2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2018 | 12:00 PM - 12:15 PM | PREDICTING SPECIES PERSISTENCE ACROSS TEMPORAL AND SPATIAL SCALES OF DISTURBANCE: INTERANNUAL VARIABILITY IN TROPICAL MONTANE STREAM INSECT COMMUNITIES | 410 B

PREDICTING SPECIES PERSISTENCE ACROSS TEMPORAL AND SPATIAL SCALES OF DISTURBANCE: INTERANNUAL VARIABILITY IN TROPICAL MONTANE STREAM INSECT COMMUNITIES

Community responses to disturbance are determined both by spatial and temporal scales of disturbing forces and by species-level traits that control resistance and resilience to disturbance. We hypothesized that landscape-scale landslide and flood disturbance history would determine spatial community composition, while site-level physical characteristics, specifically hydrologic flashiness and streambed stability, and species-level traits, specifically drift propensity and colonization ability, would predict persistence through time. We collected stream insect community composition data in ten small headwater streams across a flood and landslide disturbance history and elevation gradient in the Napo drainage in Ecuador. Our community dataset spans five years, including years before and after major landslides and flooding occurred at our sites, a uniquely extensive Neotropical stream insect dataset across temporal and spatial scales. We also carried out drift surveys and patch-scale colonization experiments during two years at a representative subset of those sites to characterize stream insect mobility traits for Neotropical stream insects. Community composition varied more on interannual scales at sites with more frequent disturbance events and lower streambed stability, with mobility traits driving species-level responses, and, surprisingly, functional and taxonomic diversity were higher at these disturbance-prone sites.

Tropical Rivers
Trait
Temporal

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Presenters/Authors

Erin Larson (), Alaska Pacific University, ern.larson@gmail.com;