The East Usambara tree‐hole crab (Brachyura: Potamoidea: Potamonautidae) − a striking example of crustacean adaptation in closed canopy forest, Tanzania
Identifieur interne : 000789 ( Istex/Curation ); précédent : 000788; suivant : 000790The East Usambara tree‐hole crab (Brachyura: Potamoidea: Potamonautidae) − a striking example of crustacean adaptation in closed canopy forest, Tanzania
Auteurs : J. Bayliss [Royaume-Uni]Source :
- African Journal of Ecology [ 0141-6707 ] ; 2002-03.
Descripteurs français
- Wicri :
- geographic : Tanzanie.
- topic : Protection de la forêt, Eau douce, Forêt naturelle.
English descriptors
- KwdEn :
- Adult crabs, Available tree holes, Bernard verdcourt, Biol, Botany department, Bromeliad crab, Calcium levels, Cannicci, Canopy forest, Coastal forests, Crab, Crabs, Crustacean adaptation, Cumberlidge, Cumberlidge sachs, Dead trees, Decapoda, Diesel, East africa, East african, East usambara, East usambara catchment forest project, East usambara crab, East usambara forest research programme, East usambara mountains, East usambara species, East usambaras, Eastern usambara mountains, Ecol, Equal variances, Family groups, Forest conservation, Forest edge, Freshwater, Freshwater crabs, Freshwater species, Future research, Genus potamonautes, Globonautes macropus, Grapsidae, High levels, Hole depth, Homing experiments, Immature stages, Juvenile crabs, Leaf litter snails, Life society, Lowest point, Macropus, Magoroto hill, Mangifera indica, Mango tree, Metopaulias depressus, Natural forest, Neavei, Nest structure, Omnivorous diet, Parental care, Potamonautes, Primitive lungs, Raybould, Rock crevices, Same tree hole, Sesarma, Sesarma cookei, Simulium, Simulium neavei, Simulium neavei roubaud, Snail, Snail shell, Snail shells, Standard deviation, Tanzania, Tree hole, Tree hole water, Tree holes, Tree species, Tree trunks, Undescribed species, Unoccupied, Unoccupied holes, Unoccupied tree holes, Unoccupied trees, Unoccupied trees correlation, Usambara, Usambaras, Vannini, Water balance.
- Teeft :
- Adult crabs, Available tree holes, Bernard verdcourt, Biol, Botany department, Bromeliad crab, Calcium levels, Cannicci, Canopy forest, Coastal forests, Crab, Crabs, Crustacean adaptation, Cumberlidge, Cumberlidge sachs, Dead trees, Decapoda, Diesel, East africa, East african, East usambara, East usambara catchment forest project, East usambara crab, East usambara forest research programme, East usambara mountains, East usambara species, East usambaras, Eastern usambara mountains, Ecol, Equal variances, Family groups, Forest conservation, Forest edge, Freshwater, Freshwater crabs, Freshwater species, Future research, Genus potamonautes, Globonautes macropus, Grapsidae, High levels, Hole depth, Homing experiments, Immature stages, Juvenile crabs, Leaf litter snails, Life society, Lowest point, Macropus, Magoroto hill, Mangifera indica, Mango tree, Metopaulias depressus, Natural forest, Neavei, Nest structure, Omnivorous diet, Parental care, Potamonautes, Primitive lungs, Raybould, Rock crevices, Same tree hole, Sesarma, Sesarma cookei, Simulium, Simulium neavei, Simulium neavei roubaud, Snail, Snail shell, Snail shells, Standard deviation, Tanzania, Tree hole, Tree hole water, Tree holes, Tree species, Tree trunks, Undescribed species, Unoccupied, Unoccupied holes, Unoccupied tree holes, Unoccupied trees, Unoccupied trees correlation, Usambara, Usambaras, Vannini, Water balance.
Abstract
An undescribed species of freshwater crab with a remarkable life history was studied over 2 years in areas of natural forest in the East Usambara Mountains, north‐east Tanzania. It was found occupying the water‐filled boles (tree holes) of several tree species at altitudes between 150 and 900 m asl, a single tree species Myrianthus holstii accounted for 26% of all trees identified as such. There was no apparent association with other freshwater bodies. The ‘tree‐hole crab’ is largely nocturnal but will also forage by day during periods of heavy rainfall, leaving its tree hole in search of leaf‐litter molluscs. Once located it carries pieces of the snail shell back to the tree hole and releases these into the water filled bole which is typically acidic. This releases calcium ions (Ca2+) into solution from the snail shell resulting in a more neutral solution (mean pH = 6.6, standard deviation (s) = 0.46, n = 25). This act provides a source of dissolved calcium for the development of exoskeletons following ecdysis. Significant differences were found between depth (P = 0.01) and height (P = 0.05) of occupied and unoccupied water‐filled tree holes. This is the first record of a crab exhibiting such behaviour in East Africa.
Url:
DOI: 10.1046/j.0141-6707.2001.00333.x
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to="34">34</biblScope><publisher>Blackwell Science, Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2002-03">2002-03</date></imprint><idno type="ISSN">0141-6707</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0141-6707</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult crabs</term><term>Available tree holes</term><term>Bernard verdcourt</term><term>Biol</term><term>Botany department</term><term>Bromeliad crab</term><term>Calcium levels</term><term>Cannicci</term><term>Canopy forest</term><term>Coastal forests</term><term>Crab</term><term>Crabs</term><term>Crustacean adaptation</term><term>Cumberlidge</term><term>Cumberlidge sachs</term><term>Dead trees</term><term>Decapoda</term><term>Diesel</term><term>East africa</term><term>East african</term><term>East usambara</term><term>East usambara catchment forest project</term><term>East usambara crab</term><term>East usambara forest 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lungs</term><term>Raybould</term><term>Rock crevices</term><term>Same tree hole</term><term>Sesarma</term><term>Sesarma cookei</term><term>Simulium</term><term>Simulium neavei</term><term>Simulium neavei roubaud</term><term>Snail</term><term>Snail shell</term><term>Snail shells</term><term>Standard deviation</term><term>Tanzania</term><term>Tree hole</term><term>Tree hole water</term><term>Tree holes</term><term>Tree species</term><term>Tree trunks</term><term>Undescribed species</term><term>Unoccupied</term><term>Unoccupied holes</term><term>Unoccupied tree holes</term><term>Unoccupied trees</term><term>Unoccupied trees correlation</term><term>Usambara</term><term>Usambaras</term><term>Vannini</term><term>Water balance</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Adult crabs</term><term>Available tree holes</term><term>Bernard verdcourt</term><term>Biol</term><term>Botany department</term><term>Bromeliad crab</term><term>Calcium levels</term><term>Cannicci</term><term>Canopy forest</term><term>Coastal forests</term><term>Crab</term><term>Crabs</term><term>Crustacean adaptation</term><term>Cumberlidge</term><term>Cumberlidge sachs</term><term>Dead trees</term><term>Decapoda</term><term>Diesel</term><term>East africa</term><term>East african</term><term>East usambara</term><term>East usambara catchment forest project</term><term>East usambara crab</term><term>East usambara forest research programme</term><term>East usambara mountains</term><term>East usambara species</term><term>East usambaras</term><term>Eastern usambara mountains</term><term>Ecol</term><term>Equal variances</term><term>Family groups</term><term>Forest conservation</term><term>Forest edge</term><term>Freshwater</term><term>Freshwater crabs</term><term>Freshwater species</term><term>Future research</term><term>Genus potamonautes</term><term>Globonautes macropus</term><term>Grapsidae</term><term>High levels</term><term>Hole 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It was found occupying the water‐filled boles (tree holes) of several tree species at altitudes between 150 and 900 m asl, a single tree species Myrianthus holstii accounted for 26% of all trees identified as such. There was no apparent association with other freshwater bodies. The ‘tree‐hole crab’ is largely nocturnal but will also forage by day during periods of heavy rainfall, leaving its tree hole in search of leaf‐litter molluscs. Once located it carries pieces of the snail shell back to the tree hole and releases these into the water filled bole which is typically acidic. This releases calcium ions (Ca2+) into solution from the snail shell resulting in a more neutral solution (mean pH = 6.6, standard deviation (s) = 0.46, n = 25). This act provides a source of dissolved calcium for the development of exoskeletons following ecdysis. Significant differences were found between depth (P = 0.01) and height (P = 0.05) of occupied and unoccupied water‐filled tree holes. This is the first record of a crab exhibiting such behaviour in East Africa.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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