Volume 48, No. 1

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Seabird and cetacean occurrence in the Bay of Bengal associated with marine productivity and commercial fishing effort


1Department of Ecology and Environmental Sciences, Pondicherry University, Kalapet, Puducherry 605014, India (
2Centre d'Ecologie Fonctionnelle et Evolutive, UMR 5175, CNRS - Université de Montpellier - Université Paul-Valéry Montpellier - EPHE, Montpellier, France
3National Centre for Sustainable Coastal Management (NCSCM), Ministry of Environment, Forest and Climate Change (MOEF & CC), Site office, Bhubaneswar, Odisha 751024, India
4Sigur Nature Trust, Chadapatti, Mavinhalla PO, Nilgiris, Tamil Nadu 643223, India
5FitzPatrick Institute of African Ornithology, NRF-DST Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa. 6National Institute of Polar Research, Midori-cho 10-3, Tachikawa, Tokyo 190-8518, Japan


MONDRETI, R., DAVIDAR, P., RYAN, P.G., THIEBOT, J.B. & GREMILLET, D. 2020. Seabird and cetacean occurrence in the Bay of Bengal associated with marine productivity and commercial fishing effort. Marine Ornithology 48: 91 - 101

Received 29 November 2018, accepted 15 January 2020

Date Published: 2020/04/15
Date Online: 2019/03/30
Key words: at-sea survey, biogeography, cetaceans, conservation, Bay of Bengal, seabirds,upper trophic level predators, overfishing


At-sea observations of seabirds and cetaceans provide essential baseline information about their biogeography and behaviour, facilitating marine spatial planning and management. Much of the world's oceans have been surveyed, yet some regions remain particularly data-poor for seabirds and cetaceans, including the Bay of Bengal. We performed 39 d of vessel-based observations within the Bay of Bengal from 2012 to2014,surveying an overall linear distance of 4722.3 km. We observed 2697 seabirds of 17 species and 1441 cetaceans of at least eight species. Among the seabirds, Sooty Terns Onychoprion fuscatus (n = 2282, 85% of all birds) and Wedge-tailed Shearwaters Ardenna pacifica (n = 327, 12%) predominated, whereas cetacean numbers were dominated by Spinner Dolphins Stenella longirostris (n=772, 54% of all cetaceans) and Indo-Pacific Bottlenose Dolphins Tursiops aduncus (n=533, 37%). Other seabirds and cetaceans accounted for only 4% and 7%, respectively, of all sightings. The abundance and diversity of both groups was low compared to other tropical areas. We propose that low seabird and cetacean abundance results from low productivity due to stratification in the Bay of Bengal, as well as long-lasting disturbance, overexploitation of marine resources, possible impact of longline fisheries, and the near absence of seabird breeding sites.


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