APPLIED ISSUES Replacement of the native crayfish Astacus astacus by the introduced species Pacifastacus leniusculus in a Swedish lake: possible causes and mechanisms

1995 ◽  
Vol 33 (2) ◽  
pp. 291-304 ◽  
Author(s):  
BJORN SODER BACK
Keyword(s):  
Introduced Species ◽  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
Native Crayfish

Relaxed attitude towards spreading of alien crayfish species affects protection of native crayfish species: case studies and lessons learnt from a Fennoscandian viewpoint

2020 ◽  
Vol 25 (1) ◽  
pp. 39-46
Author(s):  
Japo Jussila ◽  
Lennart Edsman
Keyword(s):  
Competitive Advantage ◽  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
Signal Crayfish ◽  
Aphanomyces Astaci ◽  
Noble Crayfish ◽  
Native Crayfish ◽  
Chronic Carrier ◽  
Highly Virulent ◽  
Crayfish Species

Abstract The spreading of the alien signal crayfish (Pacifastacus leniusculus) is posing an ongoing threat to native European crayfish species in Fennoscandia, like the native noble crayfish (Astacus astacus). The signal crayfish is commonly a chronic carrier of the crayfish plague (Aphanomyces astaci), thus, in addition to being more competitive than noble crayfish, it also has a competitive advantage in this disease over the noble crayfish. The challenges rising from the introduction of the alien signal crayfish to Sweden, Finland and finally also Norway, are similar in nature. The licensed and unlicensed spreading of this species also has a similar history in these countries. In this paper we describe some of the patters of the spread of alien signal crayfish and highlight the detrimental nature of an alien crayfish, accompanied by a highly virulent disease, to native Fennoscandian crayfish and also to native Fennoscandian ecosystems. A halt to the further spreading of alien signal crayfish in Fennoscandia is the only means to ensure successful conservation outcomes for the noble crayfish.

scholarly journals Native European branchiobdellids on non-native crayfishes: Report from the Czech Republic

2017 ◽  
Vol 77 (1) ◽  
Author(s):  
Martin Bláha ◽  
Filip Ložek ◽  
Miloš Buřič ◽  
Antonín Kouba ◽  
Pavel Kozák
Keyword(s):  
Native Species ◽  
Invasive Alien Species ◽  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
The Czech Republic ◽  
Orconectes Limosus ◽  
The Mean ◽  
Global Threat ◽  
Native Crayfish ◽  
Crayfish Species

Invasive alien species present a global threat to biodiversity, particularly where pathogens and symbionts are involved. Non-native crayfish species can increase their impact on the host ecosystem through introductions of symbiotic fauna. Conversely, non-native crayfishes could serve as hosts for native epibionts, thus substituting for disappearing native crayfishes as well. Here we report the presence of native branchiobdellids on naturalized populations of non-native crayfish Orconectes limosus and Pacifastacus leniusculus living in sympatry with native Astacus astacus. The native crayfish species probably served as a source of Branchiobdella spp. for non-native crayfishes. Two species of Branchiobdella (B. parasita and B. pentadonta) were found on P. leniusculus while only B. parasita was found on O. limosus. The level of colonization of inspected specimens and species was also evaluated. The mean number of branchiobdellids found on P. leniusculus and O. limosus was 26.0±15.9, and 64.8±27.7, respectively. Orconectes limosus was more heavily colonized by Branchiobdella despite being significantly smaller than P. leniusculus. Non-native species were corroborated as suitable to host the native epibionts. 

A comparative study of the physiological condition of native and invasive crayfish in Croatian rivers

Biologia ◽  
2012 ◽  
Vol 67 (1) ◽  
Author(s):  
Andreja Lucić ◽  
Sandra Hudina ◽  
Matej Faller ◽  
Darko Cerjanec
Keyword(s):  
Native Species ◽  
Physiological Condition ◽  
Energy Content ◽  
Abdominal Muscle ◽  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
Orconectes Limosus ◽  
Invasive Crayfish ◽  
Native Crayfish ◽  
Crayfish Species

AbstractThe physiological condition of two invasive crayfish species identified in Croatian rivers (Orconectes limosus and Pacifastacus leniusculus) was compared with that of native crayfish populations (Astacus astacus and A. leptodactylus). Hepatosomatic, gonadosomatic and abdominal muscle indices were examined for all four species and within a specific invadernative pair. The results demonstrate that invasive crayfish had better overall physiological condition when compared to native species, with a higher energy content of the hepatopancreas, abdominal muscle and gonads in invasive than in native species, with the exception of A. leptodactylus females which demonstrated an increased ability to allocate energy to reproduction in comparison with other species. These results also indicate that A. astacus is physiologically more unstable than A. leptodactylus and thus more likely to be outcompeted and replaced by non-indigenous crayfish species.

Interspecific dominance relationship and aggressive interactions in the freshwater crayfishes Astacus astacus (L.) and Pacifastacus leniusculus (Dana)

1991 ◽  
Vol 69 (5) ◽  
pp. 1321-1325 ◽  
Author(s):  
Björn Söderbäck
Keyword(s):  
Limited Resource ◽  
Pacifastacus Leniusculus ◽  
Dominance Order ◽  
Dominance Relationship ◽  
Astacus Astacus ◽  
Aggressive Interactions ◽  
Interspecific Dominance ◽  
Size Groups ◽  
Young Of The Year ◽  
Crayfish Species

Interspecific and intraspecific aggressive interactions in the coexisting crayfish species Astacus astacus and Pacifastacus leniusculus were experimentally studied in the laboratory. Pacifastacus leniusculus strongly dominated aggressive interactions with similar-sized A. astacus in heterospecific pairs of juveniles and adults. Pairs of young-of-the-year were considerably less aggressive than the larger body-size groups, and in this size group neither species was aggressively dominant. The two species showed substantial differences in patterns of aggressive behaviour. A higher frequency of unilateral aggressive acts and much lower frequency and shorter duration of fights in P. leniusculus pairs indicate that this species is more inclined to establish a dominance order than A. astacus. The aggressive dominance of P. leniusculus over A. astacus indicates that P. leniusculus might be able to competitively exclude A. astacus when the species are competing for a limited resource.

COMPARATIVE STUDIES OF CAROTENOIDS IN FOUR SPECIES OF CRAYFISH

Crustaceana ◽  
1999 ◽  
Vol 72 (7) ◽  
pp. 693-700 ◽  
Author(s):  
◽  
Keyword(s):  
Thin Layer ◽  
Comparative Studies ◽  
Pacifastacus Leniusculus ◽  
Carotenoid Content ◽  
Freshwater Crayfish ◽  
Astacus Astacus ◽  
Astacus Leptodactylus ◽  
Orconectes Limosus ◽  
Layer Chromatography ◽  
Crayfish Species

AbstractUsing column and thin-layer chromatography, the authors investigated the presence of carotenoids in the carapaces and muscles of freshwater crayfish species. Fifteen carotenoids were found, among which canthaxanthin, adonixanthin, and astaxanthin were predominant. The highest carotenoid content was revealed in the carapaces of Pacifastacus leniusculus and Astacus astacus and in the muscles of Astacus leptodactylus and Orconectes limosus. En utilisant la chromatographie sur colonnes et en couches minces, les auteurs ont recherche la presence de carotenoodes dans les carapaces et les muscles de plusieurs especes d'ecrevisses. Quinze carotenoodes ont ete trouves, parmi lesquels la canthaxanthine, l'adonixanthine et l'asthaxantine etaient dominantes. Le contenu en carotenoodes le pluseleve a ete trouve dans les carapaces de Pacifastacus leniusculus et Astacus astacus et dans les muscles de Astacus leptodactylus et Orconectes limosus.

scholarly journals Βιολογία και κατανομή των πληθυσμών των ειδών των καραβίδων στα εσωτερικά νερά της Ελλάδας

2010 ◽  
Author(s):  
Κωνσταντίνος Περδικάρης
Keyword(s):  
Pacifastacus Leniusculus ◽  
Astacus Astacus ◽  
Astacus Leptodactylus ◽  
Cherax Quadricarinatus ◽  
Austropotamobius Torrentium

[…] Οι στόχοι της παρούσας διατριβής ήταν: α) η διερεύνηση και αποτύπωση της κατανομής των αυτόχθονων και αλλόχθονων ειδών καραβίδας στον ελληνικό χώρο, τόσο σε επίπεδο οικοσυστήματος όσο και σε επίπεδο νομών και περιφερειών και η ακόλουθη δημιουργία χαρτών σημειακής κατανομής (spot maps). Ιδιαίτερη έμφαση δόθηκε στην προσπάθεια εντοπισμού των ειδών Pacifastacus leniusculus (Dana, 1852) στο φυσικό περιβάλλον και Cherax quadricarinatus (von Martens, 1868) σε ελεγχόμενο περιβάλλον (ενυδρεία), καθώς του είδους Astacus leptodactylus Eschscholtz 1823 εντός της ελληνικής επικράτειας. Επιπρόσθετα επιχειρήθηκε ο εντοπισμός νέων θέσεων παρουσίας των ειδών Astacus astacus (Linnaeus, 1758) και Austropotamobius torrentium (Schrank, 1803), καθώς και η επιβεβαίωση ιστορικών θέσεων παρουσίας τους ανά την Ελλάδα. β) η διερεύνηση της παρουσίας επιβιωτικών ειδών δακτυλιοσκλωλήκων του γένους Branchiobdella σε τρία διαφορετικά είδη καραβίδας στον ελληνικό χώρο (A. astacus, A. leptodactylus και A. torrentium) βάσει δειγμάτων από συνολικά επτά διαφορετικά οικοσυστήματα. Παράλληλα διερευνήθηκε η πιθανότητα παρουσίας του παρασιτικού ολιγόχαιτου Hystricosoma chappuisi Michaelsen 1926, το οποίο υπό ορισμένες συνθήκες μπορεί να προκαλέσει σοβαρές θνησιμότητες σε φυσικούς πληθυσμούς. γ) η μελέτη περίπτωσης (case study) αναφορικά με την εκτίμηση της κατάστασης του πληθυσμού του είδους A. astacus στον ποταμό Καλαμά. δ) η συγκέντρωση της υφιστάμενης διεθνούς και εθνικής νομοθεσίας που σχετίζεται με ζητήματα προστασία των πληθυσμών των αυτόχθονων ειδών, που ρυθμίζουν την αλιεία τους και την εισαγωγή αλλόχθονων ειδών στη χώρα, με στόχο την διαμόρφωση προτάσεων βελτίωσης και προσαρμογής της εθνικής νομοθεσίας ώστε να ικανοποιεί τις προϋποθέσεις προστασίας των ειδών και των πληθυσμών τους με ταυτόχρονη αλιευτική αξιοποίησή των καραβίδων. […]

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