Abstract：
: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.
journal_name
C R Bioljournal_title
Comptes rendus biologiesauthors
Tedesco PA,Ibañez C,Moya N,Bigorne R,Camacho J,Goitia E,Hugueny B,Maldonado M,Rivero M,Tomanová S,Zubieta JP,Oberdorff Tdoi
10.1016/j.crvi.2007.02.004subject
Has Abstractpub_date
2007-03-01 00:00:00pages
255-64issue
3eissn
1631-0691issn
1768-3238pii
S1631-0691(07)00103-5journal_volume
330pub_type
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