2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 2:00 PM - 3:30 PM | INTRASPECIFIC TRAIT VARIABILITY CAN HELP UNDERSTAND SPECIES INTERACTIONS DURING BIOLOGICAL INVASIONS | Virtual Platform
INTRASPECIFIC TRAIT VARIABILITY CAN HELP UNDERSTAND SPECIES INTERACTIONS DURING BIOLOGICAL INVASIONS
Intraspecific variability in diet can be used as a tool for understanding the trophic interactions between invasive and native fish species. Individuals can change their trophic niche width in the presence of closely-related species but the effects of invaders on intraspecific diet variability (IDV) of native species is still understudied. Our objective was to analyze how the IDV in one native species (Phalloceros harpagos) changed according to the presence of a common invasive species (guppy - Poecilia reticulata). We hypothesized that guppies' presence will reduce the natives' trophic niche width by reducing IDV, as an effect of interspecific competition. We collected fish from streams in Brazil where species were found in allopatry and sympatry. Our results revealed high IDV in both species when in allopatry. The native species shifted its trophic niche when occurring in sympatry with guppies by reducing their IDV as expected. These results suggest that guppy invasion impacts functionally similar native fish by affecting the individuals' trophic variability.
- Ecological dynamics
- Conservation
- Tropical
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Presenters/Authors
Jeferson Amaral
(), Universidade do Estado do Rio de Janeiro, jefersonr.amaral@gmail.com;
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