Dive data obtained from telemetry tracking of ten harbour seals (Phoca vitulina) and twelve grey seals (Halichoerus grypus), captured in the Baie de Somme, France, in 2008 and 2012, and fitted with GPS/GSM tags

Date 2021-04-14
Temporal extent 2008-10 -2013-01
Author(s) Planque YannORCID1, Caurant Florence1, 2, Vincent CécileORCID1
Affiliation(s) 1 : Centre d’Etudes Biologique de Chizé, CEBC, UMR 7372 CNRS / La Rochelle Université, 5 allée de l'Océan, 17000 La Rochelle, France
2 : Observatoire Pelagis, UMS 3462 CNRS / La Rochelle Université, 5 allée de l'Océan, 17000 La Rochelle, France
DOI 10.17882/80016
Publisher SEANOE
Note The dataset consists of: (1) a table of dive data registered by GPS/GSM tags fitted on captured harbour and grey seals (cf. ‘Dive data’). Each row is a dive performed by a seal, i.e. when the animal reached depths exceeding 1.5 m. It includes different parameters describing the dive (e.g. dive duration, maximum depth, intermediate depths, percentage area). (2) a metadata file describing the parameters registered for each dive (cf. ‘Dive metadata’). (3) a table summarising the characteristics of captured seal individuals, including their sex, body mass, total length, and girth (cf. ‘Individual characteristics data’). (4) a metadata file explaining what are the characteristics obtained on each seal individual captured (cf. ‘Individual characteristics metadata’).
Keyword(s) Telemetry, Bio-logging, Tracking, Tags, Dives, Diving behaviour, Behaviour, Top predators, Marine mammals, Pinnipeds, Harbour seals, Grey Seals, Eastern English Channel, Baie de Somme, France
Abstract

Dive data were obtained from telemetry studies performed on ten harbour seals (Phoca vitulina) and twelve grey seals (Halichoerus grypus) captured in the Baie de Somme, France, in 2008 and 2012, respectively. These seal individuals were fitted with Fastloc GPS/GSM tags, developed by the Sea Mammal Research Unit (University of StAndrews, UK). These tags include a Fastloc™ GPS, a GSM modem (for data transmission), and wet-dry, pressure and temperature sensors, as well a microprocessor (for on-board data processing) (McConnell et al., 2004). A dive event was registered by the tag when the seal reached depths exceeding 1.5 m, and different parameters were thus measured: start date and time, maximum depth, dive duration, post-dive surface duration, the “percent area” (to identify dive shape, cf. TAD index by Fedak et al., 2001), and nine intermediate depth points (each 10% of the dive duration). GPS locations were obtained (around every 20 minutes) when the seal was at the surface at sea, and the location of each dive data was therefore spatially interpolated from these GPS locations. GPS data are already available on http://seamap.env.duke.edu/dataset/2030 for harbour seals and on http://seamap.env.duke.edu/dataset/2026 for grey seals seals. Dive data can provide essential information on the behaviour of seals, including foraging, and can therefore be used to identify foraging areas (as already done on part of these data, cf. Planque et al., 2020). For information, the δ13C and δ15N stable isotopes were measured along the whiskers of almost all of these seal individuals, and the data are already available on SEANOE (https://doi.org/10.17882/76528).

Licence CC-BY-NC
Acknowledgments We thank the fieldwork participants for their work capturing seals for telemetry studies. These include participants from La Rochelle Université (LIENSs, CEBC, Observatoire Pelagis), the Sea Mammal Research Unit (SMRU), Picardie Nature, the Office Français de la Biodiversité (OFB), the Zoo de la Flèche and the Université de Liège (Belgium). The dive data presented here were obtained through telemetry studies funded by La Compagnie du Vent in 2008 and by the Région Poitou-Charente and the Contrat de Plan Etat-Région (Poitou-Charentes) in 2012. All procedures performed in studies involving harbour and grey seals were in accordance with the ethical standards of the French Ministry of the Environment as seals were caught and instrumented under license numbers 08/346/DEROG and 11/874/DEROG, delivered by this Ministry. Data are archived here as part of Yann Planque’s PhD project funded by La Rochelle Université and by the French Ministry of Higher Education, Research and Innovation.
Sensor metadata

Metadata of ‘Dive data’:
Data_type = Type of data in row (here dive data)
Species = Species of seal captured. Pv = Harbour seal (Phoca vitulina); Hg = Grey seal (Halichoerus grypus).
Capture_site = Capture site (here Baie de Somme, France)
Type_tag = Type of tag fitted on the seal (here GPS/GSM tag)
Tag_number = Tag number
Seal_ID = ID of individual seal
Trip_nb = Number of individual trip at sea. A trip is defined as all time at sea between two haulout events.
FID_dive = Unique identifier of dive (by species)
ds_date = Date/Hour at the dive start
start_lat = Latitude at the dive start (decimal degrees). Dive location interpolated from GPS data registered at the surface.
start_lon = Longitude at the dive start (decimal degrees). Dive location interpolated from GPS data registered at the surface.
SURF_DUR = Post-dive surface duration (seconds)
DIVE_DUR = Dive duration (seconds)
MAX_DEP = Maximum depth (meters)
PERCENT_AREA = Percentage of the "maximum dive trapezoid" covered by the dive. Allowing the calculation of the Time Allocation at Depth index (TAD; cf. Fedak et al., 2001).
D1 = Depth point 1 (meters) at 10% of the dive duration
D2 = Depth point 2 (meters) at 20% of the dive duration
D3 = Depth point 3 (meters) at 30% of the dive duration
D4 = Depth point 4 (meters) at 40% of the dive duration
D5 = Depth point 5 (meters) at 50% of the dive duration
D6 = Depth point 6 (meters) at 60% of the dive duration
D7 = Depth point 7 (meters) at 70% of the dive duration
D8 = Depth point 8 (meters) at 80% of the dive duration
D9 = Depth point 9 (meters) at 90% of the dive duration

 

Metadata of ‘Individual characteristics data’:
Species = Species of seal captured. Pv = Harbour seal (Phoca vitulina); Hg = Grey seal (Halichoerus grypus).
Capture_site = Capture site (here Baie de Somme, France)
Date_capture = Date the animal was captured
Type_tag = Type of tag fitted on the seal (here GPS/GSM tag)
Tag_number = Tag number
Seal_ID = ID of individual seal captured
Sex = Sex
Body_mass = Body mass (kg)
Total_length = Total length (cm)
Girth = Girth (cm)
Date_last_dive = Date of last dive
Tracking_dur = Tracking duration (days)
N_dives = Number of dives registered
SI_whiskers = If δ13C and δ15N stable isotopes were measured along the longest whisker of the individual (data available on SEANOE https://doi.org/10.17882/76528). 1 = yes; 0 = no.
Comment = Specific comment concerning the data

Data
File Size Format Processing Access
Dive data 118 MB CSV Quality controlled data Open access
Dive metadata 1 KB CSV Quality controlled data Open access
Individual characteristics data 2 KB CSV Quality controlled data Open access
Individual characteristics metadata 754 bytes CSV Quality controlled data Open access
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How to cite 

Planque Yann, Caurant Florence, Vincent Cécile (2021). Dive data obtained from telemetry tracking of ten harbour seals (Phoca vitulina) and twelve grey seals (Halichoerus grypus), captured in the Baie de Somme, France, in 2008 and 2012, and fitted with GPS/GSM tags. SEANOE. https://doi.org/10.17882/80016


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


Planque Yann, Huon Mathilde, Caurant Florence, Pinaud David, Vincent Cécile (2020). Comparing the horizontal and vertical approaches used to identify foraging areas of two diving marine predators. Marine Biology, 167(2), -. https://doi.org/10.1007/s00227-019-3636-8