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Differential growth rates, shelter competition, food competition, and aggression displays between O. rusticus and O. virilis.

dc.contributor.authorKuntz, Roberten_US
dc.contributor.authorVanDenBerghe, Carolynen_US
dc.contributor.authorWitter, Leslieen_US
dc.coverage.spatialUMBS Campusen_US
dc.coverage.spatialCarp River - Emmet Co.en_US
dc.coverage.spatialLake Kathleenen_US
dc.coverage.spatialMaple Riveren_US
dc.coverage.spatialBurt Lakeen_US
dc.date.accessioned2007-06-14T23:04:07Z
dc.date.available2007-06-14T23:04:07Z
dc.date.issued1999en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/54843
dc.description.abstractO. rusticus and O. virilis are two species of crayfish that live in the Great Lakes region. O. rusticus is a recent invader in this region, and its appearance has been correlated with a decline in numbers of native O. virilis. The objective of this experiment was to compare growth rates, shelter competition, feeding competition, and aggressive behavior between the two species. Prior research has indicated that O. rusticus grows faster and is aggressive towards O. virilis. The results of the experiment found no significant difference between growth rates, shelter competition, feeding competition, and aggressive behavior for O. rusticus and O. virilis. The findings were probably inaccurate due to procedural and equipment problems. Another anti-predatory tactic used by prey species is schooling. Schooling provides defense and protection for individuals within the school. By definition, a polarized school is comprised of similar size individuals who synchronize their speed and movement. Two working hypotheses were created from these observations. First, that N. stramineus will exhibit reactions to both visual and olfactory cues given from a predator, and vision will be the most significant cue of the two. Tests introduced N. stramineus to visual and olfactory cues independently of each other to determine the importance of each. Second, that schooling patterns show variation with size of N. stramineus individuals in the school so that oddly sized individuals will be situated in the center of the school. Individuals of varying size were added to schools of uniform size to determine distributions among them. A significant difference was found between visual and two different olfactory cues. N. stramineus reacted strongest to the visual cues. The two different olfactory cues were not significantly different. It was also found that large N. stramineus individuals tend to situate the center of the school, whereas small individuals were most often found on the outside of the school.en_US
dc.format.extent335378 bytes
dc.format.extent3144 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.relation.haspartTable of Numbersen_US
dc.subjectGeneral Ecologyen_US
dc.subject.otherINVERTEBRATESen_US
dc.subject.otherCRUSTACEANSen_US
dc.subject.otherCRAYFISHESen_US
dc.subject.otherBEHAVIORen_US
dc.subject.otherORCONECTESen_US
dc.subject.otherRANGEen_US
dc.subject.otherGROWTHen_US
dc.subject.otherRATESen_US
dc.subject.otherFEEDINGen_US
dc.subject.otherFORAGINGen_US
dc.titleDifferential growth rates, shelter competition, food competition, and aggression displays between O. rusticus and O. virilis.en_US
dc.typeWorking Paperen_US
dc.subject.hlbsecondlevelNatural Resource and Environmenten_US
dc.subject.hlbtoplevelScienceen_US
dc.contributor.affiliationumBiological Station, University of Michiganen_US
dc.contributor.affiliationumcampusAnn Arboren_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/54843/1/3284.pdfen_US
dc.description.filedescriptionDescription of 3284.pdf : Access restricted to on-site users at the U-M Biological Station.en_US
dc.owningcollnameBiological Station, University of Michigan (UMBS)


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