{"id":{"repo_id":"mo-state","oai_identifier":"oai:bearworks.missouristate.edu:theses-1633"},"canonical_url":"https://search.dev.ndltd.org/etd/mo-state/oai:bearworks.missouristate.edu:theses-1633","repository":{"repo_id":"mo-state","name":"Missouri State University","base_url":"https://bearworks.missouristate.edu/do/oai/"},"display":{"title":"Population Dynamics and Productivity of the Prosobranch Snail Goniobasis Potosiensis","abstract":"Abundance, growth, and production of Goniobasis potosiensis were studied from March 1981 to February 1982, at three locations in the James River, Missouri. A total of 24,004 snails were collected and measured. The species was univoltine and individuals lived from 19 to 21 months. Recruitment occurred from June to August and followed a progressive wave from upstream down. Mean lengths ranged from 0.7 mm to 13.7 mm with the maximum sized snail being 19.27 mm long. The sex ratio for all three stations was 1.2, with a significant excess of males. No sexual dimorphism in length was found. Growth was interrupted by winter in the coexisting cohorts. Abundance averaged 1179 individuals /sq m and ranged from 0 to 6288. Biomass, computed from length-frequency data using an empirically determined length-weight relationship, averaged 3.77 g ash-free dry wt of live matter /sq m and ranged from 0 to 8.85. Annual production estimates were 10.32, 6.79, and 4.44 g/sq m from upriver to down river. Turnover ratios were 8.25, 3.47, and 4.39 on stations A, B, and C, respectively.","abstract_html":"Abundance, growth, and production of Goniobasis potosiensis were studied from March 1981 to February 1982, at three locations in the James River, Missouri. A total of 24,004 snails were collected and measured. The species was univoltine and individuals lived from 19 to 21 months. Recruitment occurred from June to August and followed a progressive wave from upstream down. Mean lengths ranged from 0.7 mm to 13.7 mm with the maximum sized snail being 19.27 mm long. The sex ratio for all three stations was 1.2, with a significant excess of males. No sexual dimorphism in length was found. Growth was interrupted by winter in the coexisting cohorts. Abundance averaged 1179 individuals /sq m and ranged from 0 to 6288. Biomass, computed from length-frequency data using an empirically determined length-weight relationship, averaged 3.77 g ash-free dry wt of live matter /sq m and ranged from 0 to 8.85. Annual production estimates were 10.32, 6.79, and 4.44 g/sq m from upriver to down river. Turnover ratios were 8.25, 3.47, and 4.39 on stations A, B, and C, respectively.","abstract_has_math":false,"creators":["Flora, Stephen John"],"institution":null,"degree_name":"Master of Science in Biology","degree_level":"Masters","degree_discipline":"Biology","degree_department":null,"school":null,"contributors":["Milton Topping"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1982,"date_issued":"1982-12-01T08:00:00Z","date_published":"1982-12-01T08:00:00Z","updated_at":"2026-07-24T03:15:42Z","subjects":["Biology"],"languages":[],"rights":["© Stephen John Flora"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://bearworks.missouristate.edu/theses/632","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Milton Topping"]},{"key":"dc:creator","label":"Author","values":["Flora, Stephen John"]}]},{"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 John Flora"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://bearworks.missouristate.edu/theses/632"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Abundance, growth, and production of Goniobasis potosiensis were studied from March 1981 to February 1982, at three locations in the James River, Missouri. A total of 24,004 snails were collected and measured. The species was univoltine and individuals lived from 19 to 21 months. Recruitment occurred from June to August and followed a progressive wave from upstream down. Mean lengths ranged from 0.7 mm to 13.7 mm with the maximum sized snail being 19.27 mm long. The sex ratio for all three stations was 1.2, with a significant excess of males. No sexual dimorphism in length was found. Growth was interrupted by winter in the coexisting cohorts. Abundance averaged 1179 individuals /sq m and ranged from 0 to 6288. Biomass, computed from length-frequency data using an empirically determined length-weight relationship, averaged 3.77 g ash-free dry wt of live matter /sq m and ranged from 0 to 8.85. Annual production estimates were 10.32, 6.79, and 4.44 g/sq m from upriver to down river. Turnover ratios were 8.25, 3.47, and 4.39 on stations A, B, and C, respectively."]},{"key":"dc:title","label":"Title","values":["Population Dynamics and Productivity of the Prosobranch Snail Goniobasis Potosiensis"]}]}],"canonical_facts":{"dc:contributor":["Milton Topping"],"dc:creator":["Flora, Stephen John"],"dc:description.abstract":["Abundance, growth, and production of Goniobasis potosiensis were studied from March 1981 to February 1982, at three locations in the James River, Missouri. A total of 24,004 snails were collected and measured. The species was univoltine and individuals lived from 19 to 21 months. Recruitment occurred from June to August and followed a progressive wave from upstream down. Mean lengths ranged from 0.7 mm to 13.7 mm with the maximum sized snail being 19.27 mm long. The sex ratio for all three stations was 1.2, with a significant excess of males. No sexual dimorphism in length was found. Growth was interrupted by winter in the coexisting cohorts. Abundance averaged 1179 individuals /sq m and ranged from 0 to 6288. Biomass, computed from length-frequency data using an empirically determined length-weight relationship, averaged 3.77 g ash-free dry wt of live matter /sq m and ranged from 0 to 8.85. Annual production estimates were 10.32, 6.79, and 4.44 g/sq m from upriver to down river. Turnover ratios were 8.25, 3.47, and 4.39 on stations A, B, and C, respectively."],"dc:identifier":["https://bearworks.missouristate.edu/theses/632"],"dc:rights":["© Stephen John Flora"],"dc:subject":["Biology"],"dc:title":["Population Dynamics and Productivity of the Prosobranch Snail Goniobasis Potosiensis"],"thesis:degree_discipline":["Biology"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science in Biology"]},"updated_at":"2026-07-24T03:15:42Z"}