. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 302 ROGER I. E. NEWELL ET AL. RESULTS Long Island populations The energy content of the seston at Stony Brook, expressed as joules per liter was consistently greater during the summer (May to October) than at Shinnecock (Fig. 2). During the remainder of the year there were sharp fluctuations in the energy content of the seston at both localities. The mean salinity at Stony Brook was ± () and the temper- ature range was °C to °C (Fig. 3). Mean salinity ( ± ) was higher at Shinnecock, althou
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 302 ROGER I. E. NEWELL ET AL. RESULTS Long Island populations The energy content of the seston at Stony Brook, expressed as joules per liter was consistently greater during the summer (May to October) than at Shinnecock (Fig. 2). During the remainder of the year there were sharp fluctuations in the energy content of the seston at both localities. The mean salinity at Stony Brook was ± () and the temper- ature range was °C to °C (Fig. 3). Mean salinity ( ± ) was higher at Shinnecock, although the temperature range (Fig. 3) was very similar (°C to °C) to that of Stony Brook. There is little tidal, and low annual, variation in salinity at these two localities ( Newell, unpublished data), be- cause neither area is associated with a river drainage system; most precipitation leaves Long Island by percolation through the sandy soil. The reproductive condition (GVF) of male and female mussels from each pop- ulation was analyzed separately to determine synchrony of their cycles. The mean GVF of each sex was compared using a Wilcoxon signed ranks test (Sokal and Rohlf, 1969) for all samples taken during a maturation phase (from the minima to maxima GVF) of the gametogenic cycles for each population; this tests the hypothesis that the same sexes mature at different rates within a population. In general, males had a higher GVF than did females during maturation; the difference was significant for the Shinnecock population (P ). Similar observations on the relative rates of reproductive maturation between sexes in the bivalves have been made for M. edulis (Seed, 1976) and Cardium edule (Newell and Bayne, 1980). To facilitate comparisons of the average reproductive cycle of mussels from both populations, all male and female GVF valves were combined into a mean with 95% confidence limits for each sampling period (Fig. 4). Inspection of Figure 4 reveals t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
