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Association between bluefin tuna schools and oceanic features in the western Mediterranean
Open accessAbstract
We present an analysis of the distribution of bluefin tuna Thunnus thynnus schools spotted during aerial surveys in the Gulf of Lions, in relation to oceanographic features.Bio-optical and thermal properties of the sea surface derived from high-resolution sensors (AVHRR and SeaWiFS) were studied on a daily basis, and an edge-detection technique was applied to detect frontal zones.Geostatistics and point-process analyses were used to evaluate the role of the environment in structuring the spatial pattern of bluefin tuna (BFT).The distribution of schools spotted was strongly nonstationary both in space and time; this is believed to be an effect of the survey design (transect sampling) and the influence of transient oceanographic structures (surface fronts and eddies).The empirical variograms indicated a spatial range of the BFT schools at around 40 km, with substantial daily variability.Ripley's K statistic, as well as autocorrelation plots, revealed that the fish schools were clustered over a wider range of scales (from 10 to 80 km), indicating more spatial structure than would be expected from a random process.Finally, BFT school distributions appeared well determined by the oceanic features, except at very small scales (<10 km), where over-aggregation occurred, and at the largest scales of our study (> 40 km), where over-spreading was detected.Dynamical ecological processes, such as foraging, are likely to induce this complex spatial pattern.Possible reasons for the association of tuna with fronts are presented.
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“spatio-temporally averaged DCHL values might not best determine, by themselves, the distribution of these visual predators, compared with DCHL fronts to which tunas might be attracted (Brill and Lutcavage, 2001;Royer et al., 2004;Sagarminaga and Arrizabalaga, 2014).”
From Global habitat preferences of commercially valuable tuna (2015) · cites this paper as Royer et al., 2004
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Metadata
- Authors
- Royer, F., Fromentin, J., & Gaspar, P.
- Affiliations
- Ifremer (FR)
- Collecte Localisation Satellites (France) (FR)
- Corresponding author
- Royer, F
- ORCID
- Gaspar, P
- Venue
- Marine Ecology Progress Series
- Publisher
- Inter-Research Science Center
- Published
- 2004
- Volume
- 269
- Pages
- 249-263
- ISSN
- 0171-8630 (ISSN-L)
- 1616-1599
- OpenAlex
- W2123356726
- Cited by
- 107
- References
- 45
- Citations by year
- 2026: 3 · 2024: 3 · 2023: 1 · 2022: 1 · 2021: 4 · 2020: 3 · 2019: 9 · 2018: 3 · 2017: 5 · 2016: 7 · 2015: 6 · 2014: 8 · 2013: 9 · 2012: 5
- FWCI
- 5.47
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Marine Ecology Progress Series (publishedVersion)
- Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea) (submittedVersion, other-oa)
- Funders
- University of Dundee
- Institut Français de Recherche pour l'Exploitation de la Mer
- Commonwealth Scientific and Industrial Research Organisation
- Goddard Space Flight Center
- California Sea Grant, University of California, San Diego
- Topics
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Marine and fisheries research
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Ichthyology and Marine Biology
- Physical Sciences › Environmental Science › Ecology › Marine animal studies overview
- Keywords
- bluefin tuna, Thunnus thynnus, spatial aggregation, ocean fronts, eddies, surface fronts, oceanographic features, Gulf of Lion, Western Mediterranean, bio-optical properties, sea surface temperature, point process analysis, spatial autocorrelation, foraging behavior
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