Cook University - JCU (AUSTRALIA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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 > Manonmaniam Sundaranar university (INDIA)
Other partners > Monash University (AUSTRALIA)
Other partners > Eidgenössische Technische Hochschule Zürich - ETHZ (SWITZERLAND)
Other partners > Universidad del Valle (COLOMBIA)
Other partners > Universidade Federal de Minas Gerais - UFMG (BRAZIL)
Other partners > University of Georgia - UGA (USA)
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)
Laboratory name:
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Deposited By: Eric Chauvet
Deposited On:25 Mar 2014 11:28

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