Spatio-temporal patterns of perkinsosis in the Manila clam Ruditapes philippinarum from Arcachon Bay (SW France)
Spatio-temporal patterns of perkinsosis in the Manila clam Ruditapes philippinarum from Arcachon Bay (SW France)
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DOI：
10.3354/dao02243
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发表时间：
2010-09-02
影响因子：
1.4
通讯作者：
Trumbic, Zeljka
中科院分区：
文献类型：
--
作者：
Dang, Cecile;de Montaudouin, Xavier;Trumbic, Zeljka
属于帕金虫属的病原体感染世界各地的许多双壳类软体动物物种，包括菲律宾蛤仔（Ruditapes phihppinarum）。我们调查了这种寄生虫在整个阿尔卡雄湾（法国西南部）的34个站点的空间分布。帕金森病的患病率为93%，平均感染丰度为96 × 10（3）个细胞g（-1）湿鳃。最低的平均丰度被发现接近莱尔河口和显着的负相关性，观察到平均丰度和盐度之间。在盐度和其他环境参数稳定的海洋地点，帕金森病是罕见的。本研究的第二个目的是调查在阿尔卡雄湾内的4个站点在年度周期的帕金森病。发病率和发病强度（+/-SE）都很高，平均在70 - 100%之间，湿鳃为130 x 10（3）+/- 6.7 x 10（3）个细胞g（-1）。没有明显的季节性周期。蛤感染9毫米壳长和感染增加蛤的大小。第三个目的是通过21个月的相互移植，确定消毒和感染动力学，自由区和高度受影响的网站。消毒似乎是一个非常缓慢的过程，并且在帕金虫属有利条件下的部位与在不利条件下的部位相似。相反，感染的获得似乎是间歇性的，具有空间限定的区域。因此，总体上缺乏明确的季节性感染模式被解释为偶发性感染事件和缓慢的消毒动力学的结合。
Pathogens belonging to the genus Perkinsus infect many bivalve molluscan species around the world, including the Manila clam Ruditapes phihppinarum. We investigated the spatial distribution of this parasite at 34 stations throughout Arcachon Bay (SW France). Prevalence of perkinsosis was 93% and mean infection abundance was 96 x 10(3) cells g(-1) wet gill. Lowest mean abundances were found close to the Leyre River mouth and a significant negative correlation was observed between mean abundance and salinity. Perkinsosis was rare at the oceanic site where salinities and other environmental parameters were stable. A second aim of this study was to survey perkinsosis during annual cycles at 4 sites within Arcachon Bay. Prevalence and intensities (+/-SE) of the disease were high, on average between 70 and 100%, and 130 x 10(3) +/- 6.7 x 10(3) cells g(-1) wet gill. No seasonal cycle was evident. Clams were infected at 9 mm shell length and infection increased with clam size. The third objective was to determine the disinfection and infection kinetics through a 21 mo reciprocal transplantation between a nearly Perkinsus sp.-free area and a highly affected site. Disinfection appeared to be a very slow process and was similar at the site with favorable conditions for Perkinsus sp. as at the site with unfavorable conditions. Conversely, infection acquisition appeared to be episodic with spatially defined areas. Consequently, the overall lack of a clear seasonal infection pattern is interpreted as the combination of episodic infection events and slow disinfection kinetics.