Host demography influences the prevalence and severity of eelgrass wasting disease.
Host demography influences the prevalence and severity of eelgrass wasting disease.
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宿主人口统计影响鳗草消耗性疾病的患病率和严重程度。
DOI：
10.3354/dao02709
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发表时间：
2014
影响因子：
1.4
通讯作者：
S. Wyllie
中科院分区：
文献类型：
--
作者：
M. Groner;C. Burge;C. Couch;Catherine J. S. Kim;Gregor;Sonia Singhal;Samantha C. Smoot;A. Jarrell;J. Gaydos;C. D. Harvell;S. Wyllie
许多海洋病原体是机会主义者，存在于环境中，但只有在某些条件下才会致病，例如由于环境压力或年龄等宿主因素造成的免疫抑制。在温带鳗草中，机会性迷路真菌病原菌带状迷宫菌存在于许多种群中，偶尔会引起严重的消耗性疾病流行；然而，与这些流行病相关的危险因素尚不清楚。我们进行了实地调查和实验操作，以检验叶龄(从叶片大小推断)对美国华盛顿州圣胡安群岛不同地点的滨海斑潜蝇枯萎病患病率和严重程度的影响。我们通过组织学鉴定病原体和接种迷宫真菌培养，证实了现场观察到的损伤是由活动性迷路感染引起的。从观察到的病变中分离出来的。我们发现，在较浅的深度和较大的叶片大小的所有地点，疾病流行率增加，这种影响在下降的地点更加明显。用2个带状乳杆菌菌株进行实验接种证实，较老的叶片对感染的敏感性增加。总体而言，这种模式表明，成熟的鳗草床和浅滩的鳗草可能特别容易爆发消耗性疾病。这项研究强调了在评估来自机会性病原体的疾病风险时考虑宿主和环境因素的重要性。
Many marine pathogens are opportunists, present in the environment, but causing disease only under certain conditions such as immunosuppression due to environmental stress or host factors such as age. In the temperate eelgrass Zostera marina, the opportunistic labyrinthulomycete pathogen Labyrinthula zosterae is present in many populations and occasionally causes severe epidemics of wasting disease; however, risk factors associated with these epidemics are unknown. We conducted both field surveys and experimental manipulations to examine the effect of leaf age (inferred from leaf size) on wasting disease prevalence and severity in Z. marina across sites in the San Juan Archipelago, Washington, USA. We confirmed that lesions observed in the field were caused by active Labyrinthula infections both by identifying the etiologic agent through histology and by performing inoculations with cultures of Labyrinthula spp. isolated from observed lesions. We found that disease prevalence increased at shallower depths and with greater leaf size at all sites, and this effect was more pronounced at declining sites. Experimental inoculations with 2 strains of L. zosterae confirmed an increased susceptibility of older leaves to infection. Overall, this pattern suggests that mature beds and shallow beds of eelgrass may be especially susceptible to outbreaks of wasting disease. The study highlights the importance of considering host and environmental factors when evaluating risk of disease from opportunistic pathogens.
硬壳蛤 Mercenaria Mercenaria 的原生生物寄生虫 QPX 是迷宫菌门 (Labyrinthulomycota) 的成员。
影响因子：
1.4
作者：
Ragan,MA;MacCallum,GS;Murphy,CA;Cannone,JJ;Gutell,RR;McGladdery,SE
通讯作者：
McGladdery,SE