Ecology and Behavior of Gecarcoidea natalis, the Christmas Island Red Crab, During the Annual Breeding Migration

@article{Adamczewska2001EcologyAB,
  title={Ecology and Behavior of Gecarcoidea natalis, the Christmas Island Red Crab, During the Annual Breeding Migration},
  author={Agnieszka M. Adamczewska and Stephen Morris},
  journal={The Biological Bulletin},
  year={2001},
  volume={200},
  pages={305 - 320}
}
The terrestrial crab Gecarcoidea natalis is endemic to the forests of Christmas Island but must migrate each year to the coast to breed. During 1993 and 1995, radio-tracking, mark and recapture, and counting methods were used to establish the routes, walking speeds, direction of travel, and destinations of migrating crabs, as well as crab numbers and distribution. The density of crabs ranged from 0.09 to 0.57 crabs per square meter, which gave a population estimate of 43.7 million adult crabs… 
Field Observations of Moulting and Moult Increment in the Red Land Crab, Gecarcoidea Natalis (Brachyura, Gecarcinidae), on Christmas Island (Indian Ocean)
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The data provide evidence that the metabolic responses of migrating individuals of G. natalis might be different from those at other times of the year, and fighting for burrows in which breeding occurs produced severe anaerobiosis in males, especially the victors.
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  • P. Green
  • Environmental Science, Geography
  • 2004
Abstract This study quantified the burrow dynamics of the gecarcinid land crab Gercarcoidea natalis (Pockock, 1888), the most common land crab in rain forest on Christmas Island, Indian Ocean. Mean
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TLDR
The genetic results indicate that G. natalis is a single panmictic population on Christmas Island, with no spatial genetic structure or restricted gene flow apparent between sampled locations, which should simplify conservation efforts for the genetic management of this iconic island species.
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The unusual larval release behavior and choice of surge channels as release sites are suggested as adaptations to life on land, to reduce the chances of being swept away by waves.
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TLDR
The reproductive biology of the land crab Gecarcoidea lalandii was documented on the Hengchun Peninsula, southern Taiwan, and exhibits an unusual larval release behavior while clinging to vertical rock faces in which the ovigerous females drop egg masses into the water without actually entering the water.
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The data provide evidence that the metabolic responses of migrating individuals of G. natalis might be different from those at other times of the year, and fighting for burrows in which breeding occurs produced severe anaerobiosis in males, especially the victors.
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