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Riparian plant litter quality increases with latitude.

Abstract：

:Plant litter represents a major basal resource in streams, where its decomposition is partly regulated by litter traits. Litter-trait variation may determine the latitudinal gradient in decomposition in streams, which is mainly microbial in the tropics and detritivore-mediated at high latitudes. However, this hypothesis remains untested, as we lack information on large-scale trait variation for riparian litter. Variation cannot easily be inferred from existing leaf-trait databases, since nutrient resorption can cause traits of litter and green leaves to diverge. Here we present the first global-scale assessment of riparian litter quality by determining latitudinal variation (spanning 107°) in litter traits (nutrient concentrations; physical and chemical defences) of 151 species from 24 regions and their relationships with environmental factors and phylogeny. We hypothesized that litter quality would increase with latitude (despite variation within regions) and traits would be correlated to produce 'syndromes' resulting from phylogeny and environmental variation. We found lower litter quality and higher nitrogen:phosphorus ratios in the tropics. Traits were linked but showed no phylogenetic signal, suggesting that syndromes were environmentally determined. Poorer litter quality and greater phosphorus limitation towards the equator may restrict detritivore-mediated decomposition, contributing to the predominance of microbial decomposers in tropical streams.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Boyero L,Graça MAS,Tonin AM,Pérez J,J Swafford A,Ferreira V,Landeira-Dabarca A,A Alexandrou M,Gessner MO,McKie BG,Albariño RJ,Barmuta LA,Callisto M,Chará J,Chauvet E,Colón-Gaud C,Dudgeon D,Encalada AC,Figueroa R,Fle

doi

10.1038/s41598-017-10640-3

subject

Has Abstract

pub_date

2017-09-05 00:00:00

pages

10562

issue

1

issn

2045-2322

pii

10.1038/s41598-017-10640-3

journal_volume

7

pub_type

杂志文章

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