(Co)investigator from the Department: David Boukal
Funding provider: The Czech Science Foundation
Duration: 2017 - 2019

Project description: 
Understanding climate change impacts on ecosystems is one of the most important challenges to current ecology and conservation biology. While many freshwater ectotherms are particularly vulnerable to rising temperatures due to their limited dispersal ability, they may mitigate the impact of thermal stress by phenotypically plastic responses. We combine mathematical modelling and laboratory experiments to understand the role of temperature-dependent individual performance and temperature-induced phenotypic plasticity on individual life histories and interspecific interactions. Our model groups include aquatic insects and newts (in collaboration with Lumír Gvoždík from the Institute of vertebrate biology, Czech Academy of Sciences).

Principal investigator: Jiří Kopáček
(Co)investigator from the Department: Hana Šantrůčková
Funding provider: The Czech Science Foundation
Duration: 2017 - 2019

Project goals: 
An integrated study on effects of changing environmental chemistry, climate and vegetation on (1) soil microbial community (2) P cycle, its links with C and N cycles in soils and role in N-saturation, (3) weathering rate and P liberation from bedrock, and (4) pollution of receiving waters with P.

Project description: 
Unmanaged central European ecosystems (the Bohemian Forest and Tatra Mountains) have been exhibiting world’s largest recovery from atmospheric acidification. Resulting changes in biogeochemical processes and P, N and C cycles in soils are further affected by rapid changes in climate and vegetation, resulting in undesired losses of these nutrients from terrestrial to aquatic ecosystems. The extent and rate of nutrient losses and water pollution differ between catchments, reflecting soil and bedrock composition and vegetation health. On the basis of our long-term research in these areas, we propose a set of integrated laboratory and field studies on effects of changing precipitation chemistry, climate, and vegetation on (1) soil microbial community at sites differing in P sources and availability, (2) P cycle in soils and its links with C and N cycles, especially effects of P availability on N-saturation of catchments and the role of organic C in P leaching, (3) weathering rate and P liberation from bedrock and soils, and (4) pollution of receiving waters with this key nutrient.

Principal investigator: Jaroslav Vrba
(Co)investigator from the Department: Jaroslav Vrba
Funding provider: The Czech Science Foundation
Duration: 2017 to 2019

Project goals: 
Aim of the project is to explore plankton diversity and dynamics, key players and their functional traits, and to estimate primary production, respiration, nutrient mobilisation, and production efficiency in the hypertrophic fishponds that allow refining and testing of general ecological hypotheses.

Project description: 
Fishponds are semi-natural, man-controlled, shallow ecosystems used for fish production. Different management results in different ecological states that predestine the fishponds as unique model systems. Nutrient loads and fish overstock have led to fishpond hypertrophy; however, interactions in the plankton communities under such extreme conditions remain unexplored. We are lacking data on primary production, community respiration, diversity and functions of heterotrophic microbial food webs in eutrophic freshwaters, as well as about the effects of fish on their food web structure. We hypothesise that hypertrophic conditions result in net ecosystem heterotrophy, an increase in heterotrophic microbial biomass and nutrient mobilisation, and a decrease in net ecosystem productivity and cost effectiveness. Under the conditions of high (auto- and heterotrophic) microbial biomass, intensive photosynthesis and respiration processes cause ecosystem imbalances and low resource use efficiency that results in higher plankton (mainly microbial) diversity due to niche diversification.

(Co)investigator from the Department: Jana Jersáková
Funding provider: The Czech Science Foundation
Duration: 2018 to 2020

Project goals: 
The project aims to identify the factors underlying co-existence and niche partitioning of orchids in species-rich habitats of two climatically different regions by exploration of functional traits of orchids and their mycorrhizal fungi.

Project description: 
Plant species can co-exist under natural conditions due to niche partitioning and an association with mycorrhizal fungi is one way to differentiate resources. Orchids critically rely on mycorrhiza during life cycle, and coexistence may be strongly contingent on the functional traits (FT) of their symbionts. Congruently, co-occurring orchids tend to associate with distinct mycorrhizal communities. It is however unclear to what extent orchid mycorrhizal fungi differ in ecological strategies and corresponding FT to enable effective niche partitioning. We propose to explore FT of orchid-fungus communities in species-rich habitats of two climatically different regions with special focus on enzymatic activity and nutrient utilization of fungi, mycorrhizal specificity under different conditions and presence of endohyphal bacteria. Using bipartite network modelling and multivariate statistical models we will describe the network structure and co-variation of FT of both symbiotic partners. The FT of orchid mycorrhizal fungi will be explored in such a complex approach for the first time.