Adamussium colbecki is a scallop endemic of the Antarctic Ocean, the only modern survivor
of the Adamussiini tribe and one of the few bivalves living in polar environments. Compared
with other Antarctic animals, very little is known concerning the evolutionary adaptations which
allow this species to thrive at sub-zero temperatures. Due to its local abundance and sensitivity
to environmental changes, A. colbecki is an interesting model for studying the effects of pollution
and climate change in the Antarctic Ocean. Here, we report, for the first time, the application of
transcriptomic tools to the study of the effects of a short-to-medium term exposure to a +1.5 °C water temperature increase on three tissues. Although this approach did not highlight any significant change in response to thermal stress, we observed slight alterations in energetic metabolism and nutrient adsorption in the digestive gland, most likely linked with stabling in experimental tanks.
The results of our study suggest that A. colbecki may be particularly vulnerable to the effects of climate change due to its complete inability to adapt to temperature increase at the transcriptomic level.
