Microbial processes in cold oceans .1. Relationship between temperature and bacterial growth rate
Microbial processes in cold oceans .1. Relationship between temperature and bacterial growth rate
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DOI：
10.3354/ame010243
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发表时间：
1996-06
影响因子：
1.4
通讯作者：
R. Rivkin;Anderson;C. Lajzerowicz
中科院分区：
文献类型：
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作者：
R. Rivkin;Anderson;C. Lajzerowicz
尽管高纬度海洋与生物源碳的模型和预算有着明显的相关性，但人们对该地区通过低层食物网的能量流动的季节性模式知之甚少。有人认为，在高纬度和寒冷的海洋中，细菌的代谢和生长速率很低，比浮游植物和后生动物异养生物的代谢和生长速率受到更大程度的抑制。低温抑制细菌生长将减少微生物食物网的活动，细菌将消耗和回收更少的初级产品，更多的浮游植物碳将可用于后生动物食草动物。这种情景对海洋碳流模型的影响是深远的。在本文中，我们提出了一个分析66发表的研究，从世界海洋，包括极地地区的温度和细菌的生长速度，并检查浮游细菌生长在季节性寒冷的纽芬兰（加拿大东部）沿海沃茨的实地调查结果。基于对已发表数据的分析，其中约50%的观测结果来自小于或等于4摄氏度的环境，我们报告了比生长率（SGR）与温度之间的弱关系（r（2）- 0.058，n = 231），Q（10）= 1.5。冷（小于或等于4摄氏度）和暖（>4摄氏度）沃茨中细菌的平均（0.39至0.41天（-1））和中值（0.25至0.29天（-1））SGR没有显著差异。对于已发表的数据以及纽芬兰Conception Bay的田间研究，当根据经验胸苷转换因子计算时，SGR显著大于（p < 0.01）理论或文献推导的胸苷转换因子。我们的分析表明，从寒冷和温带海洋浮游细菌的生长速率是相似的，在各自的环境温度下，当适当的转换因子被用来计算增长。我们建议，细菌为基础的食物网和微生物营养途径是重要的整体能量和物质循环在高纬度的海洋，因为它们是在低纬度。
Despite the obvious relevance of the high latitude oceans to models and budgets of biogenic carbon, the seasonal patterns of energy flow through the lower food web in this region are poorly understood. It has been suggested that, in high latitude and cold oceans, the rates of bacterial metabolism and growth are low and are depressed to a much greater degree than those of co-occurring phytoplankton and metazoan heterotrophs. The low-temperature suppression of bacterial growth would reduce microbial food web activity, bacteria would consume and recycle less primary production and more phytoplankton carbon would be available to metazoan grazers. The implications of this scenario for models of oceanic carbon flow are profound. In this paper, we present an analysis of 66 published studies on temperature and growth rate for bacteria from the World Ocean, including polar regions, and examine the results of a field investigation of bacterioplankton growth in seasonally cold Newfoundland (eastern Canada) coastal waters. Based upon the analysis of published data, where approximately 50 % of the observations were from environments less than or equal to 4 degrees C, we report a weak (r(2) - 0.058, n = 231) relationship between specific growth rate (SGR) and temperature with a Q(10) = 1.5. The mean (0.39 to 0.41 d(-1)) and median (0.25 to 0.29 d(-1)) SGR of bacteria from cold (less than or equal to 4 degrees C) and warm (>4 degrees C) waters were not significantly different. For both the published data as well as for the field study in Conception Bay, Newfoundland, the SGR was significantly greater (p < 0.01) when computed from empirical thymidine conversion factors than from theoretical or literature derived thymidine conversion factors. Our analysis suggests that the growth rates of bacterioplankton from cold and temperate oceans are similar at their respective ambient temperatures, when the appropriate conversion factors are used to compute growth. We propose that bacteria-based food webs and microbial trophic pathways are as important in overall energy and material cycling in high latitude oceans as they are at lower latitudes.