Zolubas, P., Byers, J.A. 1995. Recapture of dispersing
bark beetles Ips typographus L. (Col., Scolytidae)
in pheromone-baited traps: Regression models.
Journal of Applied Entomology 119:285-289. pdf
Parent (re-emerged) spruce bark beetles (Ips typographus L., Col.;
Scolytidae) beginning a second host-seeking flight were collected in
pheromone-baited traps. These beetles were marked with fluorescent
powder of different colors and released from a point source (9-16
June 1989) within a spruce, Picea abies L., forest (Jurbarkas forest
district, Lithuania). Some of the marked beetles were recaptured with
pheromone-baited traps in two experiments: (1) traps at 10 m and (2)
traps 30, 60, 90, and 120 m distances from the release point. Of 5920
and 5030 beetles that took flight in the two experiments, average
recapture rates were 5.64 +- 1.17% (+- SEM) on traps at 10 m
distance, and 1.62 +- 0.21, 0.88 +- 0.23, 0.27 +- 0.08, and 0.03 +-
0.03% on traps at the respective distances from 30 to 120 m.
Parameters of several regression models were fitted with the Simplex
algorithm (SYSTAT statistical software) to recapture data. The best
fitting models were those of power, and an exponential form. A
discussion of the biological meaning of certain coefficients in the
equations is presented with regard to bark beetle dispersal.
Lithuanian Forest Research Inst.
Girionys, 4312 Kaunas