2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2021 | 2:00 PM - 3:30 PM | DOES CANOPY COVER AFFECT THE ECOSYSTEM SIGNIFICANCE OF FISH-NUTRIENT MINERALIZATION IN BRAZIL STREAMS? | Virtual Platform

DOES CANOPY COVER AFFECT THE ECOSYSTEM SIGNIFICANCE OF FISH-NUTRIENT MINERALIZATION IN BRAZIL STREAMS?

Increasing nutrient concentrations, altering ecosystem characteristics and fish communities are some of the impacts caused by deforestation that affect ecosystem functioning. Fish contribution in nutrient dynamics, by recycling nutrients through excretion, can be altered by human impact. In this study we investigated how land-use affected the role of a fish species (Characidium vidali) as a nutrient provider in six streams along a deforestation gradient in the Atlantic rainforest in Brazil. We measured fish density, SRP and NH4+-N excretion and uptake rates to estimate the contribution of fish excretion relative to the ecosystem nutrient demand. Deforestation was not associated with increases in background nutrient concentrations, reductions in uptake rates, or in fish density. Deforestation also did not affect the role of fish as nutrient recyclers. Fish density was the only factor that affected the importance of excretion for the ecosystem demand. This is the first study in the Neotropics that investigates the potential effects of changing land-use on consumer-driven nutrient recycling. More studies on stream degradation are needed to comprehend human impact on fish as regulators of ecosystem processes in order to design conservation strategies.

Land use
Tropical
Ecosystem functioning

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Presenters/Authors

Beatriz Moreira Ferreira (), Universidade do Estado do Rio de Janeiro, biaferreira.biologia@gmail.com;