Grey seals (Halichoerus grypus) at Sable Island (data from Baker et al. 2015)

Lidgard DC, Bowen WD, Iverson SJ. 2015. Grey seals (Halichoerus grypus) at Sable Island (data from Baker et al. 2015). Movebank Data Repository.
Background: Paired with satellite location telemetry, animal-borne instruments can collect spatiotemporal data describing the animal’s movement and environment at a scale relevant to its behavior. Ecologists have developed methods for identifying the area(s) used by an animal (e.g., home range) and those used most intensely (utilization distribution) based on location data. However, few have extended these models beyond their traditional roles as descriptive 2D summaries of point data. Here we demonstrate how the home range method, T-LoCoH, can be expanded to quantify collective sampling coverage by multiple instrumented animals using grey seals (Halichoerus grypus) equipped with GPS tags and acoustic transceivers on the Scotian Shelf (Atlantic Canada) as a case study. At the individual level, we illustrate how time and space-use metrics quantifying individual sampling coverage may be used to determine the rate of acoustic transmissions received. Results: Grey seals collectively sampled an area of 11,308 km 2 and intensely sampled an area of 31 km 2 from June-December. The largest area sampled was in July (2094.56 km 2 ) and the smallest area sampled occurred in August (1259.80 km 2 ), with changes in sampling coverage observed through time. Conclusions: T-LoCoH provides an effective means to quantify changes in collective sampling effort by multiple instrumented animals and to compare these changes across time. We also illustrate how time and space-use metrics of individual instrumented seal movement calculated using T-LoCoH can be used to account for differences in the amount of time a bioprobe (biological sampling platform) spends in an area.
animal movement,animal tracking,bio-logging,bioprobe,grey seals,Halichoerus grypus,marine acoustics,ships of opportunity
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DOIs of related Publications
  title = {Grey seals (Halichoerus grypus) at Sable Island (data from Baker et al. 2015)},
  author = {Lidgard, DC and Bowen, WD and Iverson, SJ},
  year = {2015},
  URL = {},
  doi = {doi:10.5441/001/1.910p0c20/2},
  publisher = {Movebank data repository}
ID  - doi:10.5441/001/1.910p0c20/2
T1  - Grey seals (Halichoerus grypus) at Sable Island (data from Baker et al. 2015)
AU  - Lidgard, Damian C.
AU  - Bowen, W. Don
AU  - Iverson, Sara J.
Y1  - 2015/09/15
KW  - animal movement
KW  - animal tracking
KW  - bio-logging
KW  - bioprobe
KW  - grey seals
KW  - Halichoerus grypus
KW  - marine acoustics
KW  - ships of opportunity
KW  - Halichoerus grypus
PB  - Movebank data repository
UR  -
DO  - doi:10.5441/001/1.910p0c20/2
ER  -