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.

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.

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.

Invasive American crayfish Pacifastacus leniusculus (Decapoda: Astacidae) in the Morava River (Slovakia)

Biologia ◽  
2007 ◽  
Vol 62 (3) ◽  
Author(s):  
Adam Petrusek ◽  
Tereza Petrusková
Keyword(s):  
Czech Republic ◽  
Pacifastacus Leniusculus ◽  
The Czech Republic ◽  
Potential Vector ◽  
Signal Crayfish ◽  
Morava River ◽  
Native Crayfish ◽  
Near Future ◽  
Crayfish Species ◽  
Invasive Capability

AbstractThe signal crayfish, Pacifastacus leniusculus (Dana, 1852), was recorded in the Slovak-Austrian stretch of the Morava (March) River in the Záhorie region in August 2006. This is the first confirmed record of a non-indigenous crayfish species of American origin in Slovakia. Most likely, signal crayfish were intentionally released to the river by Austrian fishermen, or invaded from adjacent water bodies in Austria. As this species has a substantial invasive capability and is a potential vector of the crayfish plague pathogen, it represents a threat to the native crayfish species and its spread should be monitored. Its invasion upstream to the territory of the Czech Republic is not unlikely in near future.

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.

scholarly journals The current distribution of the freshwater crayfish (Decapoda: Astacidae, Cambaridae) in the Neman river basin in Belarus

2020 ◽  
Vol 65 (2) ◽  
pp. 182-190
Author(s):  
A. V. Alekhnovich ◽  
D. V. Molotkov ◽  
K. Śliwińska
Keyword(s):  
Invasive Species ◽  
Alien Species ◽  
River Basin ◽  
Current Distribution ◽  
Native Species ◽  
Local Community ◽  
Freshwater Crayfish ◽  
Gravel Pits ◽  
Native Crayfish ◽  
Crayfish Species

The trends in the distribution and occurrence of the freshwater crayfish in the water bodies of the Neman River basin are presents. It has been shown that both native species: the noble and the narrow-clawed crayfish are declined and/or are displaced with rapidly expanding its range the invasive spiny-cheek crayfish. In recent years the alien species was found in isolated gravel pits and lakes, where it could be transferred only by the human activity. These findings confirm the need of the education about the threats posed by the invasive species on the native biodiversity especially with the local community, which is an obligatory practice for protection the native species in the area expanded with non-native crayfish species. Further, to increase the likelihood of the local biodiversity conservation it is highly needed to undertake targeted actions aimed at resettling endangered populations into waterbodies unavailable for the invasive spiny-cheek crayfish expansion.

scholarly journals An ongoing saga: Endemic branchiobdellidans (Annelida: Clitellata) on translocated commercial North American crayfish

Zoosymposia ◽  
2020 ◽  
Vol 17 (1) ◽  
pp. 141-158
Author(s):  
STUART R. GELDER
Keyword(s):  
North America ◽  
North American ◽  
Host Species ◽  
Procambarus Clarkii ◽  
East Asian ◽  
Pacifastacus Leniusculus ◽  
Orconectes Limosus ◽  
The World ◽  
Commercial Species ◽  
Crayfish Species

Over the last 130 years demand for crayfish has exceeded regional supplies around the world, so stocks, primarily from North America, have been imported to satisfy this need. These demands are human based and include gastronomy, sport fishing bait, food for rearing animals, educational aides, ornamentation in waterbodies, and more recently a significant increase in pet crayfish sales. The three most common commercial species from North America are Pacifastacus leniusculus, Procambarus clarkii and Orconectes limosus, although four other species are increasing in importance as they become more widely distributed. All of these crayfish in their endemic range have been reported to carry branchiobdellidan annelids. Therefore, when the crayfish are translocated, their ectosymbionts likely accompany them. Eighty-six potentially transportable branchiobdellidans are recognized in this paper, along with the distribution of six species known to have been translocated. Moreover, branchiobdellidans endemic to the translocation regions have adopted introduced crustacean hosts, which demonstrates that branchiobdellidan host species specificity is not as restrictive as many researchers believe. On the evidence to date, these translocated branchiobdellidans appear to have the same relationship and cause the same amount of damage, if any, as those on their endemic crayfish hosts. The geographical distribution of endemic branchiobdellidan—crayfish species associations are unique to each of four disjunct regions as defined by Bănărescu: Euro-Mediterranean, East Asian, western North American and eastern North American; the latter includes eastward drainages from Canada to Costa Rica.

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