Reproductive trade-offs may moderate the impact of Gyrodactylus salaris in warmer climates.
Reproductive trade-offs may moderate the impact of Gyrodactylus salaris in warmer climates.
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DOI：
10.1371/journal.pone.0078909
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Taylor NG
中科院分区：
文献类型：
--
作者：
Denholm SJ;Norman RA;Hoyle AS;Shinn AP;Taylor NG
salidactylus salaris是一种须呈报的鲑鱼类淡水外寄生虫。它的主要宿主是大西洋鲑鱼（Salmo salar），感染它会导致死亡，并导致挪威鲑鱼数量大幅下降，而这种寄生虫在挪威很普遍。salar S. salar的不同菌株的易感性各不相同，大西洋菌株（如在挪威发现的菌株）对寄生虫没有抵抗力，而波罗的海菌株表现出足以调节宿主上寄生虫数量的先天抵抗力，导致其死亡或维持在低水平。在本研究中，利用Leslie矩阵和区室模型得到的数据表明，在单个寄主上，salaris的种群增长取决于每个寄生虫的后代总数、寿命和出生时间。结果表明，决定沙蚤种群增长速度的关键因素是沙蚤首次生育的时间，生育速度快，种群规模大。此外，研究表明，尽管寄生虫可以生育多达四次，但只要第一次生育发生在寄生虫出生三天之前，这个种群就只需要两次生育。由于已知温度会影响这种寄生虫首次出生的时间，如果将其引入比挪威气候更温暖的国家，如英国和爱尔兰，预计会产生更大的影响，这些国家目前被认为没有G. salaris。然而，本研究中建立的模型的结果表明，温度导致的寄生虫生育后代总数和首次生育时间之间的权衡可能会阻止挪威观察到的种群增长率的增加。
Gyrodactylus salaris is a notifiable freshwater ectoparasite of salmonids. Its primary host is Atlantic salmon (Salmo salar), upon which infections can cause death, and have led to massive declines in salmon numbers in Norway, where the parasite is widespread. Different strains of S. salar vary in their susceptibility, with Atlantic strains (such as those found in Norway) exhibiting no resistance to the parasite, and Baltic strains demonstrating an innate resistance sufficient to regulate parasite numbers on the host causing it to either die out or persist at a low level. In this study, Leslie matrix and compartmental models were used to generate data that demonstrated the population growth of G. salaris on an individual host is dependent on the total number of offspring per parasite, its longevity and the timing of its births. The data demonstrated that the key factor determining the rate of G. salaris population growth is the time at which the parasite first gives birth, with rapid birth rate giving rise to large population size. Furthermore, it was shown that though the parasite can give birth up to four times, only two births are required for the population to persist as long as the first birth occurs before a parasite is three days old. As temperature is known to influence the timing of the parasite's first birth, greater impact may be predicted if introduced to countries with warmer climates than Norway, such as the UK and Ireland which are currently recognised to be free of G. salaris. However, the outputs from the models developed in this study suggest that temperature induced trade-offs between the total number of offspring the parasite gives birth to and the first birth timing may prevent increased population growth rates over those observed in Norway.
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影响因子：
2
作者：
BAKKE, TA;JANSEN, PA;HANSEN, LP
通讯作者：
HANSEN, LP
DOI：
10.1139/cjfas-55-s1-247
发表时间：
1998-01-01
影响因子：
2.4
作者：
Bakke, TA;Harris, PD
通讯作者：
Harris, PD
影响因子：
2.4
作者：
Harris, PD;Soleng, A;Bakke, TA
通讯作者：
Bakke, TA
影响因子：
2.4
作者：
Cable, J;Harris, PD;Bakke, TA
通讯作者：
Bakke, TA
影响因子：
2.7
作者：
LESLIE, PH
通讯作者：
LESLIE, PH