Horizontal transmission of Thelohania contejeani in the endangered white-clawed (Austropotamobius pallipes) and the invasive signal crayfish (Pacifastacus leniusculus)

被引:10
|
作者
Imhoff, Emily M.
Mortimer, Robert J. G. [2 ]
Christmas, Martin [3 ]
Dunn, Alison M. [1 ]
机构
[1] Univ Leeds, Inst Integrat & Comparat Biol, Fac Biol Sci, Leeds LS2 9JT, W Yorkshire, England
[2] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
[3] Environm Agcy, Millshaw LS11 8PG, England
关键词
Thelohania contejeani; microsporidia; invasive species; biological invasion; Austropotamobius pallipes; Pacifastacus leniusculus; FRESH-WATER CRAYFISH; CHERAX-DESTRUCTOR DECAPODA; SP-NOV MICROSPORA; PARASITE; DYNAMICS; DISEASES; AMPLIFICATION; HENNEGUY;
D O I
10.1017/S0031182012000777
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
The microsporidian parasite Thelohania contejeani causes porcelain disease and has been implicated in mass mortalities in populations of the endangered European crayfish Austropotamobius pallipes. However, the route of parasite transmission is not known. This paper investigates the horizontal transmission of T. contejeani between A. pallipes hosts as well as its transmissibility to the invasive signal crayfish (Pacifastacus leniusculus). Field collected juvenile A. pallipes and P. leniusculus were assigned to 1 of 3 experimental treatments; fed heavily infected A. pallipes tissue, exposed to water from tanks housing heavily parasitized A. pallipes, and a control group to provide an estimate of the baseline infection levels in the field. After 26 weeks, abdominal muscle samples were screened by PCR for T. contejeani. Infection was significantly higher in the treatment groups (83% in the cannibalism treatment, 42% in the water exposure treatment) than in the control group (4%), providing evidence for horizontal transmission of the parasite between A. pallipes hosts. Cannibalism and scavenging are common amongst crayfish, providing transmission opportunities in the field. The study also provides the first direct evidence for transmission of the parasite from an indigenous European crayfish species to the invasive signal crayfish, with 50% of P. leniusculus in each treatment, and 8% of control animals infected. We discuss the possibility that high density populations of the invasive signal crayfish may serve either as reservoirs or sinks for the parasite.
引用
收藏
页码:1471 / 1477
页数:7
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