Papers by Hannu Pietiäinen
Tawny owl reproduction and offspring sex ratios have been considered to depend on the abundance o... more Tawny owl reproduction and offspring sex ratios have been considered to depend on the abundance of small voles. We studied reproductive performance (laying date, clutch and brood size) during 1995–2003 and offspring sex ratios from 1999 to 2003 in relation to the abundance of small voles and food delivered to the nest in a tawny owl population in southern Finland. Abundance of small voles (field and bank voles) was based on trappings in the field, and estimates of food delivery was based on diet analysis of food remains in the nest boxes. In this population, reproductive output was not related to the abundance of small voles. Analysis of food delivered to the nest showed that the prey weight per offspring varied more than twofold between years and revealed that this difference was mainly related to the proportion of water voles in the diet. Only the number of water voles correlated with laying dates. Offspring sex ratios were weakly male biased (55%) but did not differ from parity. ...
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Proceedings. Biological sciences / The Royal Society, Jan 22, 2014
The cyclic population dynamics of vole and predator communities is a key phenomenon in northern e... more The 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, which weaken the interaction between voles and their specialist subnivean predators. Using population data collected throughout Finland during 1986-2011, we analyse the spatio-temporal variation in the interactions between populations of voles and specialist, generalist and avian predators, and investigate by simulations the roles of the different predators in the vole cycle. We test the hypothesis that vole population cyclicity is dependent on predator-prey interactions during winter. Our results support the importance of the small mustelids for the vole cycle. However, weakening specialist predation during winters, or an increase in generalist predation, was not associated with the loss of cyclicity. Strengthening of delayed density dependence...
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Functional Ecology, 2008
Summary 1. Maternal effects have been suggested to function as a mechanism for transgenerational ... more Summary 1. Maternal effects have been suggested to function as a mechanism for transgenerational plasticity, in which the environment experienced by the mother is translated into the phenotype of the off- spring. In birds and other oviparous vertebrates where early development is within the egg, mothers may be able to improve the viability prospects of their offspring at hatching by
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The American Naturalist, 2000
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The American Naturalist, 2004
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Proceedings of the Royal Society B: Biological Sciences, 2002
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Oikos, 2009
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Oecologia, 2003
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Oecologia, 2011
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Oecologia, 2004
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Journal of Ornithology, 2008
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Journal of Evolutionary Biology, 2007
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Journal of Evolutionary Biology, 2007
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Journal of Animal Ecology, 1998
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Journal of Animal Ecology, 2004
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Journal of Animal Ecology, 2003
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Ibis, 2013
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Forest Ecology and Management, 2009
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Ecology Letters, 2008
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Canadian Journal of Zoology, 2009
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Papers by Hannu Pietiäinen