Institut National des Sciences et Technologies de la Mer, La Goulette Port de Pêche, 2060 Tunisia.
Environ Monit Assess. 2013 Apr;185(4):3369-82. doi: 10.1007/s10661-012-2797-4. Epub 2012 Jul 27.
To attempt to determine the effects of temperature and salinity on the dynamics of the dinoflagellate community, a monthly sampling was carried out from October 2008 to March 2009 at eight sampling stations in Ghar El Melh Lagoon (GML; Mediterranean Sea, Northern Tunisia). Dinoflagellates were dominant among plankton, accounting for 73.9 % of the lagoon's overall plankton community, and were comprised of 25 different species among which 17 were reported in the literature as harmful. While no significant difference was found in the distribution of dinoflagellates among the stations, a strong monthly difference was observed. This temporal variability was due to an increase in the abundance of Prorocentrum micans from December to February, leading to a strong decrease in the Shannon diversity index from station to station. At the onset of P. micans development, dinoflagellate abundances reached 1.26.10(5) cells l(-1). A redundance analysis indicates that both temperature and salinity have a significant effect on the dynamics of the dinoflagellate community. Using a generalized additive model, both temperature and salinity appear to have significant nonlinear relationships with P. micans abundances. Model predictions indicate that outbreaks of P. micans may occur at a temperature below 22.5 °C and with salinity above 32.5. We discuss our results against a backdrop of climate change which, by affecting temperature and salinity, is likely to have an antagonistic impact on P. micans development and subsequently on the dinoflagellate dynamics in GML.
为了尝试确定温度和盐度对甲藻群落动态的影响，我们于 2008 年 10 月至 2009 年 3 月在突尼斯北部地中海的盖尔梅尔泻湖（Ghar El Melh Lagoon，GML）的 8 个采样点进行了每月一次的采样。浮游生物中甲藻占主导地位，占泻湖浮游生物群落的 73.9%，由 25 个不同的物种组成，其中 17 种在文献中被报道为有害。尽管在各个站点之间，甲藻的分布没有明显差异，但在每月的变化上存在强烈的差异。这种时间变化是由于从 12 月到 2 月期间 Prorocentrum micans 的丰度增加导致 Shannon 多样性指数从一个站点到另一个站点的强烈下降。在 P. micans 发育的开始时，甲藻的丰度达到了 1.26.10(5) 个细胞 l(-1)。冗余分析表明，温度和盐度对甲藻群落的动态都有显著影响。使用广义加性模型，温度和盐度似乎与 P. micans 的丰度呈显著的非线性关系。模型预测表明，P. micans 的爆发可能发生在温度低于 22.5°C 和盐度高于 32.5 的情况下。我们根据气候变化的背景讨论了我们的结果，气候变化通过影响温度和盐度，可能对 P. micans 的发育产生拮抗影响，并随后对 GML 中甲藻的动态产生影响。
