Influence of hunger level and prey density on searching behaviour of the reduviid predator <i>Rhynocoris marginatus</i> (Fabricius) (Het., Reduviidae)

Claver, M. A.; Ambrose, Dunston P.

doi:10.1046/j.1439-0418.2003.00708.x

Cited by 9 publications

(11 citation statements)

References 26 publications

(38 reference statements)

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“…Hungry widely‐foraging predators search more intensively for food and are more ready to initiate an attack on their prey (e.g. Whitham & Mathis, 2000; Claver & Ambrose, 2001). They also shift to the local search mode, i.e.…”

Section: Factors Affecting Foraging Behaviour In Trap‐building Prmentioning

confidence: 99%

Foraging decisions and behavioural flexibility in trap‐building predators: a review

2010

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Foraging theory was first developed to predict the behaviour of widely-foraging animals that actively search for prey. Although the behaviour of sit-and-wait predators often follows predictions derived from foraging theory, the similarity between these two distinct groups of predators is not always obvious. In this review, we compare foraging activities of trap-building predators (mainly pit-building antlions and web-building spiders), a specific group of sit-and-wait predators that construct traps as a foraging device, with those of widely-foraging predators. We refer to modifications of the trap characteristics as analogous to changes in foraging intensity. Our review illustrates that the responses of trap-building and widely-foraging predators to different internal and external factors, such as hunger level, conspecific density and predation threat are quite similar, calling for additional studies of foraging theory using trap-building predators. In each chapter of this review, we summarize the response of trap-building predators to a different factor, while contrasting it with the equivalent response characterizing widely-foraging predators. We provide here evidence that the behaviour of trap-building predators is not stereotypic or fixed as was once commonly accepted, rather it can vary greatly, depending on the individual's internal state and its interactions with external environmental factors.

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Section: Factors Affecting Foraging Behaviour In Trap‐building Prmentioning

confidence: 99%

Foraging decisions and behavioural flexibility in trap‐building predators: a review

2010

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“…Based on laboratory and fi eld studies of pest suppression effi ciency, we know that R. marginatus consumes a broad range of prey (Sahayaraj, 2006) and that it specifi -predator adapts its rate of movement to that of the prey, closes in on the prey and captures and holds it tightly by its forelegs, (4) rostral probing -the predator probes various parts of the body of the prey with its rostrum, (5) paralysing the prey -the predator withdraws its rostrum; the prey becomes immobile indicating that paralysis has occurred, (6) feeding -the predator transports the prey to a secluded place and sucks out the body content by inserting its rostrum at one or more places and (7) post-predatory behaviour -the predator drops the carcass and cleans its rostrum, antennae and forelegs. The behavioural elements 1-2 imply that R. marginatus is able to detect and identify its prey from a distance as stated by Haridass et al (1988) and Claver & Ambrose (2003). The time that the predators spend in carrying out each of the fi rst three events (1-3) was summed and used as a collective measure of the time spent locating and capturing the prey (termed approach time, AT).…”

Section: Introductionmentioning

confidence: 99%

Response of the reduviid bug, Rhynocoris marginatus (Heteroptera: Reduviidae) to six different species of cotton pests

Sahayaraj¹,

Kumar²,

Enkegaard³

2016

Eur. J. Entomol.

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“…It is commonly accepted that high hunger levels of active foragers searching for unknown food items generally leads to more intensive search, aimed at “ food-intake maximization ” (FIMax). This strategy may be reflected in either longer search time and distance [ 8 , 11 , 14 ] or in a switch to an area-restricted search where resources are clumped [ 7 , 8 ]. Despite the general finding of such a monotonic response, we suggest that hungry animals facing the risk of starvation and physiological collapse may switch to an alternative strategy aimed at “ energy-expenditure minimization ” (EEMin).…”

Section: Introductionmentioning

confidence: 99%

Mixed strategies of griffon vultures’ (Gyps fulvus) response to food deprivation lead to a hump-shaped movement pattern

et al. 2013

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BackgroundThe need to obtain food is a critical proximate driver of an organism’s movement that shapes the foraging and survival of individual animals. Consequently, the relationship between hunger and foraging has received considerable attention, leading to the common conception that hunger primarily enhances a “food-intake maximization” (FIMax) strategy and intensive search. A complementary explanation, however, suggests a trade-off with precautions taken to reduce the risk of physiological collapse from starvation, under a strategy we denote as “energy-expenditure minimization” (EEMin). The FImax-EEmin trade-off may interact with the forager’s hunger level to shape a complex (non-monotonic) response pattern to increasing hunger. Yet, this important trade-off has rarely been investigated, particularly in free-ranging wild animals.We explored how hunger affects the movements of adult griffon vultures (Gyps fulvus) in southern Israel. Transmitters combining GPS and accelerometers provided high-resolution data on vultures’ movements and behavior, enabling the identification of feeding events and the estimation of food deprivation periods (FDPs, measured in days), which is used as a proxy for hunger.ResultsData from 47 vultures, tracked for 339 ± 36 days, reveal high variability in FDPs. While flight speed, flight straightness and the proportion of active flights were invariant in relation to food deprivation, a clear hump-shaped response was found for daily flight distances, maximal displacements and flight elevation. These movement characteristics increased during the first five days of the FDP sequence and decreased during the following five days. These characteristics also differed between short FDPs of up to four days, and the first four days of longer FDP sequences.These results suggest a switch from FIMax to EEMin strategies along the FDP sequence. They also indicate that vultures’ response to hunger affected the eventual duration of the FDP. During winter (the vultures’ incubation period characterized by unfavorable soaring meteorological conditions), the vultures’ FIMax response was less intensive and resulted in longer starvation periods, while, in summer, more intensive FIMax response to hunger resulted in shorter FDPs.ConclusionsOur results show a flexible, non-monotonic response of free-ranging wild animals to increasing hunger levels, reflecting a trade-off between increasing motivation to find food and the risk of starvation. The proposed trade-off offers a unifying perspective to apparently contradictory or case-specific empirical findings.Electronic supplementary materialThe online version of this article (doi:10.1186/2051-3933-1-5) contains supplementary material, which is available to authorized users.

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Influence of hunger level and prey density on searching behaviour of the reduviid predator Rhynocoris marginatus (Fabricius) (Het., Reduviidae)

Cited by 9 publications

References 26 publications

Foraging decisions and behavioural flexibility in trap‐building predators: a review

Foraging decisions and behavioural flexibility in trap‐building predators: a review

Response of the reduviid bug, Rhynocoris marginatus (Heteroptera: Reduviidae) to six different species of cotton pests

Mixed strategies of griffon vultures’ (Gyps fulvus) response to food deprivation lead to a hump-shaped movement pattern

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