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GOSarssurvey
Survey transects carried out during the AKES 2008 cruise with the R/V ’GO Sars’. The first leg started in Montevideo (Uruguay) and ended in Cape Town (South Africa), the second started in Cape Town and ended in Walvis Bay (Namibia)  som blei utført under AKES-toktet. The black boxes encircle South Georgia and Bouvetøya, regions submitted to extra research effort.
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Antarctic Krill and Ecosystem Studies (AKES)

The AKES project as a multi-disciplinary research approach, was IMRs first contribution to acquire new knowledge for improved krill management.

Although there has been a considerable international research effort in the Southern Ocean during later years, there are still large gaps in knowledge about the Antarctic marine ecosystem in general and krill as a key ecological and economical species in particular. The main reasons for this are the enormous size of the area and the difficulties of conducting research cruises in these waters due to high costs, complicated logistics and specialized scientific expertise.

With the main basis in a comprehensive research cruise to the Southern Ocean in 2008 as part of the International Polar Year, the project focused on two major tasks: firstly to study acoustic properties of Antarctic krill and mackerel icefish and secondly to investigate krill population demography and trophic relations of the main pelagic communities in the little studied area around the Bouvet Island.

The abundance of krill in the sea is estimated based on hydroacoustics and a prioritized work in AKES was related to acoustic properties of Antarctic krill. Such work is essential in order to make reliable abundance estimates. In AKES, this was studied both from a theoretical point of view and in the field using special equipment including moorings and a submersible probe.

The AKES survey crossed extensive areas both in north-south and east-west directions, and another focus area of the project was distribution, abundance and biological properties of Antarctic krill and krill swarms in relation to the oceanography.

During the AKES survey quite some time was spent in the areas surrounding the Bouvet Island. This area is very little studied and different ecosystem components here including plankton, fish and squid were investigated. In addition, krill distribution and demographical characteristics were described.     

What is an ecosystem?

Ecosystems are often described in terms of energy transfer between levels of the food chain. Behind the energy transfer, however, a life or death struggle between predators and prey is taking place. This struggle, in which every individual tries to make the most of itself by spreading its genes, results in what we call the “interplay of nature”. This interplay is fascinating, both as a field of study and as a management problem.

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