{"id":{"repo_id":"unt","oai_identifier":"info:ark/67531/metadc3280"},"canonical_url":"https://search.dev.ndltd.org/etd/unt/info:ark/67531/metadc3280","repository":{"repo_id":"unt","name":"University of North Texas","base_url":"https://digital.library.unt.edu/oai/"},"display":{"title":"A Physiological Age-Grading System for Female Hydrellia pakistanae Deonier (Diptera: Ephydridae)","abstract":"Conflicting opinions about the effectiveness of H. pakistanae as a biological control agent for hydrilla prompt researchers to find a method for assessing the fly's success. Developing a physiological age-grading system for the fly using ovarian morphology to detect changes in reproductive activity is useful for evaluating reproductive status of the fly in field populations. Changes in the appearance of follicular relics in ovaries with oviposition provide a reliable method to estimate fecundity. Characteristics of follicular relics were used to develop a system with eight physiological age classes, three nulliparous and five parous. Changes that occur in the fat body were used to assist in classification of nulliparous females or those with low egg counts.","abstract_html":"Conflicting opinions about the effectiveness of H. pakistanae as a biological control agent for hydrilla prompt researchers to find a method for assessing the fly's success. Developing a physiological age-grading system for the fly using ovarian morphology to detect changes in reproductive activity is useful for evaluating reproductive status of the fly in field populations. Changes in the appearance of follicular relics in ovaries with oviposition provide a reliable method to estimate fecundity. Characteristics of follicular relics were used to develop a system with eight physiological age classes, three nulliparous and five parous. Changes that occur in the fat body were used to assist in classification of nulliparous females or those with low egg counts.","abstract_has_math":false,"creators":["Lenz, Jennifer Marie"],"institution":"University of North Texas","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Kennedy, James H.","Grodowitz, Michael J.","Waller, William T.","Dickson, Kenneth L."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-12","date_published":"2002-12","updated_at":"2026-07-24T05:34:52Z","subjects":["Hydrellia.","Hydrilla.","Aquatic weeds -- Biological control.","biological control","hydrilla","morphology","age-grading"],"languages":["English"],"rights":["Use restricted to UNT Community","Copyright","Lenz, Jennifer Marie","Copyright is held by the author, unless otherwise noted. All rights reserved."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 52122080","https://digital.library.unt.edu/ark:/67531/metadc3280/","ark: ark:/67531/metadc3280"],"render_values":[{"text":"oclc: 52122080","href":null,"code":true},{"text":"https://digital.library.unt.edu/ark:/67531/metadc3280/","href":"https://digital.library.unt.edu/ark:/67531/metadc3280/","code":true},{"text":"ark: ark:/67531/metadc3280","href":null,"code":true}]}]},"links":{"outbound_url":"https://doi.org/10.12794/metadc3280","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kennedy, James H.","Grodowitz, Michael J.","Waller, William T.","Dickson, Kenneth L."]},{"key":"dc:creator","label":"Author","values":["Lenz, Jennifer Marie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2002-12"]},{"key":"dc:publisher","label":"Institution","values":["University of North Texas"]},{"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":["Hydrellia.","Hydrilla.","Aquatic weeds -- Biological control.","biological control","hydrilla","morphology","age-grading"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["Use restricted to UNT Community","Copyright","Lenz, Jennifer Marie","Copyright is held by the author, unless otherwise noted. All rights reserved."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 52122080","doi: 10.12794/metadc3280","https://digital.library.unt.edu/ark:/67531/metadc3280/","ark: ark:/67531/metadc3280"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Conflicting opinions about the effectiveness of H. pakistanae as a biological control agent for hydrilla prompt researchers to find a method for assessing the fly's success. Developing a physiological age-grading system for the fly using ovarian morphology to detect changes in reproductive activity is useful for evaluating reproductive status of the fly in field populations. Changes in the appearance of follicular relics in ovaries with oviposition provide a reliable method to estimate fecundity. Characteristics of follicular relics were used to develop a system with eight physiological age classes, three nulliparous and five parous. Changes that occur in the fat body were used to assist in classification of nulliparous females or those with low egg counts."]},{"key":"dc:format","label":"Dc Format","values":["Text"]},{"key":"dc:title","label":"Title","values":["A Physiological Age-Grading System for Female Hydrellia pakistanae Deonier (Diptera: Ephydridae)"]}]}],"canonical_facts":{"dc:contributor":["Kennedy, James H.","Grodowitz, Michael J.","Waller, William T.","Dickson, Kenneth L."],"dc:creator":["Lenz, Jennifer Marie"],"dc:date":["2002-12"],"dc:description":["Conflicting opinions about the effectiveness of H. pakistanae as a biological control agent for hydrilla prompt researchers to find a method for assessing the fly's success. Developing a physiological age-grading system for the fly using ovarian morphology to detect changes in reproductive activity is useful for evaluating reproductive status of the fly in field populations. Changes in the appearance of follicular relics in ovaries with oviposition provide a reliable method to estimate fecundity. Characteristics of follicular relics were used to develop a system with eight physiological age classes, three nulliparous and five parous. Changes that occur in the fat body were used to assist in classification of nulliparous females or those with low egg counts."],"dc:format":["Text"],"dc:identifier":["oclc: 52122080","doi: 10.12794/metadc3280","https://digital.library.unt.edu/ark:/67531/metadc3280/","ark: ark:/67531/metadc3280"],"dc:language":["English"],"dc:publisher":["University of North Texas"],"dc:rights":["Use restricted to UNT Community","Copyright","Lenz, Jennifer Marie","Copyright is held by the author, unless otherwise noted. All rights reserved."],"dc:subject":["Hydrellia.","Hydrilla.","Aquatic weeds -- Biological control.","biological control","hydrilla","morphology","age-grading"],"dc:title":["A Physiological Age-Grading System for Female Hydrellia pakistanae Deonier (Diptera: Ephydridae)"],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:34:52Z"}