Jaanus Terasmaa

Jaanus Terasmaa
Tallinn University | TLU · Institute of Ecology

PhD in ecology

About

79
Publications
9,748
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
384
Citations
Citations since 2017
37 Research Items
183 Citations
2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
2017201820192020202120222023010203040
Additional affiliations
January 1998 - present
Tallinn University
Education
September 2001 - June 2005
Tallinn University
Field of study
  • Ecology

Publications

Publications (79)
Article
Full-text available
The COVID-19 pandemic challenged the sustainability of higher education as millions of students were forced out of school, shifting to online learning instead of in-class education. In the Erasmus+ project, Virtual Presence in Higher Education Hybrid Learning Delivery (VIE), we were concerned with the level of readiness and the ability of higher-ed...
Article
Full-text available
The quality of people’s daily lives is dependent on the functioning of natural systems - ecosystem services. These services are essential for social and economic development of our society and for ensuring the well-being of humans. This dependency is not easily understandable, as it is non-linear. The use of games has been proven a successful metho...
Chapter
Full-text available
Harrastusteaduse kasutamises keskkonna- ja hüdroloogilises seires ei ole maa- ilma mõistes midagi uut. Mitmetes riikides on vabatahtlike seire programmid töös juba aastaid ning nende abil loodud andmekogud on väga väärtuslikud just pikkade aegridade saamiseks. Vabatahtlike abiga keskkonnaandmete kogumine on suhteliselt aja- ja kuluefektiivne, see...
Conference Paper
Full-text available
According to the EU WFD, the Member States sharing transboundary GWBs should carry out joint evaluation of the groundwater resources. To ensure this, it is important to establish a representative cross-border groundwater monitoring network. The transboundary area of Estonia (EE) and Latvia (LV) is sparsely populated and features a relatively scarce...
Conference Paper
Full-text available
As groundwater does not follow human-drawn boundaries such as country borders, groundwater pollution in one country can adversely affect groundwater quality and availability in a neighboring country. It is vital to develop a conceptual understanding of shared groundwater resources not only to ensure their protection but also to avoid future conflic...
Article
In Estonia, karst aquifers supply roughly a third of annually abstracted domestic groundwater. Karst systems recharged by allogenic humic-rich streams originating from mire-dominated watersheds are common in Lower Estonia (lowlands). This study aimed to characterize the hydrology and hydraulics of two binary lowland karst systems: Salajõe (SKS) and...
Article
Full-text available
Radiocarbon-dated peat cores collected from an ombrotrophic bog in southern Estonia record shifting environmental conditions and carbon accumulation rates in northern Europe during the late Holocene. Modern observations indicate that the water balance of the peatland is highly influenced by changes in relative humidity, followed by temperature and...
Article
A pilot study was carried out in the Matsi spring fen, southern Estonia to test a proposed methodology (Terasmaa et al., 2020) for identifying potential effects of groundwater bodies on groundwater dependent terrestrial ecosystems (GDTE). A comprehensive hydrochemical and isotopic dataset was collected and analyzed using multivariate statistical me...
Article
Full-text available
Higher Education engineering students need to be prepared to address sustainable solutions to the complex problems faced in this century. They should become proficient problem solvers, able to work in multidisciplinary teams, ready to adapt to new technologies, and able to acquire new knowledge and skills when needed. Usually known as soft skills,...
Technical Report
Full-text available
Joint methodology for identification and assessment of GDTEs was developed to identify GDTEs in trans-boundary Gauja-Koiva river basin (funded by Interreg EstLat project “GroundEco”). The methodology and best GDTEs assessment techniques were tested in two pilot areas – Matsi spring fen in Estonia and Kazu leja valley in Latvia. Finally, recommendat...
Conference Paper
This paper will show the proposals that are being developed in the HERA project. This is an Erasmus+ project whose purpose is to address the interdisciplinary soft skill needs of HE in the fields of engineering and economics. HERA deploys active to expose HE students to complex challenges, the solution to which requires the integration of interdisc...
Chapter
Dynamic interactions between ground- and surface water are widely known, but the role of groundwater in terrestrial and aquatic ecosystems is often poorly understood and documented due to the spatiotemporal complexity. Many countries have not yet completed the assessment of groundwater dependent ecosystems (GDEs). GDEs are valuable ecosystems that...
Poster
Full-text available
A project that aims to enhance sustainable management of common groundwater resources and associated ecosystems in the transboundary Gauja-Koiva river basin (Latvia-Estonia). (1) selection of GDTE types (2) additional criteria in selecting GDTEs (3) identification of GDTEs in Gauja–Koiva river basin (4) quantity assessment and quality assessment...
Conference Paper
Full-text available
This research is carried out in the framework of the project "Joint management of groundwater dependent ecosystems in transboundary Gauja-Koiva river basin" (GroundEco, Est-Lat62) funded by ERDF Interreg Estonia-Latvia cooperation programme. The main aim of GroundEco is to develop a common understanding and joint methodology for the Estonian and La...
Conference Paper
Full-text available
Groundwater dependent ecosystems (GDEs) are valuable ecosystems that depend on groundwater input and cannot be considered and assessed separately. Dynamic interactions at the surface-groundwater interface are widely recognized, but the role of groundwater in terrestrial ecosystems is not well documented. Any changes in the water supply or chemical...
Article
Environ 4,8 % du territoire de l’Estonie est recouvert de plans d’eau : plus de 110 000 objets au total. Les lacs naturels représentent le plus petit groupe (1 562), derrière les étangs (51 780) et les tourbières (45 309) en ordre de grandeur. Parallèlement, seulement 51 des plans d’eau excèdent les 1 000 000 m² (100 ha), la plupart d’entre eux...
Article
La région des lacs de Kurtna, située dans le nord-est de l’Estonie, compte le plus grand nombre de lacs par km2 du pays : 38 lacs naturels sur une superficie de 30 km2. Cette zone unique a subi une forte influence anthropique au milieu du 20e siècle et cette influence est encore d’actualité. L’extraction de schiste bitumineux, de sable et de to...
Article
Artificial and natural tracers have been frequently used to study the water interactions in the river-karst aquifer continuum. Dissolved organic matter (expressed in the form of total or dissolved organic carbon) has proven to be an effective soil-related parameter when studying the recharge behavior of karst aquifers in many cases. In this study w...
Chapter
Full-text available
Mobile and ubiquitous learning models have been widely adopted in technology-enhanced learning (TEL) practices. Apart from potential benefits, these models introduce additional complexity in designing, monitoring and evaluating learning activities, as learning happens across different spaces. In recent years, literature on learning design (LD) and...
Article
Full-text available
The abundance and properties of small standing water bodies (SSWB) is globally not well known for their ecological importance is undervalued and their detection suffers from technical limitations. In the current study, we used a combination of GIS-based methods (satellite, orthophoto, ground validation) to evaluate regional estimates of standing wa...
Poster
Full-text available
We are undertaking a multidisciplinary investigation of two pilot sites: Matsi spring mires in Estonia and Kazu leja subglacial paleo-valley with tufa (freshwater lime) deposits in Latvia. The research objective is to explore the extent of groundwater dependence in these sites and to identify the most suitable indicators of groundwater discharge an...
Poster
Full-text available
First project results on development of joint methodology for groundwater dependent terrestrial ecosystem identification and assessment in trans-boundary area (Estonia - Latvia). Abstract available at: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-6016.pdf
Poster
Full-text available
Dynamic interactions at the surface–ground water interface are widely recognised but due to the spatiotemporal complexity, the role of groundwater in terrestrial and aquatic ecosystems is poorly understood and documented. The majority of the countries have not finished the assessment of groundwater dependent ecosystems (GDEs). GDEs are valuable eco...
Conference Paper
Full-text available
In France, in the last few years, a lot of ponds have been removed during operations of river restoration, remobilizing the sediments that had been deposited behind the dam over the years. Pond sediments are complicated mixtures predominantly consisting of rocks and soils particles from the watershed, atmospheric dust brought by winds, algae and or...
Article
Full-text available
Article
Full-text available
As karst aquifers are often characterised by non-linear behaviour, ascertaining the turning points in their hydraulic regime may provide essential information on the functioning of the aquifer. These characteristics also apply to the Silurian-Ordovician aquifer system, composed of diverse carbonate rocks, in Estonia. The aquifer system is an import...
Article
A long-term perspective of past hydroclimate variability for the Baltic region provides important context for evaluating the potential impacts of Northern Hemisphere temperature changes and shifting ocean-atmospheric interactions on northern European climate. Lake Nuudsaku is an open-basin lake in south-central Estonia with seasonal overflow fed by...
Conference Paper
Full-text available
Mobile technology with numerous affordances provides opportunities to take learning outside of classrooms, into authentic contexts. This paper presents a location-based tool – Avastusrada - which allows teachers to easily create learning tracks by developing different types of tasks connected to specific locations. The paper reports preliminary res...
Article
Full-text available
A multi-indicator paleolimnological study of sediments from Lake Ķūži (central Latvia) was used to obtain a comprehensive record of environmental changes in the Holocene. Periodicity in the changes and the main drivers (lake basin development, catchment properties, climate, human activities) of the sedimentary record was studied. In order to compre...
Article
Full-text available
According to the European Union Water Framework Directive groundwater and surface-water resources have to be managed in an integrated way. The utilisation of groundwater resources must not harm surface-water ecosystems that are directly dependent on groundwater. The study evaluates the effects of increased groundwater abstraction (a) on a regional...
Article
Full-text available
This study demonstrates the effect of drastic water-level changes to the aquatic vegetation in three small oligotrophic lakes situated in Kurtna Kame Field in northeastern Estonia. The area holds around 40 lakes in 30 km 2 of which 18 lakes are under protection as Natura Habitat lakes (Natura 2000 network). The area is under a strong human impact a...
Article
Full-text available
Having reliable estimates of the number of water bodies on different geographical scales is of great importance to better understand biogeochemical cycles and to tackle the social issues related to the economic and cultural use of water bodies. However, limnological research suffers from a lack of reliable inventories; the available scientific refe...
Article
Full-text available
Groundwater dynamics affect lake water budgets, but its major factors and mechanisms still need clarification. This study evaluates the effects of surrounding groundwater flow on seepage direction and assesses factors that affect seepage flux in a closed-basin lake in northeastern Estonia – Lake Martiska. A piezometric map was used to determine dir...
Article
Full-text available
This study identifies the water-level fluctuation signals from the lake sediment. The water level of small Lake Martiska (Estonia) decreased 3.4 m from 1946 to 1987 and only 29% of lake area and 21% of total volume remained. Since the 1990s the water level started to rise. The comparison between the LOI, grain-size distribution and documented water...
Conference Paper
Full-text available
Until recently, the small water bodies have been disregarded in the environmental management and protection policies. For example, the European Water Framework Directive 2000/60/EC proposes the threshold surface area of water bodies for typology and reporting as 50 ha. The inventories on state level or scientific studies took into account smaller w...
Conference Paper
Full-text available
In order to comprehend and interpret the palaeoecological signal it is highly essential to understand the processes and extent how the historically recorded changes are stored in sediments. This study compares the eight short-core sediment records of Lake Martiska (Estonia) with documented historical changes in human impact to identify the water-le...
Conference Paper
Full-text available
This study focuses on the impact of anthropogenically caused intense water-level changes on three small ecologically sensitive Natura habitat lakes, on their ecology and restoration. The three studied lakes (Lake Martiska, Lake Kuradijärv and Lake Ahnejärv) are situated in central area of Kurtna Kame Field which is a naturally unique area due to a...
Conference Paper
Full-text available
Lakes' response to the chances in water chemistry were studied with the aim of acquiring new knowledge about protection of the anthropogenically influenced lakes. To evaluate the impact of oil shale mine water on the lake ecosystem status we compared macrophyte compositions of pre-industrial period to nowadays. For a more detailed picture of change...
Conference Paper
Full-text available
The Kurtna Kame Field in northeastern Estonia contains around 40 small lakes in a 30 km 2 area. In 1972 a groundwater intake was established in the central part of the Kame Field into an unconfined Quaternary aquifer, which consists mostly of glacial sands. That caused a more than 3 m water-level drop in the closed-basin lakes near the intake, incl...
Article
Full-text available
Numerous lakes in the world serve as sensitive indicators of climate change. Water levels for lakes Ahnejärv and Martiska, two vulnerable oligotrophic closed-basin lakes on sandy plains in northeastern Estonia, fell more than 3 m in 1946– 1987 and rose up to 2 m by 2009. Earlier studies indicated that changes in rates of groundwater abstraction wer...
Article
Full-text available
Bottom sediments of Lake Peipsi proper were mapped in the 1970s’ from the research vessel but for technical reasons near shore areas were not investigated. The present work is the first attempt to fill this gap. Based on the surface sediment mapping of the whole lake basin, we identified 11 key areas of the littoral zone and provided a detailed sur...
Article
Full-text available
This study uses the Holocene lake sediment of Lake Ķūži (Latvia, Vidzeme Heights) for environmental reconstruction with multi-proxy records including lithology, computerised axial tomography scan, grain-size analysis, geochemistry, diatoms and macrofossils, supported by AMS radiocarbon dating. Numerical analyses (PCA; CONISS) reveal three main phas...
Article
Full-text available
Traditionally the elevated concentrations of PAHs in the bottom sediments of Lake Peipsi are explained by the influence of oil shale industry. To estimate the role of Narva Power Plants (Narva PP) in the deposition of PAHs, we investigated the 210Pb dated sediment core from Lake Pihkva, where the influence of oil shale industry should be minimal. T...
Article
Full-text available
Environmental risk about water quality of lakes in Kurtna landscape reserve (Estonia) by the study of water temperature and dissolved oxygen. The Kurtna reserve (North-Eastern Estonia) includes about forty lakes of hydro-glacial origin, among which the most are kettle hole lakes. Their level and the quality of water are conditioned by aquifers, whi...
Article
Full-text available
Small lakes and their sediments are widely used for palaeolimnological reconstructions. Often only one core from the deepest part of the lake is used for reconstructing the lake catchment development, water-level changes and climate. To interpret palaeoinformation correctly, it is necessary to understand the spatio-temporal dynamics and the essence...
Article
Full-text available
Sediment samples from an outcrop in the near-shore area of Lake Ķūži (Vidzeme Heights, Central Latvia) were investigated using palaeobotanical (pollen and macrofossil analysis) and lithological (grain-size analysis) methods and accelerator mass spectrometry 14 C dating. A dark, organic-rich sediment layer was found below 1.7 m of sandy layers appro...
Conference Paper
Full-text available
Present research compare the sediment records of Lake Martiska (NE Estonia, N59°15´45É 27°34´13área 3.5 ha, maximum depth of 8.5 m) with well-documented historical changes in human impact to identify the factors dominantly affecting the sediment lithological composition. Kurtna area lies in a transitional zone between densely populated and heavily...
Conference Paper
Full-text available
The spatial distribution, composition and texture of lake sediments reflect a complex interaction between the catchment characteristics, in-lake processes and morphology of the lake basin (topography of the basin and sediment surface, shape and size of the lake, etc.) The main aim of this study was to reconstruct the history of sedimentation during...
Article
Full-text available
To describe and analyse the role of sediments in the matter cycling in large shallow transboundary Lake Peipsi (L. Peipsi) in north-eastern Europe, detailed surface-sediment mapping was conducted. On the basis of grain size the surface sediments fall into three groups: coarse-grained sediments (prevailingly sands in the lake’s southern part), fine-...
Article
Full-text available
The distribution of 11 individual polycyclic aromatic hydrocarbons (PAHs) was analysed in a (210)Pb dated sediment core from the deepest area of Lake Peipsi and in four surface sediment samples taken from littoral areas. According to the concentrations in the core three groups of PAHs may be distinguished: (1) relatively stable concentrations of PA...
Article
Full-text available
This research uses a comparison of the sediment record of Lake Martiska (NE Estonia) with well-documented historical changes in human impact to identify the factors dominantly affecting the sediment lithological composition, and the accumulation of heavy metals and other microelements into the sediments. To this end, comprehensive lithological-geoc...
Chapter
Full-text available
Lithological and granulometric investigations of the surface and short core sediments in L. Martiska (northeastern Estonia) showed that variations in the grain-size parameters and LOI content were influenced by the changes in deposition conditions during the regression and transgression phases monitored in the lake since the 1960s. During the regre...
Article
Full-text available
During a yearlong observation, settling fluxes of seston in the epilimnion and hypo-limnion of Lake Viitna Linajärv varied from 230 to 1400 mg m –2 d –1 . Most of the seston consisted of particulate organic matter (POM). The POM content in the dry matter of surface sediments sampled from the entire lake floor was on average over 50%. Seasonal chang...
Thesis
Full-text available
The present study focuses on seston fluxes and sediment accumulation in small Estonian lakes. The study of these processes in small lakes is necessary because the research made in the world so far has been devoted mainly to large lakes, where the processes are to a great extent affected by wave action. As sediment reflect changes that have occurred...
Article
Full-text available
Surface sediments and sediment cores from Lake Väike Juusa were studied in order to examine the dependence of the sedimentation regime on the topography and development of the lake. Close relationship was established between the grain size of the surface samples and depth of water at the sampling site. The data obtained show that in the lake the ac...
Article
Full-text available
In small lakes (< 10 ha) the process of sedimentation is not influenced very strongly by wind and wave activity and spatio-temporal variations in the composition of sediments are related with the topography of the current basin. Investigations on surface sediments (LOI, grain-size composition) in two small Estonian lakes – Lake Viitna Linajärv and...
Article
Full-text available
A short-core palaeolimnological investigation was undertaken with the aim ofacquiring knowledge of sediment deposition. Analyses of the lithological composition of sediments from the whole-lake basin were performed on the small eutrophic L. Linajrv (northern Estonia) and the concentrations of mineral and organic matter were measured on 647 sub-samp...