Phytoplankton is the most important primary producer in the aquatic ecosystems and account for half of all photosynthetic activity on earth, thus creating the base for most aquatic food chains. It also plays key role in ...

The thesis addresses three important problems of plant population biology and ecology by studying Estonian populations of sickle medic Medicago sativa L. ssp. falcata (L.) Arcangeli (hereafter falcata), as a model plant ...

In the Baltic States, the main goal in apple- related research has been to find out the winter hardy rootstocks and cultivars. The focus in yield quality studies has been on apple size, appearance and storability. Different ...

Increased human influence causes loss of habitats of plant species and changes in species distribution. Combining changes in species distributions and abundance with their functional traits enables to evaluate species of ...

One of the under-utilised potential agricultural sources of bioenergy feedstock is the herbaceous biomass obtained from semi-natural grasslands. For biodiversity maintenance, it is important that semi-natural grasslands ...

One of the key issues in the debates and research of structural changes in agriculture has been the livelihood and survival of family farms. Reduced demand for agricultural labour due to the technological progress, rising ...

Pikeperch, Sander lucioperca (L.), is a pelagic predator, which plays a key role in many inland water bodies of the temperate zone by structuring populations at lower trophic levels (Frankiewicz et al., 1997; Dörner et ...

Many pollinating insect species have undergone serious declines in both abundance and extent in most European countries. Bumblebees, butterflies, and moths are excellent model organisms for studying environmental changes ...

Spring oilseed rape is an important oilseed crop, the area of which has increased significantly in northern Europe, including Estonia. Spring oilseed rape is predominantly autogamous but cross-pollination can have several ...

About 90% of the organic matter in most aquatic systems is dissolved organic matter (DOM) and the rest forms the pool of particulate organic matter. DOM plays a significant role in the carbon and energy cycle of water ...