Prey Processing in Central Place Foragers

Rands, Sean A.; Houston, Alasdair I.; Gasson, Catherine E.

doi:10.1006/jtbi.1999.1048

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…They provided significantly more plucked and decapitated prey to their nestlings. By completely removing these indigestible food parts, parents provide chicks with food items that are more energy efficient to digest, and that potentially reduce the risk of ectoparasite exposure to chicks [35]. This behavior may also reduce the chances of attracting predators to the nest by avoiding a buildup of prey remains around the nest area [35].…”

Section: Discussionmentioning

confidence: 99%

Translocation of Threatened New Zealand Falcons to Vineyards Increases Nest Attendance, Brooding and Feeding Rates

2012

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Anthropogenic landscapes can be rich in resources, and may in some cases provide potential habitat for species whose natural habitat has declined. We used remote videography to assess whether reintroducing individuals of the threatened New Zealand falcon Falco novaeseelandiae into a highly modified agricultural habitat affected the feeding rates of breeding falcons or related breeding behavior such as nest attendance and brooding rates. Over 2,800 recording hours of footage were used to compare the behavior of falcons living in six natural nests (in unmanaged, hilly terrain between 4 km and 20 km from the nearest vineyard), with that of four breeding falcon pairs that had been transported into vineyards and nested within 500 m of the nearest vineyard. Falcons in vineyard nests had higher feeding rates, higher nest attendance, and higher brooding rates. As chick age increased, parents in vineyard nests fed chicks a greater amount of total prey and larger prey items on average than did parents in hill nests. Parents with larger broods brought in larger prey items and a greater total sum of prey biomass. Nevertheless, chicks in nests containing siblings received less daily biomass per individual than single chicks. Some of these results can be attributed to the supplementary feeding of falcons in vineyards. However, even after removing supplementary food from our analysis, falcons in vineyards still fed larger prey items to chicks than did parents in hill nests, suggesting that the anthropogenic habitat may be a viable source of quality food. Although agricultural regions globally are rarely associated with raptor conservation, these results suggest that translocating New Zealand falcons into vineyards has potential for the conservation of this species.

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Section: Discussionmentioning

confidence: 99%

Translocation of Threatened New Zealand Falcons to Vineyards Increases Nest Attendance, Brooding and Feeding Rates

2012

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“…Using a similar framework, Lafferty (1992) adopted an economic approach to determine the conditions under which predators should consume infected prey. This may be extended to explore, for instance, the evolution of prey processing, where the handling time component occurs mainly for the predator to remove parasites from the prey (Stephens and Krebs 1986, Ydenberg 1998, Rands et al 2000. Such foraging decisions by the predator will then affect the evolution of parasite and intermediate host strategies, requiring a game-theoretic approach.…”

Section: Discussionmentioning

confidence: 99%

The Impact of Parasite Manipulation and Predator Foraging Behavior on Predator–prey Communities

Fenton

Rands

2006

Ecology

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Parasites are known to directly affect their hosts at both the individual and population level. However, little is known about their more subtle, indirect effects and how these may affect population and community dynamics. In particular, trophically transmitted parasites may manipulate the behavior of intermediate hosts, fundamentally altering the pattern of contact between these individuals and their predators. Here, we develop a suite of population dynamic models to explore the impact of such behavioral modifications on the dynamics and structure of the predator-prey community. We show that, although such manipulations do not directly affect the persistence of the predator and prey populations, they can greatly alter the quantitative dynamics of the community, potentially resulting in high amplitude oscillations in abundance. We show that the precise impact of host manipulation depends greatly on the predator's functional response, which describes the predator's foraging efficiency under changing prey availabilities. Even if the parasite is rarely observed within the prey population, such manipulations extend beyond the direct impact on the intermediate host to affect the foraging success of the predator, with profound implications for the structure and stability of the predator-prey community.

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“…After a forager acquires prey it must decide how much energy (or time) is partitioned to processing and transporting that resource. By processing prey at the point of acquisition, the forager reduces the costs of transporting an item, enhances resource digestibility, and reduces the bulk of the item to facilitate consumption or carrying (see Kaspari, 1990;Rands et al, 2000). Cumulatively, applications of the CPF models show that at greater distances from central places, organisms become more selective by transporting loads/prey that are larger-sized (Cuthill and Kacelnik, 1990;Fryxell andDoucet, 1991, Jackson, 2001;Stephens and Krebs, 1986, pp.…”

Section: Central Place Foraging Models and The Zooarchaeological Recordmentioning

confidence: 95%

“…CPF models consider how the costs of transporting a resource influences resource choice, load size, distances between foraging patches, and the placement of central places. Recent modifications of classic CPF models highlight how prey preparation, by removing low value and indigestible parts (Kaspari, 1991) or concentrating the nutritional content of the prey by crushing low value parts (Sherry and McDade, 1982), can influence the transport costs and decisions of central place foragers (Cuthill and Kacelnik, 1990;Kaspari, 1990;Rands et al, 2000;Sodhi, 1992;Ydenberg, 1998). After a forager acquires prey it must decide how much energy (or time) is partitioned to processing and transporting that resource.…”

Section: Central Place Foraging Models and The Zooarchaeological Recordmentioning

confidence: 98%

What Explains the Carcass Field Processing and Transport Decisions of Contemporary Hunter-Gatherers? Measures of Economic Anatomy and Zooarchaeological Skeletal Part Representation

Lupo

2006

J Archaeol Method Theory

120

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This paper uses rationale derived from central place foraging models to explore the factors that guide the carcass processing and transport decisions of modern hunters. Using data derived from butchering experiments, I test different economic indices that purportedly reflect the field processing and transport decisions of contemporary African Hadza hunter-gatherers. The results show that no single index predicts part processing and transport for the species examined in this analysis. Processing and transport decisions are, however, patterned in ways that are consistent with theoretical predictions. While similar processes likely guide carcass treatment and transport decisions among all hunter-gatherers, different ecological, social, and historical constraints define the range of solutions to problems involving carcass treatment. In this specific example, intertaxonomic differences in carcass size and bone properties constrain how the trade-offs between field processing and transport costs are resolved. I conclude by suggesting ways in which analysts might make use of central place foraging rationale and models to explain variation in skeletal representation and abundances across time and space.

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Prey Processing in Central Place Foragers

Cited by 19 publications

References 26 publications

Translocation of Threatened New Zealand Falcons to Vineyards Increases Nest Attendance, Brooding and Feeding Rates

Translocation of Threatened New Zealand Falcons to Vineyards Increases Nest Attendance, Brooding and Feeding Rates

The Impact of Parasite Manipulation and Predator Foraging Behavior on Predator–prey Communities

What Explains the Carcass Field Processing and Transport Decisions of Contemporary Hunter-Gatherers? Measures of Economic Anatomy and Zooarchaeological Skeletal Part Representation

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