Ecological Drivers of Freshwater Macroalgal Blooms across Trophic Gradients
淡水巨藻在营养梯度上大量繁殖的生态驱动因素
基本信息
- 批准号:RGPIN-2018-05443
- 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:2018
- 资助国家:加拿大
- 起止时间:2018-01-01 至 2019-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The incidence of freshwater algal blooms has been increasing across North America, including regions with no historical record of bloom occurrence. This is a disconcerting trend when considering the negative social and economic impacts of algal blooms. Eutrophication and climate change have been implicated as major drivers of microalgal (i.e., phytoplankton) blooms. In contrast, macroalgal (i.e., visible mat-forming algae) blooms are not consistently explained by nutrients, nor is much known about the role of climate change. Morphologically diverse species of macroalgae bloom across a range of habitats and nutrient conditions (i.e., trophic states), even in systems where nutrients are low. This “nutrient-biomass” paradox may be explained by the shared characteristics of freshwater macroalgae: (1) a colony-matrix; and (2) a benthic or near-bed habitat. One possible driver of macroalgal blooms across trophic gradients involves the microbial community that lives on/within the colony-matrix (i.e., the “epibiome”), which may facilitate or supplement growth when external nutrients are variable or low. Another possible ecological driver is nutrient bioavailability in the benthic zone, whereby blooming species can exploit alternative forms of nutrients (e.g., dissolved organic phosphorus) compared to competing organisms. A likely over-arching driver of macroalgal blooms is climate change, which can either directly or indirectly influence bloom development irrespective of trophic state. As such, there are three main research objectives for this proposed program of study: (1) Determine how climate change directly/indirectly influences macroalgal blooms; (2) Assess the role of organic nutrient supply in macroalgal bloom development; and (3) Evaluate the role of the epibiome in facilitating growth in bloom-forming macroalgae. Three diverse, but representative macroalgal species (Didymosphenia geminata, Nitellopsis obtusa and Cladophora glomerata) with documented nuisance growth in systems representing a broad trophic gradient will be the main study taxa. Overall, this proposed research program will offer new insight on causes of nuisance macroalgal growth, including similarities and differences across taxa and ecosystems. It is anticipated that this information will prove useful to water managers from various levels of government seeking to control nuisance macroalgae outbreaks in their jurisdictions.
整个北美地区淡水藻类水华的发生率一直在增加,包括历史上没有水华发生记录的地区。考虑到藻类水华对社会和经济的负面影响,这是一个令人不安的趋势。富营养化和气候变化被认为是微藻(即浮游植物)水华的主要驱动因素。相比之下,大型藻类(即可见的垫状藻类)水华的营养解释并不一致,对气候变化的作用也知之甚少。形态多样的大型藻类在一系列生境和营养条件(即营养状态)中繁殖,即使在营养较低的系统中也是如此。这种“营养-生物量”悖论可以用淡水大型藻类的共同特征来解释:(1)群体基质;(2)底栖或近床栖息地。跨营养梯度的大型藻类水华的一个可能驱动因素涉及生活在菌落基质(即“表观生物群”)上/内的微生物群落,当外部营养物质可变或低时,微生物群落可促进或补充生长。另一个可能的生态驱动因素是底栖区的营养生物可用性,与竞争生物相比,水华物种可以利用替代形式的营养(例如溶解的有机磷)。大型藻类水华的一个可能的主要驱动因素是气候变化,它可以直接或间接地影响水华的发展,而与营养状态无关。因此,这项拟议的研究计划有三个主要研究目标:(1)确定气候变化如何直接/间接影响大型藻类水华;(2)评估有机营养供应在大型藻类水华发展中的作用;(3)评估表观生物群在促进水华形成的大型藻类生长方面的作用。三种不同但有代表性的大型藻类(Didymphenia gminata、Nitellopsis obtusa和Cladadhora regatata)将是主要的研究类群,它们在代表广泛营养梯度的系统中有记录地滋扰生长。总体而言,这项拟议的研究计划将对滋扰大型藻类生长的原因提供新的见解,包括不同类群和生态系统的相似和差异。预计这些信息将有助于各级政府的水资源管理人员在其管辖范围内控制滋扰的大型藻类暴发。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Kirkwood, Andrea其他文献
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{{ truncateString('Kirkwood, Andrea', 18)}}的其他基金
Ecological Drivers of Freshwater Macroalgal Blooms across Trophic Gradients
淡水巨藻在营养梯度上大量繁殖的生态驱动因素
- 批准号:
RGPIN-2018-05443 - 财政年份:2022
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
Ecological Drivers of Freshwater Macroalgal Blooms across Trophic Gradients
淡水巨藻在营养梯度上大量繁殖的生态驱动因素
- 批准号:
RGPIN-2018-05443 - 财政年份:2021
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
Ecological Drivers of Freshwater Macroalgal Blooms across Trophic Gradients
淡水巨藻在营养梯度上大量繁殖的生态驱动因素
- 批准号:
RGPIN-2018-05443 - 财政年份:2020
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
Ecological Drivers of Freshwater Macroalgal Blooms across Trophic Gradients
淡水巨藻在营养梯度上大量繁殖的生态驱动因素
- 批准号:
RGPIN-2018-05443 - 财政年份:2019
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
The role of algal-bacterial interactions in aquatic ecosystem function
藻类-细菌相互作用在水生生态系统功能中的作用
- 批准号:
371515-2009 - 财政年份:2015
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
The role of algal-bacterial interactions in aquatic ecosystem function
藻类-细菌相互作用在水生生态系统功能中的作用
- 批准号:
371515-2009 - 财政年份:2014
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
The role of algal-bacterial interactions in aquatic ecosystem function
藻类-细菌相互作用在水生生态系统功能中的作用
- 批准号:
371515-2009 - 财政年份:2013
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
The role of algal-bacterial interactions in aquatic ecosystem function
藻类-细菌相互作用在水生生态系统功能中的作用
- 批准号:
371515-2009 - 财政年份:2012
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
The role of algal-bacterial interactions in aquatic ecosystem function
藻类-细菌相互作用在水生生态系统功能中的作用
- 批准号:
371515-2009 - 财政年份:2011
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
The role of algal-bacterial interactions in aquatic ecosystem function
藻类-细菌相互作用在水生生态系统功能中的作用
- 批准号:
371515-2009 - 财政年份:2010
- 资助金额:
$ 2.04万 - 项目类别:
Discovery Grants Program - Individual
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