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

Abstract

. 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.

The Phylogeographic History of the New World Screwworm Fly, Inferred by Approximate Bayesian Computation Analysis

“…In the admixture scenarios, the admixture event time was set as t adm1 for Sc7 and ta dm2 for Sc8, where t adm1 < t 2 and t adm2 > t 2 . Split times were translated into years by assuming a generation time (T) of 23.95 days, calculated from the formula T = α + [ s /(1 - s )] [59], where α is the age of maturity and s is the survival rate of adults, which was estimated as 0.798 for C. hominivorax [60]. The population effective sizes were set as N anc < N NC ≤ N NAG ≤ N SAG , and N1 to N8 > N anc .…”

The new world screwworm: prospective distribution and role of weather in eradication

“…Unless indicated, the values of day j (T ) were gleaned from results in Matlock and Skoda (2009). Using T L , we can estimate the developmental times constants (X j ) in degree-days at a fixed T in the interval 14.5 < T < 35.5 • C using the linear degree-day rule [X j = days j (T ) × (T -T L )].…”

“…Matlock and Skoda (2009) estimated adult daily mortality rates in the field in Costa Rica in the range 0.02-0.2. Matlock and Skoda (2009) estimated adult daily mortality rates in the field in Costa Rica in the range 0.02-0.2.…”

“…The data for screwworm were gleaned from a large but incomplete literature on studies that were often based on laboratory strains of flies (Matlock & Skoda, 2009;Thomas, 1993a). The data for screwworm were gleaned from a large but incomplete literature on studies that were often based on laboratory strains of flies (Matlock & Skoda, 2009;Thomas, 1993a).…”

“…The extensive literature on screwworm was reviewed by Matlock and Skoda (2009). Screwworm females lay batches of eggs on the margin of wounds (Parman & Barrett, 1941;Mangan & Thomas, 1989;Thomas, 1993b) caused by tick bites [Gulf Coast tick, Amblyomma maculatum (Koch)] (Spicer & Dove, 1938), from fighting, in the navel of young animals, and operations such as dehorning, castration, ear-marking and branding (Bruce & Sheely, 1944).…”