Population structure and morphometric variation in the sand-bubbler crab Scopimera crabricauda (Brachyura: Dotillidae)

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In the present study, population ecology and relationships between various morphometric characters of the sand-bubbler crab Scopimera crabricauda from the Persian Gulf (Iran) were studied. Crabs were collected monthly by excavating nine quadrats in high-density areas of open burrows at low, mid and high intertidal levels during spring low tides for one year. A total of 534 crabs was collected, of which 70% were males (and 30% females). Mean carapace width and total weight in both sexes showed significant differences. Crabs with a carapace width ranging from 5 to 7 mm were the dominant crabs in the population. The highest numbers of crabs were found in the higher intertidal area. The mean size of crabs decreased towards the sea. The aggregation of small crabs was found towards sea in female crabs. Juveniles were abundantly found from January to March whereas the sub-adults and adults were mostly found from April to January. The carapace length to carapace width relationship differed between males and females, as did the carapace width and carapace length to total weight relationships. Finally, the relationship between carapace width and weight for both sexes showed that the growth of this species is allometric.

Population structure and morphometric variation in the sand-bubbler crab Scopimera crabricauda (Brachyura: Dotillidae)

in Animal Biology

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References

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Figures

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    Sampling locations at southern Golshahr, Bandar Abbas, Iran, on the Persian Gulf for the species Scopimera crabricauda Alcook, 1900 from January 2016 to January 2017.

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    (A) Mean size of carapace width (CW) and carapace length (CL) with standard error for both sexes. (B) Mean total weight (TW) with standard error for both sexes.

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    Number of individuals of S. crabricauda collected from January 2016 to January 2017.

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    Collected number of males (A) and females.

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    Number of males (A) and females collected at three intertidal levels.

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    Length to width relationship in male (A) and female (B) crabs.

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    (A) Carapace width to total weight relationship and (B) Carapace length to total weight relationship in male crabs.

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    (A) Carapace width to total weight relationship and (B) Carapace length to total weight relationship in female crabs.

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