Foraging pattern of pine siskins and its influence on winter moth survival in an apple orchard

  title={Foraging pattern of pine siskins and its influence on winter moth survival in an apple orchard},
  author={Jens Roland and Susan Jean Hannon and M. Angela Smith},
SummaryForaging by migratory pine siskins in an apple orchard infested with varying densities of winter moth was observed, and winter moth mortality in the presence and absence of birds was recorded. Time spent foraging in a tree and number of birds foraging per tree was positively related to larval density but number of larvae removed per leaf cluster or per unit time was not. Level of defoliation was a better predictor of the number of clusters searched per tree than was prey density. Despite… 

Avian predation on a parasitic fly of cervids during winter: can host-related cues increase the predation risk?

It is demonstrated that pupae are predated by a number of tit species, and the ability of tits to use this host-derived cue seems to be dependent on the prevalence of L. cervi and the period of invasion history, which suggests that it may be a learned behavioural response.

A comparison of three sampling techniques to estimate the population size of caterpillars in trees

  • H. Zandt
  • Environmental Science
  • 2004
Three sampling techniques commonly used to estimate the population size of caterpillars and sawfly larvae in trees (branch samples, frass production, water basins), were compared with respect to

Density-dependent effects of larval dispersal mediated by host plant quality on populations of an invasive insect

It is concluded that larval dispersal is the dominant source of density-dependent larval mortality, may be mediated by induced changes in foliar quality, and likely regulates population densities in New England.

Density-Dependent Survival in the Larval Stage of an Invasive Insect: Dispersal vs. Predation

The suggested role of host plant quality in mediating dispersal means that winter moth population densities in New England appear to be regulated by bottom up forces, aligning with the assumptions of the natural enemy release hypothesis.

The importance of managing the costs and benefits of bird activity for agricultural sustainability

The behaviour of wild animal species in agricultural landscapes may confer benefits to growers through the provision of ecosystem services (e.g. control of agricultural pests) or inflict costs

of Animal Spatial patterns of depletion imposed by foraging Ecology 1997 , 66 , 481-494 vertebrates : theory , review and meta-analysis

1. A simulation model is used to examine the spatial pattern of resource depletion imposed by vertebrates foraging in a heterogeneous environment; this may have important consequences for the

After the Decline : What Maintains Low Winter Moth Density after Successful Biological Control ?

Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use



Some Effects of Avian Predators on the Western Spruce Budworm 1 in North Central Washington

Single-branch exclosures were used to examine the effects of avian predators on Choristoneura occidentalis Freeman and revealed that apparent differences in predation may have been influenced by differences in natural budworm densities.

Caterpillar Leaf Damage, and the Game of Hide‐and‐Seek with Birds

In an aviary, field—captured Black—capped Chickadees, Parus atricapillus, learned to forage preferentially at trees with either artificially or caterpillar—damaged leaves. The birds also

Influence of a predator on the optimal foraging behaviour of sticklebacks (Gasterosteus aculeatus L.)

Three-spined sticklebacks' foraging behaviour changes such that they attack swarm regions of lower density which provide a lower feeding rate but should increase their ability to detect an approaching predator, predicted by a model using Pontryagin's principle of maximisation.

Initial Deposit and Disappearance Rates of Various Insecticides as Affected by Forage Crop Species

Three years of field studies showed that the initial deposit and the rate of decomposition of residues of insecticides vary with the forage species. More insecticide was deposited upon application

Occurrence of the winter moth, Operophtera brumata (Lepidoptera: Geometridae), on southern Vancouver Island, British Columbia.

An expanding outbreak of hardwood-defoliating geometrid larvae has existed on southern Vancouver Island, B.C., since at least 1972 and by 1977 the outbreak had become severe over an estimated 120 km2 in the Victoria and Saanich land districts.

Nest defense and central place foraging: A model and experiment

SummaryA graphical model presented here indicates that a nest-defending forager should stay closer to its nest, forage for shorter times per patch, and deliver smaller loads than predicated for

The Numerical Response of Avian and Mammalian Predators during a Gradation of the Spruce Budworm

The present study shows that some species of predators increase when prey density increases while others decrease; thus it is necessary to distinguish between a direct numerical response and an inverse numerical response.

Population Dynamics of the Spruce Budworm Choristoneura Fumiferana

The weight of evidence is against the idea that an outbreak occurs in an "epicenter" and spreads to the surrounding areas through moth dispersal, and the commonly accepted theory of outbreaks based on the dichotomy of endemic and epidemic equilibrium states is reviewed.

Lagging Partial Preferences for Cryptic Prey: A Signal Detection Analysis of Great Tit Foraging

An analogy between foraging for cryptic prey and basic signal detection problems is developed and an optimization model predicts partial preferences for cryptic predators, with the probability of attack varying between 0 and 1 as a function of the relative frequency of prey.