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  • Five species of the crayfish occur in open waters of the Czech Republic. The noble crayfish Astacus astacus and the stone crayfish Austropotamobius torrentium are two native species occuring in the Czech Republic. The noble crayfish is the most abundant species occuring in brooks, small rivers and ponds. The stone crayfish is highly endangered in the Czech Republik and occurs probably only in the a small Míza brook in the Křivoklát protected area. The narrow clawed crayfish, Astacus leptodactylus (an European species alien in the Czech Republic) occurs mainly in quarry pits in Southern and Eastern Bohemia. Threats to both autochtonous species and also to narrow clawed crayfish are habitat dectruction such as river regulations, and crayfish plague Aphanomyces astaci, spread by introduced American crayfish. The occurrence of North American signal crayfish, Pacifastacus leniusculus is restricted to several sites only. However, the occurence of North American spiny-cheek crayfish, Orconectes limosus whose (en)
  • V současné době se ve volných vodách ČR vyskytuje pět druhů raků: dva jsou původní, a to rak říční (Astacus astacus L.) a rak kamenáč (Austropotamobius torrentium Schr.). Třetím druhem je rak bahenní (Astacus leptodactylus Esch.), který byl na naše územívysazen na konci 19. století jako náhrada za mizejícího raka říčního. Další dva druhy, rak signální (Pacifastacus leniusculus D.) a rak pruhovaný (Orconectes limosus Raf.) pocházejí ze Severní Ameriky.
Title
  • Occurence of the crayfish in the Czech Republic (en)
  • Výskyt raků v ČR
  • Výskyt raků v ČR (cs)
skos:prefLabel
  • Occurence of the crayfish in the Czech Republic (en)
  • Výskyt raků v ČR
  • Výskyt raků v ČR (cs)
skos:notation
  • RIV/60076658:12610/00:00002423!RIV/2001/MZE/126101/N
http://linked.open.../vavai/riv/strany
  • 18
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(EP0960996051)
http://linked.open...iv/cisloPeriodika
  • 1-2
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
  • Kozák, Pavel
  • Policar, Tomáš
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
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  • 731780
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  • RIV/60076658:12610/00:00002423
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  • Česká republika, rak, výskyt (en)
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http://linked.open...ontrolniKodProRIV
  • [E7F4C00CC770]
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  • Bulletin VÚRH Vodňany
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http://linked.open...ichTvurcuVysledku
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http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 36
http://linked.open...iv/tvurceVysledku
  • Kozák, Pavel
  • Policar, Tomáš
issn
  • 0007-389X
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  • 12610
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