Environmental nitrate impacts foraging and agonistic behaviours of invasive non-native crayfish (Pacifastacus leniusculus and Faxonius virilis)

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Joanna James ◽  
John R. Thomas ◽  
Alberto Maceda-Veiga ◽  
Robbie Mitchell ◽  
Ian P. Vaughan ◽  
...  
Keyword(s):  
Pacifastacus Leniusculus ◽  
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.

The spatial distribution of Aphanomyces astaci genotypes across Europe: introducing the first data from Ukraine

2020 ◽  
Vol 25 (1) ◽  
pp. 77-87 ◽  
Author(s):  
Elena Ungureanu ◽  
Michaela MojŽiŠovÁ ◽  
Michiel Tangerman ◽  
Mihaela C. Ion ◽  
Lucian Parvulescu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Middle East ◽  
Eastern Europe ◽  
Pacifastacus Leniusculus ◽  
Signal Crayfish ◽  
Aphanomyces Astaci ◽  
Western Palaearctic ◽  
Native Crayfish ◽  
Available Information ◽  
Mass Mortalities

Abstract Aphanomyces astaci is the causative agent of crayfish plague, a disease responsible for numerous mass mortalities of native crayfish across Europe. In this study, we aim to extend knowledge about the A. astaci distribution in Eastern Europe, with specific focus on the River Dnieper (Ukraine), and summarize presently available information about the distribution of genotypes of this pathogen across the Western Palaearctic. We compiled published records about genotype groups of A. astaci, assembled them to a comprehensive map, and added the newly obtained results from Ukraine. The native narrow-clawed crayfish Pontastacus leptodactylus was sampled from the river Dnieper in Svydivok and Kiev, ca 170 km apart, and screened for the pathogen presence in soft cuticles by quantitative PCR. We confirmed infections by A. astaci at both sites, with prevalence exceeding 30% and low to medium agent levels in infected crayfish. Pathogen genotyping confirmed the presence of the A. astaci haplogroup B, associated with the signal crayfish Pacifastacus leniusculus but also known from some chronically infected narrowclawed crayfish from Turkey and Moldova. Our results support the notion that latent A. astaci infections among narrow-clawed crayfish populations may be widespread in Eastern Europe and the Middle East.

scholarly journals Should Redclaw Crayfish be introduced to Fiji?

1995 ◽  
Vol 2 (4) ◽  
pp. 312
Author(s):  
Roger Lowery
Keyword(s):  
Pacifastacus Leniusculus ◽  
River Systems ◽  
Cherax Quadricarinatus ◽  
Austropotamobius Pallipes ◽  
Aphanomyces Astaci ◽  
Large Populations ◽  
New Locations ◽  
The Uk ◽  
Native Crayfish ◽  
Redclaw Crayfish

Whenever a new organism comes on the aquaculture scene there is a rush to try it out and to introduce the species to new locations. Such was the case with Pacifastacus leniusculus in Europe in the early 1980s. In the UK there was at the time no legislation to control such introductions and commercial pressures ensured that the species was soon widely distributed throughout the UK. One consequence was the introduction of the Crayfish Plague Aphanomyces astaci which resulted in the destruction of large populations of the native crayfish Austropotamobius pallipes in several river systems. It was against this background that I came to learn of a proposal to introduce Cherax quadricarinatus to Fiji in 1991. The commercial proposal was put to the Department of Fisheries who were considering accepting it when, on the basis of experience with crayfish in the UK, I proposed that there should be a delay while the species was evaluated for its likely effect on the Fijian fauna.

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.

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