Contribution of habitat type to residency and dispersal choices by overwintered and summer adult Colorado potato beetles

  • Boiteau G
  • Mackinley P
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The walking and flight dispersal of marked overwintered and summer
Colorado potato beetles (CPB), Leptinotarsa decemlineata (Say)
(Coleoptera: Chrysomelidae), released in field box-plots was monitored
simultaneously in six habitats over a period of 4 days. The emigration
out of plots by walking beetles was calculated from the catch in linear
pitfall traps completely surrounding each box-plot and emigration flight
was estimated from the number of beetles missing from the plot or
captured by the trap. Overwintered beetles dispersed sooner after
release than summer beetles. Overall, the mean number of beetles
retained by the habitat was significantly higher in the host habitat
(potato) than in any non-host habitat tested (soybean, pasture, bare
ground, water, woodland). Unexpectedly, there was no or little
difference in overall beetle retention between non-host habitats except
for higher retention in the water habitat. No difference in the ratio of
flight over walking could be detected by the study between overwintered
and summer CPB except in the water and woodland habitats. Twenty-four
hours after release, the highest ratios were obtained in the water and
woodland habitats and the lowest in the bare-ground habitat, but ratios
were similar for all habitats, except water, after 96 h. As a
population, under these experimental conditions, 96 h after release, it
seems that CPB displayed a slight preference for flight over walking,
with walking as a default mode. A fed and starved pre-release treatment
had no effect on dispersal rates or mode of dispersal. Essentially, our
results showed that over a 96-h period, northeastern North American CPB
emigrated at similar rates from the various non-host habitats
encountered, except for water, using walking as much as flight. The host
habitat retained CPB significantly longer than non-host habitats but
with a mode of dispersal ratio similar to that in non-host habitats. The
impact on dispersal of the various habitats encountered by CPB in the
agro-ecosystem was less important than expected suggesting that the
interaction of environmental parameters is likely to have the most
significant impact in determining dispersal rates and dispersal modes.

Author-supplied keywords

  • Chrysomelidae
  • Coleoptera
  • Flight
  • Host
  • Leptinotarsa decemlineata
  • Walking
  • Water
  • Woodland

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  • Gilles Boiteau

  • Pamela Mackinley

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