. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SHRIMP ABUNDANCE AND DISTRIBUTION 183 1000 -r; 0-100 - - I 4- 0001 Cranyon franciscorum. 10 20 30 40 Total Length (mm) 50 60 70 80 90 100 FIGURE 5. Relationship between total length (mm) and dry weight (g) of juvenile (solid circles), male (open circles), female (triangle) specimens of Crane/on fraiiciscoruin collected from the study area, January, 1976-October, 1978. 50c/f of the mature females collected during these periods were ovigerous. Ovig- erous females ranged in size from 23 to 48 mm long. Female specimens of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SHRIMP ABUNDANCE AND DISTRIBUTION 183 1000 -r; 0-100 - - I 4- 0001 Cranyon franciscorum. 10 20 30 40 Total Length (mm) 50 60 70 80 90 100 FIGURE 5. Relationship between total length (mm) and dry weight (g) of juvenile (solid circles), male (open circles), female (triangle) specimens of Crane/on fraiiciscoruin collected from the study area, January, 1976-October, 1978. 50c/f of the mature females collected during these periods were ovigerous. Ovig- erous females ranged in size from 23 to 48 mm long. Female specimens of P. macrodactylus appear capable of producing more than one brood; ovigerous females often carried a second brood in the ovaries while the first brood had not yet been released. The brood sizes of 17 specimens of C. franciscorum, ranging in size from 48 to 67 mm long, and 66 specimens of P. macrodactylus ranging in size from 23 to 48 mm long, are presented in Figure 7. The relationships between brood size and body length are given by: C. franciscorum: log N = — + log L. r := ; P. macrodactylus: log N= + log L, r — The size ranges of ovigerous females of the two species have little overlap, but in the area of overlap, P. macrodactylus has a greater mean brood size than C. franciscorum. The seasonal abundance of C. franciscorum and P. macrodactylns in various parts of the study area is shown in Figures 8 and 9. There are obvious differences between 1977 and 1978 in the location of the peak population densities. In 1977. a very dry year, salinity incursion was more extensive than in 1978, and the peak- densities of both C. franciscorum and P. macrodactylus were located in the river channels. In 1978 the bulk of both populations was centered in Suisun Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly res
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
