Assessing the impacts of aquaculture and pesticide use in a protected tropical wetland(Loktak Lake, India)

评估受保护的热带湿地（印度洛克塔克湖）中水产养殖和农药使用的影响

• 批准号: 2746417
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2746417
• 关键词: Assessing; impacts; aquaculture; pesticide; use

Loktak Lake, located in Manipur, is the largest freshwater lake in NE India, declared a Ramsar site in 1990. It is divided into three main basins which have different land use practices by local populations, with the southern being in the Keibul Lamjao National Park. This National Park is also the last natural habitat of the Manipur Brow deer (Rucervus eldii eldii). In recent decades this pristine environment has been placed under increasing pressures from aquaculture expansion, land use alteration and deforestation, rapidly increasing pesticide use, upstream pollution from conurbations, and climate change. This has resulted in drastic water quality deterioration and water level fluctuations (further complicated by the construction of the Ithai dam in 1993 which has prompted increased sediment retention). While toxic bioaccumulation due to pervasive pesticide use has impactedthe natural food web structure prompting serious concerns to human health.Via the collection and dating (210Pb, 137Cs) of lake sediment cores (n=3) from three different land use regions of Loktak Lake this project will quantify changes in sedimentary organic content, aquatic ecology and pesticide accumulation rates since the initiation of human impacts upon the lake. The concentration and identification of pesticides will be established over time, along with the concentrations of algal pigmentsand stable isotopes (13C, 15N, C/N ratios) to determine the impact of aquaculture, pesticide use and climate change upon the lake.The aims of this project are to:1.Reconstruct (the past c. 300 years) the initiation of aquacultural practices across the three basins of Loktak Lake and identify the impacts this has had on aquatic ecology 2.Reconstruct the initiation of pesticide use across the three basins of Loktak Lake across and identify and quantify the key chemicals used3.Quantify changes in lake sediment retention and organic carbon burial since the formation of the Ithai damThe student will work between the National Environmental Isotope Facility at the British Geological Survey and the School of Geography at the University of Nottingham, being embedded within a team of isotope geoscientists and palaeolimnologists. This project is in receipt of additional funding from the BGS University Funding Initiative.

位于曼尼普尔邦的洛克塔克湖是印度东北部最大的淡水湖，于1990年被宣布为拉姆萨尔湿地。它被分为三个主要盆地，当地人口有不同的土地使用方式，南部是在Keibul Lamjao国家公园。这个国家公园也是曼尼普尔眉鹿（Rucervus eldii eldii）最后的自然栖息地。近几十年来，由于水产养殖扩张、土地利用改变和森林砍伐、农药使用迅速增加、城市上游污染以及气候变化，这一原始环境面临越来越大的压力。这导致水质急剧恶化和水位波动（1993年伊塔伊大坝的修建使情况更加复杂，泥沙滞留量增加）。由于农药的广泛使用，有毒的生物积累已经影响了天然食物网的结构，引起了对人类健康的严重关注。本项目通过对洛克塔克湖三个不同土地利用区的湖泊沉积物岩心（n=3）进行采集和测年（210Pb, 137Cs），量化自人类对湖泊影响开始以来沉积物有机含量、水生生态和农药积累速率的变化。随着时间的推移，将建立农药的浓度和鉴定，以及藻类色素和稳定同位素（13C, 15N， C/N比率）的浓度，以确定水产养殖，农药使用和气候变化对湖泊的影响。这个项目的目的是：1。重建（过去约300年）洛克塔克湖三个流域开始的水产养殖活动，并确定这对水生生态的影响2。重建洛克塔克湖三个流域农药使用的初始阶段，并确定和量化使用的关键化学品3。该学生将在英国地质调查局的国家环境同位素设施和诺丁汉大学地理学院之间工作，加入一个由同位素地球科学家和古湖泊学家组成的团队。该项目得到了英国地质调查局大学资助计划的额外资助。