Preliminary analysis (2 cages, 24 clams/cage) showed that the ranking of sites in terms of clam...
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Preliminary analysis (2 cages, 24 clams/cage) showed that the ranking of sites in terms of clam growth over 5 wks in 2013 was: Tuckerton > HC = Sedge >
Preliminary analysis (2 cages, 24 clams/cage) showed that the
ranking of sites in terms of clam growth over 5 wks in 2013 was:
Tuckerton > HC = Sedge > IBSP. Low growth at IBSP in 2013 is
attributed to low salinities during early-mid June (minimum = 16,
Table 1) approaching the low tolerance limit for hard clams [1].
Clams ceased growing during this period, which coincided with high
precipitation (cumulative levels of ~10, compared to 5 in 2012).
Harvey Cedars (HC) Sedge Is. (Marine Conservation Zone) Island
Beach State Park (IBSP) Tuckerton Cove Little Egg Inlet Barnegat
Inlet The optimum temperature range for hard clam growth is ~20 o
to 24 o C, with growth rates declining above and below this range
[1]. Despite consistently lower temperatures and markedly greater
temperature variation at Sedge (up to 16 o C day -1 ) than at other
sites ( Tuckerton > IBSP > HC ). Fig. 3: Contribution of
Phytoplankton FTGs to Chl a and Clam Soft Tissue Growth Rates-
Deployment II 2012 Background Fig. 5: Mean Shell Growth Rates
Deployment I 2013 Fig 2: Water Temperatures (daily means) during
Deployment I Toms River [1] Grizzle R., V.M. Bricelj, S.E. Shumway.
2001, Physiological ecology of Mercenaria mercenaria, Chapter 8 In:
Kraeuter, J. & M. Castagna (eds.). Biology of the Hard Clam.
Amsterdam: Elsevier, New York, pp. 305-382. [2] Paerl, H. W., L. M.
Valdes, J. L. Pinckney, M. F. Piehler, J. Dyble, P. H. Moisander.
2003. Phytoplankton photopigments as indicators of estuarine and
coastal eutrophication. BioScience 53.10: 953 [3] Mahoney and Olsen
2001, Phytoplankton in the Barnegat Bay-Little Egg Harbor system:
Species composition and picoplankton bloom development. Journal of
Coastal Research 32: 115-143 LE H Fig. 4: Relationship between
Picoplankton & Clam Growth (IBSP)