Potamon ibericum
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Potamon ibericum |
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| ( Bieberstein , 1808) |
Potamon ibericum is a local crayfish from the family of Potamidae . The large distribution area of the species extendsfrom south-eastern Europe to central Asiawith numerous, in some cases, widely isolated ( disjoint ) occurrences, in southern France it isnaturalizedas a neozoon . As a freshwater crab , Potamon ibericum lives instreams and rivers whose temperature does not fall below 5 ° C. The animals are omnivores and go ashore to forage at night, and during the day when it rains. The species can survive without water for a long time in high humidity.
At least the stocks in the Ukraine and on some islands are declining sharply due to habitat destruction, pollution and overexploitation . Potamon ibericum is therefore classified by the IUCN as a type of warning list ( near threatened ).
description
In Potamon ibericum is Carapaxoberseite smooth, the carapace looks flat as a whole. The front side edge of the carapace is narrow and sawed regularly. The male's abdomen is slender, triangular and the sides of the abdomen are slightly convex . The male's first gonopodium has a spindle-shaped end member, the subterminal member is slightly elongated. The flexible part between the end link and sub-terminal link is club-shaped. The second gonopodium is on the mesial (inner) side of the first gonopodium and is elongated.
distribution and habitat
The large distribution area of the species extends from south-east Europe to Central Asia with numerous, in part widely isolated ( disjoint ) occurrences. The area extends from the north-eastern Greek mainland and the islands of the northern Aegean over the catchment area of the middle and lower Danube , the other tributaries on the south and southeast coast of the Black Sea and the Caucasus to the tributaries of the southern Caspian Sea in Iran and in Turkmenistan . In addition, the species is naturalized as a neozoon in southern France . The deposit is located in the Herault River near St. Guilhem le Desert about 350 km west of Nice.
Potamon ibericum inhabits streams and rivers. Cyprus is settled at altitudes where the water temperature does not fall below 5 ° C. The species bridges a temporary drying out of its living water in the river bed in deep tubes and under stones. The species can survive without water for a long time in high humidity.
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Way of life
The animals go ashore to forage at night, and during the day when it rains. Potamon ibericum is extremely omnivorous and eats plant and animal material of all kinds. Decayed plant material, fallen leaves, filamentous green algae , worms, amphipods , insect larvae, molluscs , tadpoles , frogs, fish and carrion have been identified as food . Reproduction takes place in the warm months from June to October. After hatching, the young remain under the abdomen of the female for 5 to 7 days and during this time they reach carapace widths of about 3.6 mm. Then the young leave the female and live independently.
Existence and endangerment
At least the stocks in the Ukraine and on some islands are declining sharply due to habitat destruction, pollution and overexploitation. Potamon ibericum is therefore classified by the IUCN as a type of warning list ( near threatened ).
swell
Individual evidence
- ^ D. Brandis, V. Storch, M. Türkay: Taxonomy and zoogeography of the freshwater crabs of Europe, North Africa and the Middle East. Senckenbergiana biologica 1 (2), 2000: pp. 5-56, here pp. 22-25.
- ^ D. Brandis, V. Storch, M. Türkay: Taxonomy and zoogeography of the freshwater crabs of Europe, North Africa and the Middle East. Senckenbergiana biologica 1 (2), 2000: pp. 5–56, here pp. 22–25 and distribution map p. 52
- ↑ a b c Potamon ibericum in the endangered Red List species the IUCN 2011. Posted by: Cumberlidge, N., 2008. Accessed August 9, 2011th
literature
- D. Brandis, V. Storch, M. Türkay: Taxonomy and zoogeography of the freshwater crabs of Europe, North Africa and the Middle East. Senckenbergiana biologica 1 (2), 2000: pp. 5-56.
Web links
- Potamon ibericum in the endangered Red List species the IUCN 2011. Posted by: Cumberlidge, N., 2008. Accessed August 9, 2011th
