OSMOREGULATION IN DREISSENA-POLYMORPHA - THE IMPORTANCE OF NA, CL, K, AND PARTICULARLY MG

被引:54
作者
DIETZ, TH
LESSARD, D
SILVERMAN, H
LYNN, JW
机构
关键词
D O I
10.2307/1542167
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Zebra mussels (Dreissena polymorpha) are unusual in that they cannot survive in Mg-deficient water. Analysis of blood samples from mussels obtained in the field indicated a Mg concentration of 1.5-2.0 mM immediately after animal collection. However, Mg concentration in the blood decreased rapidly when the mussels were transferred to Mg-free artificial pondwater (PW); the t(1/2) was 24 h. Blood Mg decreased to the limits of detection within 2 weeks, and the time to 50% mortality was about 17 days in Mg-free PW. When Mg-depleted specimens of D. polymorpha were returned to PW containing Mg, the net flux was 3 mu mol Mg (g dry tissue.h)(-1), and blood Mg concentration was restored within a day to 0.4-0.6 mM. Mussels depleted of Mg did not survive beyond 51 days. When mussels were acclimated to K-free pondwater (containing Mg), their osmoregulatory ability was impaired, and the total solute of the blood dropped from 30-36 to 21-24 mosm, with blood Na and Cl concentrations declining 30-50%. This ion-depleted condition was reversed within 45 h upon return of K to the pondwater bathing medium. D. polymorpha individuals were unable to survive beyond 5 days in deionized water and required minimal concentrations of Na, Cl, K, and Mg for prolonged storage (>51 days) under laboratory conditions. Mussels survived Ca-deficient solutions for more than 51 days, presumably because they were able to mobilize Ca from internal stores (shell) to maintain blood calcium at 1 mM.
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页码:76 / 83
页数:8
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