Assessing the effects of migratory waterbird droppings on potential lake eutrophication using water quality models: A case study of Yangming Lake on Kinmen Island, Taiwan.
{"title":"Assessing the effects of migratory waterbird droppings on potential lake eutrophication using water quality models: A case study of Yangming Lake on Kinmen Island, Taiwan.","authors":"Chi-Feng Chen, Yang-Ming Chen, Jen-Yang Lin","doi":"10.1080/20442041.2023.2218983","DOIUrl":null,"url":null,"abstract":"ABSTRACT Eutrophication in freshwater lakes and reservoirs is a key threat to aquatic ecosystems and water supply systems. In some lakes and reservoirs, waterbirds might be an important nutrient source. The effects of waterbirds on water quality have been studied in temperate regions, but few studies have been conducted in tropical or subtropical regions. This study is the first to demonstrate the effects of migratory birds and cormorants on an Asian subtropical lake, Yangming Lake, Kinmen Island, Taiwan. Water quality model tools were applied with field investigations. During the study period, rainfall was relatively low and water storage was very low, resulting in cormorants contributing a high percentage of the phosphorus (P) loads, ∼70% of the annual external nutrients. However, when simulating normal rainfall records, the simulated total P (TP) concentration decreased, and the waterbirds contributed 55% of the external nutrients. Without the birds, the TP concentration is expected to be <50 μg/L under normal water volume. This study showed that migratory waterbird roosting could bring excess nutrients to the lake and significantly affect the water quality during the migratory period. However, the status of the lake water volume might dilute or strengthen the impacts of waterbirds. The random and nonlinear effects of waterbird droppings can be regarded as nonpoint source pollution, and management strategies are suggested to reduce the transport of waterbird droppings to receiving waterbodies.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inland Waters","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/20442041.2023.2218983","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"LIMNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
ABSTRACT Eutrophication in freshwater lakes and reservoirs is a key threat to aquatic ecosystems and water supply systems. In some lakes and reservoirs, waterbirds might be an important nutrient source. The effects of waterbirds on water quality have been studied in temperate regions, but few studies have been conducted in tropical or subtropical regions. This study is the first to demonstrate the effects of migratory birds and cormorants on an Asian subtropical lake, Yangming Lake, Kinmen Island, Taiwan. Water quality model tools were applied with field investigations. During the study period, rainfall was relatively low and water storage was very low, resulting in cormorants contributing a high percentage of the phosphorus (P) loads, ∼70% of the annual external nutrients. However, when simulating normal rainfall records, the simulated total P (TP) concentration decreased, and the waterbirds contributed 55% of the external nutrients. Without the birds, the TP concentration is expected to be <50 μg/L under normal water volume. This study showed that migratory waterbird roosting could bring excess nutrients to the lake and significantly affect the water quality during the migratory period. However, the status of the lake water volume might dilute or strengthen the impacts of waterbirds. The random and nonlinear effects of waterbird droppings can be regarded as nonpoint source pollution, and management strategies are suggested to reduce the transport of waterbird droppings to receiving waterbodies.
期刊介绍:
Inland Waters is the peer-reviewed, scholarly outlet for original papers that advance science within the framework of the International Society of Limnology (SIL). The journal promotes understanding of inland aquatic ecosystems and their management. Subject matter parallels the content of SIL Congresses, and submissions based on presentations are encouraged.
All aspects of physical, chemical, and biological limnology are appropriate, as are papers on applied and regional limnology. The journal also aims to publish articles resulting from plenary lectures presented at SIL Congresses and occasional synthesis articles, as well as issues dedicated to a particular theme, specific water body, or aquatic ecosystem in a geographical area. Publication in the journal is not restricted to SIL members.