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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. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keywords
    Condition factor; Dissolved oxygen; Environmental factors; Mud; Salinity effects; Sand; Seasonal variations; Substrata; Water temperature; Rangia cuneata (G. B. Sowerby I, 1832) [WoRMS]; Brackish water

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  • Peddicord, R.K.

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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