Tedesco P. A. auteur aut IRD Ibanez Carla auteur aut IRD Moya N. auteur aut IRD Bigorne Rémy auteur aut IRD Camacho Jimena auteur aut IRD Goitia E. auteur aut IRD Hugueny Bernard auteur aut IRD Maldonado M. auteur aut IRD Rivero M. auteur aut IRD Tomanova S. auteur aut IRD Zubieta José P. auteur aut IRD Oberdorff Thierry auteur aut IRD text journalArticle eng text/pdf born digital access Productivity (trophic energy) is one of the most important factors promoting variation in species richness. A variety of species-energy relationships have been reported, including monotonically positive, monotonically negative, or unimodal (i.e. hump-shaped). The exact form of the relationship seems to depend, among other things, on the spatial scale involved. However, the mechanisms behind these patterns are still largely unresolved, although many hypotheses have been suggested. Here we report a case of local-scale positive species-energy relationship. Using 14 local fish assemblages in tropical forested headwater streams (Bolivia), and after controlling for major local abiotic factors usually acting on assemblage richness and structure, we show that rising energy availability through leaf litter decomposition rates allows trophically specialized species to maintain viable populations and thereby to increase assemblage species richness. By deriving predictions from three popular mechanistic explanations, i.e. the 'increased population size', the 'consumer pressure', and the 'specialization' hypotheses, our data provide only equivocal support for the latter. specialized energy availability species richness species energy theory specialization hypothesis tropical riverine fish Bolivia 036 330 3 255-264 2007 1631-0691 https://www.documentation.ird.fr/hor/fdi:010040609 10.1016/j.crvi.2007.02.004 1631-0691 [F B010040609] https://www.documentation.ird.fr/hor/fdi:010040609 https://www.documentation.ird.fr/intranet/publi/2007/08/010040609.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-09-04 2017-08-23 fdi:010040609 fre