2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 9:00 AM - 9:15 AM | REACH-SCALE FACTORS AND RIVER NETWORK ATTRIBUTES AFFECT THE LONGITUDINAL DISTRIBUTION OF MACROINVERTEBRATES | 151 G

REACH-SCALE FACTORS AND RIVER NETWORK ATTRIBUTES AFFECT THE LONGITUDINAL DISTRIBUTION OF MACROINVERTEBRATES

The River Continuum Concept (RCC) is worldwide considered as a milestone in Stream Ecology because it links the physical attributes of a stream with the availability of food resources (i.e., organic matter and algal biomass), and ultimately with patterns in biodiversity. Up- to downstream gradients in abiotic factors select aquatic taxa, determining progressive shifts in the composition of macroinvertebrate communities along the river continuum. However, the growing attention on the river network perspective has led a several authors to reject the linear and predictable longitudinal changes of the RCC and support, instead, an idea of streams as discontinuum- or patchy-structured systems. In this study quantitative samples of macroinvertebrates were collected in eight sites, located on the main stem of the Pellice stream (Northwestern Italy). The variation in the composition and diversity of macroinvertebrate communities was analyzed in relation to different variables, including in-site factors (e.g., substrate composition), the position along the longitudinal gradient and river network attributes (e.g., distance from tributary junctions). Our results show that benthic invertebrate communities are significantly affected by a combination of factors, acting at both reach and river network scale.

Biodiversity
Network
Spatial

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Presenters/Authors

Alberto Doretto (), University of Piemonte Orientale (Alessandria, Italy), alberto.doretto@uniupo.it;