Tag: Boreal Owl

Diet of breeding Tengmalm’s Owls Aegolius funereus: long-term changes and year-to-year variation under cyclic food conditions

Boreal Owl (aegolius funereus) Science Article 5 abstract The diet of breeding Tengmalm’s Owl , A. funereus was studied in the Kauhava region, west Finland, using two methods: identification of prey animals cached in the nest-holes(a total of 4366 prey items in 1973-86) and found in the pellets and orher prey remains colletred from de […]

Clutch size and breeding success in relation to nest box size in Tengmalm’s Owl golius funereus

Boreal Owl (aegolius funereus) Science Article 2 abstract Clutch size and breeding success was related to nest-box size in 215 nests of Tengmalm’s owl in the Kauhava region, western Finland in 1966-82, In vole peak years, but not in other years, mean clutch size was positively correlated with the bottom area of the nest-box, increasing […]

Do Tengmalm’s owls see vole scent marks visible in ultraviolet light?

Boreal Owl (aegolius funereus) Science Article 3 abstract Scent markings (urine and f ces) of small mammals are visible in ultraviolet (UV) light. Diurnal kestrels, Falco tinnunculus, use them as a cue to find areas of food abundance. We studied whether vole-eating, nocturnal Tengmalm’s owls, golius funereus, can see vole scent marks using UV-vision. In […]

Experimental increase of predation risk induces breeding dispersal of Tengmalm’s owl

Boreal Owl (aegolius funereus) Science Article 4 abstract 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 this topic have been observational, and thus have not been able to separate the effects of individual quality, habitat selection and predation […]

Clutch size and breeding success of Tengmalm’s Owl golius funereus in natural cavities and nest boxes.

Boreal Owl (aegolius funereus) Science Article 1 abstract Altogether 287 nests of Tengmalm s Owl golius funereus were visited in 1960-82 in westem Finland. The-clurches were si’nificantly larger in nest-boxes than in natural cavities. The hatching percentage and number of fledglings also seemed to be higher in boxes than in natural nesting places. But the […]