Biography:

In the past J.L. Watkins has collaborated on articles with S.E. Thorpe. One of their most recent publications is Circumpolar connections between Antarctic krill (Euphausia superba Dana) populations: Investigating the roles of ocean and sea ice transport. Which was published in journal Deep Sea Research Part I: Oceanographic Research Papers.

More information about J.L. Watkins research including statistics on their citations can be found on their Copernicus Academic profile page.

J.L. Watkins's Articles: (2)

Circumpolar connections between Antarctic krill (Euphausia superba Dana) populations: Investigating the roles of ocean and sea ice transport

AbstractAntarctic krill, Euphausia superba Dana, has a heterogeneous circumpolar distribution in the Southern Ocean. Krill have a close association with sea ice which provides access to a critical food source and shelter, particularly in the early life stages. Advective modelling of transport pathways of krill have until now been on regional scales and have not taken explicit account of sea ice. Here we present Lagrangian modelling studies at the circumpolar scale that include interaction with sea ice. The advection scheme uses ocean velocity output from the Ocean Circulation and Climate Advanced Modelling (OCCAM) project model together with satellite-derived sea ice motion vectors to examine the potential roles of the ocean and sea ice in maintaining the observed circumpolar krill distribution. We show that the Antarctic Coastal Current is likely to be important in generating the large-scale distribution and that sea ice motion can substantially modify the ocean transport pathways, enhancing retention or dispersal depending upon location. Within the major krill region of the Scotia Sea, the effect of temporal variability in both the ocean and sea ice velocity fields is examined. Variability in sea ice motion increases variability of influx to South Georgia, at times concentrating the influx into pulses of arrival. This variability has implications for the ecosystem around the island. The inclusion of sea ice motion leads to the identification of source regions for the South Georgia krill populations additional to those identified when only ocean motion is considered. This study indicates that the circumpolar oceanic circulation and interaction with sea ice is important in determining the large-scale distribution of krill and its associated variability.

EditorialThe CCAMLR 2000 Survey: a multinational, multi-ship biological oceanography survey of the Atlantic sector of the Southern Ocean

AbstractThe CCAMLR 2000 Survey is the first large-scale multinational, multi-ship survey in the Southern Ocean since 1979/80. Conducted using strict method protocols and within a 32-day time frame it provides a truly synoptic view of the oceanography, zooplankton, krill, and higher predator biomass and distribution for the Scotia Sea and Antarctic Peninsula region. The innovative design of interleaved transects surveyed only during the hours of daylight has provided a comprehensive and robust estimate of krill biomass.

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