Life Cycle of the Screw-Worm Reared in Outdoor Cages Near Veracruz City, Mexico1

Davis, Richard A.; Camino, M.

doi:10.1093/jee/61.3.824

Cited by 5 publications

(9 citation statements)

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“…The Pradel model cannot fit age‐specific survival rates (Pradel, 1996; Franklin, 2001). Although evidence from laboratory studies suggests that survivorship may be age‐specific (Spates & Hightower, 1967, 1970; Davis & Camino, 1968; Milward de Azevedo et al , 1992), survivorship can be closely approximated by constant survival rates. Furthermore, field estimates for Studies 1–3 (Parker & Welch, 1992 [Fig.…”

Section: Methodsmentioning

confidence: 99%

“…New World screwworm mortality rates have been estimated in the laboratory (e.g. Crystal, 1967a, 1967b; DeVaney & Garcia, 1975) and death rates can be inferred from the results of some outdoor cage (Davis & Camino, 1968) and field (Thomas & Chen, 1990) studies. Recruitment rates can be calculated from laboratory estimates of life history parameters (references included in the Appendix).…”

Section: Introductionmentioning

confidence: 99%

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Mark–recapture estimates of recruitment, survivorship and population growth rate for the screwworm fly, Cochliomyia hominivorax

Matlock

Skoda

2009

Medical Vet Entomology

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. Pradel model mark -release -recapture estimates of survivorship, , recruitment, f , and the rate of density-independent population growth, , are presented for eight mark -recapture studies of the screwworm Cochliomyia hominivorax (Coquerel) (Diptera: Calliphoridae) from Costa Rica, totalling 19 573 released and 4476 recaptured flies. Corroborative estimates of survivorship and the rate of population growth based on an extensive review of the literature are also reported. Weighted-mean ± standard error of the mean (SEM) mark -release -recapture estimates of survivorship, recruitment and the rate of population growth were = 0.798 ± 0.008, f = 0.193 ± 0.008 and = 1.005 ± 0.002, respectively. Population doubling time was estimated from at 139 days. Estimates of and from the literature both exceeded those calculated by mark -recapture methods and estimates of population doubling times were consequently shorter.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mark–recapture estimates of recruitment, survivorship and population growth rate for the screwworm fly, Cochliomyia hominivorax

Matlock

Skoda

2009

Medical Vet Entomology

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“…There is empirical evidence that screwworm populations vary directly with temperature (Parman, 1945). This is because pupal development (Davis & Camino, 1968;Parish, 1945) and ovarian development (Krafsur & Garcia, 1978;Adams, 1979) are temperature dependent. Egg and larval development, on the other hand, should demonstrate little seasonal variation because host temperatures are constant.…”

Section: R E S U L T Smentioning

confidence: 99%

Screwworm, Cochliomyia hominivorax, eradication in Texas: effects of climate and strains of sterile flies

Krafsur

1985

Entomologia Exp Applicata

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Screwworm case incidence in a meteorologically and ecologically homogeneous region of Texas being treated with sterile flies was analyzed. Data from 19 years suggested that annual cases were not correlated with temperatures, rainfall, or crop moisture index. Cases in winter and summer were only minimally influenced by temperatures. No statistical relation between screwworm outbreaks and the meteorological variables was found. No‐convincing relation was found between strains of sterile flies released and screwworm cases. These data suggest that execution of the sterile male technique was decisive in the numbers of cases realized. The ultimate eradication of screwworms from the region is strong indication that the sterile male technique is robust and that intrinsic reproductive isolating mechanisms did not become prevalent among screwworm flies. Résumé L'élimination de Cochliomyia hominivorax Coq. (Dipt. Calliphoridae) au Texas: effets du climat et des souches de mouches stériles. L'analyse de la présence de cohortes de larves de C. hominivorax dans une région climatiquement et écologiquement homogène du Texas, où des populations sont activies toute l'année ne révèle aucune corrélation entre les pullulations, les pluies, la température ou le déficit d'évaporation et l'humidité excessive. Aucune corrélation n'a pu être décelêe entre les lignées de mouches stériles libérées et les cohortes de larves. Ces résultats suggèrent que la technique d'utilisation des mâles stériles est bonne et que des mécanismes intrinsèques d'isolement reproductif ne sont pas encore devenus importants chez C. hominivorax.

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“…During this period, the larvae remain in direct contact with the host tissues from which they feed. As larval development advances, there is a significant increase in size, such that the larvae can reach 17mm long (Davis & Camino 1968). Third-stage larvae release themselves from the host and fall to the ground for pupation, which lasts about seven days during the summer and up to 2 months during the winter.…”

Section: Introductionmentioning

confidence: 99%

Proteolytic activity of excretory/secretory products of Cochliomyia hominivorax larvae (Diptera: Calliphoridae)

et al. 2016

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The protein profiles and proteolytic activity of the excretory secretory products (E/SP) of the first (L1), second (L2) and third (L3) larval stages of Cochliomyia hominivorax were studied in the laboratory. Analysis on the E/SP protein profile was carried out using polyacrylamide gel containing sodium dodecyl sulfate (SDS-PAGE). The E/SP of each larval stage (L1, L2 and L3) treated with protease inhibitors, containing 30μg, 40μg and 50μg of protein, was applied to the 10% polyacrylamide gel. The proteolytic activity of the crude E/SP was analyzed in gels copolymerized with gelatin and by colorimetric assays using azocasein as a substrate, with the characterization of the proteases using synthetic inhibitors. Different protein profiles were observed for the larval instars, with L1 presenting the most complex profile. Nevertheless, various protein bands were observed that were common to all the larval instars. The E/SP of all the instars showed proteolytic activity on gelatin, evidenced by proteolysis zones, predominantly with apparently higher molecular masses in L1, while for L2 and L3 the proteolysis zones could also be observed in regions with lower masses. Tests with protease inhibitors using gelatin as substrate showed that the E/SP of larvae were mainly composed of serine proteases. Additionally, inhibition was observed in L2 E/SP treated previously with EDTA, an inhibitor of metalloproteases. The assays with azocasein revealed a gradual increase of proteolytic activity on this substrate with larval development progress, with the strongest inhibitions being observed after treatments with 3,4-dichloroisocoumarin (DCI) for E/SP of L1, L2 and L3. These results suggest that C. hominivorax larvae produce different proteases, a fact that can be related to the parasite's vital processes for survival, such as penetration into the host's tissues and nutrition during the larval stage.

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Life Cycle of the Screw-Worm Reared in Outdoor Cages Near Veracruz City, Mexico1

Cited by 5 publications

References 0 publications

Mark–recapture estimates of recruitment, survivorship and population growth rate for the screwworm fly, Cochliomyia hominivorax

Mark–recapture estimates of recruitment, survivorship and population growth rate for the screwworm fly, Cochliomyia hominivorax

Screwworm, Cochliomyia hominivorax, eradication in Texas: effects of climate and strains of sterile flies

Proteolytic activity of excretory/secretory products of Cochliomyia hominivorax larvae (Diptera: Calliphoridae)

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