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In this illustration there is a drawing of a baleen whale with the label ‘may eat up to 3600 kg of krill each day’. Underneath this there is a drawing of some krill labelled ‘400 time lifesize relative to whale’. Underneath this there is a drawing of some phytoplankton labelled ‘100 times lifesize relative to krill’. There are arrows pointing from the phytoplankton to the krill and from the krill to the baleen whale. This illustration shows a baleen whale, some krill and some phytoplankton. Arrows point from the phytoplankton to the krill to the baleen whale.

 2 Analysing ecosystems – a summary