{"id":{"repo_id":"mo-state","oai_identifier":"oai:bearworks.missouristate.edu:theses-2004"},"canonical_url":"https://search.dev.ndltd.org/etd/mo-state/oai:bearworks.missouristate.edu:theses-2004","repository":{"repo_id":"mo-state","name":"Missouri State University","base_url":"https://bearworks.missouristate.edu/do/oai/"},"display":{"title":"Food Size And Foraging Site Selection In A Breeding Population Of Red- Winged Blackbirds (Agelaius Phoeniceus)","abstract":"The size of organisms fed to nestling red-winged blackbirds was significantly larger than if selection of food were random. There also appeared to be a selection for \"soft-bodied\" items. This may be due to selection for soft anatomy per se or selection as a function of the ease of capture. The average size of organisms captured in the marsh was significantly larger than those in the adjacent field. This indicated that in terms of feeding efficiency, the field is a less profitable place to forage than the marsh. Female adult red-winged blackbirds were found to feed significantly less often on the field than males. This reduces intraspecific competition and may increase feeding efficiency. It was postulated that there exist two levels of selection during nestling feeding: a selection for larger food items and for foraging sites. As female red-winged blackbirds feed the nestlings unassisted by males, it is necessary for the females to maximize feeding efficiency by selecting the largest items compatible with the energy expense of capture and by selecting foraging locations where these larger items can be found.","abstract_html":"The size of organisms fed to nestling red-winged blackbirds was significantly larger than if selection of food were random. There also appeared to be a selection for "soft-bodied" items. This may be due to selection for soft anatomy per se or selection as a function of the ease of capture. The average size of organisms captured in the marsh was significantly larger than those in the adjacent field. This indicated that in terms of feeding efficiency, the field is a less profitable place to forage than the marsh. Female adult red-winged blackbirds were found to feed significantly less often on the field than males. This reduces intraspecific competition and may increase feeding efficiency. It was postulated that there exist two levels of selection during nestling feeding: a selection for larger food items and for foraging sites. As female red-winged blackbirds feed the nestlings unassisted by males, it is necessary for the females to maximize feeding efficiency by selecting the largest items compatible with the energy expense of capture and by selecting foraging locations where these larger items can be found.","abstract_has_math":false,"creators":["Wilson, Stephen Wallace"],"institution":null,"degree_name":"Master of Science in Biology","degree_level":"Masters","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Tom Stombough"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1975,"date_issued":"1975-05-01T07:00:00Z","date_published":"1975-05-01T07:00:00Z","updated_at":"2026-07-24T03:16:00Z","subjects":["Biology"],"languages":[],"rights":["© Stephen Wallace Wilson"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://bearworks.missouristate.edu/theses/1003","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Tom Stombough"]},{"key":"dc:creator","label":"Author","values":["Wilson, Stephen Wallace"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Biology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["© Stephen Wallace Wilson"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://bearworks.missouristate.edu/theses/1003"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The size of organisms fed to nestling red-winged blackbirds was significantly larger than if selection of food were random. There also appeared to be a selection for \"soft-bodied\" items. This may be due to selection for soft anatomy per se or selection as a function of the ease of capture. The average size of organisms captured in the marsh was significantly larger than those in the adjacent field. This indicated that in terms of feeding efficiency, the field is a less profitable place to forage than the marsh. Female adult red-winged blackbirds were found to feed significantly less often on the field than males. This reduces intraspecific competition and may increase feeding efficiency. It was postulated that there exist two levels of selection during nestling feeding: a selection for larger food items and for foraging sites. As female red-winged blackbirds feed the nestlings unassisted by males, it is necessary for the females to maximize feeding efficiency by selecting the largest items compatible with the energy expense of capture and by selecting foraging locations where these larger items can be found."]},{"key":"dc:title","label":"Title","values":["Food Size And Foraging Site Selection In A Breeding Population Of Red- Winged Blackbirds (Agelaius Phoeniceus)"]}]}],"canonical_facts":{"dc:contributor":["Tom Stombough"],"dc:creator":["Wilson, Stephen Wallace"],"dc:description.abstract":["The size of organisms fed to nestling red-winged blackbirds was significantly larger than if selection of food were random. There also appeared to be a selection for \"soft-bodied\" items. This may be due to selection for soft anatomy per se or selection as a function of the ease of capture. The average size of organisms captured in the marsh was significantly larger than those in the adjacent field. This indicated that in terms of feeding efficiency, the field is a less profitable place to forage than the marsh. Female adult red-winged blackbirds were found to feed significantly less often on the field than males. This reduces intraspecific competition and may increase feeding efficiency. It was postulated that there exist two levels of selection during nestling feeding: a selection for larger food items and for foraging sites. As female red-winged blackbirds feed the nestlings unassisted by males, it is necessary for the females to maximize feeding efficiency by selecting the largest items compatible with the energy expense of capture and by selecting foraging locations where these larger items can be found."],"dc:identifier":["https://bearworks.missouristate.edu/theses/1003"],"dc:rights":["© Stephen Wallace Wilson"],"dc:subject":["Biology"],"dc:title":["Food Size And Foraging Site Selection In A Breeding Population Of Red- Winged Blackbirds (Agelaius Phoeniceus)"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science in Biology"]},"updated_at":"2026-07-24T03:16:00Z"}