Habitat composition as a determinant of reproductive success of Tengmalm's owls under fluctuating food conditions

Hakkarainen, Harri; Mykrä, Sakari; Kurki, Sami; Korpimäki, Erkki; Nikula, Ari; Koivunen, Vesa

doi:10.1034/j.1600-0706.2003.11906.x

Cited by 41 publications

(63 citation statements)

References 37 publications

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“…The study area (1,300 km 2 ) mainly consists of coniferous forests (61%) and agricultural Welds and pastures 25% (Hakkarainen et al 2003). The structure of boreal coniferous forests in northern Europe is relatively homogeneous with low tree species diversity, dominated by two conifers, Scots pine (Pinus sylvestris) and Norway spruce (Picea abies).…”

Section: Study Population and Vole Cyclesmentioning

confidence: 99%

“…We measured habitat structure at the territory scale (a radius of 1,000 m from the nest, covering 314 ha). This spatial scale is considered the most relevant for breeding Tengmalm's owls (Hakkarainen et al 2003). In addition, the habitat class percentages at 1,000 m radius were also strongly correlated with those at 2,000 m radius (for all, r > 0.75).…”

Section: Landscape Analysesmentioning

confidence: 99%

“…The landscape data from the year 1991 was thus considered suYcient to describe the habitat structure of owl territories during the study period. Overlap among habitat measurements of territories was small, since mean annual distances between breeding sites were long (2,700-8,800 m; Hakkarainen et al 2003). In some cases, more than one male consecutively used the same nest site.…”

Section: Landscape Analysesmentioning

confidence: 99%

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Survival of male Tengmalm’s owls increases with cover of old forest in their territory

et al. 2007

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The loss and fragmentation of forest habitats have been considered to pose a worldwide threat to the viability of forest-dwelling animals, especially to species that occupy old forests. We investigated whether the annual survival of sedentary male Tengmalm's owls Aegolius funereus was associated with the cover of old coniferous forests in Finland. Survival and recapture probabilities varied annually with density changes in populations of the main prey (Microtus voles). When this variation was controlled for, and relationships between survival and proportions of the three different forest age classes (old-growth, middle-aged, and young) were modeled separately, the old-growth model was the most parsimonious. Survival increased with the cover of old forest, although the extent of old forest within owl territories was relatively small (mean approximately 12%, range 2-37%). This association, however, varied among years and appeared especially in years of increasing vole abundance. At such times, old forests may sustain high populations of bank voles Clethrionomys glareolus, shrews and small passerines. In addition, old forests may serve as refuges against large avian predator species, such as Ural owls Strix uralensis and goshawks Accipiter gentilis. Our results suggest that changes in habitat quality created by agriculture and forestry may have the potential to reduce adult survival, an essential component of fitness and population viability.

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Section: Study Population and Vole Cyclesmentioning

confidence: 99%

Section: Landscape Analysesmentioning

confidence: 99%

Section: Landscape Analysesmentioning

confidence: 99%

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Survival of male Tengmalm’s owls increases with cover of old forest in their territory

et al. 2007

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“…Offspring can be considered the currency for parental fitness [1]. During early development, the offspring of any species are more or less vulnerable and may face a variety of threats, including adverse weather conditions or food shortage [2][3][4][5], infectious diseases and parasites [6][7][8], or interspecific brood parasitism [9,10].…”

Section: Introductionmentioning

confidence: 99%

Parental risk management in relation to offspring defence: bad news for kids

2015

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Do parents defend their offspring whenever necessary, and do self-sacrificing parents really exist? Studies recognized that parent defence is dynamic, mainly depending on the threat predators pose. In this context, parental risk management should consider the threat to themselves and to their offspring. Consequently, the observed defence should be a composite of both risk components. Surprisingly, no study so far has determined the influence of these two threat components on parental decision rules. In a field experiment, we investigated parental risk taking in relation to the threat posed to themselves and their offspring. To disentangle the two threat components, we examined defence behaviours of parent blue tits Cyanistes caeruleus towards three different predators and during different nestling developmental stages. Nest defence strategies in terms of alarm call intensity and nearest predator approach differed between the three predators. Defence intensity was only partly explained by threat level. Most importantly, parental risk management varied in relation to their own, but not offspring risk. Parent defence investment was independent of nestling risk when parents followed a high-risk strategy. However, parents considered nestling as well as parental risk when following a low-risk strategy. Our findings could have general implications for the economy of risk management and decision-making strategies in living beings, including humans.

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“…Old and dense forests provide better protection against predators, as well as greater availability of food (Hakkarainen et al, 2008;Laaksonen et al, 2004). Clearcuts can have positive impact on Tengmalm's owl (Hakkarainen et al, 1996(Hakkarainen et al, , 2003. In Spruce and Pine forests in Finland, the owl pairs, nesting in territories with high (>30%) percentage of clearcut areas and plantations, had more fledglings than areas with less cut areas.…”

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confidence: 99%

From the experience of LIFE+ ManFor C.BD to the Manual of Best Practices in Sustainable Forest Management

et al. 2016

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The Italian Journal of Agronomy (IJA) is the official journal of the Italian Society of Agronomy for the publication of original research papers reporting experimental and theoretical contributions to agronomy and crop science. Typical subjects covered by the IJA include: i) crop physiology, ii) crop production and management, iii) agroclimatology and modelling, iv) plant-soil relationships, v) crop quality and post-harvest physiology, vi) farming and cropping systems, vii) agroecosystems and the environment, viii) agricultural ecology, ix) advances in traditional and innovative crops, x) crop and system modelling. Instructions to AuthorsManuscripts must be submitted online at www.agronomy.it only; do not submit via e-mail or surface mail.Manuscripts must be written in English. Authors whose native language is not English are strongly recommended to have their manuscript checked by a language editing service, or by an English mother-tongue colleague prior to submission. Manuscripts should be saved and submitted as a single WORD file containing the full text, references, tables and figures. In case of acceptance, original text and figures must be provided for publication.Original Articles should normally be divided into an abstract, introduction, materials and methods, results, discussion and references. The abstract should contain a maximum of 400 words. A maximum of 20 authors is permitted, and additional authors should be listed in an ad hoc appendix. Review Articles: no particular format is required for these articles. However, they should have an informative, unstructured abstract of about 250 words. Reviews may also include meta-analyses, guidelines and consensus papers by scientific societies or working groups. These studies must be conducted following proper, widely accepted ad hoc procedures. Short Communications are articles with a simple layout and containing limited data (no more than two figures or tables) and a small number of citations (not more than 25). They should be limited to 2,000 words of text (figure captions, table headings and reference lists are additional to this limit). Letters to the editor should be from 250 to 1,000 words in length. Authors of letters to the editor should provide a short title for their letter.Manuscripts should be double spaced with numbered lines and wide margins and should be arranged as follows. Title page: including the full title, the name(s) of the author(s), their affiliation and the name of the corresponding author to whom proofs and requests for off-prints should be sent. Abstract: should not exceed 400 words. Keywords: three to six keywords characterizing the content of the article in alphabetical order. Introduction: a brief introduction. Materials and methods: this section should provide sufficient information and references on the techniques adopted to permit their replication. Results: the content of this section should permit full comprehension of the data reported in figures and tables. Discussion: this should underline the significance of the resul...

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Habitat composition as a determinant of reproductive success of Tengmalm's owls under fluctuating food conditions

Cited by 41 publications

References 37 publications

Survival of male Tengmalm’s owls increases with cover of old forest in their territory

Survival of male Tengmalm’s owls increases with cover of old forest in their territory

Parental risk management in relation to offspring defence: bad news for kids

From the experience of LIFE+ ManFor C.BD to the Manual of Best Practices in Sustainable Forest Management

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