{"id":{"repo_id":"umn","oai_identifier":"oai:conservancy.umn.edu:11299/178920"},"canonical_url":"https://search.dev.ndltd.org/etd/umn/oai:conservancy.umn.edu:11299/178920","repository":{"repo_id":"umn","name":"University of Minnesota","base_url":"https://conservancy.umn.edu/server/oai/request"},"display":{"title":"Mimicking Nature: How water level management on a large reservoir affects walleye (Sander vitreus) spawning habitat","abstract":"The Namakan Reservoir, located on the Minnesota-Ontario border, has been successively managed under two water-level management policies (‘rule curves’) in recent decades. To compare the effects of the rule curves on walleye spawning, I modeled wave energy, ice scour, and habitat availability at 44 spawning locations. Wave energy increased (18% for observed water levels, 6% for modeled water levels) and ice scour decreased 11% (both P < 0.01) over spawning habitat during the most recent rule curve. Observed water level data suggested available spawning habitat on Lake Kabetogama increased 95% (P < 0.01), but availability on Namakan and Sand Point Lakes was unaffected. However, when controlling for weather events, habitat availability increased significantly (Kabetogama = 179%, Namakan = 72%, Sand Point = 93%, P < 0.01) on all three lakes. These findings suggest that the most recent rule curve is likely to improve reproductive success for walleye in the reservoir.","abstract_html":"The Namakan Reservoir, located on the Minnesota-Ontario border, has been successively managed under two water-level management policies (‘rule curves’) in recent decades. To compare the effects of the rule curves on walleye spawning, I modeled wave energy, ice scour, and habitat availability at 44 spawning locations. Wave energy increased (18% for observed water levels, 6% for modeled water levels) and ice scour decreased 11% (both P &lt; 0.01) over spawning habitat during the most recent rule curve. Observed water level data suggested available spawning habitat on Lake Kabetogama increased 95% (P &lt; 0.01), but availability on Namakan and Sand Point Lakes was unaffected. However, when controlling for weather events, habitat availability increased significantly (Kabetogama = 179%, Namakan = 72%, Sand Point = 93%, P &lt; 0.01) on all three lakes. These findings suggest that the most recent rule curve is likely to improve reproductive success for walleye in the reservoir.","abstract_has_math":false,"creators":["Papenfuss, Jason"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-08","date_published":"2015-08","updated_at":"2026-07-24T05:19:54Z","subjects":["Fisheries","Namakan","Reservoirs","Spawning habitat","Walleye","Water levels"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11299/178920","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Papenfuss, Jason"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-04-14T14:19:22Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-04-14T14:19:22Z"]},{"key":"dc:date.issued","label":"Date","values":["2015-08"]},{"key":"dc:type","label":"Dc Type","values":["Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Fisheries","Namakan","Reservoirs","Spawning habitat","Walleye","Water levels"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11299/178920"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["University of Minnesota M.S. thesis.August 2015. Major: Conservation Biology. Advisor: Paul Venturelli. 1 computer file (PDF); vii, 65 pages."]},{"key":"dc:description.abstract","label":"Abstract","values":["The Namakan Reservoir, located on the Minnesota-Ontario border, has been successively managed under two water-level management policies (‘rule curves’) in recent decades. To compare the effects of the rule curves on walleye spawning, I modeled wave energy, ice scour, and habitat availability at 44 spawning locations. Wave energy increased (18% for observed water levels, 6% for modeled water levels) and ice scour decreased 11% (both P < 0.01) over spawning habitat during the most recent rule curve. Observed water level data suggested available spawning habitat on Lake Kabetogama increased 95% (P < 0.01), but availability on Namakan and Sand Point Lakes was unaffected. However, when controlling for weather events, habitat availability increased significantly (Kabetogama = 179%, Namakan = 72%, Sand Point = 93%, P < 0.01) on all three lakes. These findings suggest that the most recent rule curve is likely to improve reproductive success for walleye in the reservoir."]},{"key":"dc:title","label":"Title","values":["Mimicking Nature: How water level management on a large reservoir affects walleye (Sander vitreus) spawning habitat"]}]}],"canonical_facts":{"dc:creator":["Papenfuss, Jason"],"dc:date.accessioned":["2016-04-14T14:19:22Z"],"dc:date.available":["2016-04-14T14:19:22Z"],"dc:date.issued":["2015-08"],"dc:description":["University of Minnesota M.S. thesis.August 2015. Major: Conservation Biology. Advisor: Paul Venturelli. 1 computer file (PDF); vii, 65 pages."],"dc:description.abstract":["The Namakan Reservoir, located on the Minnesota-Ontario border, has been successively managed under two water-level management policies (‘rule curves’) in recent decades. To compare the effects of the rule curves on walleye spawning, I modeled wave energy, ice scour, and habitat availability at 44 spawning locations. Wave energy increased (18% for observed water levels, 6% for modeled water levels) and ice scour decreased 11% (both P < 0.01) over spawning habitat during the most recent rule curve. Observed water level data suggested available spawning habitat on Lake Kabetogama increased 95% (P < 0.01), but availability on Namakan and Sand Point Lakes was unaffected. However, when controlling for weather events, habitat availability increased significantly (Kabetogama = 179%, Namakan = 72%, Sand Point = 93%, P < 0.01) on all three lakes. These findings suggest that the most recent rule curve is likely to improve reproductive success for walleye in the reservoir."],"dc:identifier.uri":["http://hdl.handle.net/11299/178920"],"dc:language.iso":["en"],"dc:subject":["Fisheries","Namakan","Reservoirs","Spawning habitat","Walleye","Water levels"],"dc:title":["Mimicking Nature: How water level management on a large reservoir affects walleye (Sander vitreus) spawning habitat"],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:19:54Z"}