Avtor/Urednik		Toman, Mihael J; Dall, Peter C
Naslov		Respiratory levels and adaptations in four freshwater species of Gammarus (Crustacea: Amphipoda)
Tip		članek
Vir		Int Rev Ges Hydrobio
Vol. in št.		Letnik 83, št. 3
Leto izdaje		1998
Obseg		str. 251-63
Jezik		eng
Abstrakt		Respiration of four freshwater species of the amphipod crustacean Gammarus: G. fossarum, G. lacustris (river and lake), G. pulex and G. roeseli were measured in a closed, stirred respirometric chamber with a micro-electrode. Oxygen consumption, expressed as weight-specific oxygen uptake (Rs) in relation to decreasing oxygen concentration, varied at air saturation from 0,86 (G. lacustris, lake) to 2.06 microO2 mg-1 AFDW h-1 (G. pulex). Rs also differed intra-specifically among the two populations of G. lacustris. G. lacustris (river), G. pulex and G. roeseli expressed moderate ability to regulate their oxygen consumption at decreasing oxygen concentrations, whereas the regulation ability was higher in G. lacustris (lake) and in G. fossarum, which maintain high oxygen uptake at oxygen levels > 2 mg O2 l-1. All four Gammarus species are partial regulators in response to variations in oxygen concentration. The differences between species are considered too small to account for their natural distributions. It appears that the tolerances of Gammarus species to organic pollution depend only in part on oxygen conditions.
Deskriptorji		CRUSTACEA OXYGEN CONSUMPTION FRESH WATER BODY WEIGHT BIOMASS