| one publication added to basket [195527] | Salinity and substratum effects on condition index of the bivalve Rangia cuneata
Peddicord, R.K. (1977). Salinity and substratum effects on condition index of the bivalve Rangia cuneata. Mar. Biol. (Berl.) 39(4): 351-360
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, more
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| Keywords |
Chemical elements > Nonmetals > Atmospheric gases > Oxygen > Dissolved gases > Dissolved oxygen
Environmental effects > Salinity effects
Environmental factors
Population factors > Condition factor
Properties > Water properties > Temperature > Water temperature
Sediments > Clastics > Mud
Sediments > Clastics > Sand
Substrata
Temporal variations > Periodic variations > Seasonal variations
Rangia cuneata (G. B. Sowerby I, 1832) [WoRMS]
Brackish water |
| Abstract |
The condition index (CI) of R. cuneata was measured monthly at 8 stations in 2 substrate types and 3 salinity regimes in the James River estuary, Virginia, USA. CI was higher in clams from sand bottoms than from mud, and decreased in both substrata in fresher water. Values were lowest in early spring and at a maximum in early autumn, with a pronounced autumn peak in the sand substratum. This pattern coincided with the annual salinity cycle. A field experiment showed that some factor associate with the water overlying a sand or mud substratum, rather than the nature of the substratum itself, was important in determining CI. The hypothesis is presented that this factor may be the higher suspended solids concns measured immediately over mud bottom |
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