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Controle ambiental sobre a estrutura e multifuncionamento de ecossistemas bromelícolas

Authors: Neutzling, Alexandre Schneid;

Controle ambiental sobre a estrutura e multifuncionamento de ecossistemas bromelícolas

Abstract

Este estudo explora os efeitos multiestressores do ambiente sobre as propriedades estruturais da biodiversidade e estabilidade do funcionamento de ecossistemas bromelícolas. Através de um experimento de colonização em habitat conservado, simulamos diferentes cenários pluviométricos em duas áreas, extremos de um gradiente de cobertura de dossel de restinga. Nosso objetivo foi verificar se diferentes condições ambientais resultam em diferentes importâncias relativas dos parâmetros de redes tróficas sobre o funcionamento global de ecossistemas. Nossos resultados evidenciam que os parâmetros de redes tróficas têm diferentes importâncias para o multifuncionamento do processamento da matéria orgânica quando os ecossistemas estão sujeitos a diferentes condições ambientais. A conectância aliada à variação de temperatura determinam o multifuncionamento em áreas de menor estresse ambiental. Em áreas de maior variação ambiental, a riqueza de espécies é o único fator que determina o multifuncionamento. Além disso, quando consideramos cenários de mudanças climáticas, como chuvas acentuadas, os ecossistemas em áreas de menor variação ambiental aparentam perder os efeitos positivos da conectância. Nossos resultados evidenciam a necessidade de considerar parâmetros gerais de redes ecológicas e a variação ambiental nos futuros estudos de biodiversidade e funcionamento ecossistêmico (B-EF). Este estudo avança na compreensão da teoria B-EF e fornece informações importantes sobre os efeitos das mudanças climáticas sobre a organização e funcionamento da biodiversidade.

This study explores the multi-stressor effects of the environment on the structural properties and functioning stability of bromeliad ecosystems. Through a controlled colonization experiment in a natural habitat, we simulated different rainfall scenarios across a restinga canopy cover gradient. Our goal was to verify whether distinct environmental conditions could result in different relative importances of food web parameters when determining multiple ecosystem functions. Our results indicate that food web parameters have distinct importances in the organic matter processing chain when ecosystems are subjected to varying environmental conditions. Connectance and temperature variation determine ecosystem multifunctioning in less stressful habitats, such as closed restingas and forests. In habitats with more variation in environmental conditions (open restinga), only species richness was correlated with the multifunctionality of bromeliad ecosystems. Additionally, when we consider scenarios of climate change, ecosystems in less variable conditions (closed restinga) seem to lose the positive effects of connectance on ecosystem multifunctionality. Our results underscore the need to consider general food web parameters and environmental variation in future studies of biodiversity and ecosystem functioning (B-EF). This study advances the understanding of B-EF theory and provides important information about the effects of climate change on the organization and functioning of ecosystems.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Pós-graduação em Biologia Animal - IBILCE

Capes: 001

Keywords

Environmental variation, Biodiversidade, Food webs, Biodiversity, Estabilidade, Variação ambiental, Conectância, Connectance, Redes tróficas, Mudanças climáticas, Climate change, Stability

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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