Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of Ambystoma barbouri (streamside salamander) and Eurycea cirrigera (southern two-lined salamander) in a relatively undisturbed stream network in central Kentucky. I used likelihood ratio G-tests to identify associations between species and mesohabitat types (i.e., runs, riffles, and pools). I used second order Akaike's Information Criterion (AICc) model selection to predict patterns of presence and abundance throughout headwater reaches. Fine-scale abiotic habitat conditions influenced habitat associations and distribution patterns at larger spatial scales. Individual A. barbouri displayed strong negative associations to riffle habitat at both micro- and stream-reach scales shortly after hatching, likely as a result of passive in-stream dispersal in response to increased water velocity and turbulence. Ambystoma barbouri, in later stages of development, displayed evidence of active dispersal, resulting in stronger positive associations to run habitat and stronger negative associations to riffles. Habitat associations in late spring suggested interspecific interactions between A. barbouri and E. cirrigera, and further research is needed on the potential reversal of predatory roles between the two species as A. barbouri larvae develop. My results demonstrated the effectiveness of a multi-scale approach to investigating complex ecological processes of aquatic organisms and the utility of AICc in selecting biologically relevant predictive models of salamander presence and abundance in aquatic habitats.
","abstract_html":"<p>Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of <em>Ambystoma barbouri<em> (streamside salamander) and <em>Eurycea cirrigera<em> (southern two-lined salamander) in a relatively undisturbed stream network in central Kentucky. I used likelihood ratio G-tests to identify associations between species and mesohabitat types (i.e., runs, riffles, and pools). I used second order Akaike's Information Criterion (AIC<em>c<em>) model selection to predict patterns of presence and abundance throughout headwater reaches. Fine-scale abiotic habitat conditions influenced habitat associations and distribution patterns at larger spatial scales. Individual <em>A. barbouri<em> displayed strong negative associations to riffle habitat at both micro- and stream-reach scales shortly after hatching, likely as a result of passive in-stream dispersal in response to increased water velocity and turbulence. <em>Ambystoma barbouri<em>, in later stages of development, displayed evidence of active dispersal, resulting in stronger positive associations to run habitat and stronger negative associations to riffles. Habitat associations in late spring suggested interspecific interactions between <em>A. barbouri<em> and <em>E. cirrigera<em>, and further research is needed on the potential reversal of predatory roles between the two species as <em>A. barbouri<em> larvae develop. My results demonstrated the effectiveness of a multi-scale approach to investigating complex ecological processes of aquatic organisms and the utility of AIC<em>c<em> in selecting biologically relevant predictive models of salamander presence and abundance in aquatic habitats. </p>","abstract_has_math":false,"creators":["Yeiser, John Mark"],"institution":"Eastern Kentucky University","degree_name":"Master of Science (MS)","degree_level":"Master's","degree_discipline":"Biological Sciences","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-01-01T08:00:00Z","date_published":"2013-01-01T08:00:00Z","updated_at":"2026-07-24T02:15:19Z","subjects":["Ambystoma","Eurycea","salamanders","habitat associations","headwater streams","larvae","Ecology and Evolutionary Biology","Zoology"],"languages":[],"rights":["Copyright 2013 John Mark Yeiser"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://encompass.eku.edu/etd/149","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Yeiser, John Mark"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Encompass Digital Archive, Eastern Kentucky University"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biological Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Master's"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Eastern Kentucky University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Ambystoma","Eurycea","salamanders","habitat associations","headwater streams","larvae","Ecology and Evolutionary Biology","Zoology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2013 John Mark Yeiser"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://encompass.eku.edu/etd/149"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of Ambystoma barbouri (streamside salamander) and Eurycea cirrigera (southern two-lined salamander) in a relatively undisturbed stream network in central Kentucky. I used likelihood ratio G-tests to identify associations between species and mesohabitat types (i.e., runs, riffles, and pools). I used second order Akaike's Information Criterion (AICc) model selection to predict patterns of presence and abundance throughout headwater reaches. Fine-scale abiotic habitat conditions influenced habitat associations and distribution patterns at larger spatial scales. Individual A. barbouri displayed strong negative associations to riffle habitat at both micro- and stream-reach scales shortly after hatching, likely as a result of passive in-stream dispersal in response to increased water velocity and turbulence. Ambystoma barbouri, in later stages of development, displayed evidence of active dispersal, resulting in stronger positive associations to run habitat and stronger negative associations to riffles. Habitat associations in late spring suggested interspecific interactions between A. barbouri and E. cirrigera, and further research is needed on the potential reversal of predatory roles between the two species as A. barbouri larvae develop. My results demonstrated the effectiveness of a multi-scale approach to investigating complex ecological processes of aquatic organisms and the utility of AICc in selecting biologically relevant predictive models of salamander presence and abundance in aquatic habitats.
"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:source","label":"Dc Source","values":["Encompass Digital Archive: Online Theses and Dissertations"]},{"key":"dc:title","label":"Title","values":["Habitat Associations Of Stream-Dwelling Salamanders At Multiple Spatial Scales In Central Kentucky Headwaters."]}]}],"canonical_facts":{"dc:creator":["Yeiser, John Mark"],"dc:description.abstract":["Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of Ambystoma barbouri (streamside salamander) and Eurycea cirrigera (southern two-lined salamander) in a relatively undisturbed stream network in central Kentucky. I used likelihood ratio G-tests to identify associations between species and mesohabitat types (i.e., runs, riffles, and pools). I used second order Akaike's Information Criterion (AICc) model selection to predict patterns of presence and abundance throughout headwater reaches. Fine-scale abiotic habitat conditions influenced habitat associations and distribution patterns at larger spatial scales. Individual A. barbouri displayed strong negative associations to riffle habitat at both micro- and stream-reach scales shortly after hatching, likely as a result of passive in-stream dispersal in response to increased water velocity and turbulence. Ambystoma barbouri, in later stages of development, displayed evidence of active dispersal, resulting in stronger positive associations to run habitat and stronger negative associations to riffles. Habitat associations in late spring suggested interspecific interactions between A. barbouri and E. cirrigera, and further research is needed on the potential reversal of predatory roles between the two species as A. barbouri larvae develop. My results demonstrated the effectiveness of a multi-scale approach to investigating complex ecological processes of aquatic organisms and the utility of AICc in selecting biologically relevant predictive models of salamander presence and abundance in aquatic habitats.
"],"dc:format":["application/pdf"],"dc:identifier":["https://encompass.eku.edu/etd/149"],"dc:publisher":["Encompass Digital Archive, Eastern Kentucky University"],"dc:rights":["Copyright 2013 John Mark Yeiser"],"dc:source":["Encompass Digital Archive: Online Theses and Dissertations"],"dc:subject":["Ambystoma","Eurycea","salamanders","habitat associations","headwater streams","larvae","Ecology and Evolutionary Biology","Zoology"],"dc:title":["Habitat Associations Of Stream-Dwelling Salamanders At Multiple Spatial Scales In Central Kentucky Headwaters."],"dc:type":["Master Thesis"],"thesis:degree_discipline":["Biological Sciences"],"thesis:degree_level":["Master's"],"thesis:degree_name":["Master of Science (MS)"],"thesis:institution_name":["Eastern Kentucky University"]},"updated_at":"2026-07-24T02:15:19Z"}