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Seedcorn Maggot (Diptera: Anthomyiidae) Reproductive Biology and Techniques for Examining Ovarian Dynamics

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Seedcorn Maggot (Diptera: Anthomyiidae) Reproductive Biology and Techniques for Examining Ovarian Dynamics University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Faculty Publications: Department of Entomology Entomology, Department of 1984 Seedcorn Maggot (Diptera: Anthomyiidae) Reproductive Biology and Techniques for Examining Ovarian Dynamics L. G. Higley Iowa State University, [email protected] L. P. Pedigo Iowa State University Follow this and additional works at: https://digitalcommons.unl.edu/entomologyfacpub Part of the Entomology Commons Higley, L. G. and Pedigo, L. P., "Seedcorn Maggot (Diptera: Anthomyiidae) Reproductive Biology and Techniques for Examining Ovarian Dynamics" (1984). Faculty Publications: Department of Entomology. 292. https://digitalcommons.unl.edu/entomologyfacpub/292 This Article is brought to you for free and open access by the Entomology, Department of at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Faculty Publications: Department of Entomology by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Seedcorn Maggot (Diptera: Anthomyiidae) Reproductive Biology and Techniques for Examining Ovarian Dynamics L. G. HIGLEY ANDL. P. PEDIGO Department of Entomology, Iowa State University, Ames, Iowa 50011 J. Econ. Entomol. 77: 1149-1153 (1984) ABSTRACT We developed techniques for examining ovarian dynamics of the seedcorn maggot, Delia platura (Meigen), and delineated detailed procedures for ovarian dissections and classifications.A three-class ovarian rating system was devised and physiological ages for each class were determined. The preovipositional period was 36 degree-days (DD) in the field and 100 DD in the laboratory. No ovarian development was observed unlessfemales had been given a protein food source. All females with ovarian development had mated. OVARIANDYNAMICS,or gonadotrophic cycles, have Some authors (Anderson 1964, Vogt et al. 1974, been studied in a number of muscomorphous (cy- Woodburn et al. 1978) have pointed out that times c1orrhaphous) Diptera as a method for determin- associated with ovarian developmental stages usu- ing population age structure and phenology. An- ally represented minimum ages. Ovarian devel- derson (1964) discussed the philosophy and opment may be delayed by cool temperatures or principles behind this approach. At a gross level, by nutritional deficiencies, specifically, the lack of females may be classified as having laid a batch a protein meal. Obviously, studies on the ovarian of eggs (parous) or as not having oviposited (nul- dynamics of a species must consider both temper- liparous). More refined schemes characterize the ature and diet, as well as time. degree of ovarian development and ascribe devel- We examined seedcorn maggot (SCM), Delia opment times to distinct ovarian development platura (Meigen) (Diptera: Anthomyiidae), ovari- classes. The time between ovarian classes can be an dynamics in order to develop a procedure for highly dependent on temperature and nutritional determining SCM population age structure and factors. phenology. Questions regarding SCM reproduc- Despite the potential usefulness of this tech- tive biology were also considered as a part of this nique, ovarian dynamics have been examined in examination. relatively few species of the Muscomorpha, and primarily in the Muscidae and Calliphoridae. For Materials and Methods example, Anderson (1964) described ovarian de- velopment in the muscids Fannia canicularis (L.), Adult female SCM were sampled in 1982 and Musca domestica L., Muscina stabulans (Fallen), 1983 by using two cone traps baited with a mol- Myospila meditabunda F., Ophyra leucostoma lases-yeast mixture. Traps were located south of (Wiedemann), Orthellia caesarion (Meigen), and Ames, Iowa, and flies were collected every 2 days Stomoxys calcitrans (L.), as well as in the calli- from early April to mid-July. Adult flies collected phorid Calliphora terraenovae (Meigen). Miller in cone traps were taken to the laboratory in clear and Treece (1968) rated Musca autumnalis plastic bags for dissection. DeGeer females as nulliparous, uni-, bi-, or tripa- Female SCM of known ovipositional histories rous. A 17-class ovarian development system, based were obtained by collecting pupae from soil in on parity and the degree of vitellogenesis, was con- the field. Pupae were maintained singly in cups structed for Musca vetustissima Walker (Tyndale- in the laboratory until adults emerged. Adult SCM Biscoe and Hughes 1969). A similar scheme, using that emerged were then placed in cages containing 16 ovarian stages, has been developed for Lucilia water and surcrose or water, sucrose, and yeast. cuprina (Wiedemann) (Vogt et al. 1974). Females were removed from these cages at daily Ovarian dynamics in the Anthomyiidae have intervals, for 1 week, and dissected. Adults and been examined previously for only one species, the pupae were maintained in the laboratory at 21DC onion maggot, Delia antiqua (Meigen) (Liu et al. and approximately 85% RH. 1982). A three-class system was developed for rat- To use SCM ovarian dynamics in population ing onion maggot ovarian development, with studies, a procedure had to be developed that al- classes consisting of newly emerged flies, flies with lowed rapid dissections and identifications of ovar- developing oocytes, and unproductive flies. De- ian classes. On most sampling days, between 40 velopmental times were not determined for these and 80 flies were examined, and on peak days, up classes, but the classification did allow the discrim- to 120 flies were dissected. Flies were killed, iden- ination of early second- and third-generation flies. tified, and sexed. Females were pinned, ventum 1149 1150 JOURNAL OF ECONOMIC ENTOMOLOGY Vol. 77, no. 5 up, and the ovaries were removed for detailed ex- amination (Fig. 1). Ovaries were placed in 7% sa- line solution in cells of a clear glass depression plate. Ovarioles were separated to give a clear view of the pedicels and examined under a dissecting microscope. In 1982, the spermathecae of approx- imately 100 females were removed, placed on mi- croscope slides with saline, and crushed under cov- er slips. The spermathecae were examined under a compound microscope for the presence of sper- matozoa. Seedcorn maggot females infected with Ento- mophthora muscae (Cohn) Freseuius had consid- erable degeneration of the reproductive system and could not be classified. A number of problems with or limitations of the dissection procedure were encountered. Collected flies died quickly, especially under high tempera- tures, and the ovaries of dead flies decayed rap- idly. No procedure could be developed a preserve to preserve SCM ovaries for later examination. Freezing destroyed reproductive tissues, and al- cohol washed out color, making identifications dif- ficult or impossible. Although maintaining living flies at cool temperatures (above freezing) seemed to prevent further ovarian development, it also produced unacceptably high mortality. Conse- quently, SCM females had to be dissected within 2 to 3 h of collection. A further difficulty arose when some SCM females collected in traps had distended guts filled with the molasses bait. If the gut was penetrated during dissection, the repro- ductive system was tinted yellow from the molas- ses, but rinsing the ovaries with saline removed this discoloration. Temperature accumulations between ovarian classes were measured in the laboratory and from field observations. A 3.9°C threshold for ovarian development was used, which agreed with our lab- oratory observations and those of Yathom (1970). Laboratory-reared females of known age were dis- sected and ovarian development rated. Ratings were determined without prior knowledge of fe- male age in order to preclude possible bias. In Fig. 1. Removal of ovaries from SCM female. 1982 and 1983, the duration of ovarian classes and the preovipositional period also was calculated from field data. Early in the season, when temperatures were low and development protracted, we mea- quently, no meaningful subdivisions of the parous sured differences between the midpoints of peaks class could be used. Similarly, development in the for each ovarian class or between the times when nulliparous class was so rapid that subdivisions classes disappeared. based on the degree of vitellogenesis did not add sufficient information to warrant the substantial effort involved in distinguishing classes. However, Results and Discussion newly emerged females could be readily differ- Ovarian Development Classes. During 1982, we entiated from nulliparous flies with developing 00- examined alternative systems for rating SCM ovar- cytes, so we arrived at a three-class ovarian rating ian development. Seed corn maggot females could system as follows: be separated into nulliparous and parous groups. I. Nulliparous (newly emerged). This was usu- These classes then could be subdivided on the basis ally the easiest class to differentiate and, with ex- of vitellogenesis or other characteristics. In SCM, perience, could be recognized during the dissec- after the first batch of eggs was laid, subsequent tions, so complete removal of the ovaries often was ovipositions could not be differentiated; conse- unnecessary. Females in this class had extremely October 1984 HIGLEY AND PEDIGO: SEEDCORN MAGGOT REPRODUCTIVE BIOLOGY 1151 Table I. Length of the SCM preovipositional period from the literature Time DD Type of Source (days)- (3.goC study temp (DC) threshold) Harris et al. 1966 Laboratory 8-22.2 146.4 Harukawa et al. 1934 Laboratory 23-8 94.3
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