Population growth of Gyrodactylus salaris (Monogenea) on Norwegian and Baltic Atlantic salmon (Salmo salar) stocks
Population growth of Gyrodactylus salaris (Monogenea) on Norwegian and Baltic Atlantic salmon (Salmo salar) stocks
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DOI：
10.1017/s0031182000006971
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发表时间：
2000-12-01
期刊：
影响因子：
2.4
通讯作者：
Bakke, TA
中科院分区：
文献类型：
--
作者：
Cable, J;Harris, PD;Bakke, TA
在12.5°c +/-0.2°c的3种鲑鱼种群上，对利尔涅瓦河鲑的繁殖成功率进行了实验比较。从2个易感的挪威种群（利尔河和阿尔塔河）和1个耐药的波罗的海鲑鱼种群（涅瓦河）分离出来的鱼被单一的妊娠标准感染，以便记录个体寄生虫出生的时间顺序和死亡的年龄。建立成功率（蠕虫存活分娩的比例）通常较低，死亡率较高，但涅瓦河上的蠕虫存活率（45%，平均存活3.5天）明显低于阿尔塔鱼和利尔鱼（60%，平均存活7.9天和5.2天）。寄主种群之间的寄生虫繁殖力存在显著差异：涅瓦河鱼只产卵2次，而阿尔塔鱼和利尔鱼都有第三次和第四次产卵。与阿尔塔鱼和涅瓦河鱼（18天）相比，涅瓦河鱼的首次分娩时间变化更大，明显延长（平均2.3天）。然而，第二次出生的时间在3个鲑鱼种群中没有任何变化。年龄特异性死亡率和繁殖力数据表明，salaris在Alta和Lier鱼上呈指数增长，但最终在Neva鱼上灭绝。这是第一次证明，维持在不同宿主种群上的回肠虫在繁殖力、发育和死亡率方面表现出差异，这可能反过来解释了当salaris感染不同鲑科宿主时所注意到的不同毒力。
Reproductive success of Gyrodactylus salaris from River Lierelva was compared experimentally on 3 stocks of salmon (12.5 degreesC+/-0.2). Isolated fish from 2 susceptible Norwegian stocks (Rivers Lier and Alta) and 1 resistant Baltic stock of salmon (River Neva) were infected with a single gravid norm in order to record the temporal sequence of births and age at death of individual parasites. Establishment success (proportion of worms surviving to give birth) was generally low and mortality high, but significantly fewer worms survived on Neva (45 %, with mean survival of 3.5 days) compared to Alta and Lier fish (60 %, mean survival 7.9 and 5.2 days, respectively). There was a dramatic difference in parasite fecundity between the host stocks: only 2 births occurred on Neva fish compared to third and fourth births on both Alta and Lier hosts. The timing of the first birth was more variable on Neva hosts and was significantly extended (mean 2.3 days) relative to that on Alta and Neva fish (18 days). However, timing of the second birth did not vary on any of the 3 salmon stocks. Age-specific mortality and fecundity data are consistent with exponential population growth of G. salaris on Alta and Lier fish but eventual extinction on Neva hosts. This is the first demonstration that gyrodactylids maintained on different host stocks exhibit variations in fecundity, development and mortality, which may in turn account for the variable virulence noted when G. salaris infects different salmonid hosts.