Journal of Economic Entomology (2008) 101, 592604
NanYao Su and SangHee Lee (2008)
Estimating the population size and colony boundary of subterranean termites by using the density functions of directionally averaged capture probability
Journal of Economic Entomology 101 (2), 592604
Abstract: Marked termites were released in a linearconnected foraging arena, and the spatial heterogeneity of their capture probabilities was averaged for both directions at distance r from release point to obtain a symmetrical distribution, from which the density function of directionally averaged capture probability P(x) was derived. We hypothesized that as marked termites move into the population and given sufficient time, the directionally averaged capture probability may reach an equilibrium P_{e} over the distance r and thus satisfy the equal mixing assumption of the markrecapture protocol. The equilibrium capture probability P_{e} was used to estimate the population size N. The hypothesis was tested in a 50m extended foraging arena to simulate the distance factor of field colonies of subterranean termites. Over the 42d test period, the density functions of directionally averaged capture probability P(x) exhibited four phases: exponential decline phase, linear decline phase, equilibrium phase, and postequilibrium phase. The equilibrium capture probability P_{e}, derived as the intercept of the linear regression during the equilibrium phase, correctly projected N estimates that were not significantly different from the known number of workers in the arena. Because the area beneath the probability density function is a constant (50% in this study), preequilibrium regression parameters and P_{e} were used to estimate the population boundary distance l, which is the distance between the release point and the boundary beyond which the population is absent.
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Database assignments for author(s): NanYao Su
Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
Pest and/or beneficial records:
Beneficial  Pest/Disease/Weed  Crop/Product  Country  Quarant.


Coptotermes formosanus 