Abstract
Fifth instars of the hemipteran predator Perillus bioculatus (F.) were observed as they attacked neonate Leptinotarsa decemlineata (Say) larvae on potato plants. Observations were conducted at prey densities ranging from one to 100 prey per plant, and standard functional response models were fit to the predation rates obtained. Neither the type II nor the type III functional response curves provided a satisfactory fit to the data. The observed attack rate was neither constant over all prey densities (as in the type II model), nor an increasing function of prey density (as in the type III model). Instead, it declined over prey densities from one to 25 and then increased substantially at the density of 50. A possible explanation for the observed pattern is that area-restricted search following prey consumption led to additional successful feeding events at high densities but not at low densities. The mean observed handling time was essentially equal to an estimate based on the type III model and prey density did not have a Significant influence on per-prey handling times.
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Claims 5
Claim · model-written summary
Neither type II nor type III functional response models fit observed predation rates satisfactorily.
- Taxon
- potato plants
Solanum tuberosumt0 - Outcome
- satisfactory fite0
- Comparator
- type II nor the type III functional response curvese0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato plants”
e0“Neither the type II nor the type III functional response curves provided a satisfactory fit to the data.”
Claim · model-written summary
Predator attack rate declined from one to 25 prey per plant.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- prey densitiese0
- Direction
- declinede0
- Setting
- prey densities from one to 25e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato plants”
e0“it declined over prey densities from one to 25”
Claim · model-written summary
Predator attack rate increased substantially at prey density 50.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- densitye0
- Direction
- increasede0
- Setting
- density of 50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato plants”
e0“then increased substantially at the density of 50.”
Claim · model-written summary
Observed handling time was essentially equal to the type III model estimate.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- mean observed handling timee0
- Direction
- essentially equale0
- Comparator
- an estimate based on the type III modele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato plants”
e0“The mean observed handling time was essentially equal to an estimate based on the type III model”
Claim · model-written summary
Prey density did not significantly influence per-prey handling times.
- Taxon
- potato plantsSolanum tuberosumt0
- Outcome
- per-prey handling timese0
- Direction
- did not have a Significant influencee0
- Setting
- prey densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato plants”
e0“prey density did not have a Significant influence on per-prey handling times.”