2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | CHARACTERIZNG COMMUNITY-LEVEL SIZE SPECTRA IN MID-ATLANTIC, PIEDMONT SREAMS OF VIRGINIA (USA) | Virtual Platform
CHARACTERIZNG COMMUNITY-LEVEL SIZE SPECTRA IN MID-ATLANTIC, PIEDMONT SREAMS OF VIRGINIA (USA)
Many aquatic communities demonstrate an inverse scaling relationship between average body mass and density. Using quantitative samples of benthic macroinvertebrates and fishes, we modeled this relationship in three Mid-Atlantic, Piedmont streams where little empirical research has been conducted. The size-spectra method, in which individuals are identified by size, not taxonomy, and are aggregated within log2 dry mass bins was used to model density as a power-law function of individual mass. Our size-spectra models provide new insight to aquatic community structure in the study region and are particularly notable because they combine macroinvertebrate and fish data in community-level models. Time-staggered samples were also used to test the hypothesis that size-specific fish density is an instantaneous function of invertebrate density. Fish data were collected in September, but macroinvertebrates were collected in July, August, and September. By comparing macroinvertebrate samples from different months with the September fish data, we assess whether fish density is more closely associated with contemporaneous or prior invertebrate density.
- Species interactions
- Energy flows
- Models
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Presenters/Authors
Giancarlo Racanelli
(), Virginia Commonwealth University, racanellig@mymail.vcu.edu;
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Daniel McGarvey
(), Center for Environmental Studies, Virginia Commonwealth University, djmcgarvey@vcu.edu;
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