UR 103, CAMELIA, UMR 5119 ECOLAG, Université Montpellier II, Case 093, 34095 Montpellier, France.
Mar Pollut Bull. 2010;61(7-12):335-48. doi: 10.1016/j.marpolbul.2010.06.019.
We assessed the temporal variability of nutrients, phytoplankton and bacterioplankton at two sites of different trophic status in New Caledonia's South-West lagoon, a tropical coastal ecosystem. During stable meteorological conditions, Chl.a, bacterial production and nutrient concentrations experience weak but consistent daily variation. Short-term (1-2 week interval) fluctuations of planktonic variables are in the same range as annual variations at both sites. A part of these short term variations is linked to local meteorological events (wind in the main channel, precipitation at the coastal station). Although annual variations are weak compared to short term variations, phytoplankton and bacterioplankton production show consistent temporal patterns, with maxima in December-January and April-May and minima in August. Annual bacterial production represents 21% and 34% of particulate primary production at the oligotrophic and mesotrophic sites, respectively. Mineral nutrient availability indicates that nitrogen is probably the primary limiting factor of phytoplankton throughout the year.
我们评估了新喀里多尼亚西南泻湖两个不同营养状态站点的营养物质、浮游植物和浮游细菌的时间变异性，这是一个热带沿海生态系统。在稳定的气象条件下，Chl.a、细菌生产力和营养浓度经历微弱但一致的日变化。浮游生物变量的短期（1-2 周间隔）波动与两个站点的年度变化处于同一范围。这些短期变化的一部分与当地气象事件（主通道的风、沿海站的降水）有关。尽管与短期变化相比，年度变化较弱，但浮游植物和浮游细菌生产力表现出一致的时间模式，最大值在 12 月至 1 月和 4 月至 5 月，最小值在 8 月。在贫营养和中营养站点，年度细菌生产力分别代表颗粒初级生产力的 21%和 34%。矿物营养物质的可利用性表明，氮可能是全年浮游植物的主要限制因素。
