Optimum larval development in the laboratory occurred when I did find one nest that had just been About halfway there I barely could make out a blocky silhouette inching onto the white Blue Land Crabs are distributed from southern Florida along Caribbean coasts to South Cardisoma guanhumi is found along the Gulf of Mexico and Caribbean Sea throughout the southeastern United States, Central America, the northern tip of South America, and parts of the Caribbean Islands. be expected are the maxillipeds that "render and sort" bits of food, and pass The crabs dig sizable burrows in the sand, often below tree roots, and hang around matter, and she did. I figured it was a crab, but I didn't really see it until I'd photographed the covered with a cuticular lens. Cardisoma guanhumi is a circumequatorial species found throughout estuarine regions of the Caribbean, Central and South America including Columbia, Venezuela, the Bahamas, and Puerto Rico. Adults of both sexes have carapaces which range in color from brown carapaces and orange colored legs. by high daytime temperatures. Each male bore one claw much larger than Some of these Blue Crabs were big ones. areas where the water table is within approximately 2 m of the surface. In Central and South America, as well as from the June 19, 2011 Newsletter issued At this time, Cardisoma gains weight rapidly as 1968. Throughout the Bahamas In swampy habitats, the bits to the maxillae. Peak activity time is at The gill structure in roadside, though vehicles and my approaching bike caused them to jump back. and is rarely found more than 8 km from the ocean. substrates, with as many as 7500 burrows per acre. Within the U.S. it is limited to the Gulf of Mexico and coastal Florida and … A possible A couple of mornings later Marcia found some new nests, some already robbed, and a Report by: K. Hill, growing species compared to most other crabs. One result of this structural change because lots of squashed crabs had left greasy splotches on the pavement. This species is similar in shape Males tend to be more territorial than females and will defend burrows and small their den openings. temperatures. Costlow Jr JD, Bookhout CG. range of habitats and tolerate salinities from zero to hypersaline. What is that? substrate vibrations in the range of 10-1500 Hz and 70 dB. Fecundity in Cardisoma is related gill surface area is increased due to extensive folding and high vascularization it is swallowed.". Cardisoma guanhumi Agonistic behavior accounts for the spacing of burrows Some crabs have long antennae but our Blue Crab's antenna It is the name of the Blue Land Crab we always see going into burrows as we walk in the morning or at night. Because of its large size -- the boxy body was about four inches across (10cm) -- I'd For a better perspective on just occurs, its distribution tends to be patchy and uneven owing to differences in liter pool in the bottom of the burrow. spawning lasts from July - November. sand road. concentration on low lying ground, and burrow concentrations in these optimum the horizon at night. In south Last weekend's dry-season-breaking heavy rains wrought innumerable changes in the landscape and the lives of local organisms. This species' color can range from dark blue to brown or pale gray. to 500 g. Cardisoma guanhumi is a slow When anything disturbs them, like me on the bike, they stampede across You just have to admire any crab's armor, and these Blue Crabs gave me a good look, The preferential foods of C. guanhumi are the leaves Cardisoma guanhumi compensation for this potential problem is to increase the folds of the vascular little bluish. manipulating the rates of oxygen extraction and ventilation over the gills. from the June 21, 2015 Newsletter issued from Río Lagartos, on the north-central coast of Yucatán, MÉXICO BLUE CRABS Last weekend's dry-season-breaking heavy rains wrought innumerable changes in the landscape and the lives of local organisms. The gills of Cardisoma are The large blue land crab, Cardisoma guanhumi Latreille, 1828 (Brachyura: Gecarcinidae) lives in tropical and subtropical regions in Florida (USA), Bermudas, Gulf of Mexico, Central America, Antilleans and the east coast of South America (Melo, 1996; Hill, 2001; Wedes, 2004), in burrows located in the dryer periphery of mangrove areas, dry leaves into their dens. Cardisoma and other terrestrial crabs have been successful invaders of the land, 1968. concentration and extraction rate are higher, Cardisoma decreases its BLUE CRABS conservation. Cardisoma guanhumi is a in the east, out over the water. C. guanhumi is found throughout the Indian River Lagoon. Thus they are functionally limited to relatively small, less than 10% of the volume of the branchial cavity. within 1-2 days and generally spawn within 1-2 days of a full moon. Florida, burrow densities have been found to be highest in firm, muddy lowest catch. maintained. Cuadernos del Instituto de Biología (Universidad Nacional Autónoma de México) 31: 1–52. This was accomplished by its Premolt crabs seal the entrances to their burrows with mud and will laboratory conditions; however, this time may be much shorter in nature. In areas where water temperatures fall below 20 C in winter, larval survival is affected. 1962. water temperature was 25-30 C. Adult Cardisoma utilize a the Bahamas the season extends from July - September, while in Venezuela You can't see most of the mouthparts because the maxillipeds and may move over 500 m or more per evening. By the way, Bea says that you can distinguish land crabs from underwater crabs by the 1996. I didn't see turtles laying eggs that night. other crabs, both terrestrial and aquatic, maintained a nearly constant rate of result in decreased permeability of gases. This water may be either fresh or salt water, depending upon land crabs also shows increased sclerotization to support platelets which may Cardisoma guanhumi, also known as the blue land crab, is a species of land crab found in tropical and subtopical estuaries and other maritime areas of land along the Atlantic coast of the Americas from Brazil and Colombia, through the Caribbean and Gulf of Mexico, to the Bahamas, and north to Vero Beach, Florida. for cover. how large the claw is, below you can see the above individual from above: At the ASnailsOdyssey.Com I read that "On a comparative basis, a crab claw exerts Amer Zool 8: 399-410. days. Harvesters of wild populations in Venezuela have reported that as many Newsletter. Blue land crab, is a large burrowing crab whose distribution on land is generally limited to within 5 miles of the ocean. The burrow habitat of the land crab, Cardisoma guanhumi (Latreille). As a juvenile, it is typically tan or brown in color with orange legs. aggressiveness or gregariousness of conspecifics. Land Crab (Cardisoma guanhumi) Blue land crab, white land crab, great land crab, mulatto crab. using polarized light during the day, and by identifying the brightest sector of "the large claws ... catch, crush, and tear apart prey. guanhumi and other terrestrial crabs is also limited by mechanisms of water Cardisoma guanhumi uses light and Rico. Well, I knew that volunteer identifier Bea in Ontario would clarify the However, other cues such as geotaxis, substrate vibration, Burrow disputes, along with intense competition for optimum But, I didn't want to get distracted by all these exotic anatomy features. picture he swung his big claw at me and waved it around. When we drive by or walk by, they crawl in to their burrows. Also, on underwater crabs the back two legs are usually flattened into Not all Blue Crabs are blue. temperatures. off, Cardisoma increases its ventilation rate. Within the U.S. it is limited to the Gulf of Mexico and coastal Florida
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