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Browsing by Subject "crayfish"

Now showing 1 - 3 of 3
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    The Effect of Available Space on Crayfish Aggression
    (2010-04-13) Larson, Kelli; Greenfield, Morgan
    Scientific literature has shown that crayfish are aggressive creatures and that aggression manifests itself in various situations where resources such as space or food are limited. The experiment was designed to test the possibility that a decrease in available space for the crayfish Orconectes virilis would increase the amount of agonistic behavior between the observed crayfish. By studying crayfish from Lake Itasca, the goal was to determine if a decrease in space was a situation that caused crayfish to be more aggressive to each other. Using a fish tank and a movable wall, the amount of space given to the two crayfish is decreased by ten centimeters twice, thus giving three separate space increments of behavior to observe. The results showed a significant difference in the behavior frequency between the first and third space increments.
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    Orconectes virilis Body Size and Shelter Preference
    (2012-04-11) Hawkinson, Anna
    Environment preference in terms of light and dark was tested on Crayfish (Orconectes virilis) from Itasca Lake in north central Minnesota. Twelve crayfish were caught from the lake and noted to be either “large” or “small”. Crayfish were individually put into one of two identical enclosures for 5 min. Every 30 sec the location of the crayfish was noted. The enclosures were divided up into four quadrants varying in covered or open and black or white sides/bottoms. Data was analyzed with graphs and chi square tests. Overall, crayfish spent a significant amount of time in the darkest covered quadrant. A significant difference was also found between the frequency of time spent in each quadrant between small and large crayfish; small crayfish remained in the darkest covered quadrant more than large crayfish.
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    Sinks & Rises of the South Branch Root River Fillmore Co., Mn
    (2009-04-02) Alexander Jr., E. Calvin; Alexander, Scott C; Luhmann, Andrew J; Anger, Cale T; Green, Jeffrey A; Peters, Andrew J