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  • Resistance adaptations  (1)
  • salinity  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of Salinity on the Growth Rate and Survival of Juvenile Littorina saxatilis Gastropods from Habitats with Different Salinity Regimes (2000)
    Springer
    Russian journal of marine biology 26 (2000), S. 427-431 
    Details
    ISSN: 1608-3377
    Keywords: periwinkles ; salinity ; survival ; growth rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of salinity on the growth rate and survival of juvenile Littorina saxatilis gastropods reared in the laboratory from the young of progenic females collected in estuarine, intermediate, and marine habitats were studied. The optimum growth conditions of juveniles were dependent on the salinity regime in their original habitat. The progeny of females from the marine site showed maximum survival at a salinity of 23‰, the value corresponding to the normal salinity in their native habitat during the breeding period, while at 14‰, the growth of juveniles from this population was strongly suppressed. Juveniles originating from the estuarine habitat were able to maintain equally high growth rates at 23 and 14‰; however, at 14‰, they grew significantly faster than juveniles from the marine site. The progeny of females from the intermediate habitat showed intermediate growth rates at 14‰. Fluctuating salinity (23–8–23‰) had an adverse effect on the growth of juvenile Littorina, irrespective of the parental habitat. The differences in survival, size, and growth rates of the progeny of L. saxatilis in habitats with different salinity regimes are discussed in relation to their potential adaptive significance to life in estuaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009498822068
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  • 2
    Electronic Resource
    Electronic Resource
    Resistance to freshwater exposure in White Sea Littorina spp. I: Anaerobic metabolism and energetics (2000)
    Springer
    Journal of comparative physiology 170 (2000), S. 91-103 
    Details
    ISSN: 1432-136X
    Keywords: Key words Salinity stress ; Resistance adaptations ; Anaerobic metabolism ; ATP turnover ; Littorina spp.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  Anaerobic metabolism and changes in the osmotic concentration of extravisceral fluid were studied in the White Sea periwinkles (Littorina littorea, Littorina saxatilis and Littorina obtusata) during freshwater exposure. Resistance to hypoosmotic stress increased in the order: L. obtusata 〈 L. saxatilis 〈 L. littorea. Our data suggest that osmotic shock is not a primary reason for mortality of the periwinkles under these conditions. During environmental anaerobiosis, considerable succinate accumulation (up to 10–19 μmol g−1 wet weight), and depletion of phosphagen and ATP pools were found in the studied species. Other metabolic end products (alanopine, strombine, lactate, acetate or propionate) were not detected. Succinate accumulation and net ATP breakdown were the fastest in the least resistant species, L. obtusata, and slowest in the most resistant, L. littorea. Rate of ATP turnover decreased during freshwater exposure in L. littorea and L. saxatilis, but not in L. obtusata. Our data suggest that differential resistance of three studied Littorina spp. to extreme hypoosmotic stress may be related to their different abilities to reduce metabolic rate and ATP turnover during sustained anoxia. Species-specific variations in anaerobic capacity of Littorina spp. are discussed in relation to their vertical distribution, size and ecology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003600050264
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    Paper (German National Licenses)
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