EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/26/2021 | 8:30 AM - 10:30 AM | FOREST LOSS INCREASES COMPOSITIONAL UNIQUENESS OF STREAM COMMUNITIES, BUT SPECIES CONTRIBUTE TO BETA DIVERSITY AT BOTH EXTREMES OF THE LAND-USE GRADIENT | Virtual Platform

FOREST LOSS INCREASES COMPOSITIONAL UNIQUENESS OF STREAM COMMUNITIES, BUT SPECIES CONTRIBUTE TO BETA DIVERSITY AT BOTH EXTREMES OF THE LAND-USE GRADIENT

We investigated the local contributions (LCBD) and the species contributions (SCBD) to beta diversity of stream benthic diatoms and insects over a gradient of land-use intensification, ranging from streams in pristine forest to agriculture catchments. We expected that LCBD would be negatively related to the percentage of forest cover in the catchment and positively related to uniqueness in stream environmental characteristics. We also expected that species with high SCBD would occur at the most degraded sites. We sampled 100 streams in southeast Brazil. Diatom and insect LCBD were negatively related to forest cover. Insects also showed a positive relationship with environmental uniqueness. We also found that SCBD of diatoms correlated positively with forest cover, but the inverse was found for insects. As forest cover was negatively correlated to uniqueness in land use, it is clear that biologically unique streams were those that deviated from the regional typical land cover. Moreover, our results indicate that the most important species to beta diversity may occur at both ends of the gradient in land-use intensity and, more importantly, diatoms and insects with the highest contribution may occur at opposite ends of the gradient.

Land use
Stream
Tropical streams and lakes

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Presenters/Authors

Fabiana Schneck (), Universidade Federal do Rio Grande - FURG, Brazil, fabiana.schneck@gmail.com;