2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 9:45 AM - 10:00 AM | RECIPROCAL TRANSPLANTS DISPLAY CONTRASTING RESPONSES OF MAYFLY GROWTH AND BODY PHOSPHORUS IN TEMPERATE AND TROPICAL STREAMS | 306B

RECIPROCAL TRANSPLANTS DISPLAY CONTRASTING RESPONSES OF MAYFLY GROWTH AND BODY PHOSPHORUS IN TEMPERATE AND TROPICAL STREAMS

Increases in temperature associated with climate change may impact aquatic biota differentially depending on the temperature variability they currently experience. We conducted reciprocal transplants using mayflies in the family Baetidae across a ~1200m elevational gradient in the Colorado Rockies (CO) and Ecuadorian Andes (EC). We hypothesized that insects from temperate streams, which experience greater seasonal and diel temperature fluctuations, would be less vulnerable to elevated stream temperatures than phylogenetically-related organisms from tropical regions, where temperatures are annually stable. Responses followed expectations: when high elevation CO mayflies were moved to lower, warmer streams, their growth rate and body % Phosphorus (P) increased. In contrast EC mayflies experienced lower growth rates and body %P when moved from higher elevation streams to lower elevation streams. Furthermore, both CO and EC populations had lower growth rates when moved from lower warm streams to higher cool streams with little to no change in body %P. Populations in EC may be locally adapted and closer to their thermal limits and therefore more sensitive to temperature change than CO where populations show plasticity in their thermal tolerance.

S09 The importance of environmental gradients for the advance of tropical stream ecology
C20 Climate Change
S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems

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Presenters/Authors

Amanda Rugenski (), University of Georgia, atrugenski@gmail.com;