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Sex ratio and distribution within a large population of the fiddler crab Uca capricornis

Created 25/06/2017

Updated 11/08/2023

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The purpose of this experiment was to determine whether females may be a limited resource within a population of Uca capricornis. The experiment was part of a larger study looking at the relationship between neighbouring males and females in this species. Experiments were conducted in the East Point Reserve, Darwin. Fieldwork was conducted yearly in 18 plots (4mx4m) from November-January in 2002-2006.

All individuals within the plots were caught and carapace widths measured. This allowed the sex ratio in relation to size to be determined. The location of burrows were also recorded to determine whether the males and females were distributed independently of each other. The distance to, and sex of, the nearest resident for each individual was also measured to compare mean distances between male-female neighbours and between male-male neighbours.

Results indicate that an average of 7 crabs per square metre were active on the surface at any time. The sex ratio was strongly male biased, with only 30% of crabs being female. The sex ratio also changed with size; females were significantly rarer in large size classes.

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Field Value
Title Sex ratio and distribution within a large population of the fiddler crab Uca capricornis
Language English
Licence Creative Commons Attribution 2.5 Australia
Landing Page https://data.gov.au/data/en/dataset/0aeae1e7-96d4-4047-b6d8-2ce5169dcda0
Contact Point
Australian National University
Tanya.Detto@hotmail.com
Reference Period 25/06/2017
Geospatial Coverage
Map data © OpenStreetMap contributors
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  "type": "Polygon"
}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "Sex ratio and distribution within a large population of the fiddler crab Uca capricornis". Please visit the source to access the original metadata of the dataset:
https://data.gov.au/data/dataset/sex-ratio-and-distribution-within-a-large-population-of-the-fiddler-crab-uca-capricornis