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Browsing by Subject "Perca flavescens"

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    Kairomone versus visual response to a predator in Notropis heterolepis
    (2012-04-11) Conley, Hannah
    Fish use a number of methods to avoid detection by predators and survive. This study investigated two of these methods: visual detection of the predator and kairomones, a chemical given off by the predator that alerts the prey of its presence. We proposed to test the responses of Notropis heterolepis (Blacknose Shiners) to each of these stimuli given by predator Yellow Perch, Perca flavescens. We predicted that shiners would increase activity in response to the visual stimulus, and would decrease activity in response to the kairomone stimulus. We tested this question by exposing shiners to perch kairomones in one treatment, giving shiners a visual of the perch in another treatment, and monitoring their activity for both treatments. Our results showed no significant difference in the shiners’ response to visual versus kairomone stimuli.
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    Predation Risk and Habitat Complexity: Shoaling Behavioral Changes in Pimephales Promelas
    (2011-02-01) Brass, Steven
    Grouping behavior in fish is a well‐understood phenomenon present in numerous species. Habitat and predation risk are two major influences on this behavior and our experiment was designed to quantify the how shoaling behavior in Pimephales promelas differed with an increase in complexity of environment and predation risk. We found that shoaling behavior was not different when habitat complexity increased or in the presence of a natural predator (Perca flavescens). While both of these factors are expected to affect grouping behaviors we were unable to quantitatively see a difference in the distances between individuals and the shoal diameter.