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The effects of a warm spring on phytoplankton and zooplankton population dynamics in small eutrophic lakes in the Canadian prairies: Implications of a changing climate.

机译:温暖的春天对加拿大大草原中富营养化小湖中浮游植物和浮游动物种群动态的影响:气候变化的影响。

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摘要

Climate projections predict warming trends for the Canadian prairies. This study investigated effects of warmer spring temperatures on phytoplankton-zooplankton populations in small eutrophic lakes. A two-year study of three eutrophic lakes with contrasting spring weather conditions, i.e., 2005--a 'normal' spring and 2006--a warm spring (+2°C), demonstrated that warmer water temperatures were associated with increased total phytoplankton and relative cyanobacteria biomass and a shift in zooplankton dominance from daphniids to rotifers. Zooplankton hatching experiments and computer simulations tested the hypothesis that a warm spring differently affected daphniid and rotifer emergence from resting eggs. Experimental conditions mimicking an earlier spring (shorter photoperiod) resulted in fewer daphniid but not rotifer hatchlings, and computer simulations indicated that these changes in hatching success could be responsible for shifts from daphniid- to rotifer-dominated systems. Overall, a warm spring negatively affected daphniid populations, indirectly by increasing cyanobacteria prevalence and directly by decreasing hatching success.
机译:气候预测预测了加拿大大草原的变暖趋势。这项研究调查了春季温度升高对富营养化小湖中浮游植物-浮游动物种群的影响。对三个富营养化湖泊进行了为期两年的研究,春季气候条件相反,即2005年为“正常”春季,2006年为温暖的春季(+ 2°C),表明水温升高与总浮游植物的增加有关和相对的蓝细菌生物量以及浮游动物的优势从蚤类到轮虫的转变。浮游动物的孵化实验和计算机模拟验证了这样的假设,即温暖的泉水从静止的卵中不同地影响了蚤形和轮虫的出现。模仿较早春天(较短的光周期)的实验条件导致较少的水蚤孵化,但没有轮虫的孵化,计算机模拟表明,孵化成功的这些变化可能是由以水蚤为主的系统转变为以轮虫为主的系统的原因。总体而言,温暖的春季对蓝藻种群造成了负面影响,间接地通过增加蓝细菌的流行率而直接降低了孵化的成功率。

著录项

  • 作者

    Dupuis, Alain.;

  • 作者单位

    University of Manitoba (Canada).;

  • 授予单位 University of Manitoba (Canada).;
  • 学科 Biology Limnology.
  • 学位 M.Sc.
  • 年度 2008
  • 页码 157 p.
  • 总页数 157
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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