Claim · model-written summary
At high densities, aphid growth rates did not decline as density increased in individual plots.
Triticum aestivumVerbatim
e0“the growth rates did not decrease with increasing aphid density”
e1“aphid species, Metopolophium dirhodum (Walker), Rhopalosiphum padi (L.), and Sitobion avenae (F.), on winter wheat”
Title
Natural enemy ravine revisited: the importance of sample size for determining population growth
Vojtěch Jarošík; Alois Honěk; Anthony F. G. Dixon Ecological Entomology 2003. doi:10.1046/j.1365-2311.2003.00485.x
Other claims from this paper (10)
- Observation At low aphid densities, growth was undetectable in individual plots.
- Observation At high densities, aphid populations grew exponentially in individual plots.
- Observation Pooled plot data consistently showed significant aphid growth.
- Association Growth rates in pooled data declined significantly at the highest densities.
- Observation Estimated intrinsic increase for M. dirhodum ranged from 0.010 to 0.026.
- Observation Estimated intrinsic increase for R. padi ranged from 0.0071 to 0.011.
- Observation Estimated intrinsic increase for S. avenae ranged from 0.00078 to 0.0061 on leaves.
- Observation Estimated intrinsic increase for S. avenae ranged from 0.0015 to 0.13 on ears.
- Mechanism The authors attributed apparent absent growth at low plot densities to small samples.
- Mechanism The authors concluded that the natural enemy ravine reflects undetectable increase at low densities unless samples are very large.