Détail de l'auteur
Documents disponibles écrits par cet auteur (12)
Ajouter le résultat dans votre panier Affiner la recherche
Article
Fabio Balotari-Chiebao, Auteur ; Jari Valkama, Auteur ; Patrik Byholm, AuteurWind-energy expansion raises concerns over its potential impacts on bird populations. Birds may be affected directly via collision with turbines or indirectly via habitat loss or displacement due to disturbance. Species with long generation time[...]
Article
Sari Raja-aho, Auteur ; Tapio Eeva, Auteur ; Petri Suorsa, Auteur ; Jari Valkama, Auteur ; Esa Lehikoinen, AuteurDans Ibis (159(4) 2017)Long-distance migratory passerines may exhibit different post-fledging rearing times between their early and late broods due to limited time and energy resources. This could affect the migratory fuelling behaviour, condition and fitness of juven[...]
Article
Irene Conenna, Auteur ; Jari Valkama, Auteur ; Dan Chamberlain, AuteurIn the current scenario of human-induced environmental changes, boreal forest biodiversity appears to be threatened by both deforestation for timber production and climate change. A northern species which has experienced a decline due to ongoing[...]
Article
Jere Tolvanen, Auteur ; Veli-Matti Pakanen, Auteur ; Jari Valkama, Auteur ; Risto Tornberg, AuteurCapsule: Mark–recapture data suggest low apparent survival and sex- and population-specific site fidelity and territory turnover in adult Northern Goshawks Accipiter gentilis breeding in northern Europe.Aims: To understand how species cope with [...]
Article
Risto Tornberg, Auteur ; Seppo Rytkönen, Auteur ; Panu Välimäki, Auteur ; Jari Valkama, Auteur ; Pekka Helle, AuteurAround the nests of many birds of prey the pressure of nest predators is decreased. This attracts other bird species to breed near nests of those birds of prey in order to benefit from protection conferred. This study examines the possible prote[...]
Article
Risto Tornberg, Auteur ; Seppo Rytkönen, Auteur ; Panu Välimäki, Auteur ; Jari Valkama, Auteur ; Pekka Helle, AuteurAround the nests of many birds of prey the pressure of nest predators is decreased. This attracts other bird species to breed near nests of those birds of prey in order to benefit from protection conferred. This study examines the possible prote[...]
Article
Katri Korpela, Auteur ; Pekka Helle, Auteur ; Heikki Henttonen, Auteur ; Erkki Korpimäki, Auteur ; Esa Koskela, Auteur ; Otso Ovaskainen, Auteur ; Hannu Pietiäinen, Auteur ; Janne Sundell, Auteur ; Jari Valkama, Auteur ; Otso Huitu, AuteurThe cyclic population dynamics of vole and predator communities is a key phenomenon in northern ecosystems, and it appears to be influenced by climate change. Reports of collapsing rodent cycles have attributed the changes to warmer winters, whi[...]
Article
Ville Vasko, Auteur ; Toni Laaksonen, Auteur ; Jari Valkama, Auteur ; Erkki Korpimäki, AuteurCosts and benefits of dispersal can vary in space and time, depending on environmental factors and individual state. Plastic, condition-dependent dispersal strategies, in which individuals rely on external cues such as food abundance to adjust t[...]
Article
Estimating sex specific apparent survival and dispersal of Little Ringed Plovers (Charadrius dubius)
Veli-Matti Pakanen, Auteur ; Satu Lampila, Auteur ; Heikki Arppe, Auteur ; Jari Valkama, AuteurSex differences in survival have consequences to population dynamics making information on sex specific survival important. In birds, females often have lower survival than males, and one of the main mechanisms is considered to be differential r[...]
Article
Aleksi Lehikoinen, Auteur ; Esa Lehikoinen, Auteur ; Jari Valkama, Auteur ; Risto A. Vaisanen, Auteur ; Marja Isomursu, AuteurPopulation consequences of parasites in wild birds are rarely documented. One exception is the decline of British finch populations due to an epidemic caused by the protozoan parasite Trichomonas gallinae. Finch trichomonosis has recently spread[...]
Article
Aleksi Lehikoinen, Auteur ; Pertti Saurola, Auteur ; Patrik Byholm, Auteur ; Andreas Linden, Auteur ; Jari Valkama, AuteurCurrent climate change has been found to advance spring arrival and breeding dates of birds, but the effects on autumn migration and possible responses in the distribution of wintering individuals are poorly known. To thoroughly understand the c[...]
Article
Raimo Virkkala, Auteur ; Risto K. Heikkinen, Auteur ; Aleksi Lehikoinen, Auteur ; Jari Valkama, AuteurSpecies inhabiting high-latitude environments are anticipated to be exceptionally vulnerable to climate change because of the greater temperature increases projected for these regions. Earlier studies based on bioclimatic envelope models and bir[...]
