+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Risk sensitivity foraging mode in an ambush predator

Risk sensitivity foraging mode in an ambush predator

Ecology (Washington D C) 67(5): 1180-1185

We present a stochastic model for foraging mode, where the mode is idealized as a "sit-and-wait" strategy or as a strategy of active movement between foraging sites. We direct the model's assumptions toward the behavior of certain (female) orb-web spiders, where both temporal and spatial stochasticity govern the number of prey taken by a predator. At a given web site, prey are captured randomly through time according to a Poisson process. Spatial heterogeneity is incorporated by allowing the probabilistic rate of prey capture to vary randomly among potential web sites. We assume that an efficient predator should minimize the probability of capturing fewer prey than required to survive and reproduce during a single season. The model shows that in the same environment the two strategies yield the same expected number of captured prey, but the variance in the number of prey captured is greater for the sit-and-wait predator. An approximation to the model's solution indicates that a predator should be risk-averse and employ the mobile strategy in an environment where the expected number of prey captures exceeds the requirement. But in an environment where the requirement exceeds the expected number of prey captures, a predator should be risk-prone and employ the sit-and-wait strategy.

(PDF 0-2 workdays service: $29.90)

Accession: 006345746

Download citation: RISBibTeXText

Related references

Foraging tactics of an ambush predator the effects of substrate attributes on prey availability and predator feeding success. Behavioral Ecology and Sociobiology 65(7): 1367-1375, 2011

'Movement- and attack-based indices of foraging mode and ambush foraging in some gekkonid and agamine lizards from southern Africa. Amphibia-Reptilia 20(4): 391-399, 1999

Foraging behaviour and prey selection by the ambush entangling predator Pleurobrachia bachei. Ecology (Washington D C): 676: 1493-1501, 1986

Foraging behavior and prey selection by the ambush entangling predator pleurobrachia bachei. Ecology (Washington D C) 67(6): 1493-1501, 1986

Thermal influences on foraging ability: Body size, posture and cooling rate of an ambush predator, the python Morelia spilota. Functional Ecology 11(3): 342-347, 1997

The effect of prey density on ambush site changes in an extreme ambush type predator. American Midland Naturalist 108(2): 250-255, 1982

Temporal effects of hunting on foraging behavior of an apex predator: Do bears forego foraging when risk is high?. Oecologia 182(4): 1019-1029, 2016

Optimal foraging when predation risk increases with patch resources an analysis of pollinators and ambush predators. Oikos 119(5): 835-840, 2010

Sequential analyses of foraging behavior and attack speed in ambush and widely foraging lizards. Adaptive Behavior 20(1): 16-31, 2012

Absence of prey chemical discrimination by tongue-flicking in an ambush-foraging lizard having actively foraging ancestors. Ethology. 97(4): 317-328, 1994

Predator-induced modifications to diving behavior vary with foraging mode. Oikos 120(7): 1005-1012, 2011

The interplay between foraging mode, habitat structure, and predator presence in antlions. Behavioral Ecology and Sociobiology 62(7): 1185-1192, 2008

The importance of pesticide exposure duration and mode on the foraging of an agricultural pest predator. Bulletin of Environmental Contamination and Toxicology 94(2): 178-182, 2015

Predator foraging mode shifts affecting mortality of juvenile fishes during the subarctic spring bloom. Canadian Journal of Fisheries and Aquatic Sciences 54(3): 364-376, 1999

Foraging mode of Australolacerta rupicola FitzSimons, 1933 Sauria Lacertidae evidence of seasonal variation in an extremely active predator?. Journal of Natural History 44.47-48: 2941-2953, 2010