Comparing the horizontal and vertical approaches used to identify foraging areas of two diving marine predators

Planque, Yann; Huon, Mathilde; Caurant, Florence; Pinaud, David; Vincent, Cécile

doi:10.1007/s00227-019-3636-8

Cited by 7 publications

(14 citation statements)

References 72 publications

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“…Horizontal and vertical movements are generally recorded at different spatiotemporal resolutions. Consequently, studies which seek to quantify marine predator foraging behaviour have traditionally considered only one aspect of movement; examining either horizontal or vertical movement separately and using optimal foraging theory (OFT) to make foraging inferences [ 12 , 13 ]. Originating within terrestrial ecology, OFT originally tested mainly two-dimensional horizontal movement models, but this conceptual framework is widely used to examine the mechanisms and strategies an animal uses to acquire food across aquatic, terrestrial and aerial species.…”

Section: Introductionmentioning

confidence: 99%

Horizontal-vertical movement relationships: Adélie penguins forage continuously throughout provisioning trips

et al. 2021

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Background Diving marine predators forage in a three-dimensional environment, adjusting their horizontal and vertical movement behaviour in response to environmental conditions and the spatial distribution of prey. Expectations regarding horizontal-vertical movements are derived from optimal foraging theories, however, inconsistent empirical findings across a range of taxa suggests these behavioural assumptions are not universally applicable. Methods Here, we examined how changes in horizontal movement trajectories corresponded with diving behaviour and marine environmental conditions for a ubiquitous Southern Ocean predator, the Adélie penguin. Integrating extensive telemetry-based movement and environmental datasets for chick-rearing Adélie penguins at Béchervaise Island, we tested the relationships between horizontal move persistence (continuous scale indicating low [‘resident’] to high [‘directed’] movement autocorrelation), vertical dive effort and environmental variables. Results Penguins dived continuously over the course of their foraging trips and lower horizontal move persistence corresponded with less intense foraging activity, likely indicative of resting behaviour. This challenges the traditional interpretation of horizontal-vertical movement relationships based on optimal foraging models, which assumes increased residency within an area translates to increased foraging activity. Movement was also influenced by different environmental conditions during the two stages of chick-rearing: guard and crèche. These differences highlight the strong seasonality of foraging habitat for chick-rearing Adélie penguins at Béchervaise Island. Conclusions Our findings advance our understanding of the foraging behaviour for this marine predator and demonstrates the importance of integrating spatial location and behavioural data before inferring habitat use.

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Section: Introductionmentioning

confidence: 99%

Horizontal-vertical movement relationships: Adélie penguins forage continuously throughout provisioning trips

et al. 2021

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“…The rest of the year they spend most of their time at sea, exhibiting higher foraging activity. Despite a partial trophic segregation in time, they can have similar diets (Thompson et al, 1996;Wilson & Hammond, 2019), diving behavior (Baechler et al, 2002;Lesage et al, 1999;Thompson et al, 1991), and potentially similar foraging grounds in coastal areas (Planque et al, 2020;Thompson et al, 1996). Both species disperse in coastal waters on the continental shelf and can use the same haulout sites (Thompson et al, 1996;Vincent et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Diets of harbour seals in this area are essentially composed of small flatfish from nurseries in the summer period (Spitz et al, 2015), and their foraging areas are very coastal and close to the BDS haulout site (Planque et al, 2020). Grey seal foraging areas include these coastal areas as well as areas further offshore (Planque et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Trophic niche overlap between sympatric harbour seals (Phoca vitulina) and grey seals (Halichoerus grypus) at the southern limit of their European range (Eastern English Channel)

Planque

Spitz

Authier

et al. 2021

Ecology and Evolution

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“…Assessment of the seals' foraging locations -We analysed the seals' dives to identify their foraging behaviour following (Planque et al, 2020). Dives with a maximum depth < 3 meters and a dive duration < 30 seconds were removed, considering that very shallow and short dives are unlikely representing foraging behaviour.…”

Section: Foraging Habitat Selectionmentioning

confidence: 99%

“…These square dives are assumed to represent foraging (Bjørge et al, 1995;Hindell et al, 1991;LeBoeuf et al, 1988;Thompson et al, 1991). We set a minimum TAD threshold to the 3rd quartile (i.e.75% of dives) of each individual dive distribution according to their shape in order to select 25% most U-shaped individual dives (Planque et al, 2020). Long duration dives with a very low vertical descent speed (assumed to be sleeping dives) were excluded from the analysis for each individual: we excluded 10% of the most U-shaped dives characterized by the lowest vertical descent speeds.…”

Section: Foraging Habitat Selectionmentioning

confidence: 99%

Fine scale foraging habitat selection by two diving central place foragers in the Northeast Atlantic

Huon

Planque

Jessopp

et al. 2020

Preprint

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1. Understanding the animal-habitat relationship at local scale is crucial in ecology, particularly to develop strategies for wildlife management and conservation. As this relationship is governed by environmental features and intra and inter-specific interactions, habitat selection of a population may vary locally between its core and edges. 2. This is particularly true for central place foragers, such as grey and harbour seals, whose trends in numbers vary among different regions in the Northeast Atlantic. Here, we aimed at studying how foraging habitat selection may vary locally with the influence of population trends and physical habitat features 3. Using GPS/GSM tags deployed in grey and harbour seal colonies of contrasting sizes, we investigate spatial patterns and foraging habitat selection by comparing trip characteristics and home range similarities, and fitting GAMM to the seal distribution and environmental data respectively. 4. We show that grey seal foraging habitat selection and spatial patterns differed markedly between regions. Grey seals may select environmental characteristics for their foraging habitat accounting for local differences in prey consumed. Spatial patterns were different might depend on local seal density and regional productivity, located from inshore to offshore areas for the limit ranges and core population respectively. Our results on foraging habitat selection reflected the coastal and sedentary behaviour of harbour seals. We found no difference in spatial patterns between colonies, except for the Inner Hebrides where seals foraged further, potentially reflecting density dependence pressure, as the number in this colony is higher. 5. These results suggest that local conditions might have a strong influence on population spatial ecology, highlighting as well the relevance of studying foraging habitat selection based on foraging behaviour at fine geographical scale, particularly if species are managed within regional units.

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Comparing the horizontal and vertical approaches used to identify foraging areas of two diving marine predators

Cited by 7 publications

References 72 publications

Horizontal-vertical movement relationships: Adélie penguins forage continuously throughout provisioning trips

Horizontal-vertical movement relationships: Adélie penguins forage continuously throughout provisioning trips

Trophic niche overlap between sympatric harbour seals (Phoca vitulina) and grey seals (Halichoerus grypus) at the southern limit of their European range (Eastern English Channel)

Fine scale foraging habitat selection by two diving central place foragers in the Northeast Atlantic

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