Influence of cultural eutrophication, climate, and landscape connectivity on 3 Kawartha lakes (Ontario, Canada) since the early 1800s

IF 1.1 4区环境科学与生态学 Q4 LIMNOLOGY

Lake and Reservoir Management Pub Date : 2023-04-03 DOI:10.1080/10402381.2023.2204061

K. Laird, Shirui Li, Cale A. C. Gushulak, K. Moir, Yuxiang S. Wang, P. Leavitt, B. Cumming

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Abstract

Abstract Laird KR, Li S, Gushulak CAC, Moir KE, Wang Y, Leavitt PR, Cumming BF. 2023. Influence of cultural eutrophication, climate, and landscape connectivity on 3 Kawartha lakes (Ontario, Canada) since the early 1800s . Lake Reserv Manage. 39:120–140. Paleolimnological analyses of 3 lakes within the Trent-Severn Waterway (TSW) were examined to evaluate the role of regional land-use practices (forestry and agriculture), climate change, and landscape position on cultural eutrophication and lake response over the past ∼200 yr. The lakes were selected to represent lake position along the chain of lakes of the TSW; these 3 lakes vary in lake-water conditions from a lower nutrient headwater lake (Cameron Lake) to more nutrient-rich sites (Pigeon and Stony lakes) downstream. Diatom-inferred total phosphorus (TP) concentrations estimate that all lakes had TP levels of ∼15 µg/L in the 1700s, which increased to ∼20–30 µg/L in the 1800s and 1900s. Significant changes in diatom and Cladocera assemblages circa the 1830s are consistent with increased water levels and elevated phosphorus conditions associated with the intensification of forest harvest, agriculture, and development of the TSW. Diatom-inferred TP levels varied among lakes since the early 1900s, declining in Cameron Lake, increasing in Pigeon Lake, and stabilizing in Stony Lake, reflective of landscape position, degree of water inflow from the northern forested regions, and responsiveness of basins to point-source nutrient reductions and climate change. Timing of changes in TP, and changes in planktonic community composition varied among lakes. Lake production (as pigments) increased coherently in 2 lakes over the past ∼20 yr, and modern algal composition (diatoms and pigments) are lake specific and unique in comparison to the last ∼200 yr, likely reflecting combined effects of climate change and changes in nutrient loading.

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19世纪初以来文化富营养化、气候和景观连通性对3个卡瓦塔湖(加拿大安大略省)的影响

Laird KR, Li S, Gushulak CAC, Moir KE, Wang Y, Leavitt PR, Cumming BF。2023. 19世纪初以来文化富营养化、气候和景观连通性对3个卡瓦塔湖(加拿大安大略省)的影响湖泊保护区管理。39:120-140。对特伦特-塞文水道(TSW)内3个湖泊的古湖泊学分析进行了研究，以评估过去~ 200年来区域土地利用实践(林业和农业)、气候变化和景观位置对文化富营养化和湖泊响应的作用。选择的湖泊代表了天水峡湖链上的湖泊位置;这3个湖泊的湖水条件各不相同，从营养较低的源头湖(卡梅隆湖)到营养较丰富的下游湖(鸽湖和石湖)。据硅藻推断的总磷(TP)浓度估计，在18世纪，所有湖泊的TP水平为~ 15 μ g/L，在19世纪和20世纪增加到~ 20-30 μ g/L。19世纪30年代前后，硅藻和枝角藻组合的显著变化与森林采伐、农业和TSW开发的集约化相关的水位增加和磷含量升高的条件是一致的。20世纪初以来，各湖泊的总磷水平呈现出不同的变化趋势，卡梅隆湖呈下降趋势，鸽湖呈上升趋势，石湖呈稳定趋势，反映了景观位置、北部林区来水流入程度以及流域对点源营养物减少和气候变化的响应。湖泊总磷变化的时间和浮游生物群落组成的变化存在差异。在过去~ 20年中，2个湖泊的湖泊产量(作为色素)一致增加，与过去~ 200年相比，现代藻类组成(硅藻和色素)具有湖泊特异性和独特性，可能反映了气候变化和营养负荷变化的综合影响。

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来源期刊

Lake and Reservoir Management 环境科学-海洋与淡水生物学

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6.70%

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期刊介绍： Lake and Reservoir Management (LRM) publishes original, previously unpublished studies relevant to lake and reservoir management. Papers address the management of lakes and reservoirs, their watersheds and tributaries, along with the limnology and ecology needed for sound management of these systems. Case studies that advance the science of lake management or confirm important management concepts are appropriate as long as there is clearly described management significance. Papers on economic, social, regulatory and policy aspects of lake management are also welcome with appropriate supporting data and management implications. Literature syntheses and papers developing a conceptual foundation of lake and watershed ecology will be considered for publication, but there needs to be clear emphasis on management implications. Modeling papers will be considered where the model is properly verified but it is also highly preferable that management based on the model has been taken and results have been documented. Application of known models to yet another system without a clear advance in resultant management are unlikely to be accepted. Shorter notes that convey important early results of long-term studies or provide data relating to causative agents or management approaches that warrant further study are acceptable even if the story is not yet complete. All submissions are subject to peer review to assure relevance and reliability for management application.