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Article
Indrikis A. Krams, Auteur ; Tatjana Krama, Auteur ; Todd M. Freeberg, Auteur ; Ronalds Krams, Auteur ; Kathryn E. Sieving, AuteurPredation is an essential factor affecting prey populations, yet attacks are notoriously difficult to observe in real time. Here, we provide descriptive data about the attack behavior of Eurasian Sparrowhawks (Accipiter nisus) and the escape tac[...]
Article
Tatjana Krama, Auteur ; Ronalds Krams, Auteur ; Dina Cīrule, Auteur ; Fhionna R. Moore, Auteur ; Markus J. Rantala, Auteur ; Indrikis A. Krams, AuteurIn birds, haemosporidian parasites have been found to have direct pathogenic effects on the host with important consequences for their fitness. However, less is known about distribution patterns of parasite vectors, which may significantly affec[...]
Article
Indriķis Krams, Auteur ; Valerija Suraka, Auteur ; Kalev Rattiste, Auteur ; Mikus Abolins-Abols, Auteur ; Tatjana Krama, Auteur ; Markus J. Rantala, Auteur ; Pranas Mierauskas, Auteur ; Dina Cīrule, Auteur ; Lauri Saks, AuteurBlood parasites often incur a substantial fitness cost to the infected individuals, sometimes resulting in death of the host. Some bird species, however, are apparently free of blood parasites, presumably due to the lack of exposure to blood par[...]
Article
Tatjana Krama, Auteur ; Indriķis Krams, Auteur
Article
Indriķis Krams, Auteur ; Kristine Igaune, Auteur ; Tatjana Krama, Auteur
Article
Indriķis Krams, Auteur ; Dina Cīrule, Auteur ; Tatjana Krama, Auteur ; Jolanta Vrublevska, AuteurIn high latitudes, thermoregulatory and behavioural adjustments of birds allow survival under extreme ambient temperatures, changing day length, and food availability. In such habitats with such fluctuating environmental conditions, dominant ind[...]
Article
Indriķis Krams, Auteur ; Tatjana Krama, Auteur
Article
Tatjana Krama, Auteur ; Valerija Suraka, Auteur ; Markku Hukkanen, Auteur ; Seppo Rytkönen, Auteur ; Markku Orell, Auteur ; Dina Cīrule, Auteur ; Markus J. Rantala, Auteur ; Indriķis Krams, AuteurSeveral studies have shown considerably poorer breeding success of Great Tit Parus major populations in northern Finland than in mid- and western Europe. The aim of this study was to find out whether the poor success is linked to physiological c[...]
Article
Dina Cīrule, Auteur ; Tatjana Krama, Auteur ; Jolanta Vrublevska, Auteur ; Markus J. Rantala, Auteur ; Indriķis Krams, AuteurMeasuring circulating glucocorticoids is a widely used method to assess stress in animals. However, hormones must be sampled within the first few minutes of capture, which makes it difficult to discriminate between hormone baseline levels and th[...]
Article
Kristne Igaune, Auteur ; Indriķis Krams, Auteur ; Tatjana Krama, Auteur ; Jadviga Bobkova, AuteurMating calls of animals are often detected by unintended receivers which use sexual signals to obtain information about the signaller. We investigated whether white storks Ciconia ciconia can eavesdrop mating calls of moor frogs Rana arvalis. Wh[...]
