Understanding the effects of terrestrially-derived dissolved organic matter on food web productivity and organismal life histories in lakes

了解陆地来源的溶解有机物对湖泊食物网生产力和生物生命史的影响

• 批准号: RGPIN-2016-05127
• 负责人: Solomon, Christopher
• 金额: $ 2.19万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=615515
• 关键词: Understanding; effects; terrestrially; derived; dissolved

Lake ecosystems and the services that they provide to people are profoundly influenced by inputs of terrestrially-derived dissolved organic matter (tDOM). Inputs of tDOM to lakes vary across the landscape; they have also increased over the past several decades in many regions, and are likely to continue to change. Given these two observations - that tDOM inputs fundamentally shape lake ecosystems, and that these inputs vary in space and time - what are the implications for the productivity of these systems and the culturally and economically valuable fisheries that they support? We will address this question from two different perspectives. First, we will test a new theoretical framework describing the effects of tDOM on food web productivity. Our tests will include replicated experiments, comparative studies, and a whole-lake tDOM manipulation, in which we will assess how productivity of algae, invertebrates, and fishes respond to differences in tDOM inputs. Second, we will ask how differences in tDOM inputs affect the life histories (e.g. growth rates, maturation ages, and fecundities) of two different organisms, bluegill sunfish and non-biting midges. These are widespread and well-understood species, and so are good model systems for understanding how tDOM influences optimal life history traits. This work will have major benefits for the research field and for Canada. It will provide rigorous tests of cutting-edge theory in aquatic ecosystem ecology, increasing our understanding of how these systems work and how they may respond to ongoing environmental changes. It will inform current and future management of inland recreational fisheries, which are a valuable cultural and economic resource for Canadians.

湖泊生态系统及其为人类提供的服务深受陆地来源溶解有机物 (tDOM) 输入的影响。 tDOM 对湖泊的输入因景观而异；过去几十年来，许多地区的此类风险也有所增加，并且可能会继续发生变化。鉴于这两个观察结果 - tDOM 输入从根本上塑造了湖泊生态系统，并且这些输入在空间和时间上有所不同 - 对这些系统的生产力及其支持的具有文化和经济价值的渔业有何影响？ 我们将从两个不同的角度来解答这个问题。首先，我们将测试一个新的理论框架，描述 tDOM 对食物网生产力的影响。我们的测试将包括重复实验、比较研究和全湖 tDOM 操作，其中我们将评估藻类、无脊椎动物和鱼类的生产力如何响应 tDOM 输入的差异。其次，我们将询问 tDOM 输入的差异如何影响两种不同生物（翻车鱼和非咬蠓）的生命史（例如生长速率、成熟年龄和繁殖力）。这些是广泛分布且易于理解的物种，因此是了解 tDOM 如何影响最佳生活史特征的良好模型系统。 这项工作将为研究领域和加拿大带来重大好处。它将对水生生态系统的前沿理论进行严格的测试，加深我们对这些系统如何工作以及它们如何应对持续的环境变化的理解。它将为内陆休闲渔业当前和未来的管理提供信息，内陆休闲渔业对加拿大人来说是宝贵的文化和经济资源。