A Physiological Age-Grading System for Female Hydrellia pakistanae Deonier (Diptera: Ephydridae)

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.

Grantor dc:publisher

University of North Texas

Year dc:date

2002

Author dc:creator

• Lenz, Jennifer Marie

Contributors dc:contributor

• Kennedy, James H.
• Grodowitz, Michael J.
• Waller, William T.
• Dickson, Kenneth L.

• Hydrellia.
• Hydrilla.
• Aquatic weeds -- Biological control.
• biological control
• hydrilla
• morphology
• age-grading

Statement dc:rights

• Use restricted to UNT Community
• Copyright
• Lenz, Jennifer Marie
• Copyright is held by the author, unless otherwise noted. All rights reserved.

Language dc:language

English

Identifier

oclc: 52122080
https://digital.library.unt.edu/ark:/67531/metadc3280/
ark: ark:/67531/metadc3280

OAI identifier oai:identifier

info:ark/67531/metadc3280