2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021 | 8:30 AM - 10:30 AM | HYDROLOGIC CONNECTIVITY AND PATCH SIZE SHAPE PATTERNS OF ABUNDANCE IN RIVER ROCK POOLS | Virtual Platform

HYDROLOGIC CONNECTIVITY AND PATCH SIZE SHAPE PATTERNS OF ABUNDANCE IN RIVER ROCK POOLS

In highly dynamic riverine landscapes, hydrologic connectivity and patch size are important components of landscape structure that underpin key processes that determine species abundance and richness across scales. However, responses to connectivity and patch size are dependent on species traits such as their modes of dispersal and life histories. We quantified the hydrologic connectivity of hundreds of riverine rock pools using a novel approach that combines remote sensing, historical river gauge data, and logistic regression. We modeled densities of two focal taxa, the Virginia river snail and skimmer dragonfly nymphs, in response to hydrologic connectivity (pool flood height, distance to channel, days since last flood), patch size (surface area, depth), and season using generalized linear mixed models. There were key differences in how each taxon responded to hydrologic connectivity with increasing pool flood height and distance to the main channel having a negative effect on snail densities, while dragonfly nymph densities increased with pool isolation. Snail densities increased with pool surface area but had no significant effect on dragonfly densities. Snails showed no difference in their temporal distribution across seasons, while dragonfly nymph densities were higher in summer and fall.

Landscape
Models
Habitat

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Presenters/Authors

Charles Stunkle (), Virginia Commonwealth University, crstunkle@mymail.vcu.edu;