Leaf litter traits drive community structure and functioning in a natural aquatic microcosm

Autor(es)

Migliorini, Gustavo H. ; Srivastava, Diane S. ; Romero, Gustavo Q.

• Tipo de documento: Artigo Científico
• Fonte: FRESHWATER BIOLOGY; v. 63, n. 4, p. 12-pg., 2018-04-01.

Resumo

Leaf litter fuels secondary production in many aquatic ecosystems. Although the identity and species richness of leaf litter have been shown to influence ecosystem functioning and food-web composition, it has been challenging to relate such patterns to mechanisms based on litter traits. Here, we investigate how six different leaf litter species, and their mixture, affect litter decomposition, as well as the colonisation and survival of associated aquatic invertebrates in natural microecosystems (tank bromeliads). We then ask whether these effects of litter composition are explained by chemical and structural traits of the litter. Litter composition affected decomposition rates, assembly of aquatic macroinvertebrates in bromeliads and survival of some detritivores (e.g. Chironomidae). In general, most of this effect of litter composition was due to differences between litter species, not between single-species and six-species mixtures, and could be explained in terms of two dominant axes in litter traits. Decomposition was fastest in litters with high specific leaf area (SLA), N:P ratios and N and P contents, and slowest in litters with high lignin content and C:N ratios. Chironomid survival was also greatest on high N, N:P and SLA litters. Our results highlight the importance of considering leaf litter traits on the structure and functioning of freshwater ecosystems in future studies. More broadly, these results add to a growing consensus that functional traits of resource species, rather than the number of resource species, are essential to predicting resource-consumer interactions in food webs. (AU)

• Processo FAPESP: 12/51143-3 - Mudanças climáticas globais e funcionamento de ecossistemas em fitotelmatas
• Beneficiário: Gustavo Quevedo Romero
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 16/01209-9 - Efeitos das mudanças climáticas sobre estrutura de redes tróficas em gradientes latitudinais
• Beneficiário: Gustavo Quevedo Romero
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 12/20249-0 - Efeitos da diversidade funcional de detritos sobre a estrutura de redes tróficas e o funcionamento de ecossistemas de fitotelmatas
• Beneficiário: Gustavo Henrique Migliorini
• Modalidade de apoio: Bolsas no Brasil - Mestrado