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Different preference reactions of three Lake Baikal endemic amphipods to temperature and oxygen are correlated with symbiotic life

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Thermopreference reactions and avoidance sensitivity to dissolved oxygen levels were measured in three endemic amphipod species from Lake Baikal: Eulimnogammarus verrucosus and E. vittatus, as well as Brandtia parasitica, which is a symbiont of the Baikalean sponge, Lubomirskia baikalensis. The benthic E. vittatus and E. verrucosus demonstrated highly developed thermopreference reactions, whereas B. parasitica did not show thermopreference behaviour. The experimental results also showed that E. vittatus and E. verrucosus avoid water with decreased dissolved oxygen levels, whereas behavioural reactions of B. parasitica did not depend on oxygen concentration. In the presence of sponge fragments, individual B. parasitica moved actively towards them, and concentrated on those fragments. Possible reasons for reduction of behavioural preference in B. parasitica are discussed with a focus on the species' symbiotic status. Les réactions de préférences à la température et la sensibilité d'évitement par rapport aux niveaux d'oxygène dissous ont été mesurées chez trois espèces d'amphipodes endémiques du lac Baïkal: Eulimnogammarus verrucosus et E. vittatus, ainsi que Brandtia parasitica, qui est un symbiote de l'éponge endémique Lubomirskia baikalensis. Les espèces benthiques E. vittatus et E. verrucosus ont démontré des réactions de préférences à la température hautement développées, tandis que B. parasitica n'en montrait pas. Les résultats expérimentaux ont aussi montré que E. vittatus et E. verrucosus évitaient l'eau ayant des niveaux bas d'oxygène dissous, tandis que les réactions comportementales de B. parasitica ne dépendaient pas de la concentration en oxygène. En présence de fragments d'éponge, les individus de B. parasitica se déplaçaient activement vers eux, et se concentraient sur ces fragments. Les possibles raisons de la réduction des préférences comportementales chez B. parasitica sont discutées avec une attention particulière au statut symbiotique de l'espèce.

Affiliations: 1: Institute of Biology, Irkutsk State University, str. Karla Marksa, 1, 664003 Irkutsk, Russia; Baikalean Research Centre, str. Karla Marksa, 5-10, 664003 Irkutsk, Russia


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