Juta Haberman

Juta Haberman
Estonian University of Life Sciences | EMU · Institute of Agricultural and Environmental Sciences

About

57
Publications
17,780
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,423
Citations
Citations since 2017
16 Research Items
937 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150

Publications

Publications (57)
Presentation
Full-text available
We aimed to investigate the influence of environmental factors on zooplankton biomass and abundance in Lake Peipsi and Lake Võrtsjärv, two large, shallow eutrophic lakes in Estonia. We employed time series of zooplankton and environmental parameters that were measured monthly to build estimates of zooplankton community metrics (biomass, abundance)....
Article
Full-text available
We assessed long-term impacts of multiple stressors and their interaction on the zooplankton community of the large, eutrophic, cyanobacteria-dominated Lake Peipsi (Estonia, Russia). Stressor dataset consisted in time series (1997–2018) of temperature, nutrients, pH, water transparency, phytoplankton biomass and taxonomic richness. The best predict...
Article
Relationships between biomass and ecological factors including trophic interactions were examined to understand the dynamics of six fish species in Lake Võrtsjärv, a large shallow eutrophic lake located in Estonia (north-eastern Europe). The database contained initially 31 predictive variables that were monitored in situ for nearly forty years. The...
Article
Full-text available
We aimed to investigate the influence of environmental factors and predict zooplankton biomass and abundance in shallow eutrophic lakes. We employed time series of zooplankton and environmental parameters that were measured monthly during 38 years in a large, shallow eutrophic lake in Estonia to build estimates of zooplankton community metrics (cla...
Article
Full-text available
Climate change in recent decades has been identified as a significant threat to natural environments and human wellbeing. This is because some of the contemporary changes to climate are abrupt and result in persistent changes in the state of natural systems; so called regime shifts (RS). This study aimed to detect and analyse the timing and strengt...
Data
List of used time series, their original temporal resolution and spatial extent. Below potted history for each variable with identified regime shifts as broken lines. Number at the broken line reflects the statistical significance of the particular regime shift. (PDF)
Data
A R script on how to depict a timing and relative strength of statistically significant RSs and the relatedness of time series within each system category (i.e. abiotic and biotic elements of atmospheric, terrestrial, bog, lake, river and marine systems) in terms of the timing of RSs. (PDF)
Article
In recent decades, a marked decrease in planktivorous fish (Osmerus eperlanus eperlanus m. spirinchus Pallas and Coregonus albula (L.)) in Lake Peipsi has stimulated research into the potential effect of fish predation on zooplankton. The abundance of planktivorous fish and the abundance and biomass of zooplankton were studied from 1986 to 2014, an...
Article
Full-text available
We modeled energy transfer and trophic position of fish, plankton, and macroinvertebrates and the relative importance of top-down versus bottom-up processes in Lake Võrtsjärv, a large shallow eutrophic lake in Estonia (northeastern Europe). We employed input values based on 37 years of biomass and fishing activity monitoring for calibrating the Eco...
Article
We aimed at quantifying the importance of limnological variables in the decadal rise of cyanobacteria biomass in shallow hemiboreal lakes. We constructed estimates of cyanobacteria (blue-green algae) biomass in a large, eutrophic lake (Estonia, Northeastern Europe) from a database comprising 28 limnological variables and spanning more than 50 years...
Article
Full-text available
p>Through cascading effects within lake food webs, commercial and recreational fisheries may indirectly affect the abundances of organisms at lower trophic levels, such as phytoplankton, even if they are not directly consumed. So far, interactive effects of fisheries, changing trophic state and climate upon lake ecosystems have been largely overloo...
Technical Report
Full-text available
In the previous report (D4.1, September 2016) we have developed predictive linkages between indicators of environmental quality and ecosystem services, and different types of pressures, single or multiple, across river basins from all over Europe, in a latitudinal and a west-east gradient, and having very different conditions of climate and land us...
Article
Full-text available
Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer 'growing seasons'. We executed the first global quantitative synthesis on under-ice lake ecology, including...
Article
Full-text available
Lake Peipsi sensu lato consists of limnologically and hydrochemically different parts, Lake Peipsi sensu stricto, Lake Lämmijärv, and Lake Pihkva. The eutrophic L. Peipsi s.s. and the hypertrophic Lake Pihkva were studied. The aim was to find out if the ecological state of these lake parts has improved, stabilized or deteriorated during a ten-year...
Article
Full-text available
Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer ‘growing seasons’. We executed the first global quantitative synthesis on under-ice lake ecology, including...
Article
Full-text available
We singled out spring (season with a water temperature of 4–15 °C) and autumn (15–4 °C), i.e. the seasons with the most variable meteorological conditions, in order to study the development of zooplankton as well as concurrent meteorological conditions (air and water temperature, ice conditions) and their relationships in these seasons. The aims of...
Article
Full-text available
Efficient zooplankton grazing is a prerequisite for establishing a cascading food web control over phytoplankton in a lake. We studied if the top-down impact of fish could reach phytoplankton in a lake where the grazing pressure of small-sized zooplankton on filamentous phytoplankton is considered weak. We analysed >30 years of data on plankton, fi...
Technical Report
Part 1: This deliverable consists two manuscripts (MS) of lake time-series analysis in north-temperate region of Europe. 1st MS: ‘Is fish able to regulate filamentous blue-green dominated phytoplankton?’ submitted to ‘Hydrobiologia’, analyzes >40-year data on biota, fish catches, hydrochemistry, hydrology, and meteorological parameters in Lake Võrt...
Technical Report
Part 1: This deliverable consists two manuscripts (MS) of lake time-series analysis in north-temperate region of Europe. 1st MS ‘Is fish able to regulate filamentous blue-green dominated phytoplankton?’ submitted to ‘Hydrobiologia’, analyzes >40-year data on biota, fish catches, hydrochemistry, hydrology, and meteorological parameters in Lake Võrts...
Article
Full-text available
On the basis of long-term (1964-2011) research, we tested the hypothesis that the zooplankton community has a highly indicative value in assessing the ecosystem and trophic state of water bodies. Basing on the results of our study and taking into account relevant data from numerous zooplankton studies, we can conclude that the zooplankton measures...
Article
Large Lake Peipsi (3555 km2) is divided between two countries, Estonia (44%) and Russia (56%). The southernmost part of the lake, Lake Pihkva, is almost entirely (99%) in Russia, and is continuously being polluted by the greatest inflow to Lake Peipsi, the insufficiently purified River Velikaya. Research on this lake (Lake Peipsi) in the growing se...
Article
Full-text available
With the implementation of the EU Water Framework Directive (WFD), the member states have to classify the ecological status of surface waters following standardised procedures. It was a matter of some surprise to lake ecologists that zooplankton were not included as a biological quality element (BQE) despite their being considered to be an importan...
Article
Full-text available
The material of the present study was collected from the pelagial of L. Peipsi (Estonia/Russia) mainly during the vegetation periods of 1997–2008. The zooplankton : phytoplankton biomass ratio (B Zp /B Phyt) was followed in different lake parts: the northern eutrophic L. Peipsi s.s. and the southern hypertrophic L. Pihkva (together with L. Lämmijär...
Article
Full-text available
The influence of two winter periods with a different duration of the ice cover on Lake Peipsi (Estonia) on plankton and nutrient content was analysed. The winters of 2005 and 2006 were cold with ice duration of 140 days, whereas the winters of 2007 and 2008 were mild with about 50 and 15 days of ice duration, respectively. Total phosphorus (TP) con...
Article
Full-text available
The large and shallow low-land lakes constitute a distinctive type of lake ecosystem, because of their polymixis, frequent resuspension of bottom sediments and internal nutrient loading, high turbidity and usually high productivity and eutrophication rate. Lake Peipsi is one of the largest lake in Europe, its area is 3555 km 2 and mean depth is 7.1...
Article
Full-text available
In the eutrophic Lake Võrtsjärv (Central Estonia, area 270km2, mean depth 2.8m) rotifers form ca. 90% of total abundance and 80% of biomass in winter zooplankton community. The winter rotifer assemblage was dominated by Polyarthra dolichoptera, both in abundance and in biomass. Synchaeta verrucosa and Keratella quadrata were the sub-dominants. Thus...
Article
Full-text available
During the study period 1997–2007, the duration of the ice cover of Lake Peipsi, the largest freshwater lake in Estonia, was variable. The ice-break took place in mid-April instead of generally in May. Compared with data from 1960s onwards, a trend of shortening of the duration of ice-cover period is evident. In under-ice phytoplankton, diatoms, cr...
Article
The abundance and biomass of ciliates, rotifers, cladocerans and copepods were studied in Lake Peipsi and Lake Võrtsjärv, both of which are shallow, turbid and large. Our hypothesis was that in a large shallow eutrophic lake, the ciliates could be the most important zooplankton group. The mean metazooplankton biomass was higher in Peipsi than in Võ...
Article
Full-text available
The feeding of 0+ smelt (Osmerus eperlanus) was studied in Lake Peipsi (Estonia/Russia). Smelt fed mainly on zooplankton, especially on cladocerans and copepods, and not on rotifers. The dominant taxa in smelt food were Daphnia sp., Bosmina longirostris, Bosmina coregoni, Chydorus sphaericus, Eudiaptomus sp., Mesocyclops spp., and cyclopoid copepod...
Article
Full-text available
The role of pelagic cladoceran communities is discussed on the basis of a comparative study conducted in two Estonian lakes, the moderately eutrophic Lake Peipsi (Ntot 700, Ptot 40 μg l−1 as average of ice-free period of 1997–2003) and in a strongly eutrophic Lake Võrtsjärv (Ntot 1600, Ptot 54 μg l−1). The cladoceran community was found to reflect...
Chapter
Full-text available
The grazing impact of different sized Zooplankton on ‘edible’ and total phytoplankton biomass and primary production was measured in L. Võrtsjärv during a seasonal study in 1998 and 2000. The organisms of 48-100 μm size class, composed of ciliates and rotifers, contributed significantly to the total grazing of zooplankton community throughout the s...
Article
Full-text available
The data for the vegetation periods (May–November) of 1997–2005 were used to analyse the dynamics of zooplankton and the most important phytoplankton groups in Lake Peipsi (Estonia). With some fluctuations, a continuous decline appeared in zooplankton abundance and biomass in those years. Since 1997 the share of cyanobacteria in phytoplankton bioma...
Article
Full-text available
Mean zooplankter weight (W Zp) and the ratio of zooplankton to phytoplankton biomass (BZp/BPhyt) reflect adequately the trophic state of a body of water; they decrease with increasing trophy. In the moderately trophic Lake Peipsi, W Zp is 4.4g and in the strongly eutrophic Lake Vrtsjrv, 2.7g, while B Zp/B Phyt is 0.49 and 0.13, respectively. Mean c...
Article
Full-text available
In the 1990s, as a consequence of a decline in agricultural production in the watershed and a decrease in the amount of waste water discharged into rivers, the nutrient load carried from the catchment area into large, shallow, eutrophic Lake Peipsi (area 3,555 km 2 ) decreased. The aim of the present study was to analyze the in-lake response of key...
Article
The mean zooplankter weight is largely shaped by the trophic state of the water body. At the same time, it reflects even relatively slight differences in the trophy of lakes. In moderately eutrophic Lake Peipsi the mean zooplankter weight is 4.4 µg and in strongly eutrophic Lake Võrtsjärv, 2.7 µg. The mean cladoceran weight is 28 and 10 µg, the mea...
Article
Full-text available
The investigations of the biota in L. Peipsi, one of the largest lakes of Europe, started already one and a half centuries ago, complex studies were initiated in the 1930s. The paper gives a brief survey of research into the hydrochemistry, macrophytes, bacterio-, phyto-and zooplankton, zoobenthos, fishes, and fisheries management of the lake. Spec...
Article
Lake Peipsi or Lake Peipsi–Pihkva (Pskovsko-Chudskoe ozero in Russian) is a large (3555 km2) shallow (mean depth 7.1 m) moderately eutrophic waterbody with total nitrogen and phosphorus contcentrations respectively 768 and 42 mg m–3. Planktivorous smelt dominates in the fish fauna. The species of zooplankton whose abundance and biomass amount to 20...
Article
Full-text available
Lake Võrtsjärv is a large (270 km2) and shallow (mean depth 2.8 m) lake in Central Estonia. About 2/3 of the lake bottom is covered with mud lying on marl having a total thickness up to 7.6 m. Eighteen rivers and streams collect the water from mainly cultivated catchment area (3374 km2). The outflow into Lake Peipsi occurs via the Suur Emajõgi Rive...
Article
Full-text available
Data on the biomass and productivity of phytoplankton, bacteria, metazooplankton, macrozoobenthos and fishes in eutrophic Lake Võrtsjärv (270 km2, mean depth 2.8 m) were used to construct the carbon balance of the lake. The average annual biomass (g C m-2) and production (g C m-2 y-1) of different links of the food web were the following: phytoplan...
Article
The metazooplankton of the large (270 km2), shallow (mean depth 2.8 m) and strongly eutrophic (total N 2 g m-3, total P 53 mg m-3) Lake Võrtsjärv (Estonia) has been studied monthly during 1991-1993. In connection with increasing trophy, several species (Asplanchna herricki, Bipalpus hudsoni, Conochilus unifornis, Kellicottia longispina, Bosmina ber...
Article
In 1933 a connection was formed between the Black Sea and Lake Palaeostomi (Georgia) after which the latter became a brackish-water lake with water salinity up to 13{}. Water salinity is variable, depending first of all on the direction and strength of the wind. Brachionus rotundiformis (Tschugunoff) (with 20% or more of total zooplankton abundance...
Article
L. Peipsi is one of the richest fish lakes in Europe. Planktivorous smelt dominates in the fish fauna. The abundance of zooplankton fluctuates between 43 600–2241 500 ind m–3, with the average 974 000 ind m–3, biomass ranges from 0,09–3,69 g m–3, with the average 1,86 g m–3. Since the 1960s the abundance of rotifers has risen considerably while the...
Article
Full-text available
Lake Peipsi-Pihkva (3555 km2, mean depth 8.3 m), consisting of three parts, (L. Peipsi, L. Pihkva, L. Lmmijrv) is located on the border of Estonia and Russia. L. Peipsi belongs to unstratified eutrophic lakes with mesotrophic features, L. Lmmijrv has some dyseutrophic features, while L. Pihkva is strongly eutrophic. The total annual nutrient load i...
Article
Rotifers form 71% of the zooplankton of the strongly eutrophic (total N 2 g m–3, total P 53 mg m–3) Vrtsjrv (Estonia). Altogether 150 taxa of rotifers occur. Species characteristic of oligo- and mesotrophic waters have totally disappeared during the last 30 years, or are disappearing now. Species whose numbers and biomass reached 20% or more of tot...
Chapter
Rotifers form 71% of the Zooplankton of the strongly eutrophic (total N 2 g m-3, total P 53 mg m-3) Võrtsjärv (Estonia). Altogether 150 taxa of rotifers occur. Species characteristic of oligo- and mesotrophic waters have totally disappeared during the last 30 years, or are disappearing now. Species whose numbers and biomass reached 20% or more of t...
Article
Full-text available
In the northern part of Lake Peipus, 140 taxa of rotifers were identified, with species of Anuraeopsis, Conochilus, Keratella, Polyarthra and Synchaeta dominating. Two main periods of sexual reproduction occur, in the spring and autumn. Different life cycle patterns are represented. Rotifer number and biomass have two maxima between spring and earl...
Article
The seasonal dynamics of the biomass and production of phyto-, zoo- and bacterioplankton was investigated during the vegetation periods (from May to November) in 1985 and 1986 in the pelagial of the large eutrophic lake Peipsi (Estonia). The average values of productions per vegetation period for the investigation years were as follows: phytoplankt...
Article
The number and biomass of rotifers in large eutrophic lakes is small in winter, reaches a maximum in spring or summer and decreases to a winter minimum. The dynamics of rotifer participation as part of total zooplankton is opposite to their absolute number: the role of rotifers in zooplankton is great in winter, starts decreasing in spring, reaches...

Network

Cited By

Projects

Project (1)