Wiesław Walankiewicz

• University of Siedlce

Tree cavities are important structural elements of forest ecosystem that host numerous birds, mammals and other cavity-dependent organisms. Pattern of cavity distribution in temperate and boreal forests are relatively well studied, yet little is known about cavities in tropical and subtropical forests. We compared cavity availability in relation to...

W ostatnich miesiącach odżyły wieloletnie spory pomiędzy zwolennikami ingerencji w naturalne procesy zachodzące w lasach Puszczy Białowieskiej oraz prowadzenia w niej gospodarki leśnej a rzecznikami traktowania Puszczy jako lasu unikalnego, bezcennego skarbu natury, postulującymi zwiększenie zakresu jego ochrony. Domagając się utrzymania obecnie ob...

Climate changes also affect European forests. Some species of trees, like Norway spruce Picea abies, are sensitive to high temperatures and water deficiency. After having been weakened by summer droughts they become vulnerable to more intensive colonization of tree-eating insects. Spruce trees which become infested by the European spruce bark beetl...

Tree cavities are vital resources for many animals, especially birds and mammals. We aimed to determine density of cavity resources in coniferous spruce-pine (Pinus/Picea genera) stands of the Białowieża Forest, Poland, and to correlate their presence with tree species composition, and characteristics of trees and stands (condition, DBH, basal area...

Summary information on studies of the relationship between clutch size and nest size in different species of birds.

Nests are structures built to support and protect eggs and/or offspring from predators, parasites, and adverse weather conditions. Nests are mainly constructed prior to egg laying, meaning that parent birds must make decisions about nest site choice and nest building behavior before the start of egg-laying. Parent birds should be selected to choose...