Animal Movements in Heterogeneous Landscapes: Identifying Profitable Places and Homogeneous Movement Bouts

Barraquand, Frédéric; Benhamou, Simon

doi:10.1890/08-0162.1

Cited by 284 publications

(328 citation statements)

References 50 publications

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“…We used residence time (RT [48]) to identify ARS bouts in all foraging tracks (adehabitatLT R package [49]). To avoid artificial inflation of RTs, we excluded tracking locations recorded during hours of darkness (because gannets are diurnal foragers) and all locations within a radius of 1 km of the colony (because gannets do not forage here but do frequently rest on the water).…”

Section: Behavioural Classificationmentioning

confidence: 99%

“…[44]; average scale of search 9.1 + 1.9 km, with nested finer-scale search at 1.5 + 0.8 km). We used RT at each interpolated location to distinguish ARS from transit using an approach based on Lavielle segmentation [48], using both the mean and variance of each series with an 'Lmin' value of 3 (minimum number of observations in each segment) and a 'Kmax' value of 10 (maximum number of segments in movement burst; electronic supplementary material, figure S1). We classified segments as periods of ARS or transit using a custom-written R function that identifies each segment as either above or below a threshold of RT (seconds), with thresholds specified as mean values across all trips at each radius, resulting in a binary response variable (i.e.…”

Section: Behavioural Classificationmentioning

confidence: 99%

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Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird

Scales

Miller

Embling

et al. 2014

J. R. Soc. Interface.

118

102

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The oceanographic drivers of marine vertebrate habitat use are poorly understood yet fundamental to our knowledge of marine ecosystem functioning. Here, we use composite front mapping and high-resolution GPS tracking to determine the significance of mesoscale oceanographic fronts as physical drivers of foraging habitat selection in northern gannets Morus bassanus. We tracked 66 breeding gannets from a Celtic Sea colony over 2 years and used residence time to identify area-restricted search (ARS) behaviour. Composite front maps identified thermal and chlorophyll-a mesoscale fronts at two different temporal scales-(i) contemporaneous fronts and (ii) seasonally persistent frontal zones. Using generalized additive models (GAMs), with generalized estimating equations (GEE-GAMs) to account for serial autocorrelation in tracking data, we found that gannets do not adjust their behaviour in response to contemporaneous fronts. However, ARS was more likely to occur within spatially predictable, seasonally persistent frontal zones (GAMs). Our results provide proof of concept that composite front mapping is a useful tool for studying the influence of oceanographic features on animal movements. Moreover, we highlight that frontal persistence is a crucial element of the formation of pelagic foraging hotspots for mobile marine vertebrates.

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Section: Behavioural Classificationmentioning

confidence: 99%

Section: Behavioural Classificationmentioning

confidence: 99%

Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird

Scales

Miller

Embling

et al. 2014

J. R. Soc. Interface.

118

102

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show abstract

“…That individual movement trajectories represent an amalgamation of different behavioural states is increasingly recognized [22]. A useful biological characterization of a particular behavioural state is the mean (determinism) and variance (stochasticity) of Figure 1.…”

Section: Pairwise Movement Synchrony and A Movement Coherence Spectrummentioning

confidence: 99%

A framework for understanding the architecture of collective movements using pairwise analyses of animal movement data

Polansky

Wittemyer

2010

J. R. Soc. Interface.

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The study of collective or group-level movement patterns can provide insight regarding the socio-ecological interface, the evolution of self-organization and mechanisms of inter-individual information exchange. The suite of drivers influencing coordinated movement trajectories occur across scales, resulting from regular annual, seasonal and circadian stimuli and irregular intra-or interspecific interactions and environmental encounters acting on individuals. Here, we promote a conceptual framework with an associated statistical machinery to quantify the type and degree of synchrony, spanning absence to complete, in pairwise movements. The application of this framework offers a foundation for detailed understanding of collective movement patterns and causes. We emphasize the use of Fourier and wavelet approaches of measuring pairwise movement properties and illustrate them with simulations that contain different types of complexity in individual movement, correlation in movement stochasticity, and transience in movement relatedness. Application of this framework to movements of freeranging African elephants (Loxodonta africana) provides unique insight on the separate roles of sociality and ecology in the fission -fusion society of these animals, quantitatively characterizing the types of bonding that occur at different levels of social relatedness in a movement context. We conclude with a discussion about expanding this framework to the context of larger (greater than three) groups towards understanding broader population and interspecific collective movement patterns and their mechanisms.

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“…These percentiles were chosen because they represent the core area of use and the home-range of an individual respectively (Burt 1943, Barraquand & Benhamou 2008. This matrix of overlapping proportions is asymmetrical which means that, for example, animal id13"s 50% isopleth overlaps 20% (0.2) with animal id28, but id28"s 50%…”

Section: Inter-individual Foraging Site Fidelity: Differences In Corementioning

confidence: 99%

Cross-seasonal foraging site fidelity of subantarctic fur seals: implications for marine conservation areas

Wege¹,

Tosh²,

Bruyn³

et al. 2016

Mar. Ecol. Prog. Ser.

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Marine top-predators show fidelity to foraging areas with predictable high-quality food patches.Areas of predictable prey yield are of conservation importance and telemetry data aid in identifying such areas. This study examined colony specific and intra-individual foraging site fidelity of lactating Subantarctic fur seals (Arctocephalus tropicalis) from Marion Island (46°54"S, 37°45"E) during summer and winter, comparing commitment to foraging areas across seasons. Thirty-one females were tracked in 2009-2013 resulting in 111 foraging trips for analyses. Inter-annually, preferred foraging areas in summer were consistently ≈200 km due east of Marion Island towards the Gallieni Rise. Summer individuals' core utilization areas overlapped by an estimated 32.84% (CI: 24.53% -41.94%). Seals responded to a decrease in regional productivity in winter by foraging in more distant alternative areas. In winter, individuals changed their travelling direction to north-east of Marion Island and foraged further afield, around the Del Caño Rise and along the South-west Indian Ridge. Despite preferring some foraging areas in winter, there was a low amount of overlap 6.03% (CI 4.02% -9.16%) of individual core utilization areas. The foraging grounds identified in this study have not been included in prior conservation assessments and are important in conserving for this globally 1 significant, and currently declining, population of Subantarctic fur seals and perhaps other toppredators breeding at Marion Island as well. Differences between winter and summer preferred foraging areas highlight the importance of sampling during different seasons when using telemetry data for the identification of potential pelagic conservation areas.

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Animal Movements in Heterogeneous Landscapes: Identifying Profitable Places and Homogeneous Movement Bouts

Cited by 284 publications

References 50 publications

Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird

Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird

A framework for understanding the architecture of collective movements using pairwise analyses of animal movement data

Cross-seasonal foraging site fidelity of subantarctic fur seals: implications for marine conservation areas

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