Abstract
A population of Palaemonetes pugio Holthuis 1949, inhabiting a fairly constant high salinity estuarine environment (North Inlet), exhibited more rapid growth, earlier first reproduction, a smaller clutch size, more fluctuating sex ratio, and shorter life span. A population in a less saline environment (Minim Creek) showed relatively slower growth, delayed first reproduction, larger clutch size, female-dominated sex ratio, and longer life span. Growth in both areas was rapid in summer and slower in winter, with the females growing much larger than the males. Summer generation females first reproduced at the age of 3.5 months in North Inlet and at 4.8 months in Minim Creek. Minim Creek females larger than 30-mm TL carried more eggs than North Inlet females of similar sizes. Life span in North Inlet was calculated to be 6–7 months for the summer generation and 9–10 months for the winter generation; in Minim Creek, the corresponding longevity estimates were 9–10 months and 12–13 months, respectively. Variations in life history patterns are hypothesized to be the results of numerous environmental factors acting differentially on the various life-stages of the organism. The results suggest that the reproductive flexibility of P. pugio enhances its ability to persist in a variety of environments.
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Communicated by J. M. Lawrence, Tampa
Contribution no. 426 of the Belle W. Baruch Institute for Marine Biology and Coastal Research
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Alon, N.C., Stancyk, N.E. Variation in life-history patterns of the grass shrimp Palaemonetes pugio in two South Carolina estuarine systems. Mar. Biol. 68, 265–276 (1982). https://doi.org/10.1007/BF00409593
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DOI: https://doi.org/10.1007/BF00409593