2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2019 | 10:00 AM - 10:15 AM | BIOMASS LOSS AND SPECIES TURNOVER DURING DROUGHT SHIFT COMMUNITY EXCRETION STOICHIOMETRY IN A PRAIRIE STREAM | 151 ABC

BIOMASS LOSS AND SPECIES TURNOVER DURING DROUGHT SHIFT COMMUNITY EXCRETION STOICHIOMETRY IN A PRAIRIE STREAM

Animal excretion contributes significantly to nutrient cycling. Extreme events such as drought may alter animals’ nutrient contributions to ecosystems through shifts in species composition and biomass. We quantified biomass and nutrient excretion of assemblages comprising fishes, crayfish, and tadpoles in 12 isolated pools during the harshest drought on record for Kings Creek, KS. We predicted assemblage biomass would decline with pool size because of deteriorating conditions and temporal differences in biomass and taxonomic composition would alter assemblage contributions to nutrient recycling. Assemblage N excretion rates declined as biomass was reduced by mortality, emigration, or metamorphosis. P excretion rates initially declined, but increased later because biomass of species with relatively high P excretion rates was maintained. Additionally, biomass of a non-native fish with low excretion N: P increased. Consequently, N: P of assemblage excretion was reduced during drought. Animal-mediated nutrient recycling was altered by the loss of biomass and the stoichiometric traits of taxa that differed in their occurrence among pools and tolerance to drought conditions.

Disturbance
Nutrients
ClimateChange

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Presenters/Authors

Garrett Hopper (), Kansas State University, ghopper@ksu.edu;