Validation of Dive Foraging Indices Using Archived and Transmitted Acceleration Data: The Case of the Weddell Seal

Heerah, Karine; Cox, Sam L.; Blévin, Pierre; Guinet, Christophe; Charrassin, Jean‐Benoît

doi:10.3389/fevo.2019.00030

Cited by 14 publications

(12 citation statements)

References 85 publications

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“…We calculated hunting depth and time spent hunting during dives using methods developed in [15]. They used high-resolution time-depth data and triaxial accelerometer data from Weddell seals to detect prey capture attempts (PrCAs) and found a strong correlation between vertical sinuosity, swimming speed, and the number of prey capture attempts.…”

Section: (B) Data Processingmentioning

confidence: 99%

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Sex-specific variation in the use of vertical habitat by a resident Antarctic top predator

et al. 2020

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Patterns of habitat use are commonly studied in horizontal space, but this does not capture the four-dimensional nature of ocean habitats (space, depth, and time). Deep-diving marine animals encounter varying oceanographic conditions, particularly at the poles, where there is strong seasonal variation in vertical ocean structuring. This dimension of space use is hidden if we only consider horizontal movement. To identify different diving behaviours and usage patterns of vertically distributed habitat, we use hidden Markov models fitted to telemetry data from an air-breathing top predator, the Weddell seal, in the Weddell Sea, Antarctica. We present evidence of overlapping use of high-density, continental shelf water masses by both sexes, as well as important differences in their preferences for oceanographic conditions. Males spend more time in the unique high-salinity shelf water masses found at depth, while females also venture off the continental shelf and visit warmer, shallower water masses. Both sexes exhibit a diurnal pattern in diving behaviour (deep in the day, shallow at night) that persists from austral autumn into winter. The differences in habitat use in this resident, sexually monomorphic Antarctic top predator suggest a different set of needs and constraints operating at the intraspecific level, not driven by body size.

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Section: (B) Data Processingmentioning

confidence: 99%

“…prey resources and that dives to regularly visited depth layers involve hunting and prey acquisition [10,14,15].…”

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confidence: 99%

Sex-specific variation in the use of vertical habitat by a resident Antarctic top predator

et al. 2020

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“…Moreover, new methods in data abstraction and transmission mean device retrieval is no longer obligatory to obtain the information these instruments record (Cox et al, 2018). For pinniped species, it is now possible to remotely track a suite of dive and foraging metrics such as prey catch attempts (PrCA), swimming effort, dive shape, and surface interval (Cox et al, 2018;Heerah, Cox, Blevin, Guinet, & Charrassin, 2019;Photopoulou, Lovell, Fedak, Thomas, & Matthiopoulos, 2015). As such, the early foraging strategies of free-ranging juveniles that may not return to land can now be observed and, when coupled with double tagging techniques (Drymon & Wells, 2017;Hays, Bradshaw, James, Lovell, & Sims, 2007), examined in relation to survival outcome to gain a more mechanistic understanding of how the two may be related.…”

Section: Introductionmentioning

confidence: 99%

High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability

Cox

Authier

Orgeret

et al. 2019

Ecology and Evolution

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1. High juvenile mortality rates are typical of many long-lived marine vertebrate predators. Insufficient development in dive and forage ability is considered a key driver of this. However, direct links to survival outcome are sparse, particularly in free-ranging marine animals that may not return to land.2. In this study, we conduct exploratory investigations toward early mortality in juvenile southern elephant seals Mirounga leonina. Twenty postweaning pups were equipped with (a) a new-generation satellite relay data tag, capable of remotely transmitting fine-scale behavioral movements from accelerometers, and (b) a location transmitting only tag (so that mortality events could be distinguished from device failures). Individuals were followed during their first trip at sea (until mortality or return to land). Two analyses were conducted. First, the behavioral movements and encountered environmental conditions of nonsurviving pups were individually compared to temporally concurrent observations from grouped survivors. Second, common causes of mortality were investigated using Cox's proportional hazard regression and penalized shrinkage techniques.3. Nine individuals died (two females and seven males) and 11 survived (eight females and three males). All but one individual died before the return phase of their first trip at sea, and all but one were negatively buoyant. Causes of death were variable, although common factors included increased horizontal travel speeds and distances, decreased development in dive and forage ability, and habitat type visited (lower sea surface temperatures and decreased total [eddy] kinetic energy).4. For long-lived marine vertebrate predators, such as the southern elephant seal, the first few months of life following independence represent a critical period, when small deviations in behavior from the norm appear sufficient to increase mortality risk. Survival rates may subsequently be particularly vulnerable to changes in climate and environment, which will have concomitant consequences on the demography and dynamics of populations. | 411COX et al.

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“…Promising approaches to solve the data storage and transmission problem of modern biologgers comprise methods to compress, subset and analyse on-board the data before storing and transmitting the data (Cox et al, 2018;Heerah, Cox, Blevin, Guinet, & Charrassin, 2019), or the use of AI on-board to trigger the sensors to record data only when the animals display the behaviour of interest (Korpela et al, 2019). Here, Nuijten et al (2020) present a new data compression approach for summarizing accelerometer data on-board to increase on-board storage capacity and reduce power requirements for transmitting the data while retaining the original data's information.…”

Section: Handling and Analysing Biologging Datamentioning

confidence: 99%

Biologging Special Feature

Börger

Bijleveld

Fayet

et al. 2020

Journal of Animal Ecology

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Validation of Dive Foraging Indices Using Archived and Transmitted Acceleration Data: The Case of the Weddell Seal

Cited by 14 publications

References 85 publications

Sex-specific variation in the use of vertical habitat by a resident Antarctic top predator

Sex-specific variation in the use of vertical habitat by a resident Antarctic top predator

High mortality rates in a juvenile free‐ranging marine predator and links to dive and forage ability

Biologging Special Feature

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