scholarly journals On Marine Eocene, fresh-water Miocene, and other fossil Mollusca of western North America

10.3133/b18 ◽  
1885 ◽  
Keyword(s):  
North America ◽  
Fresh Water ◽  
Western North America

SUCCESSFUL REARING OF CENOCORIXA EXPLETA (HEMIPTERA: CORIXIDAE) IN FRESH WATER

1978 ◽  
Vol 110 (5) ◽  
pp. 559-559 ◽  
Author(s):  
S.G. Cannings
Keyword(s):  
North America ◽  
Fresh Water ◽  
Salinity Tolerance ◽  
Field Survey ◽  
Western North America

The water boatman Cenocorixa expleta (Uhler) is an inhabitant of saline ponds in the interior of western North America (Jansson 1972; Scudder 1976). In a field survey, Scudder (1969a) failed to find this species in ponds with surface conductivities less than 3900 μmhos/cm. Although it is apparently absent from fresh water, the osmotic responses of C. expleta are essentially those of a fresh water insect (Scudder et al. 1972). Also, salinity tolerance experiments carried out by Scudder (1969b) show that at 15°C adults of the species can survive almost a month in fresh water (less than 800 μmhos/cm) without food. However, it has not been shown that C. expleta can actually develop and breed successfully in fresh water.

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