Inferring long-term changes in the physical-chemical environment of the shallow, enriched Lake Nero from statistical and functional analyses of its phytoplankton
Inferring long-term changes in the physical-chemical environment of the shallow, enriched Lake Nero from statistical and functional analyses of its phytoplankton
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DOI：
10.1093/plankt/fbm055
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发表时间：
2007-09
影响因子：
2.1
通讯作者：
O. Babanazarova;O. Lyashenko
中科院分区：
文献类型：
--
作者：
O. Babanazarova;O. Lyashenko
对大型、浅水且高度富营养化的涅罗湖开阔水域的浮游植物、水柱中无机氮和磷酸盐浓度以及叶绿素a进行了定性和定量研究，以及其季节和空间变化的研究，研究时间跨度超过十年（1988 - 1989年以及1999 - 2003年）。在观测期间，浮游植物的平均定性特征保持稳定；然而，短期来看，结构和功能特征极不稳定。这存在争议，但可能是由于生态系统对环境压力具有高度的适应性。已使用季节丰度参数内的物种频率，以及以功能群评估物种（SFG）表示的群落优势的额外数据。使用相关性和因子分析来评估选定环境因素对SFG发展的影响强度。在我们分析所涵盖的时期内，选定参数总是与第一主成分密切相关，第一主成分主要由与水下光场相关的特性所主导。根据我们的调查，涅罗湖的浮游植物呈现出一种常见的组合：S1丝状蓝细菌与C硅藻以及参与的J绿藻、M和H1固氮类型。这是浅水、营养丰富湖泊的典型特征，包含在光照差的条件下表现良好的物种。个别物种的优势地位会发生变化，但严格局限于构成S1组合的物种之间。已证明完全符合PROTECH（浮游植物对环境变化的响应）模型的两个假设。
The qualitative and quantitative studies of the phytoplankton, concentration of inorganic nitrogen and phosphate and chlorophyll a in the water column and its seasonal and spatial variation have been studied in the open water of the large, shallow and highly eutrophic Lake Nero over periods representing more than one decade (1988-1989 and 1999-2003). The average qualitative characteristics of phytoplankton have remained stable over the period of observations; however, structural and functional characteristics have been highly unstable in the short term. This is controversial but may be due to the high robustness of the ecosystem to the environmental stresses. The frequencies of species within seasonal-abundance parameters have been used, together with additional data on the dominance of the community expressed in terms of evaluated Species of the Functional Groups (SFG). Correlation and factor analyses were used to estimate the strength of selected environmental factors on the development of SFG. In the periods covered by our analyses, the selected parameters were always strongly correlated with first principal components, which were dominated by properties relating to the underwater light field. According to our investigation, the phytoplankton of Lake Nero supports a commonly occurring combination S1 filamentous cyanobacteria with C diatoms and participation J greens, M and H1 dinitrogen-fixing types. It is typical of shallow, nutrient-rich lakes, comprising species that perform well under conditions of poor light. Individual species dominance caries but strictly among species making up the S1 association. Full accord with the two hypotheses of the PROTECH (Phytoplankton RespOnses To Environmental CHange) model has been demonstrated.