Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/325901
Type: Artigo
Title: Terrestrial Support Of Aquatic Food Webs Depends On Light Inputs: A Geographically-replicated Test Using Tank Bromeliads
Terrestrial support of aquatic food webs depends on light inputs: a geographically-replicated test using tank bromeliads
Author: Farjalla, Vinicius F.
González, Angélica L.
Céréghino, Régis
Dézerald, Olivier
Marino, Nicholas A. C.
Piccoli, Gustavo C. O.
Richardson, Barbara A.
Richardson, Michael J.
Romero, Gustavo Q.
Srivastava, Diane S.
Abstract: Food webs of freshwater ecosystems can be subsidized by allochthonous resources. However, it is still unknown which environmental factors regulate the relative consumption of allochthonous resources in relation to autochthonous resources. Here, we evaluated the importance of allochthonous resources (litterfall) for the aquatic food webs in Neotropical tank bromeliads, a naturally replicated aquatic microcosm. Aquatic invertebrates were sampled in more than 100 bromeliads within either open or shaded habitats and within five geographically distinct sites located in four different countries. Using stable isotope analyses, we determined that allochthonous sources comprised 74% (+/- 17%) of the food resources of aquatic invertebrates. However, the allochthonous contribution to aquatic invertebrates strongly decreased from shaded to open habitats, as light incidence increased in the tanks. The density of detritus in the tanks had no impact on the importance of allochthonous sources to aquatic invertebrates. This overall pattern held for all invertebrates, irrespective of the taxonomic or functional group to which they belonged. We concluded that, over a broad geographic range, aquatic food webs of tank bromeliads are mostly allochthonous-based, but the relative importance of allochthonous subsidies decreases when light incidence favors autochthonous primary production. These results suggest that, for other freshwater systems, some of the between-study variation in the importance of allochthonous subsidies may similarly be driven by the relative availability of autochthonous resources.
Food webs of freshwater ecosystems can be subsidized by allochthonous resources. However, it is still unknown which environmental factors regulate the relative consumption of allochthonous resources in relation to autochthonous resources. Here, we evaluat
Subject: Allochthonous Carbon
Allochthony
Aquatic Food Webs
Autochthonous Carbon
Autochthony
Natural Microcosms
Stable Isotopic Analysis
Tank Bromeliads
Tropics
Carbono - Isótopos
Serapilheira
Cadeias alimentares (Ecologia)
Microcosmos
Isótopos estáveis
Bromeliacea
Country: Estados Unidos
Editor: John Wiley & Sons
Citation: Ecology. Wiley-blackwell, v. 97, p. 2147 - 2156, 2016.
Rights: aberto
Fechado
Identifier DOI: 10.1002/ecy.1432
Address: https://esajournals.onlinelibrary.wiley.com/doi/full/10.1002/ecy.1432
Date Issue: 2016
Appears in Collections:IB - Artigos e Outros Documentos

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