The Effects of Limiting Restoration Treatments in a Shallow Urban Lake
Swarzędzkie Lake, directly polluted for many years with municipal wastewater and heavily loaded with nutrient compounds from the catchment area, has become degraded and strongly eutrophicated. Strong cyanobacterial blooms have contributed, among others, to the cessation of recreational use of this u...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2020-05-01
|
Series: | Water |
Subjects: | |
Online Access: | https://www.mdpi.com/2073-4441/12/5/1383 |
id |
doaj-e7217f8016c24ede98e39f99a436f16c |
---|---|
record_format |
Article |
spelling |
doaj-e7217f8016c24ede98e39f99a436f16c2020-11-25T03:28:16ZengMDPI AGWater2073-44412020-05-01121383138310.3390/w12051383The Effects of Limiting Restoration Treatments in a Shallow Urban LakeKatarzyna Kowalczewska-Madura0Joanna Rosińska1Renata Dondajewska-Pielka2Ryszard Gołdyn3Lech Kaczmarek4Department of Water Protection, Faculty of Biology, Adam Mickiewicz University, UniwersytetuPoznańskiego 6, 61-614 Poznań, PolandDepartment of Environmental Medicine, Poznań University of Medical Sciences, Rokietnicka 8, 60-806 Poznań, PolandDepartment of Water Protection, Faculty of Biology, Adam Mickiewicz University, UniwersytetuPoznańskiego 6, 61-614 Poznań, PolandDepartment of Water Protection, Faculty of Biology, Adam Mickiewicz University, UniwersytetuPoznańskiego 6, 61-614 Poznań, PolandJeziory Ecological Station, Adam Mickiewicz University, P.O.Box 40, 62-050 Mosina, PolandSwarzędzkie Lake, directly polluted for many years with municipal wastewater and heavily loaded with nutrient compounds from the catchment area, has become degraded and strongly eutrophicated. Strong cyanobacterial blooms have contributed, among others, to the cessation of recreational use of this urban lake. Its sustainable restoration was started in autumn 2011. These treatments were a combination of three complementary methods: aeration with a pulverizing aerator, phosphorus inactivation with small doses of magnesium chloride and iron sulphate (<15 kg ha<sup>−1</sup>) and biomanipulation. These treatments were carried out for three years (2012–2014), and in the next two (2015–2016), treatments were limited from three to one method—aeration. The obtained effects (a decrease in the number of cyanobacteria in phytoplankton and at the same time an increase in its biodiversity, decrease in chlorophyll<i>a</i> concentration and improvement of transparency) were lost due to the cessation of phosphorus inactivation and biomanipulation. The biological balance was upset, which resulted in an increase in chlorophyll<i>a</i> concentration, the return of cyanobacteria dominance in the phytoplankton and a deterioration of water quality. Leaving only a pulverizing aerator active, to maintain low oxygen concentrations near the bottom zone was not sufficient to ensure a gradual improvement of water quality with quite a significant external load of nutrients.https://www.mdpi.com/2073-4441/12/5/1383lakesustainable restorationphosphorusnitrogenchlorophyll alimited restoration |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Katarzyna Kowalczewska-Madura Joanna Rosińska Renata Dondajewska-Pielka Ryszard Gołdyn Lech Kaczmarek |
spellingShingle |
Katarzyna Kowalczewska-Madura Joanna Rosińska Renata Dondajewska-Pielka Ryszard Gołdyn Lech Kaczmarek The Effects of Limiting Restoration Treatments in a Shallow Urban Lake Water lake sustainable restoration phosphorus nitrogen chlorophyll a limited restoration |
author_facet |
Katarzyna Kowalczewska-Madura Joanna Rosińska Renata Dondajewska-Pielka Ryszard Gołdyn Lech Kaczmarek |
author_sort |
Katarzyna Kowalczewska-Madura |
title |
The Effects of Limiting Restoration Treatments in a Shallow Urban Lake |
title_short |
The Effects of Limiting Restoration Treatments in a Shallow Urban Lake |
title_full |
The Effects of Limiting Restoration Treatments in a Shallow Urban Lake |
title_fullStr |
The Effects of Limiting Restoration Treatments in a Shallow Urban Lake |
title_full_unstemmed |
The Effects of Limiting Restoration Treatments in a Shallow Urban Lake |
title_sort |
effects of limiting restoration treatments in a shallow urban lake |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2020-05-01 |
description |
Swarzędzkie Lake, directly polluted for many years with municipal wastewater and heavily loaded with nutrient compounds from the catchment area, has become degraded and strongly eutrophicated. Strong cyanobacterial blooms have contributed, among others, to the cessation of recreational use of this urban lake. Its sustainable restoration was started in autumn 2011. These treatments were a combination of three complementary methods: aeration with a pulverizing aerator, phosphorus inactivation with small doses of magnesium chloride and iron sulphate (<15 kg ha<sup>−1</sup>) and biomanipulation. These treatments were carried out for three years (2012–2014), and in the next two (2015–2016), treatments were limited from three to one method—aeration. The obtained effects (a decrease in the number of cyanobacteria in phytoplankton and at the same time an increase in its biodiversity, decrease in chlorophyll<i>a</i> concentration and improvement of transparency) were lost due to the cessation of phosphorus inactivation and biomanipulation. The biological balance was upset, which resulted in an increase in chlorophyll<i>a</i> concentration, the return of cyanobacteria dominance in the phytoplankton and a deterioration of water quality. Leaving only a pulverizing aerator active, to maintain low oxygen concentrations near the bottom zone was not sufficient to ensure a gradual improvement of water quality with quite a significant external load of nutrients. |
topic |
lake sustainable restoration phosphorus nitrogen chlorophyll a limited restoration |
url |
https://www.mdpi.com/2073-4441/12/5/1383 |
work_keys_str_mv |
AT katarzynakowalczewskamadura theeffectsoflimitingrestorationtreatmentsinashallowurbanlake AT joannarosinska theeffectsoflimitingrestorationtreatmentsinashallowurbanlake AT renatadondajewskapielka theeffectsoflimitingrestorationtreatmentsinashallowurbanlake AT ryszardgołdyn theeffectsoflimitingrestorationtreatmentsinashallowurbanlake AT lechkaczmarek theeffectsoflimitingrestorationtreatmentsinashallowurbanlake AT katarzynakowalczewskamadura effectsoflimitingrestorationtreatmentsinashallowurbanlake AT joannarosinska effectsoflimitingrestorationtreatmentsinashallowurbanlake AT renatadondajewskapielka effectsoflimitingrestorationtreatmentsinashallowurbanlake AT ryszardgołdyn effectsoflimitingrestorationtreatmentsinashallowurbanlake AT lechkaczmarek effectsoflimitingrestorationtreatmentsinashallowurbanlake |
_version_ |
1724585385970892800 |