File(s) under permanent embargo
Network analysis of acoustic tracking data reveals the structure and stability of fish aggregations in the ocean
journal contribution
posted on 2023-05-17, 21:21 authored by Stehfest, K, Patterson, TA, Dagorn, L, Holland, KN, Itano, D, Jayson SemmensJayson SemmensAggregations in the distribution of individuals are an almost universal phenomenon in living organisms. Groups of animals that display collective coordinated movement without forming stable social bonds such as fish schools are a special type of aggregation. In tropical tuna fisheries, aggregating behaviour is directly exploited through the use of artificial fish aggregating devices (FADs). Hence, understanding the dynamics of schooling behaviour and the potential impacts of FADs upon it may have ramifications for tuna management. As a novel way of quantifying spatiotemporal co-occurrences of animals, we applied network statistics to acoustic tracking data to identify the co-occurrences of individual yellowfin tuna, Thunnus albacares, in an array of FADs and determine the frequency and temporal dynamics of these co-occurrences. We observed large interannual variation in movement rates of tuna between FADs, and corresponding interannual variability in the mean number of spatiotemporal associates for each individual as well as the temporal stability of associations. When movement rates were high, associations within FAD aggregations decayed to randomness three times faster than when movement rates were lower. This raises the possibility that if FADs are sufficiently close for fish to perform frequent between- FAD movements, school mixing may be increased and cohesion reduced.
History
Publication title
Animal BehaviourVolume
85Issue
4Pagination
839-848ISSN
0003-3472Department/School
Institute for Marine and Antarctic StudiesPublisher
Academic Press Ltd Elsevier Science LtdPlace of publication
24-28 Oval Rd, London, England, Nw1 7DxRights statement
Copyright 2013 The Association for the Study of Animal BehaviourRepository Status
- Restricted