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Reframing Lake Geneva ecological trajectory in a context of multiple but asynchronous pressures
Journal of Paleolimnology ( IF 2.1 ) Pub Date : 2021-01-27 , DOI: 10.1007/s10933-021-00176-y
Rosalie Bruel , Stéphanie Girardclos , Aldo Marchetto , Katrina Kremer , Christian Crouzet , Jean-Louis Reyss , Pierre Sabatier , Marie-Elodie Perga

Regime shifts are major reorganization of ecological processes, creating new sets of mechanisms that drive the new ecological regime. Such rearrangements can affect how and how much the system responds to pressures other than those that created the shift (interactive carryover). Lake Geneva still exhibits high levels of productivity despite reductions in phosphorus to its reference baseline; the continued high productivity is likely due to the synergistic effects of climate change. We tested whether the contemporary Lake Geneva plankton community response to air temperature, one symptom of climate change, differed from the responses to past changes in air temperature. We used paleoecology to quantify the changes in plankton communities, as a proxy of general ecological changes, over the past 1500 years. Our results show that from 563 AD (beginning of the record) to the twentieth century, the cladoceran assemblage remained stable, despite climate variability of 3 °C in air temperature. The plankton community of Lake Geneva appeared to shift for the first time in the 1500 year record in 1946, and dynamic linear models suggested that 1958–1961 was a critical transition period when the ecosystem changed state. Littoral species were lost, and the assemblage became dominated by pelagic species. The shift took place around the beginning of the current long-term monitoring program, when local perturbations (eutrophication) were escalating. Our results suggest that eutrophication acted as a switch towards a lake more vulnerable to climate change.

中文翻译:

在多重但不同步的压力背景下重构日内瓦湖生态轨迹

体制转变是生态过程的重大重组,创造了驱动新生态体制的新机制。这种重新安排会影响系统对压力的反应方式和程度,而不是那些造成转变的压力(交互式结转)。尽管磷已减少到其参考基线,但日内瓦湖仍然表现出高水平的生产力;持续的高生产力很可能是由于气候变化的协同效应。我们测试了当代日内瓦湖浮游生物群落对气温(气候变化的一种症状)的反应是否与过去对气温变化的反应不同。我们使用古生态学来量化过去 1500 年来浮游生物群落的变化,作为一般生态变化的代表。我们的结果表明,从公元 563 年(记录的开始)到 20 世纪,尽管气温的气候变化为 3°C,枝角类动物的组合仍然保持稳定。日内瓦湖浮游生物群落似乎在 1946 年的 1500 年记录中首次发生转变,动态线性模型表明 1958-1961 年是生态系统改变状态的关键过渡期。沿海物种消失了,组合成为中上层物种的主导。这种转变发生在当前长期监测计划开始时,当时局部扰动(富营养化)正在升级。我们的结果表明,富营养化是向更容易受到气候变化影响的湖泊的转变。尽管气温有 3°C 的气候变化。日内瓦湖浮游生物群落似乎在 1946 年的 1500 年记录中首次发生转变,动态线性模型表明 1958-1961 年是生态系统改变状态的关键过渡期。沿海物种消失了,组合成为中上层物种的主导。这种转变发生在当前长期监测计划开始时,当时局部扰动(富营养化)正在升级。我们的结果表明,富营养化是向更容易受到气候变化影响的湖泊的转变。尽管气温有 3°C 的气候变化。日内瓦湖浮游生物群落似乎在 1946 年的 1500 年记录中首次发生转变,动态线性模型表明 1958-1961 年是生态系统改变状态的关键过渡期。沿海物种消失了,组合成为中上层物种的主导。这种转变发生在当前长期监测计划开始时,当时局部扰动(富营养化)正在升级。我们的研究结果表明,富营养化是向更容易受到气候变化影响的湖泊的转变。动态线性模型表明,1958-1961 年是生态系统改变状态的关键过渡期。沿海物种消失了,组合成为中上层物种的主导。这种转变发生在当前长期监测计划开始时,当时局部扰动(富营养化)正在升级。我们的结果表明,富营养化是向更容易受到气候变化影响的湖泊的转变。动态线性模型表明,1958-1961 年是生态系统改变状态的关键过渡期。沿海物种消失了,组合成为中上层物种的主导。这种转变发生在当前长期监测计划开始时,当时局部扰动(富营养化)正在升级。我们的结果表明,富营养化是向更容易受到气候变化影响的湖泊的转变。
更新日期:2021-01-27
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