Zuleima Santana-Vega, D. Hernández-Becerril, Alejandro Morales-Blake, F. Varona-Cordero, M. Merino-Ibarra
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引用次数: 5
摘要
摘要海洋浮游植物由于其广泛的分布和对生物量和生产力的贡献,已成为了解全球光养生态的重要问题。2011年4月26日至5月7日,我们在墨西哥太平洋中部研究了原核浮游植物原绿球藻和聚藻球菌的丰度、分布和特征色素,这是一个相对不为人知的氧气最低带(OMZ),以及三种环境梯度的影响。原绿球藻和聚球菌的丰度与其他热带地区相当(分别为0.17 ~ 30.37 X 104 cells mL-1和0.9 ~ 30.97 X 104 cells mL-1)。原绿球藻丰度在较深的水域达到最高,通常与第二个深水原位荧光(和叶绿素α)最大值一致,在海洋站,在硝酸盐倾斜之下,而聚球菌丰度在地下水中较高,其浓度最大值通常与地下原位荧光最大值一致,在沿海站的丰度略高。统计分析有力地支持了这些结果。二乙烯基-叶绿素α沿水柱的分布不稳定,偶尔与深层原位荧光最大值重合,而玉米黄质的分布通常遵循叶绿素α和聚球菌丰度的分布,并同时达到峰值。这些结果与先前在研究区和温带地区发现的结果相似,也与OMZ的总体趋势相似,但证实了第二次深叶绿素α最大值归因于高原绿球藻密度。此外,我们还发现原绿球菌和聚藻球菌的丰度和分布受观察到的环境梯度的强烈驱动。
Prokaryotic picoplankton distribution within the oxygen minimum zone of the central Mexican Pacific across environmental gradients
Abstract Marine picophytoplankton has become an important issue to understand the global ecology of phototrophic forms, due to its wide distribution and contribution to biomass and productivity. We studied the abundance, distribution and signature pigments of the prokaryote picophytoplankters Prochlorococcus and Synechococcus during an oceanographic cruise (26 April to 7 May, 2011) in the central Mexican Pacific, a relatively poorly-known oxygen minimum zone (OMZ), and the effect of three environmental gradients. Prochlorococcus and Synechococcus abundances were comparable with those found in other tropical areas (0.17 to 30.37 X 104 cells mL-1, and 0.9 to 30.97 X 104 cells mL-1, respectively). Prochlorococcus abundances reached highest numbers in deeper waters, often coinciding with the second deep in situ fluorescence (and chlorophyll α) maxima, at oceanic stations, below the nitratecline, whereas Synechococcus abundances were higher at subsurface waters and its concentration maxima usually coincided with the subsurface in situ fluorescence maxima, with slightly higher abundances in coastal stations. Statistical analyses support significantly these results. Distribution of divinyl-chlorophyll α was erratic along the water column and occasionally coincided with the deep in situ fluorescence maxima, whereas the distribution of zeaxanthin usually followed that of chlorophyll α and the abundances of Synechococcus, and peaked together. These results are similar to those previously found in the study area and in more temperate zones, and also to the general trend in OMZ, but confirm that the second deep chlorophyll α maxima are attributed to high Prochlorococcus densities. We additionally found the abundance and distribution of Prochlorococcus and Synechococcus strongly driven by the environmental gradients observed.
期刊介绍:
The Brazilian Journal of Oceanography covers the entire spectrum of disciplines within the science of oceanography, publishing articles dealing with the biological oceanography, physical oceanography, marine chemistry, sedimentology and geology, from coastal and estuarine waters out to the open sea. Emphasis is placed on inter-disciplinary process-oriented contributions. BJO also publishes issues dedicated to results of scientific meetings and of large inter-disciplinary studies or topical issues on specific subjects.
The audience is composed by physical, chemical and biological oceanographers, marine sedimentologists, geologists and geochemists, marine biologists and ecologists.
Papers sent to BJO must present results from original research and be written in english.