Predators with two modes of searching: A mathematical model

Knoppien, P.; Reddingius, J.

doi:10.1016/s0022-5193(85)80107-7

Cited by 47 publications

(39 citation statements)

References 6 publications

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“…In agreement with previous studies, we found that track information such as travelling speed and track sinuosity provide insight into variation of prey capture attempts rate (Knoppien & Reddingius 1985, Kareiva & Odell 1987, Benhamou & Bovet 1989, Fauchald & Tveraa 2003. However, the main finding of our study was that, in female southern elephant seals, most of the variability in prey capture attempts behaviour (estimated for the 20 individuals that had not been equipped with accelerometers) using Group C models rate is best ex plained by changes in diving behaviour.…”

Section: Discussionsupporting

confidence: 91%

Predicting prey capture rates of southern elephant seals from track and dive parameters

Vacquié‐Garcia¹,

Guinet²,

Dragon³

et al. 2015

Mar. Ecol. Prog. Ser.

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In the marine environment, track and dive parameter data (obtained using Argos or GPS tags and time-depth recorders) are commonly used to provide proxies for foraging behaviour of marine predators. However, their accuracy is rarely assessed. Recently, the addition of headmounted accelerometers has allowed for detection of prey capture attempts (PCAs) at sea, allowing for more accurate estimations of foraging behaviour. Despite increased numbers of such devices being deployed, their use is still marginal compared with other tools which measure track and dive parameters. The objectives of our study were (1) to identify the most relevant combination of tracking and diving metrics in predicting the frequency of PCAs in female southern elephant seals Mirounga leonina from the Kerguelen Islands, and (2) to apply it to a broader range of individuals for which only tracking and diving data were available. The results of our models were consistent with the optimal foraging theory as well as the optimal diving theory. The model with the best predictive performance was the one that combined both tracking and diving information. However, most of the variability in the number of PCAs could be solely explained by changes in the diving behaviour of seals. Finally, we used the best predictive model on 20 individuals, which had not been fitted with accelerometers, to determine their main foraging zones. The behavioural indicators established in this study constitute a useful ecological tool for population monitoring and conservation purposes.

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Section: Discussionsupporting

confidence: 91%

Predicting prey capture rates of southern elephant seals from track and dive parameters

Vacquié‐Garcia¹,

Guinet²,

Dragon³

et al. 2015

Mar. Ecol. Prog. Ser.

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“…As grey-headed albatross generally forage during the day and rest on the surface during the night (Huin & Prince 1997), we considered plots of birds moving at <10 km h -1 during daylight hours to be indicative of concentrated foraging in an area. This is consistent with theoretical models that predict that high frequency of prey capture leads to an increase in complexity of movement and decreased velocity in order to maximise search effort in profitable areas (Knoppien & Reddingius 1985).…”

Section: Methodssupporting

confidence: 90%

Exploitation of mesoscale oceanographic features by grey-headed albatross Thalassarche chrysostoma in the southern Indian Ocean

Nel

Lütjeharms²,

Pakhomov³

et al. 2001

Mar. Ecol. Prog. Ser.

171

160

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Breeding grey-headed albatross Thalassarche chrysostoma, tracked from Marion Island (Prince Edward Islands) during November-December 1997 and January-February 1998, showed a strong association with mesoscale oceanographic features, as identified by sea surface height anomalies, in the southern Indian Ocean. During incubation, most birds foraged to the north of the island, at the edges of anomalies created by the Agulhas Return Current in the Subtropical Convergence and the Subantarctic zones. In contrast, during chick-rearing all tracked birds foraged to the southwest of the island, at the edges of anomalies along the South-West Indian Ridge. Previous work in this area has shown that these anomalies are in fact eddies that are created as the Antarctic Circumpolar Current crosses the South-West Indian Ridge. Diet samples taken during the chick-rearing period showed a predominance of fresh specimens of the predatory fish Magnisudis prionosa and the squid Martialia hyadesi. Myctophid fish and amphipods Themisto gaudichaudii, both known prey of M. hyadesi, were also well represented in our samples. Diet samples taken from tracked birds showed birds feeding at edges of positive anomalies returning with fresh specimens of M. prionosa and M. hyadesi. Predatory fish and squid are thus presumably concentrated at these features. Eddies formed at the South-West Indian Ridge have also been shown to drift closer to Marion Island, within the foraging range of penguins and seals breeding on Marion Island. We therefore suggest that these mesoscale oceanographic features may be an important component of the 'life-support' system enabling globally significant populations of seabirds and seals to breed at the Prince Edward Islands. KEY WORDS: Albatross · Foraging ecology · Diet · OceanographyResale or republication not permitted without written consent of the publisher

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“…Even though numerous models based on optimization of the net energy gain (Anderson et al, 1997;Knoppien and Reddingius, 1985;O'Brien et al, 1989) predict an optimal strategy for foragers, the large number of unknown parameters used to model the complexity of the energetic constraint, renders a quantitative comparison with experimental data difficult. In the model presented in this section, the search time is assumed to be the relevant quantity optimized by the forager in order to obtain a sufficient daily amount of food and to precede other competing foragers.…”

Section: The Advantage Of Lévy Walks With Respect To Simple Random Walksmentioning

confidence: 99%

Intermittent search strategies

et al. 2011

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This review examines intermittent target search strategies, which combine phases of slow motion, allowing the searcher to detect the target, and phases of fast motion during which targets cannot be detected. We first show that intermittent search strategies are actually widely observed at various scales. At the macroscopic scale, this is for example the case of animals looking for food ; at the microscopic scale, intermittent transport patterns are involved in reaction pathway of DNA binding proteins as well as in intracellular transport. Second, we introduce generic stochastic models, which show that intermittent strategies are efficient strategies, which enable to minimize the search time. This suggests that the intrinsic efficiency of intermittent search strategies could justify their frequent observation in nature. Last, beyond these modeling aspects, we propose that intermittent strategies could be used also in a broader context to design and accelerate search processes.

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Predators with two modes of searching: A mathematical model

Cited by 47 publications

References 6 publications

Predicting prey capture rates of southern elephant seals from track and dive parameters

Predicting prey capture rates of southern elephant seals from track and dive parameters

Exploitation of mesoscale oceanographic features by grey-headed albatross Thalassarche chrysostoma in the southern Indian Ocean

Intermittent search strategies

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