In an environment fluctuating in a predicatable manner with wide among-year variation in offspring mortality, fitness is largely influenced by the timing of reproductive investment. In vole-eating nocturnal Tengmalm's owls (Aegolius funereus), within-cycle variation in 1st-year survival of owlets is
✦ LIBER ✦
Nest defence of Tengmalm's owls reflects offspring survival prospects under fluctuating food conditions
✍ Scribed by Harri Hakkarainen; Erkki Korpimäki
- Book ID
- 115569749
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 309 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0003-3472
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We studied egg size variation of Tengmalm's owls in western Finland during 1981-1990. The owls fed on voles whose population fluctuated in a predictable manner: low (1981, 1984, 1987, 1990), increase (1982, 1985, 1988) and peak (1983, 1986, 1986) phases of the cycle occurred every third year. Eggs w