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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: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793
Peer reviewed article  
Beschikbaar in  Auteur 
Trefwoorden
    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]
    Brak water
Auteur  Top 
  • 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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