Should I Stay or Should I Go? The Influence of Habitat Quality on Movement Patterns in Northern Crayfish (Orconectes virilis)

Persistent Link:
http://hdl.handle.net/10150/195565
Title:
Should I Stay or Should I Go? The Influence of Habitat Quality on Movement Patterns in Northern Crayfish (Orconectes virilis)
Author:
Craddock, Cheryl
Issue Date:
2009
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Observations of animal distributions have revealed that population densities have tracked resource quality. Various models have been proposed to account for such “resource matching.” For example, the Ideal Free Distribution (Fretwell and Lucas 1970) model employs habitat selection rules which assume mobile animals evaluate available habitat patches and select the highest quality patch first. I examined movement patterns of northern crayfish (Orconectes virilis) in response to habitat patches of different quality to test this assumption. I found that animals were more likely to leave a low quality patch than a high quality patch even when there were no other patches available, suggesting that the quality of encountered resources plays a significant role in subsequent decisions about movement. However, many animals did not leave the first patch they encountered, even when better habitat existed elsewhere and was well within their ability to sample it. Finally, not all crayfish selected the best site they encountered. My studies demonstrate that the response to resources is complex, and IFDs and other distribution models may rely on overly simplified assumptions about habitat selection behavior.
Type:
text; Electronic Dissertation
Keywords:
habitat selection; Ideal Free Disrtibution; movement; Northern Crayfish; resource matching
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Natural Resources; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Mannan, R. W.
Committee Chair:
Mannan, R. W.

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleShould I Stay or Should I Go? The Influence of Habitat Quality on Movement Patterns in Northern Crayfish (Orconectes virilis)en_US
dc.creatorCraddock, Cherylen_US
dc.contributor.authorCraddock, Cherylen_US
dc.date.issued2009en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractObservations of animal distributions have revealed that population densities have tracked resource quality. Various models have been proposed to account for such “resource matching.” For example, the Ideal Free Distribution (Fretwell and Lucas 1970) model employs habitat selection rules which assume mobile animals evaluate available habitat patches and select the highest quality patch first. I examined movement patterns of northern crayfish (Orconectes virilis) in response to habitat patches of different quality to test this assumption. I found that animals were more likely to leave a low quality patch than a high quality patch even when there were no other patches available, suggesting that the quality of encountered resources plays a significant role in subsequent decisions about movement. However, many animals did not leave the first patch they encountered, even when better habitat existed elsewhere and was well within their ability to sample it. Finally, not all crayfish selected the best site they encountered. My studies demonstrate that the response to resources is complex, and IFDs and other distribution models may rely on overly simplified assumptions about habitat selection behavior.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjecthabitat selectionen_US
dc.subjectIdeal Free Disrtibutionen_US
dc.subjectmovementen_US
dc.subjectNorthern Crayfishen_US
dc.subjectresource matchingen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineNatural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorMannan, R. W.en_US
dc.contributor.chairMannan, R. W.en_US
dc.contributor.committeememberMatter, Williamen_US
dc.contributor.committeememberConway, Courtneyen_US
dc.identifier.proquest10519en_US
dc.identifier.oclc659752247en_US
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