Nitrogen and phosphorus removal by fishing in a large freshwater lake (Lake Balaton, Hungary)

IF 2.7 3区环境科学与生态学 Q1 LIMNOLOGY

Inland Waters Pub Date : 2022-01-14 DOI:10.1080/20442041.2021.1991754

G. Boros

{"title":"Nitrogen and phosphorus removal by fishing in a large freshwater lake (Lake Balaton, Hungary)","authors":"G. Boros","doi":"10.1080/20442041.2021.1991754","DOIUrl":null,"url":null,"abstract":"ABSTRACT Fish biomass can serve as a large temporary sink of limiting nutrients, and thus fishing may represent an important anthropogenic nutrient efflux from aquatic ecosystems. However, the significance of this type of nutrient removal has rarely been evaluated for freshwater lakes. The aim of this study was to reveal how fishing contributed to the nutrient output from Lake Balaton (Hungary), the largest lake in Central Europe. The results show that net fish removal (the difference between the removed and stocked fish biomass) returned to land on average (standard deviation) 3.1 (0.3) tonnes of phosphorus (P) and 10.2 (1.1) tonnes of nitrogen (N) per year from Lake Balaton between 2017 and 2019, which is equivalent to a removal rate of 0.05 (0) kg ha−1 yr−1 P and 0.17 (0.02) kg ha−1 yr−1 N. These rates corresponded to 7.5% (1.5%) of the annual external P and 1.4% (0.6%) of the annual N loads from the inflowing watercourses. These findings suggest that fish harvest was moderately effective at offsetting external loading during the observed period. To mitigate the ongoing within-lake nutrient accumulation, more intensive selective fishing should be promoted in Lake Balaton, along with reconsideration of regulations on fishing practices.","PeriodicalId":49061,"journal":{"name":"Inland Waters","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2022-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inland Waters","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/20442041.2021.1991754","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: 2

Abstract

ABSTRACT Fish biomass can serve as a large temporary sink of limiting nutrients, and thus fishing may represent an important anthropogenic nutrient efflux from aquatic ecosystems. However, the significance of this type of nutrient removal has rarely been evaluated for freshwater lakes. The aim of this study was to reveal how fishing contributed to the nutrient output from Lake Balaton (Hungary), the largest lake in Central Europe. The results show that net fish removal (the difference between the removed and stocked fish biomass) returned to land on average (standard deviation) 3.1 (0.3) tonnes of phosphorus (P) and 10.2 (1.1) tonnes of nitrogen (N) per year from Lake Balaton between 2017 and 2019, which is equivalent to a removal rate of 0.05 (0) kg ha−1 yr−1 P and 0.17 (0.02) kg ha−1 yr−1 N. These rates corresponded to 7.5% (1.5%) of the annual external P and 1.4% (0.6%) of the annual N loads from the inflowing watercourses. These findings suggest that fish harvest was moderately effective at offsetting external loading during the observed period. To mitigate the ongoing within-lake nutrient accumulation, more intensive selective fishing should be promoted in Lake Balaton, along with reconsideration of regulations on fishing practices.

查看原文本刊更多论文

在一个大型淡水湖(匈牙利巴拉顿湖)捕鱼去除氮和磷

摘要鱼类生物量可以作为限制性营养物质的大型临时汇，因此渔业可能代表着水生生态系统中重要的人为营养物质流出。然而，这种类型的营养物去除的重要性很少被评估为淡水湖。这项研究的目的是揭示捕鱼如何促进中欧最大的湖泊巴拉顿湖（匈牙利）的营养输出。结果表明，净鱼去除量（去除量和放养量之间的差异）平均返回陆地（标准差）3.1 （0.3）吨磷和10.2 2017年至2019年间，巴拉顿湖每年产生1.1吨氮，相当于0.05的去除率 （0）公斤 ha−1 年-1 P和0.17 （0.02）公斤 ha−1 yr−1 N。这些比率相当于流入水道的年外部P的7.5%（1.5%）和年N负荷的1.4%（0.6%）。这些发现表明，在观察期内，鱼类捕捞在抵消外部负荷方面适度有效。为了缓解湖内持续的营养积累，应在巴拉顿湖推广更密集的选择性捕鱼，同时重新考虑捕鱼做法的规定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Inland Waters LIMNOLOGY-MARINE & FRESHWATER BIOLOGY

CiteScore

6.10

自引率

9.70%

发文量

审稿时长

>12 weeks

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.