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Latitudinal gradient of nestedness and its potential drivers in stream detritivores

Boyero, Luz and Pearson, Richard G. and Swan, Christopher M. and Hui, Cang and Albariño, Ricardo J. and Arunachalam, Muthukumarasamy and Callisto, Marcos and Chará, Julián and Chará-Serna, Ana Marcela and Chauvet, Eric and Cornejo, Aydeé and Dudgeon, David and Encalada, Andrea C. and Ferreira, Verónica and Gessner, Mark O. and Gonçalves, José F. Jr and Graça, Manuel A. S. and Helson, Julie E. and Mathooko, Jude M. and McKie, Brendan G. and Moretti, Marcelo S. and Yule, Catherine M. Latitudinal gradient of nestedness and its potential drivers in stream detritivores. (2015) Ecography, vol. 38 (n° 8). pp. 949-955. ISSN 0906-7590

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Official URL: http://dx.doi.org/10.1111/ecog.00982

Abstract

Understanding what mechanisms shape the diversity and composition of biological assemblages across broad-scale gradients is central to ecology. Litter-consuming detritivorous invertebrates in streams show an unusual diversity gradient, with a-diversity increasing towards high latitudes but no trend in a-diversity. We hypothesized this pattern to be related to shifts in nestedness and several ecological processes shaping their assemblages (dispersal, environmental filtering and competition). We tested this hypothesis, using a global dataset, by examining latitudinal trends in nestedness and several indicators of the above processes along the latitudinal gradient. Our results suggest that strong environmental filtering 95 and low dispersal in the tropics lead to often species-poor local detritivore assemblages, nested in richer regional assemblages. At higher latitudes, dispersal becomes stronger, disrupting the nested assemblage structure and resulting in local assemblages that are generally more species-rich and non-nested subsets of the regional species pools. Our results provide evidence that mechanisms underlying assemblage composition and diversity of stream litter-consuming detritivores shift across latitudes, and provide an explanation for their unusual pattern of increasing a-diversity with latitude. When we repeated these analyses for whole invertebrate assemblages of leaf litter and for abundant taxa showing reverse or no diversity gradients we found no latitudinal patterns, suggesting that function-based rather than taxon-based analyses of assemblages may help elucidate the mechanisms behind diversity gradients.

Item Type:Article
Additional Information:Thanks to Wiley editor. The definitive version is available at http://onlinelibrary.wiley.com The original PDF of the article can be found at Wiley website : http://onlinelibrary.wiley.com/doi/10.1111/ecog.00982/abstract
HAL Id:hal-01187241
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Centro de investigaciones y estudios en biodiversidad y recursos geneticos - CIEBREG (COLOMBIA)
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)
Other partners > Leibniz-Institut für Gewässerökologie und Binnenfischerei - IGB (GERMANY)
Other partners > IKERBASQUE (SPAIN)
Other partners > James Cook University - JCU (AUSTRALIA)
Other partners > Monash University (MALAYSIA)
Other partners > Technische Universität Berlin - TU Berlin (GERMANY)
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 > Egerton university (KENYA)
Other partners > Manonmaniam Sundaranar university (INDIA)
Other partners > Stellenbosch University - SU (SOUTH AFRICA)
Other partners > Sveriges lantbruksuniversitet - SLU (SWEDEN)
Other partners > Universidade de Brasília - UnB (BRAZIL)
Other partners > University of British Columbia (CANADA)
Other partners > Universidade Federal de Minas Gerais - UFMG (BRAZIL)
Other partners > Universidad Nacional del Comahue (ARGENTINA)
Other partners > Euskal Herriko Unibertsitatea - EHU (SPAIN)
Other partners > Universidad San Francisco de Quito - USFQ (ECUADOR)
Other partners > Universidade Vila Velha - UVV (BRAZIL)
Laboratory name:
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Deposited By: Eric Chauvet
Deposited On:26 Aug 2015 11:19

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