Sun compass in the orientation ofIdotea baltica(Pallas) (Isopoda, Idoteidae)

Abstract
Various types of releases (in the sea, on wet sand, in a test bowl on a dry substrate and in the water) have confirmed that Idotea baltica rely primarily on sun compass in order to orient in an ecologically efficient direction and, contemporaneously, also on local cues. As idoteids either passively or actively change habitats throughout the year they should be able to adapt their orientation to new locations.