Zooplankton biomass dynamics in oligotrophic versus eutrophic conditions: a test of the PEG model
Zooplankton biomass dynamics in oligotrophic versus eutrophic conditions: a test of the PEG model
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DOI：
10.1111/fwb.12484
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发表时间：
2015
影响因子：
2.7
通讯作者：
D. Straile
中科院分区：
文献类型：
--
作者：
D. Straile
摘要1.国际湖沼学会（SIL）浮游生物生态学工作组的模型（以下简称PEG模型）是描述贫营养和富营养湖泊中季节性浮游植物和浮游动物演替的模式和驱动因素的口头模型（Sommer等人，1986年）。尽管是一个经典的引用，PEG模型的测试贫营养和富营养湖泊之间的浮游动物生物量动态的差异是缺乏的。2.在这里，我使用的长期数据，从博登湖，在过去的100年中，从（超）贫营养湖泊的富营养化湖泊，并回到贫营养湖泊浮游动物生物量的季节性分析营养状态差异。从一个湖的数据允许一个研究营养生物量动态的影响，而没有混淆的影响，湖泊的地理环境和湖泊形态，复杂的比较动态富营养化与贫营养化湖泊。然而，由于其他驱动因素，例如气候变化，环境变化也可能改变生物量动态。3.博登湖的数据不支持浮游动物季节性的差异，在富营养化和贫营养化湖泊之间的峰值时间的PEG模型建议。而总的浮游动物生物量，以及枝水蚤和桡足类生物量在5月/6月在所有营养条件下显示出一个高峰。春季枝角类生物量动态受水温的影响比受营养状态的影响更大。此外，Sommer等人（1986年）对湖泊地理环境的分析表明，富营养化湖泊和贫营养化湖泊之间浮游动物季节性的差异至少部分是由于湖泊海拔环境的混淆效应;贫营养化湖泊位于比富营养化湖泊更高的海拔。4.由于康斯坦茨湖的结果，以及Sommer等人（1986年）研究中发现的偏差，提出了一个修改的PEG模型，该模型认为低水温而不是食物限制是贫营养和富营养湖泊早春浮游动物生长率降低的最重要因素。
SUMMARY 1. The model of the International Society of Limnology (SIL) Plankton Ecology working group (hereafter the PEG model) is a verbal model describing the patterns and driving factors of seasonal phytoplankton and zooplankton succession in oligotrophic and eutrophic lakes (Sommer et al., 1986). Despite being a citation classic, tests of the PEG model with respect to differences in zooplankton biomass dynamics between oligotrophic and eutrophic lakes are lacking. 2. Here, I use the long-term data from Lake Constance, which during the last 100 year changed from an (ultra-) oligotrophic lake to a eutrophic lake and back to an oligotrophic lake to analyse trophic status differences in zooplankton biomass seasonality. Using data from one lake allows one to study trophic influences on biomass dynamics without the confounding effects of lake geographical setting and lake morphology, which complicate comparative dynamics in eutrophic versus oligotrophic lakes. However, environmental changes due to other driving factors, for example climate change, may possibly alter biomass dynamics as well. 3. Data from Lake Constance do not support the differences in zooplankton seasonality in respect to peak timing between eutrophic and oligotrophic lakes suggested by the PEG model. Rather total zooplankton biomass, as well as cladoceran and copepod biomass showed a peak in May/June during all trophic conditions. Biomass dynamics of cladocerans during spring were more strongly influenced by water temperature than by trophic state. Furthermore, analyses of the geographical setting of the lakes considered in Sommer et al. (1986) suggest that the proposed differences in zooplankton seasonality between eutrophic and oligotrophic lakes are at least partially due to the confounding effect of lake altitudinal setting; the oligotrophic lakes were located at higher altitude than the eutrophic lakes. 4. As a consequence of the results from Lake Constance, and the bias detected in the Sommer et al. (1986) study, a modified PEG model is proposed which considers low water temperature and not food limitation as the most important factor reducing zooplankton growth rate during early spring in both oligotrophic and eutrophic lakes.