Plankton metabolism in surface waters of the tropical and subtropical Pacific Ocean
Plankton metabolism in surface waters of the tropical and subtropical Pacific Ocean
复制标题
热带和亚热带太平洋表层水中浮游生物的代谢
DOI：
10.3354/ame01451
复制
发表时间：
2011
影响因子：
1.4
通讯作者：
M. Church
中科院分区：
文献类型：
--
作者：
D. A. Viviani;K. Björkman;D. Karl;M. Church
我们在从南太平洋副热带环流（SPSG）到北太平洋副热带环流（NPSG）的跨赤道巡航期间测量了中太平洋浮游生物代谢并评估了浮游生物群落结构的变化。在近表层海洋沃茨中，基于光暗瓶测量的氧产生和消耗，确定了净群落生产率（NCP）和呼吸率（R）。计算总初级生产力（GPP），其中GPP = NCP + R。贫营养SPSG和NPSG的GPP和R率紧密耦合，导致NCP为零或略负。这些亚热带沃茨的特点是无机营养物浓度非常低（例如硝酸盐+亚硝酸盐范围：0.004至0.033 µmol l-1）。在相对富营养的赤道沃茨（例如硝酸盐+亚硝酸盐浓度范围：0.67至5.7 µmol l-1），GPP超过R高达5倍，导致NCP阳性。GPP变化约16倍（0.25至4.05 µmol O2产生l-1 d-1），而R变化约5倍（0.31至1.56 µmol O2消耗l-1 d-1）。微型浮游生物细胞丰度和诊断色素生物标志物被用来确定浮游植物群落结构的区域差异。在近赤道沃茨中，聚球藻属和光合微真核生物的丰度分别增加了100倍和10倍，真核浮游植物（包括硅藻、浮游植物和附着植物）的诊断色素生物标志物也增加了。这些结果表明，营养盐可利用性的变化构成了一个重要的调节器的净生产力和浮游生物群落结构的大区域的开放的海洋。
We measured plankton metabolism and evaluated changes in plankton community structure within the central Pacific Ocean during a trans-equato- rial cruise from the South Pacific Subtropical Gyre (SPSG) to the North Pacific Subtropical Gyre (NPSG). Rates of net community production (NCP) and respira- tion (R) were determined in near-surface ocean waters, based on light-dark bottle measurements of oxygen production and consumption. Gross primary produc- tion (GPP) was computed, where GPP = NCP + R. Rates of GPP and R in the oligotrophic SPSG and NPSG were tightly coupled, resulting in NCP that was either zero or slightly negative. These subtropical waters were characterized by very low concentrations of inorganic nutrients (e.g. nitrate+nitrite range: 0.004 to 0.033 µmol l -1 ). Within the relatively nutrient-enriched equa- torial waters (e.g. nitrate+nitrite concentrations range: 0.67 to 5.7 µmol l -1 ), GPP exceeded R by up to 5-fold, resulting in positive NCP. GPP varied ~16-fold (0.25 to 4.05 µmol O2 produced l -1 d -1 ) while R varied ~5-fold (0.31 to 1.56 µmol O2 consumed l -1 d -1 ). Picoplankton cell abundances and diagnostic pigment biomarkers were used to determine regional differences in phyto- plankton community structure. In the near-equatorial waters, abundances of Synechococcus and photosyn- thetic picoeukaryotes increased up to 100- and 10-fold, respectively, and diagnostic pigment biomarkers for eukaryotic phytoplankton (including diatoms, pelago- phytes, and haptophytes) also increased. These results indicate that variability in nutrient availability consti- tutes an important regulator of net productivity and plankton community structure in large regions of the open ocean.
影响因子：
2.5
作者：
Hickman, A. E.;Dutkiewicz, S.;Follows, M. J.
通讯作者：
Follows, M. J.