Basal food resource quality and trophic energy flow across the biofilm-consumer interface: aquatic ecosystem response to environmental stressors

生物膜-消费者界面的基础食物资源质量和营养能量流:水生生态系统对环境压力的反应

基本信息

  • 批准号:
    RGPIN-2019-06603
  • 负责人:
  • 金额:
    $ 2.04万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2021
  • 资助国家:
    加拿大
  • 起止时间:
    2021-01-01 至 2022-12-31
  • 项目状态:
    已结题

项目摘要

Agriculture is the dominant contributor to eutrophication in many watersheds in Canada. Adequate monitoring of potential impacts from agriculture is thus essential to make informed management decisions for freshwater resources. Biological assessment is an approach that provides information on the response of organisms subjected to environmental pressures, allowing for an evaluation of how anthropogenic activities are affecting the biota. To date, bioassessment of aquatic ecosystems has generally been based on changes in taxonomic composition of assemblages. Yet, despite providing reliable estimates of ecosystem health, taxonomy-based indices are focused on individual organism groups (e.g. algae, invertebrates) without evaluating impacts across the food web, and provide limited insight into the effects of stressors that act at the ecosystem scale. There is thus a need to develop biomonitoring tools that incorporate community function and food web dynamics to reflect ecological attributes of whole ecosystems. Fatty acid (FAs) are vital for organisms (e.g., energy, reproduction, cell membranes). Certain essential FAs are transferred from food sources to consumers with no or minimal modification, which is fundamental for invertebrate growth/reproduction and for energy transfer efficiency to higher trophic levels. FA profiles in stream biofilms thus represent a proxy for basal resource quality, i.e., the nutritional quality at the base of the food web. FA profiles change under various conditions, and could be used as a biomarker to evaluate the effects of anthropogenic stressors such as eutrophication and climate warming. However, new knowledge is needed to support the use of FAs in biomonitoring, in particular to confirm the response of this biomarker to eutrophication from agricultural land use in combination with warmer water temperatures. With this NSERC-Discovery grant, I will address five short-term objectives: (1)Quantify the spatial and temporal variability in biofilm FAs; (2)Quantify the response of biofilm FAs under different phosphorus conditions and the relationship with algal taxonomic composition and diatom-based index values; (3)Establish relationships between land use and biofilm FAs to identify thresholds of change; (4)Determine the relationship between biofilm FAs and primary consumer FAs under eutrophic conditions characteristic of agricultural streams; (5)Assess whether the effects of eutrophication on biofilm FAs at the base of the trophic chain are exacerbated by increased water temperatures. My NSERC-Discovery program involves fundamental and applied research based on mesocosm experiments and field studies. The results will improve our comprehension of threats to biodiversity and ecosystem function by providing a better understanding of how food webs will be impacted by agricultural land use and eutrophication in a warming climate.
农业是加拿大许多流域富营养化的主要因素。因此,对农业的潜在影响进行充分监测对于对淡水资源作出明智的管理决定至关重要。生物评估是一种提供关于有机体对环境压力的反应的信息的方法,从而能够评估人类活动如何影响生物群。到目前为止,对水生生态系统的生物评估通常是基于组合的分类组成的变化。然而,尽管提供了对生态系统健康的可靠估计,但基于分类的指数侧重于单个有机体群体(例如藻类、无脊椎动物),而没有评估整个食物网的影响,而且对在生态系统规模上作用的压力源的影响提供的洞察有限。因此,需要开发结合群落功能和食物网动态的生物监测工具,以反映整个生态系统的生态属性。脂肪酸(FAs)对生物体(如能量、生殖、细胞膜)至关重要。某些必需的脂肪酸从食品来源转移到消费者手中,不需要或只需很少的修改,这对无脊椎动物的生长/繁殖和向更高营养水平的能量转移效率是基本的。因此,溪流生物膜中的FA分布代表了基本资源质量,即食物网底部的营养质量。FA剖面在不同条件下会发生变化,可作为评价富营养化、气候变暖等人为应激源影响的生物标志物。然而,需要新的知识来支持在生物监测中使用脂肪酸,特别是确认这一生物标志物对农业用地富营养化和水温变暖的反应。利用这笔NSERC-Discovery赠款,我将解决五个短期目标:(1)量化生物膜FA在不同磷条件下的时空变异性;(2)量化生物膜FA在不同磷条件下的响应及其与藻类分类组成和基于硅藻的指标值的关系;(3)建立土地利用与生物膜FA之间的关系,以确定变化阈值;(4)确定农业溪流富营养化条件下生物膜FA与主要消费者FA之间的关系;(5)评估富营养化对营养链底部生物膜FA的影响是否因水温上升而加剧。我的NSERC-Discovery计划涉及以中观实验和实地研究为基础的基础和应用研究。这一结果将提高我们对生物多样性和生态系统功能威胁的理解,使我们更好地理解在气候变暖的情况下,农业土地利用和富营养化将如何影响食物网。

项目成果

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Lavoie, Isabelle其他文献

Diatoms and biomonitoring: should cell size be accounted for?
  • DOI:
    10.1007/s10750-006-0223-z
  • 发表时间:
    2006-12-01
  • 期刊:
  • 影响因子:
    2.6
  • 作者:
    Lavoie, Isabelle;Campeau, Stephane;Dillon, Peter J.
  • 通讯作者:
    Dillon, Peter J.
Diatom teratologies as biomarkers of contamination: Are all deformities ecologically meaningful?
  • DOI:
    10.1016/j.ecolind.2017.06.048
  • 发表时间:
    2017-11-01
  • 期刊:
  • 影响因子:
    6.9
  • 作者:
    Lavoie, Isabelle;Hamilton, Paul B.;Taylor, Jonathan C.
  • 通讯作者:
    Taylor, Jonathan C.
A mine of information: Benthic algal communities as biomonitors of metal contamination from abandoned tailings
  • DOI:
    10.1016/j.scitotenv.2012.02.057
  • 发表时间:
    2012-05-15
  • 期刊:
  • 影响因子:
    9.8
  • 作者:
    Lavoie, Isabelle;Lavoie, Michel;Fortin, Claude
  • 通讯作者:
    Fortin, Claude
A preliminary assessment of the effects of Didymosphenia geminata nuisance growths on the structure and diversity of diatom assemblages of the Restigouche River basin, Quebec, Canada
  • DOI:
    10.1080/0269249x.2014.924437
  • 发表时间:
    2014-01-01
  • 期刊:
  • 影响因子:
    1.8
  • 作者:
    Gillis, Carole-Anne;Lavoie, Isabelle
  • 通讯作者:
    Lavoie, Isabelle
Effects of Temperature and Glyphosate on Fatty Acid Composition, Antioxidant Capacity, and Lipid Peroxidation in the Gastropod Lymneae sp.
  • DOI:
    10.3390/w13081039
  • 发表时间:
    2021-04-01
  • 期刊:
  • 影响因子:
    3.4
  • 作者:
    Fadhlaoui, Mariem;Lavoie, Isabelle
  • 通讯作者:
    Lavoie, Isabelle

Lavoie, Isabelle的其他文献

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{{ truncateString('Lavoie, Isabelle', 18)}}的其他基金

Basal food resource quality and trophic energy flow across the biofilm-consumer interface: aquatic ecosystem response to environmental stressors
生物膜-消费者界面的基础食物资源质量和营养能量流:水生生态系统对环境压力的反应
  • 批准号:
    RGPIN-2019-06603
  • 财政年份:
    2022
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Improving management and protection of drinking water supplies and environmental sustainability in urban settings
改善城市环境中饮用水供应的管理和保护以及环境可持续性
  • 批准号:
    530548-2018
  • 财政年份:
    2021
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Collaborative Research and Development Grants
Improving management and protection of drinking water supplies and environmental sustainability in urban settings
改善城市环境中饮用水供应的管理和保护以及环境可持续性
  • 批准号:
    530548-2018
  • 财政年份:
    2020
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Collaborative Research and Development Grants
Basal food resource quality and trophic energy flow across the biofilm-consumer interface: aquatic ecosystem response to environmental stressors
生物膜-消费者界面的基础食物资源质量和营养能量流:水生生态系统对环境压力的反应
  • 批准号:
    RGPIN-2019-06603
  • 财政年份:
    2020
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Basal food resource quality and trophic energy flow across the biofilm-consumer interface: aquatic ecosystem response to environmental stressors
生物膜-消费者界面的基础食物资源质量和营养能量流:水生生态系统对环境压力的反应
  • 批准号:
    DGECR-2019-00240
  • 财政年份:
    2019
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Launch Supplement
Improving management and protection of drinking water supplies and environmental sustainability in urban settings
改善城市环境中饮用水供应的管理和保护以及环境可持续性
  • 批准号:
    530548-2018
  • 财政年份:
    2019
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Collaborative Research and Development Grants
Basal food resource quality and trophic energy flow across the biofilm-consumer interface: aquatic ecosystem response to environmental stressors
生物膜-消费者界面的基础食物资源质量和营养能量流:水生生态系统对环境压力的反应
  • 批准号:
    RGPIN-2019-06603
  • 财政年份:
    2019
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual

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