The effect of Orconectes rusticus on the mortality and habitat selection of Orconectes propinquus.

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dc.contributor.author Esman, Laura A. en_US
dc.coverage.spatial Burt Lake en_US
dc.coverage.spatial Maple River - East Branch en_US
dc.coverage.spatial Lake Kathleen en_US
dc.date.accessioned 2007-06-14T21:44:34Z
dc.date.available 2007-06-14T21:44:34Z
dc.date.issued 1991 en_US
dc.identifier.uri http://hdl.handle.net/2027.42/54266
dc.description.abstract The effect of Orconectes rusticus on the mortality and habitat selection of Orconectes propinquus was examined at the University of Michigan Biological Station. Substrate preference was determined by placing O. propinquus, and O. propinquus and O. rusticus in aquaria with different sequences of substrates: sand, gravel, pebble, rock. The substrate occupied by the crayfish was recorded. Chi-aquared analysis indicated that in in the presence of O. rusticus, there was a significant shift in habitat occupation by O. propinquus (0.025>p>0.01). The effect of O. rusticus on O. propinquus mortality was determined by constructing enclosures containing O. propinquus, and O. rusticus and O. propinquus (sex and size matched to 1 mm, and sex matched with a carapace length difference of >5 mm). The enclosures were placed in Douglas Lake for 10 days. At the time of removal, the crayfish were measured to examine the growth of O. propinquus with and without the presence of O. rusticus. The results indicated that the direct mortality of O. propinquus caused by O. rusticus occurred only when O. rusticus had a carapace length of 5 mm greater than O. propinquus. The effect of O. rusticus on the growth of O. propinquus was not significant (t-test, p=0.247), although there was a trend towards showing an effect. en_US
dc.format.extent 401216 bytes
dc.format.extent 3144 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.subject Undergraduate Research Exper. en_US
dc.subject.other ORCONECTES en_US
dc.subject.other INTRODUCTION en_US
dc.subject.other HABITAT en_US
dc.subject.other SELECTION en_US
dc.subject.other CRAYFISHES en_US
dc.subject.other ARTHROPODS en_US
dc.subject.other INVERTEBRATES en_US
dc.subject.other MORTALITY en_US
dc.subject.other COMPETITION en_US
dc.subject.other SPECIES en_US
dc.title The effect of Orconectes rusticus on the mortality and habitat selection of Orconectes propinquus. en_US
dc.subject.hlbsecondlevel Natural Resource and Environment en_US
dc.subject.hlbtoplevel Science en_US
dc.contributor.affiliationum Biological Station, University of Michigan en_US
dc.contributor.affiliationumcampus Ann Arbor en_US
dc.description.bitstreamurl http://deepblue.lib.umich.edu/bitstream/2027.42/54266/1/2702.pdf en_US
dc.description.filedescription Description of 2702.pdf : Access restricted to on-site users at the U-M Biological Station. en_US
dc.owningcollname Biological Station, University of Michigan (UMBS)
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