ISSN:
1432-136X
Keywords:
Sodium regulation
;
Adaptive change
;
Freshwater crustacean
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary Sodium efflux in three populations of the freshwater amphipod Corophium curvispinum were measured seasonally over a 6-year period and compared to rates recorded in 1980. While continuing to show relatively high Na+ loss rates, compared to other freshwater amphipod species, sodium permeability (PNa) has decreased significantly in the medium term (post 1983). PNa also shows seasonal fluctuations in all populations. Changes in body sodium content (BNa) and blood [Na+] were found during this period and some alteration of the kinetic characteristics, K m and V max, of the sodium uptake system has occurred. Acclimation to different [Na+] media, and to low and high temperatures produced significant changes in Na+ efflux. The importance of acclimation (acclimatization) and selection in reducing passive Na+ loss and effecting changes in Na+ regulation of this colonizing species are assessed in relation to environmental changes.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00258766
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