Search
Now showing items 1-10 of 55
Items matching your query
How phytoplankton pigments reflect historical and contempoarary status of large shallow lakes?
(Eesti Maaülikool, 2012)
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 ...
Genetic diversity, genotypic structure and vulnerability of native populations of sickle medic (Medicago sativa ssp. falcata) in Estonia
(Eesti Maaülikool, 2013)
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 ...
Changes in the biochemical composition of apple (Malus domestica Borkh.) fruits depending on rootstock and calcium treatment
(Eesti Maaülikool, 2013)
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 ...
Long-term changes in the Estonian flora and measures for conservation
(Eesti Maaülikool, 2014)
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 ...
Biomass from semi-natural grassland for bioenergy
(Eesti Maaülikool, 2014)
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 ...
Structural adjustment of Estonian agriculture – the role of institutional changes and socioeconomic factors of farm growth, decline and exit
(Eesti Maaülikool, 2014)
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 ...
The diet of juvenile pikeperch Sander lucioperca in lakes Peipsi and Võrtsjärv: relations between long-term changes in the fish communities and food resources in large shallow lakes
(Eesti Maaülikool, 2012)
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 ...
Variation in the habitat requirements of pollinating insects in semi-natural meadows
(Eesti Maaülikool, 2014)
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 ...
The Impact of Spring Oilseed Rape Fertilization and Pesticide Application on Bees (Apoidea)
(Eesti Maaülikool, 2012)
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 ...
Dissolved organic matter and its ecological role in large and shallow water bodies
(Eesti Maaülikool, 2013)
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 ...