Search Results - "Hakkarainen, Harri"

Carotenoid Composition of Invertebrates Consumed by Two Insectivorous Bird Species by Eeva, Tapio, Helle, Samuli, Salminen, Juha-Pekka, Hakkarainen, Harri

“…Dietary carotenoids are important pigments, antioxidants, and immune-stimulants for birds. Despite recent interest in carotenoids in bird ecology, we know…”
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Using change trajectories to study the impacts of multi-annual habitat loss on fledgling production in an old forest specialist bird by Le Tortorec, Eric, Käyhkö, Niina, Hakkarainen, Harri, Suorsa, Petri, Huhta, Esa, Helle, Samuli

“…The loss and subdivision of habitat into smaller and more spatially isolated units due to human actions has been shown to adversely affect species worldwide…”
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Bacterial spore’s fluorescence dependence on vaporised hydrogen peroxide concentration by Rebane, O, Kirm, M, Poryvkina, L, Hakkarainen, H, Babichenko, S

“…Commonly used biological indicators for assessing the efficiency of decontamination procedures include the spores of Bacillus atrophaeus (BA) and Geobacillus…”
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Food resources, chemical signaling, and nest mate recognition in the ant Formica aquilonia by Sorvari, Jouni, Theodora, Pascal, Turillazzi, Stefano, Hakkarainen, Harri, Sundström, Liselotte

“…Animals such as social insects that live in colonies can recognize intruders from other colonies of the same or different species using colony-specific odors…”
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Real-time monitoring of hydrogen peroxide vapour decontamination of bacterial spores by means of UV fluorimetry by Rebane, O, Hakkarainen, H, Kirm, M, Poryvkina, L, Sobolev, I, Wilska, P, Babichenko, S

“…This study is devoted to the development of a UV fluorimetry sensor capable of real-time monitoring of the decontamination process of microbiological pathogens…”
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Effects of forest patch size on physiological stress and immunocompetence in an area-sensitive passerine, the Eurasian treecreeper (Certhia familiaris): an experiment by Suorsa, Petri, Helle, Heikki, Koivunen, Vesa, Huhta, Esa, Nikula, Ari, Hakkarainen, Harri

“…) breeding in different sized forest patches (0.5–12.8 ha) in moderately fragmented landscapes. We examined the effects of brood size manipulation (reduced,…”
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Forest management is associated with physiological stress in an old–growth forest passerine by Suorsa, Petri, Huhta, Esa, Nikula, Ari, Nikinmaa, Mikko, Jäntti, Ari, Helle, Heikki, Hakkarainen, Harri

“…), is associated with forest fragmentation and forest structure. We found evidence that the concentrations of plasma corticosterone in chicks were higher under…”
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Lifetime reproduction of a forest–dwelling owl increases with age and area of forests by Laaksonen, Toni, Hakkarainen, Harri, Korpimäki, Erkki

“…) increases with the proportion of old forest in the territory because of a higher number of breeding attempts, whereas it decreases with the proportion of…”
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Competitive interactions among raptors in boreal forests by Hakkarainen, Harri, Mykrä, Sakari, Kurki, Sami, Tornberg, Risto, Jungell, Sven

“…We examined inter-specific interactions among goshawks (Accipiter gentilis), common buzzards (Buteo buteo) and honey buzzards (Pernis apivorus) in western…”
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Island selection on mammalian life-histories: genetic differentiation in offspring size by Mappes, Tapio, Grapputo, Alessandro, Hakkarainen, Harri, Huhta, Esa, Koskela, Esa, Saunanen, Raimo, Suorsa, Petri

“…Since Darwin's pioneering work, evolutionary changes in isolated island populations of vertebrates have continued to provide the strongest evidence for the…”
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Urbanization and Stability of a Bird Community in Winter by Suhonen, Jukka, Jokimäki, Jukka, Kaisanlahti-Jokimäki, Marja-Liisa, Hakkarainen, Harri, Huhta, Esa, Inki, Kimmo, Suorsa, Petri

“…The main objective of this study was to analyze between-winter stability of bird communities along latitudinal (950 km) and urban gradients (from small village…”
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Coexistence of territorial competitor ants in fragmented boreal forest landscape by Sorvari, Jouni, Huhta, Esa, Hakkarainen, Harri

“…The distribution of species in a patchy habitat may be influenced by competitive interactions. The dominant and highly competitive boreal ant species belong to…”
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Environmental pollution has sex-dependent effects on local survival by Eeva, Tapio, Hakkarainen, Harri, Laaksonen, Toni, Lehikoinen, Esa

“…Environmental pollutants cause a potential hazard for survival in free-living animal populations. We modelled local survival (including emigration) by using…”
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Forest fragmentation is associated with primary brood sex ratio in the treecreeper (Certhia familiaris) by Suorsa, Petri, Helle, Heikki, Huhta, Esa, Jäntti, Ari, Nikula, Ari, Hakkarainen, Harri

“…Certhia familiaris…”
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Experimental Increase of Predation Risk Induces Breeding Dispersal of Tengmalm's Owl by Hakkarainen, Harri, Ilmonen, Petteri, Koivunen, Vesa, Korpimäki, Erkki

“…Nest predation and its avoidance are critical components of an individual's fitness and play an important role in life history evolution. Almost all studies on…”
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Habitat composition as a determinant of reproductive success of Tengmalm's owls under fluctuating food conditions by Hakkarainen, Harri, Mykrä, Sakari, Kurki, Sami, Korpimäki, Erkki, Nikula, Ari, Koivunen, Vesa

“…The effect of landscape composition on the breeding success of vole-eating Tengmalm's owl (Aegolius funereus) was studied in western Finland at five different…”
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Wood ants are wood ants: deforestation causes population declines in the polydomous wood ant Formica aquilonia by SORVARI, JOUNI, HAKKARAINEN, HARRI

“…1. One of the main themes in ecology is adaptation for survival in different habitats and the potential of the environment to regulate populations. 2. The…”
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Home range size is determined by habitat composition but feeding rate by food availability in male Tengmalm’s owls by Santangeli, Andrea, Hakkarainen, Harri, Laaksonen, Toni, Korpimäki, Erkki

“…Animal populations are often limited by food and rearing offspring is energetically demanding. Life history theory predicts that parents of altricial bird…”
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Forest clearing and sex ratio in forest-dwelling wood ant Formica aquilonia by Sorvari, Jouni, Hakkarainen, Harri

“…Sex ratios of ants have been shown to vary with food resource levels in several studies, but it is not known whether forest clear-cutting has any effect on sex…”
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Bacterial spore's fluorescence dependence on vaporised hydrogen peroxide concentration /Bakterispooride fluorestsentsi soltuvus umbritsevast vesinikperoksiidgaasi kontsentratsioonist by Rebane, Ott, Kirm, Marco, Poryvkina, Larisa, Hakkarainen, Harri, Babichenko, Sergey

“…Commonly used biological indicators for assessing the efficiency of decontamination procedures include the spores of Bacillus atrophaeus (BA) and Geobacillus…”
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