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The osmoregulatory ability in three species of the genus Idotea (Isopoda, Crustacea)
Hørlyck, V. (1973). The osmoregulatory ability in three species of the genus Idotea (Isopoda, Crustacea). Ophelia 12(1-2): 129-140
In: Ophelia: International Journal of Marine Biology. Ophelia Publications: Helsingør. ISSN 0078-5326
Peer reviewed article  
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Trefwoorden
    Crustacea [WoRMS]; Idotea Fabricius, 1798 [WoRMS]; Isopoda [WoRMS]
    Brak water
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  • Hørlyck, V.
Abstract
    The osmoregulation of I. baltica, I. viridis and I. granulosa from Denmark was investigated in an attempt to elucidate their ecological distribution. All were able to keep their haemolymph hyperosmotic relative to the medium in salinities below 30 ppt. Above this conc they were isosmotic. The lower salinity limits tolerated varied, as it was 5, 7 and 9 ppt for respectively I. viridis, I. baltica and I. granulosa. I. viridis was a significantly better osmoregulator than the 2 other species. When transferred from high to low salinity water the haemolymph conc dropped rapidly in all species within the 1st three hrs. After 24 hr an almost steady-state condition was reached. When exposed to a sudden raise in salinity all regulated to the new steady-state situation within 3 hr. The physiological data found in these experiments fit in with the known ecological distribution of the 3 spp.
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