Dear marmam list subscribers,

Drs. Victoria Todd & Laura Williamson at Ocean Science Consulting are pleased to announce publication of our latest paper: Todd, V.L.G., and Williamson, L.D. (2021): Cetacean distribution in relation to oceanographic features at the Kerguelen Plateau. Polar Biology. https://doi.org/10.1007/s00300-021-02977-3

Abstract

The Kerguelen Plateau in the south-eastern Indian Ocean is one of the most isolated and understudied regions on earth. As

part of the Kerguelen Plateau Drifts project, Marine Mammal Observer (MMO) data were collected during a seismic survey

in the austral summer (January–February 2020). Relationships between observation effort, cetacean sightings, seismic operations,

and oceanographic variables—including bathymetry (depth and slope), nutrient concentrations, and indices of primary

productivity—were investigated using Generalized Additive Models (GAMs). In total, 354 h and 45 min of observation effort

resulted in 191 cetaceans (178 adults and at least 13 juveniles) of nine species observed on 48 occasions, over 14 days along

the transect line. Marine mammal sightings occurred in water depths of 624–4699 m, with a hotspot of sightings recorded

along the northern flank of the Kerguelen Plateau, in proximity to shelf edges. There was one sighting of a mixed pod of

Kerguelen Commerson’s dolphins (Cephalorhynchus commersonii kerguelenensis) and dusky dolphins (Lagenorhynchus

obscurus), which to the best of our knowledge, is the first confirmed sighting of dusky dolphins in the Kerguelen Islands. Of

the nine cetacean species observed, no niche separation was apparent, and all species were observed throughout the survey

area. Dissolved oxygen and chlorophyll-a were the most significant predictors of cetacean occurrence. Systematic MMO data

combined with synoptic satellite-derived/empirical oceanographic metadata have great potential to facilitate understanding

of behaviour, geographical range, and population-status monitoring of cetaceans. This is especially important for cetacean

stock assessment and minimising potential acoustic disturbance in Antarctic ecosystems.

Kind regards,

--

Dr. Victoria Todd

Managing Director

Ocean Science Consulting Limited (OSC)

Spott Road, Dunbar, East Lothian, EH42 1RR, Scotland, UK

T: +44 (0)1368 865 722

W: www.osc.co.uk

Check out my latest papers on:

Cetaceans & oceanography: https://doi.org/10.1007/s00300-021-02977-3

Ecosystem modelling: https://doi.org/10.1016/j.envsoft.2021.105098

Acoustic Deterrent Devices: https://doi.org/10.1016/j.marpolbul.2021.112171

ROVs: https://doi.org/10.1093/icesjms/fsaa245

Underwater-noise: https://asa.scitation.org/doi/abs/10.1121/10.0002958

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