. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 222 C. L. THURMAN II IOO- 80- lil o 60- 40- 20 sub n. (XJ + 4 8 12 CARAPACE LENGTH (mm) FIGURE 5. Percent males (Pm) U. subcylindrica in each mm carapace length size interval. Linear regression computed by least squares method. Mean Pm for each subpopulation indicated. Previously, Crane (1975) regarded the Red Sea as the most saline body of water in- habited by fiddler crabs. She reported the presences of three widely distributed Indo- Pacific species in habitats with salinities typically between 3
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 222 C. L. THURMAN II IOO- 80- lil o 60- 40- 20 sub n. (XJ + 4 8 12 CARAPACE LENGTH (mm) FIGURE 5. Percent males (Pm) U. subcylindrica in each mm carapace length size interval. Linear regression computed by least squares method. Mean Pm for each subpopulation indicated. Previously, Crane (1975) regarded the Red Sea as the most saline body of water in- habited by fiddler crabs. She reported the presences of three widely distributed Indo- Pacific species in habitats with salinities typically between 37 and 40%o. The Celuca appear to be the most successful of all subgenera in adapting to terrestrial habitats. From this terrestrial vantage point, Uca subcylindrica are unique among the fiddler crabs. Their limited geographic range is coincident with isolated lagoons in semi-arid south Texas and northeastern Mexico with salinities occasionally over 100%» (Thur- man, 1984). This species occupies very deep burrows near ephemeral bodies of water characterized by wide fluctuations in salinity up to 70%o (cf, Hedgpeth, 1953). A con- tinued survival of the species in this harsh habitat requires special modifications in reproduction. The reproductive biology of Uca subcylindrica contains anomalous fea- tures when compared to other species of fiddler crabs. Adaptations in egg production and larval development are ultimately reflected in the population structure of the species. Early development The terrestrial ecology of U. burgersi has been documented by von Hagen (1970b) and Gibbs (1974). This species is commonly found in habitats with salinities between and , possesses extraordinary osmoregulatory abilities (Schmidt-Neilsen el al., 1968), and has large eggs ( mm dia.). The low ratio of ovigerous females observed in the present population sample () is similar to the 6 females found by Gibbs (1974) in a sample of 535 Uca burgersi Holthuis. This statistic was estima
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
