title: Sub-littoral and supra-littoral amphipods respond differently to acute thermal stress.
abstract: Thermal tolerance was determined in two closely related amphipod species from contrasting environments (sub-littoral and supra-littoral zones of the sea) using HSP expression and the activity of antioxidant enzymes. The levels of HSP70 and small HSPs present in untreated control animals were higher in the supra-littoral Orchestia gammarellus than in the sub-littoral Gammarus oceanicus. Under the acute thermal stress, HSP levels increased less strongly in O. gammarellus than in G. oceanicus. Activities of antioxidant enzymes peroxidase, catalase and glutathione S-transferase, were more pronounced in the supra-littoral O. gammarellus then in the sub-littoral G. oceanicus. We conclude that the environmental temperature regime modifies key cellular defense mechanisms in amphipods. Higher levels of constitutive HSP synthesis and higher levels of antioxidant enzymes in the supra-littoral species likely reflects adaptation to this highly thermally variable environment.
authors.affiliation: Irkutsk State University, Irkutsk, Russia. daria.bedulina@gmail.com
authors.forename: D S
authors.initials: DS
authors.lastname: Bedulina
authors.forename: M
authors.initials: M
authors.lastname: Zimmer
authors.forename: M A
authors.initials: MA
authors.lastname: Timofeyev
mesh_terms: D033304:Amphipoda / Q000201:enzymology / Q000502:physiology*; D000818:Animals; D002374:Catalase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D013312:Stress, Physiological; D013696:Temperature
chemical_list: D018840:HSP70 Heat-Shock Proteins; D002374:Catalase; D009195:Peroxidase; D005982:Glutathione Transferase