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首页> 外文期刊>Coral reefs: journal of the International Society for Reef Studies >Dynamics of Black Band Disease in a Diploria strigosa population subjected to annual upwelling on the northeastern coast of Venezuela
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Dynamics of Black Band Disease in a Diploria strigosa population subjected to annual upwelling on the northeastern coast of Venezuela

机译：委内瑞拉东北海岸遭受多年上升浪的线虫种群的黑带病动态

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摘要

Temporal variability of Black Band Disease (BBD) prevalence, incidence, recurrence, recovery and virulence was estimated in a Diploria strigosa population from an upwelling zone of Venezuela, for 1 year between August 2004 and August 2005. The sampling spanned both upwelling and non-upwelling seasons, and included three samplings, roughly 60 days apart, within each season. The negative effects of BBD epizootiology in the sampling population (El Mercado reef) were positively correlated with sea surface temperature (taken as an upwelling estimator). Disease prevalence, incidence and recurrence decreased significantly during upwelling, and the recovery rate increased. Contrary to expectations, tissue mortality did not decrease significantly during the upwelling season, remaining at 1.2 +/- 0.7 mm day(-1). BBD prevalence, and the ensuing rates of tissue mortality were higher than values previously reported for other Caribbean reefs, even during upwelling episodes, suggesting that nutrient enrichment of the local waters by upwelling counteracts the expected reductions of the disease prevalence and virulence due to the lower temperature. Colonies which had previously been infected with BBD were up to six times more susceptible to new infections than those which were not infected during the preceding 7 months, suggesting that the infected colonies never healed completely. The high variability between tissue mortality values among coral colonies also suggests that overall host health-status may alter susceptibility to BBD infections.
机译：在2004年8月至2005年8月之间的一年中，估计委内瑞拉上升流区的Diploria strigosa种群的黑带病（BBD）患病率，发病率，复发，恢复和毒力的时间变异性。抽样涵盖上升流和非上升流。上升季节，并在每个季节内进行了三个采样，间隔约60天。 BBD流行病学对抽样人群（萨尔瓦多梅尔卡多礁）的负面影响与海面温度正相关（被用作上升流估算器）。在上涌过程中，疾病患病率，发病率和复发率均明显降低，并且恢复率有所提高。与预期相反，在上升季节中组织死亡率没有显着降低，保持在1.2 +/- 0.7毫米天（-1）。甚至在上升期间，BBD的患病率以及随之而来的组织死亡率也高于先前报道的其他加勒比礁的值，这表明上升引起的局部水域营养富集抵消了由于较低的发病率而导致的疾病患病率和致病性降低温度。以前感染过BBD的菌落对新感染的敏感性是前7个月未感染菌落的六倍，这表明被感染的菌落从未完全治愈。珊瑚群落之间的组织死亡率值之间的高变异性也表明，宿主的总体健康状况可能会改变对BBD感染的易感性。

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