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首页> 外文期刊>Aquatic Biology >Spatial variation in fungal communities isolated from healthy and diseased sea fans Gorgonia ventalina and seawater
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Spatial variation in fungal communities isolated from healthy and diseased sea fans Gorgonia ventalina and seawater

机译：从健康和患病的海扇实蝇（Gorgonia ventalina）和海水中分离出来的真菌群落的空间变化

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摘要

Sea fans Gorgonia ventalina in the Caribbean are being infected by disease attributed to the fungus Aspergillus sydowii. Little is known about the natural fungal community in sea fans, including spatial variation in community composition and the source of inoculum. Patterns of spatial variation may provide important clues to the source of pathogens and etiology of the disease. The objectives of this study were: (1) to measure spatial variation in the mycoflora associated with diseased and healthy colonies of G. ventalina; and (2) to compare the mycoflora of sea fans with the mycoflora isolated from surrounding seawater. Samples of diseased and healthy sea fan tissue and seawater were collected from coral reefs in Puerto Rico. Fungi were isolated and identified by morphology and sequencing of the nuclear ribosomal internal transcribed spacer region. Twenty-six species of fungi were identified. A. flavus was the most common species isolated from both seawater and sea fan tissue. Higher species richness was found in seawater than in sea fans. Mycoflora of healthy and diseased sea fans differed among sites. Fungal species richness in seawater was higher nearshore than offshore. However, community composition in seawater did not vary spatially. The fungal community of sea fans was not different from that of the surrounding seawater, suggesting low specificity. Our data suggest that the source of offshore mycoflora is the nearshore fungal community, with richness diluted as a result of ocean circulation. Prevalence of aspergillosis was not correlated with fungal species richness but was positively correlated with the number of fungal strains isolated. The fact that diseased fans did not have lower species richness suggests that the disease is not due to a single pathogen, but rather to a variety of opportunistic pathogens.
机译：加勒比海的海扇子Gorgonia ventalina受到了真菌sydowii引起的疾病的感染。对海扇中的自然真菌群落知之甚少，包括群落组成的空间变异和接种源。空间变化的模式可能为病原体的来源和病因提供重要线索。这项研究的目的是：（1）测量与G. ventalina的病菌和健康菌落有关的分枝杆菌的空间变异; （2）比较海扇的分枝杆菌与从周围海水中分离出的分枝杆菌。从波多黎各的珊瑚礁收集了患病和健康的海扇组织和海水的样本。分离并通过核糖体内部转录间隔区的形态和测序鉴定真菌。鉴定了26种真菌。黄曲霉是从海水和海扇组织中分离出的最常见物种。海水中的物种丰富度高于海扇中的物种丰富度。健康和患病海扇的支原体在不同地点之间有所不同。海水中真菌的物种丰富度比近海要高。但是，海水中的群落组成在空间上没有变化。海扇的真菌群落与周围的海水没有什么不同，表明特异性较低。我们的数据表明，近海真菌群落的来源是近岸真菌群落，其丰富度由于海洋环流而被稀释。曲霉病的患病率与真菌种类的丰富度无关，但与分离出的真菌菌株的数量呈正相关。患病风扇的物种丰富度较低的事实表明，该疾病不是由于单一病原体，而是由于各种机会性病原体。

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