Animal-borne acoustic transceivers reveal patterns of at-sea associations in an upper-trophic level predator
Satellite telemetry data have substantially increased our understanding of habitat use and foraging behaviour of upper-trophic marine predators, but fall short of providing an understanding of their social behaviour. We sought to determine whether novel acoustic and archival GPS data could be used t...
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| Veröffentlicht in: | PloS one 2012-11, Vol.7 (11), p.e48962 |
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| description | Satellite telemetry data have substantially increased our understanding of habitat use and foraging behaviour of upper-trophic marine predators, but fall short of providing an understanding of their social behaviour. We sought to determine whether novel acoustic and archival GPS data could be used to examine at-sea associations among grey seals (Halichoerus grypus) during the fall foraging period. Fifteen grey seals from Sable Island, Canada were deployed with Vemco Mobile Transceivers and Satellite-GPS transmitters in October 2009, 13 of which were recaptured and units retrieved 79 ± 2.3 days later during the following breeding season, December 2009-January 2010. An association between two individuals was defined as a cluster of acoustic detections where the time between detections was |
| doi_str_mv | 10.1371/journal.pone.0048962 |
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We sought to determine whether novel acoustic and archival GPS data could be used to examine at-sea associations among grey seals (Halichoerus grypus) during the fall foraging period. Fifteen grey seals from Sable Island, Canada were deployed with Vemco Mobile Transceivers and Satellite-GPS transmitters in October 2009, 13 of which were recaptured and units retrieved 79 ± 2.3 days later during the following breeding season, December 2009-January 2010. An association between two individuals was defined as a cluster of acoustic detections where the time between detections was <30 min. Bathymetry, travel rate, and behavioural state (slow and fast movement) were determined for each GPS archival point (3.7 ± 0.1 locations recorded per hour). Behavioural state was estimated using a hidden Markov model. All seals had been involved in associations with other instrumented seals while at sea, with a total of 1,872 acoustic detections recorded in 201 associations. The median number of detections per association was 3 (range: 1-151) and the median duration of an association was 0.17 h (range: <0.1-11.3 h). Linear mixed-effects models showed that associations occurred when seals were exhibiting slow movement (0.24 ± 0.01 ms(-1)) on shallow (53.4 ± 3.7 m) offshore banks where dominant prey is known to occur. 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We sought to determine whether novel acoustic and archival GPS data could be used to examine at-sea associations among grey seals (Halichoerus grypus) during the fall foraging period. Fifteen grey seals from Sable Island, Canada were deployed with Vemco Mobile Transceivers and Satellite-GPS transmitters in October 2009, 13 of which were recaptured and units retrieved 79 ± 2.3 days later during the following breeding season, December 2009-January 2010. An association between two individuals was defined as a cluster of acoustic detections where the time between detections was <30 min. Bathymetry, travel rate, and behavioural state (slow and fast movement) were determined for each GPS archival point (3.7 ± 0.1 locations recorded per hour). Behavioural state was estimated using a hidden Markov model. All seals had been involved in associations with other instrumented seals while at sea, with a total of 1,872 acoustic detections recorded in 201 associations. 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We sought to determine whether novel acoustic and archival GPS data could be used to examine at-sea associations among grey seals (Halichoerus grypus) during the fall foraging period. Fifteen grey seals from Sable Island, Canada were deployed with Vemco Mobile Transceivers and Satellite-GPS transmitters in October 2009, 13 of which were recaptured and units retrieved 79 ± 2.3 days later during the following breeding season, December 2009-January 2010. An association between two individuals was defined as a cluster of acoustic detections where the time between detections was <30 min. Bathymetry, travel rate, and behavioural state (slow and fast movement) were determined for each GPS archival point (3.7 ± 0.1 locations recorded per hour). Behavioural state was estimated using a hidden Markov model. All seals had been involved in associations with other instrumented seals while at sea, with a total of 1,872 acoustic detections recorded in 201 associations. The median number of detections per association was 3 (range: 1-151) and the median duration of an association was 0.17 h (range: <0.1-11.3 h). Linear mixed-effects models showed that associations occurred when seals were exhibiting slow movement (0.24 ± 0.01 ms(-1)) on shallow (53.4 ± 3.7 m) offshore banks where dominant prey is known to occur. These results suggest the occurrence of short-term associations among multiple individuals at foraging grounds and provide new insights into the foraging ecology of this upper-trophic marine predator.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23155435</pmid><doi>10.1371/journal.pone.0048962</doi><tpages>e48962</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Acoustics Animal behavior Animals Bathymetry Behavior, Animal - physiology Biology Breeding Breeding seasons Ecology Ecosystem Feeding Behavior - physiology Fisheries Foraging behavior Foraging habitats Foreign banks Gender differences Global positioning systems GPS Grey seals Habitat utilization Halichoerus grypus Laboratory animals Marine mammals Markov chains Markov processes Oceans and Seas Predators Prey Satellite navigation systems Seals Seals, Earless - physiology Social Behavior Studies Telemetry Transceivers Transmitters Trophic levels |
| title | Animal-borne acoustic transceivers reveal patterns of at-sea associations in an upper-trophic level predator |
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