If animals were unable to harness the signals coming in from their environs, their lives would be a chaotic affair. In the special conditions that prevail in Antarctic waters, chemical signals represent a particularly important source of information that acts to organize their way of life on the sea floor.

Gdyby zwierzęta nie potrafiły wykorzystywać informacji z otoczenia, ich życie pogrążone byłoby w chaosie. W środowisku wodnym ważnym nośnikiem informacji są sygnały chemiczne. W specyficznych warunkach wód antarktycznych wiodący wpływ na organizację życia na dnie morza odgrywają sygnały pochodzące od pożywienia.

Many Antarctic marine benthic invertebrates are adapted to specific environ− mental conditions (e.g. low stable temperatures, high salinity and oxygen content). Changes caused by global climatic shifts can be expected to have significant impact on their physiol− ogy and distribution. Odontaster validus, an ubiquitous, omnivorous sea star is one of the “keystone species” in the Antarctic benthic communities. Laboratory experiments were car− ried out to study the effect of temperature rise (from 0 to 5°C) on some vital biological func− tions that sea stars must perform in order to survive in their environment. Parameters such as behavioural reaction of sea stars to food and food odour, locomotory performance and abil− ity to right were measured. Temperature increase significantly impaired the ability of O. validus to perform these functions (e.g. lowering the number of sea stars able to right, in− creasing time−to−right, reducing locomotory activity, weakening chemosensory reaction to food and food odour). At temperatures of 4 and 5°C a loss of motor coordination was ob− served, although at all tested temperatures up to 5°C there were single individuals perform− ing successfully.