The Prevalence of Crayfish Plague (Aphanomyces Astaci) in Two Signal Crayfish (Pacifastacus Leniusculus) Populations in Finland [PDF]
Journal of Crustacean Biology, 2000 Abstract The occurrence of dark brown melanized spots indicative of the presence of crayfish plague fungus (Aphanomyces astaci Schikora) was investigated in three Finnish lakes inhabited by the introduced American signal crayfish (Pacifastacus leniusculus Dana) in 1979, 1983, 1985–1988, 1990, 1993, and 1994. The crayfish were caught with crayfish traps
Viljo Nylund, Kai Westman
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Response of phase I and II detoxification enzymes, glutathione, metallothionein and acetylcholine esterase to mercury and dimethoate in signal crayfish (Pacifastacus leniusculus). [PDF]
Chemosphere, 2018 Gunderson MP +6 more
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Terrestrial dispersal of invasive signal crayfish during vulnerable life stages [PDF]
Behavioural Processes, 2018 1. Aquatic invertebrates commonly disperse between waterbodies by flight, though some decapods can emigrate from the water and walk overland. 2. The signal crayfish (Pacifastacus leniusculus, Dana) is a highly invasive species that can survive for days to weeks out of water, though it is unclear to what extent vulnerable life stages, such as ovigerous ...
John Rhidian Thomas +3 more
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Cryptic asymmetry: unreliable signals mask asymmetric performance of crayfish weapons [PDF]
Biology Letters, 2012 Animals commonly use their limbs as signals and weapons during territorial aggression. Asymmetries of limb performance that do not relate to asymmetries of limb size (cryptic asymmetry) could substantially affect disputes, but this phenomenon has not been considered beyond primates.
Angilletta, Michael J. Jr. +1 more
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To signal or not to signal? Chemical communication by urine-borne signals mirrors sexual conflict in crayfish [PDF]
BMC Biology, 2010 Sexual selection theory predicts that females, being the limiting sex, invest less in courtship signals than males. However, when chemical signals are involved it is often the female that initiates mating by producing stimuli that inform about sex and/or receptivity.
Breithaupt, Thomas, Berry, Fiona C.
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Impacts of the North American signal crayfish (Pacifastacus leniusculus) on European ecosystems. [PDF]
Environ Sci Eur, 2015 As a vector of the crayfish plague (Aphanomyces astaci), invasive crayfish pose a major threat to endemic crayfish species in Europe. But do they affect whole ecosystems and fish species as well? A comprehensive review was done using online search engines on current literature to elucidate possible crayfish effects.
Vaeßen S, Hollert H.
europepmc +5 more sources
The prevalence of Aphanomyces astaci in invasive signal crayfish from the UK and implications for native crayfish conservation [PDF]
Parasitology, 2017 SUMMARYThe crayfish plague agent, Aphanomyces astaci, has spread throughout Europe, causing a significant decline in native European crayfish. The introduction and dissemination of this pathogen is attributed to the spread of invasive North American crayfish, which can act as carriers for A. astaci.
James, J +6 more
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Knowledge and Management of Aquatic Ecosystems, 2018 In Finland, massive signal crayfish introductions started towards the end of 1980s, with an estimated total of 2.2 million signal crayfish been stocked before year 2016.
Ruokonen Timo J. +6 more
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Lake Hańcza – a new site for signal crayfish (Pacifastacus leniusculus Dana) occurrence in Poland
Archives of Polish Fisheries, 2018 Crayfish catches were conducted using traps in Lake Hańcza, which is the deepest lake in Poland. Two crayfish populations were found to co-exist in the lake: spiny-cheek crayfish (Orconectes limosus Raf.) and signal crayfish (Pacifastacus leniusculus ...
Ulikowski Dariusz, Chybowski Łucjan
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Biocide Treatment of Invasive Signal Crayfish: Successes, Failures and Lessons Learned [PDF]
Diversity, 2019 Signal crayfish, as an invasive alien species in Europe, have caused impacts on aquatic communities and losses of native crayfish. Eradication of recently established populations may be possible in small ponds (<2.5 ha) and short lengths of small watercourses using a nonselective biocide. Between 2004 and 2012, a total of 13 sites in the U.K.
Stephanie Peay +5 more
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