Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, USA.
Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, USA.
J Invertebr Pathol. 2018 Jan;151:82-90. doi: 10.1016/j.jip.2017.11.004. Epub 2017 Nov 7.
Coastal marine and estuarine environments are experiencing higher average temperatures, greater frequency of extreme temperature events, and altered salinities. These changes are expected to stress organisms and increase their susceptibility to infectious diseases. However, beyond these generalities, little is known about how environmental factors influence host-pathogen relationships in the marine realm. We investigated the prevalence and intensity of infections by Vibrio cholerae, V. parahaemolyticus, and V. vulnificus in blue crabs, Callinectes sapidus, from Louisiana saltmarshes in relation to temperature and salinity. We evaluated relationships for single measurements taken at the time of collection and for more complex measurements representing accumulated exposure to physiologically-stressful environmental conditions for up to 31 days prior to collection. We found that: (1) prevalence of infection varied across the Louisiana coast, (2) prevalence of all three Vibrio species was influenced by temperature and salinity, and (3) measurements that represent accumulated exposure to extreme conditions are useful predictors of infection prevalence and can provide insights into underlying biological mechanisms.
沿海海洋和河口环境正经历着更高的平均温度、更频繁的极端温度事件以及变化的盐度。这些变化预计会对生物造成压力，增加其感染传染病的易感性。然而，除了这些普遍性的情况之外，对于环境因素如何影响海洋领域中的宿主-病原体关系，我们知之甚少。我们调查了路易斯安那盐沼中蓝蟹（Callinectes sapidus）中霍乱弧菌、副溶血性弧菌和创伤弧菌感染的流行率和强度与温度和盐度的关系。我们评估了在收集时单次测量和更复杂的测量之间的关系，这些复杂的测量代表了在收集前长达 31 天的生理应激环境条件下的累积暴露。我们发现：（1）感染的流行率在路易斯安那沿海地区有所不同；（2）所有三种弧菌的流行率都受到温度和盐度的影响；（3）代表对极端条件累积暴露的测量是感染流行率的有用预测指标，并可以深入了解潜在的生物学机制。
