Current issue: 58(4)

Scopus CiteScore 2023: 3.5
Scopus ranking of open access forestry journals: 17th
PlanS compliant
Select issue
Silva Fennica 1926-1997
1990-1997
1980-1989
1970-1979
1960-1969
Acta Forestalia Fennica
1953-1968
1933-1952
1913-1932

Articles containing the keyword 'insects'

Category : Article

article id 5576, category Article
Matti Nuorteva, Lennart Saari. (1996). Winter ecology of a female White-backed Woodpecker Dendrocopos leucotos (Bechstein). Silva Fennica vol. 30 no. 1 article id 5576. https://doi.org/10.14214/sf.a9221
Keywords: winter food; Dendrocopos leucotos; white-backed woodpecker; prey insects; sawflies
Abstract | View details | Full text in PDF | Author Info

In the winter of 1977/78, a White-backed Woodpecker (Dendrocopos leucotos Bechstein) was observed in the archipelago of southwestern Finland 200 km from its breeding areas. It foraged on insects living in mall dead alder and birches. The potential prey species were identified by rearing the insects from the trunks used by the White-backed Woodpecker. Altogether 628 adult insects emerged. In addition to the big larvae the potential food also included larvae of Sciaridae and Cecidomyidae (Diptera) living in dense clumps.

  • Nuorteva, E-mail: mn@mm.unknown (email)
  • Saari, E-mail: ls@mm.unknown
article id 5245, category Article
Pekka Helle, Jyrki Muona. (1985). Invertebrate numbers in edges between clearfellings and mature forests in Northern Finland. Silva Fennica vol. 19 no. 3 article id 5245. https://doi.org/10.14214/sf.a15424
Keywords: Coleoptera; insects; Formicidae; vertebrate; crear-fellings; forest edges; Homoptera; Diptera; Gastropoda; Hymenoptera; Arachnida; biotopes
Abstract | View details | Full text in PDF | Author Info

The abundance of main invertebrate groups was studied in clear-fellings, forests and in edges between them in Northern Finland in June-August 1983. Five trapping transects were used. Each transect had 48 pitfall traps and 16 window traps on the ground and 4-6 window traps in bushes or trees.

Invertebrate groups Homoptera, Diptera, Formicidae, Coleoptera and Gastropoda were more abundant in forest than in clear-cuts according to the pitfall data. In window traps the catches of all the main groups were larger in the forest side. Six out of the eight most important groups preferred the edge in pitfall data. Formicidae, other Hymenoptera, Arachnida and Gastropoda were more numerous in the edges than in the interior habitats in both sides of the edge. In window trap material no consistent edge preference was found in clear-fellings, but in the forest side it was evident. Coleoptera and Arachnida preferred the edge on both sides of it.

The variations in the catches of the invertebrate groups were studied by regression analyses. Independent variables used were the distance to the edge, the coverage of mosses, litter, mineral soil, grasses and sedges, herbs and the density of saplings. The percentage of variance explained in multiple regression analyses were highest for the group of other Hymenoptera and Arachnida and lowest for Coleoptera and Homoptera. As regards the explanation power of the independent variables the distance to the edge and the density of saplings clearly exceeded the others.

The results support the assumption that the breeding bird densities at forest edges, which is often high, may depend on high prey density there.

The PDF includes a summary in Finnish.

  • Helle, E-mail: ph@mm.unknown (email)
  • Muona, E-mail: jm@mm.unknown
article id 4736, category Article
Matti Nuorteva. (1967). Hakkuutähteissä elävien hyönteisten käyttömahdollisuuksista hakkuun ajankohdan määrittämisessä. Silva Fennica vol. 1 no. 1 article id 4736. https://doi.org/10.14214/sf.a14446
English title: Potential in using determination of insect species breeding in the logging residue to estimate the time of the logging.
Original keywords: kuusi; mänty; korjuuajankohta; hakkuun ajankohta; hakkuutähteet; hyönteiset; kaarnakuoriaiset
English keywords: bark beetles; Norway spruce; insects; Scots pine; logging time; timing of felling; logging residue
Abstract | View details | Full text in PDF | Author Info

Degree of decomposition of logging residue, and decay in stumps have been used in forest inventories to estimate the time of the felling. In this paper, a method was developed to use insects breeding in the logging residue to determine how long ago the felling took place. The method is based on the arrival and rate of development of the different species of bark beetles that breed in the logging residue.

The most suitable insect species to be used in the purpose of timing the age of logging residue were defined, and their occurrence in different tree species and fellings performed at different times of the year were described. The species can be easily identified by gallery systems characteristic to the species.

It is concluded that the method does not suit for broadleaved species, because there is no common insects suitable for this purpose. Also, the time of swarming of the insects depends on the weather conditions in the spring, which makes it difficult to give definite dateshe progress of the spring has to be taken into account when the occurrence of the insects is used in the determination of the time of the felling. In addition, local conditions, such as shading, affect drying of the branches, and can influence the occurrence of the insects. For Scots pine and Norway spruce the age of the logging residue can be determined precisely only at most two years back.

  • Nuorteva, E-mail: mn@mm.unknown (email)

Category : Article

article id 7435, category Article
Esko Kangas. (1954). On the possibility of pests being conveyed in export timber : survey of biological requirements. Acta Forestalia Fennica vol. 61 no. 23 article id 7435. https://doi.org/10.14214/aff.7435
Keywords: insects; timber transport; timber import; timber export; pests; plant protection; conveying of pests; plant protection regulations
Abstract | View details | Full text in PDF | Author Info

Many countries have enacted plant protection laws or statutes that consist timber imported into a country, both raw wood and processed timber. This has caused some inconvenience to the international timber trade. Necessary protection against the spread of pests via export is fully acceptable, but the protection should be based on actual need.
When considering processed or barked raw timber, the problem concerns only species that pass their development in the wood. The four most important biological requirements affecting the risk are 1) the tree species of the importing country and affinity of the pest, 2) climatic conditions of the importing country and the pest’s range and adaptability to the climate, 3) biological factors regulating the population, and 4) suitability of the individual development of the pest for transmission. These risks are discussed in the article.

It is concluded that it is possible largely to eliminate the species that might be conveyed via export timber. It is often possible to decide in advance what danger threatens the importing country from species that might be conveyed via export timber. This would make it possible to adapt plant protection regulations to suit the relation between the exporting and importing countries.

The Acta Forestalia Fennica issue 61 was published in honour of professor Eino Saari’s 60th birthday.

  • Kangas, E-mail: ek@mm.unknown (email)
article id 7304, category Article
Uunio Saalas. (1934). Suomalaisista hyönteisnimistä. Acta Forestalia Fennica vol. 40 no. 27 article id 7304. https://doi.org/10.14214/aff.7304
English title: The Finnish nomenclature of insects.
Original keywords: hyönteiset; metsähyönteiset; nimistö; nimistökomitea
English keywords: nomenclature; forest insects
Abstract | View details | Full text in PDF | Author Info

The need for standard Finnish names for the harmful or beneficial insects in agriculture rose in the 1930s, and a committee was formed in 1932 to work out nomenclature for the insect species. In 1933, a similar committee was formed to compile a nomenclature for forest insects. The old popular names, if such names existed, were used primarily. Some of the insects had been named also in the earlier literature, even if all the names had not been taken in common use. Some names were translated from the scientific names. Emphasis was given to the habits or habitats of the insect. An attempt was made to shorten the former names if needed.

The PDF includes a summary in English.

  • Saalas, E-mail: us@mm.unknown (email)
article id 7636, category Article
Kari Heliövaara, Rauno Väisänen. (1984). Effects of modern forestry on Northwestern European forest invertebrates: a synthesis. Acta Forestalia Fennica no. 189 article id 7636. https://doi.org/10.14214/aff.7636
Keywords: forest fires; forest management; insects; forestry; intensive silviculture; Scandinavia; forest invertebrates; primeval forests; changes in boreal forest dynamics
Abstract | View details | Full text in PDF | Author Info

The effects of modern forestry on northwest European forest invertebrates are summarized and analysed mainly on the basis of published literature. The direct influence of different practices including clear-cutting, thinning, burning-over, ploughing, changes in tree species composition of stands, fertilization, insecticides, pheromones and biological control are discussed from a forest zoological point of view. Also, the indirect effects of general changes in boreal forest dynamics, loss of primeval forests, cessation of natural fires and the dominance of young stands are described. The direct effects of different silvicultural practices on the species composition and diversity of forest invertebrates are usually considered to be striking but transient. However, when large areas are treated, the species associated with primeval forests, especially with the wood composition system in them, as well as the species associated with fires, seem to have drastically declined. In northwest Europe, efficient forestry has not caused such serious pest problems as is known from tropical countries or North America.

The PDF includes a summary in Finnish.

  • Heliövaara, E-mail: kh@mm.unknown (email)
  • Väisänen, E-mail: rv@mm.unknown

Category : Research article

article id 86, category Research article
Mats Jonsell, Jesper Hansson. (2011). Logs and stumps in clearcuts support similar saproxylic beetle diversity: implications for bioenergy harvest. Silva Fennica vol. 45 no. 5 article id 86. https://doi.org/10.14214/sf.86
Keywords: biodiversity; beetles; bioenergy; Coleoptera; logs; insects; stumps
Abstract | View details | Full text in PDF | Author Info
Stumps from clear cuts are increasingly used for bioenergy. Extracting this wood will reduce the habitat available for saproxylic (wood-living) organisms. As little is known about the species assemblages that will be affected, we investigated the diversity of saproxylic beetles in stumps on clear-felled sites and as a reference, we compared it with the diversity in downed logs. Stumps and logs of aspen (Populus tremula L.), birch (Betula pubescens Ehrh. and B. verrucosa Ehrh.[syn. B. pendula Roth]), spruce (Picea abies (L.) Karst.) and pine (Pinus sylvestris L.) were examined in clear cuts of two different ages: one summer old and 4–5 years old. The beetles were sampled by sieving bark (0.25 m2) peeled from the wood. The samples were taken in pairs of one log and one stump situated close together and of the same tree species, age since death and diameter. In total 3348 saproxylic beetles belonging to 124 species were found in 176 samples. The stumps had a similar number of species to the logs both as measured per sample and as an accumulated number. Exceptions were 4–5 years old wood of birch and pine where the number was significantly higher in the stumps. The number of red-listed species was also similar between stumps and logs. Species composition was more different between the stumps and logs of conifers than of deciduous trees. We conclude that clear-felled stumps have a diverse saproxylic insect fauna. This has to be taken into account if large scale extraction of logging stumps is implemented.
  • Jonsell, Swedish University of Agrarian Sciences, Dept of Ecology, Uppsala, Sweden E-mail: mats.jonsell@ekol.slu.se (email)
  • Hansson, Swedish University of Agrarian Sciences, Dept of Ecology, Uppsala, Sweden E-mail: jh@nn.se
article id 469, category Research article
Henri Vanhanen, Timo O. Veteli, Sonja Päivinen, Seppo Kellomäki, Pekka Niemelä. (2007). Climate change and range shifts in two insect defoliators: gypsy moth and nun moth – a model study. Silva Fennica vol. 41 no. 4 article id 469. https://doi.org/10.14214/sf.469
Keywords: insects; forest pests; CLIMEX; Lymantria monacha; Lymantria dispar; poleward shift; geographical range
Abstract | View details | Full text in PDF | Author Info
Environmental factors influenced by global climate change determine the distribution ranges of organisms. Especially ectothermic animals are expected to shift their distribution ranges northwards in the next hundred years or so. In this study simulations made with CLIMEX-modelling software were used to predict the future distribution ranges of two Central European serious forest pest species: the nun moth (Lymantria monacha L. (Lepidoptera: Lymantriidae)) and the gypsy moth (L. dispar L). The software calculates an ecoclimatic index based on the life cycle requirements of a species and thus represents the probability of a viable population to exist at a certain location. Three different climate warming scenarios were considered: temperature increase of 1.4, 3.6 and 5.8°C. Simulations generated with the current climate conditions corresponded well to the current distributions of the species. The climate warming scenarios shifted the northern boundary of the distribution for both of these species north by c. a. 500–700 km. Also the southern edge of the ranges retracted northwards by 100–900 km. The results of this study are in agreement with the results of empirical studies on other species. Being serious pest species, these species pose a potential threat to silviculture and therefore, have to be considered in the planning of forest management practices.
  • Vanhanen, Faculty of Forestry, University of Joensuu, P.O.B. 111, FI-80101 Joensuu, Finland E-mail: hv@nn.fi
  • Veteli, Faculty of Biosciences, University of Joensuu, P.O.B. 111, FI-80101, Joensuu, Finland E-mail: timo.veteli@joensuu.fi (email)
  • Päivinen, Faculty of Forestry, University of Joensuu, P.O.B. 111, FI-80101 Joensuu, Finland E-mail: sp@nn.fi
  • Kellomäki, Faculty of Forestry, University of Joensuu, P.O.B. 111, FI-80101 Joensuu, Finland E-mail: sk@nn.fi
  • Niemelä, Faculty of Forestry, University of Joensuu, P.O.B. 111, FI-80101 Joensuu, Finland E-mail: pn@nn.fi

Category : Review article

article id 24021, category Review article
Eva Ring, Märtha Wallgren, Erland Mårald, Per Westerfelt, Line Djupström, Aron Davidsson, Johan Sonesson. (2024). Forest roads in Sweden – infrastructure with multiple uses and diverse impacts. Silva Fennica vol. 58 no. 4 article id 24021. https://doi.org/10.14214/sf.24021
Keywords: insects; forestry; recreation; reindeer; water; plants; wildlife
Highlights: The extensive network of forest roads in Sweden facilitates both forestry transportation and other activities including recreation, berry-picking, hunting, tourism, and firefighting; The multiple uses of roads can lead to conflicts when the interests between stakeholders and forest owners collide; Despite its extent, research into the social, ecological, and environmental consequences of Sweden’s forest road network is limited.
Abstract | Full text in HTML | Full text in PDF | Author Info

Since the 1950s, more than 200 000 km of roads have been built in Sweden’s forests, making them easily accessible and open to multiple uses. The aim of this study was to review the impacts of forest roads in Sweden from a broad perspective encompassing social, ecological, and environmental factors. The Swedish case is interesting because it has an extensive network of permanent forest roads which were built primarily for forestry-related transportation but are currently used by many other stakeholders for many different purposes. Forest roads not only facilitate transportation of wood, machinery, personnel, and equipment into and out of the forest but also enable emergency response to wildfires and support berry and mushroom picking, hunting, recreation, tourism, and access to second homes. The roads increase the opportunities for members of the public to experience forests in various ways. Conflicts arise when different interests collide, for example when the interests of the forest owner clash with those of commercial berry-picking companies, tourism entrepreneurs, or reindeer (Rangifer tarandus L.) herding. Forest roads may have ecological impacts such as barrier and disturbance effects, fragmentation or loss of habitats, altering fauna movement patterns, and changing the composition of plant and insect species. The environmental impacts of forest roads relate to, among other things, hydrology, water quality, and erosion. Predicted changes in the climate are likely to place new demands on Swedish forest roads but, despite their extent, this review shows that there is only a small amount of rather fragmented research on their social, ecological, and environmental consequences. Overall, few studies appear to cover both social and ecological/environmental factors and their interactions, either in Sweden or elsewhere. This review provides examples of such interactions in the case of Sweden, and suggests that more research into these and the specific social, ecological, and environmental factors involved is warranted.

  • Ring, Skogforsk (The Forestry Research Institute of Sweden), Uppsala Science Park, 751 83 Uppsala, Sweden ORCID https://orcid.org/0000-0002-8962-9811 E-mail: eva.ring@skogforsk.se (email)
  • Wallgren, Skogforsk (The Forestry Research Institute of Sweden), Uppsala Science Park, 751 83 Uppsala, Sweden; Swedish University of Agricultural Sciences, Department of Wildlife, Fish, and Environmental Studies, 907 36 Umeå, Sweden ORCID https://orcid.org/0000-0002-3172-4496 E-mail: martha.wallgren@skogforsk.se
  • Mårald, Umeå University, Department of Historical. Philosophical and Religious Studies, 901 87 Umeå, Sweden ORCID https://orcid.org/0000-0002-2291-9910 E-mail: erland.marald@umu.se
  • Westerfelt, Skogforsk (The Forestry Research Institute of Sweden), Uppsala Science Park, 751 83 Uppsala, Sweden ORCID https://orcid.org/0000-0003-2040-8305 E-mail: per.westerfelt@skogforsk.se
  • Djupström, Skogforsk (The Forestry Research Institute of Sweden), Uppsala Science Park, 751 83 Uppsala, Sweden; Swedish University of Agricultural Sciences, Department of Wildlife, Fish, and Environmental Studies, 907 36 Umeå, Sweden ORCID https://orcid.org/0000-0003-4536-7765 E-mail: line.djupstrom@skogforsk.se
  • Davidsson, Skogforsk (The Forestry Research Institute of Sweden), Uppsala Science Park, 751 83 Uppsala, Sweden ORCID https://orcid.org/0009-0007-2736-8656 E-mail: Aron.davidsson@skogforsk.se
  • Sonesson, Skogforsk (The Forestry Research Institute of Sweden), Uppsala Science Park, 751 83 Uppsala, Sweden ORCID https://orcid.org/0000-0002-2018-7496 E-mail: Johan.sonesson@skogforsk.se

Register
Click this link to register to Silva Fennica.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content
Your selected articles