Search results for "taiga"
showing 10 items of 103 documents
Oribatid mites (Acari: Oribatida) in boreal forest floor and decaying wood
2008
Summary We studied the oribatid mite communities in forest floor and in decaying wood in pine (Pinus sylvestris), spruce (Picea abies) and deciduous (mainly Betula pendula and B. pubescens) forests at different latitudes in Finland. The study sites were either in mature managed forests or in old-growth forests in nature reserves. Altogether 78 sites were sampled in 2004 and 2005, yielding a total of 38,145 oribatid mites belonging to 133 species, of which four were new to Finland. Oribatid mite communities differed in terms of total number and community structure between forest types and latitudes within the boreal forest zone. The most abundant and diverse communities were in spruce forest…
Building and evaluating predictive occupancy models for the Siberian flying squirrel using forest planning data
2005
Abstract We analyzed the applicability of forest planning data in predicting the occurrence of the Siberian flying squirrel (Pteromys volans) in managed northern boreal forests, in northeast Finland. Forest planning data is a source of information about forest characteristics for forest managers that may be used in estimating the availability of certain habitats for species conservation. Flying squirrel populations have declined in Finland, most probably due to habitat change and loss and maintenance of suitable habitats can be seen as a fundamental task in species conservation. First, we surveyed 715 ha of older spruce-dominated forest consisting of 91 stands, of which 35 were found occupi…
Hotspots in cold climate: Conservation value of woodland key habitats in boreal forests
2011
The concept of Woodland Key Habitats (WKH, small-scaled presumed hotspots of biodiversity) has become an essential component of biodiversity conservation in Fennoscandian and Baltic forests. There have been debates over the importance of WKHs in relation to the conservation of biodiversity in production forests. We applied a systematic review protocol and meta-analysis to summarize knowledge on comparisons of biodiversity qualities, such as dead wood and species richness, between WKHs and production forests in relevant countries. We also summarized the knowledge on the impact of edge effects by comparing WKHs surrounded by production forests to WKHs surrounded by clear cuts. Studies had bee…
The preferences of saproxylic beetle species for different dead wood types created in forest restoration treatments
2010
Restoration by imitating natural disturbances is widely practised in boreal forests to increase the availability of habitats for specialized species. We studied the abundance and species richness of saproxylic beetles on different types of created dead wood during 2 years after restoration. The study was conducted on areas of a large-scale experiment in which Norway spruce ( Picea abies (L.) Karst.) forests were restored by controlled burning and partial harvesting with down wood retention in southern Finland. More beetle species were attracted to spruces than to birches and more species were attracted to burnt trees than to unburnt trees killed by girdling. Birch-living species consistent…
Disentangling the effects of area, energy and habitat heterogeneity on boreal forest bird species richness in protected areas
2009
Aim One of the few general laws in ecology is that species richness is a positive function of area. However, it has been proposed that area would merely be a proxy for energy. Additionally, habitat heterogeneity has been found to be an important factor determining species richness. Yet the relative importance of those relationships is little known, and it is still unclear how they are brought about. We aimed to dissect which factors drive the species richness of boreal forest birds, and to identify the most probable mechanisms. Location Forested protected areas in Finland. Methods Using bird line census data collected in 104 protected areas, we ran simultaneous autoregressive models to e…
Water mites of small boreal forest lakes (Central Finland)
1999
The water mite fauna of 10 small forest lakes in close proximity to each other was studied in 1979–1985. In total approximately 62 species of water mites belonging to 22 genera were detected in the lakes. The most diverse genera were Piona (14 species), Arrenurus (11), Unionicola (4) and Limnesia (4). Widely spread and abundant species were Piona variabilis and Limnesia maculata. Locally abundant were Unionicola crassipes, U. minor, Piona carnea and P. paucipora. Zoogeographically interesting though accidental species were Arrenurus werestschagini, Limnesia polonica, Momonia karelica, Piona gyrophora and Unionicola parvipora. Considerable spatial and seasonal differences were observed in th…
Izziņas prasmju sekmēšana rīta pastaigas laikā pirmsskolas izglītības 3.posmā
2022
Darba autore: Baiba Alberga Darba tēma: Izziņas prasmju sekmēšana rīta pastaigas laikā pirmsskolas izglītības 3.posmā. Pētījuma mērķis: izpētīt pirmsskolas izglītības 3.vecuma posma bērnu izziņas prasmju sekmēšanu rīta pastaigas laikā. Darba teorētiskajā daļā tika analizēta un pētīta informācija par pirmsskolas izglītību un tās mērķiem attiecīgajā vecuma posmā, izziņas jeb kognitīvajiem procesiem, rīta pastaigu kā organizācija formu pirmsskolā, nodarbību organizēšanu āra vidē un rotaļu nozīmi pirmsskolā. Darbā ir aprakstīti rīta pastaigas kā organizācijas formas pirmsskolā pieci galvenie uzdevumi – darbs dabā, kustību rotaļa / aktivitāte, vērojums, eksperiments un brīvā aktivitāte. Katrs no…
Polychlorinated biphenyls (PCBs) in soils of the Moscow region: Concentrations and small-scale distribution along an urban–rural transect
2006
In soils of the Moscow region, we examined PCB concentrations in bulk samples and aggregate fractions. Topsoils under grassland and forest at five locations along a southeast-bound transect from Moscow and at a northeastern background location (grassland only) were analysed. We collected aggregates1 cm and fractionated them into interior and exterior portions and also analysed the remaining soil without the aggregates1 cm. The concentrations of the sum of 17 PCBs (sigma17PCBs) in 35 bulk soil samples ranged from 3.1 to 42 microg kg(-1). This was 48-61% of the sigma33PCBs determined in 23 selected samples. The congeners 138(+158), 101 and 52 were most abundant. All PCB concentrations and the…
5-6 gadīgu bērnu kustību pilnveide pastaigās
2021
Autores Ineses Bebrišas kvalifikācijas darba tēma ir “5-6 gadīgu bērnu kustību pilnveide pastaigās”. Tā mērķis ir analizēt, pētīt un praktiski pārbaudīt 5-6 gadīgu bērnu kustību pilnveides iespējas pastaigas laikā. Darba teorētiskajā daļā analizēta literatūra par kustību nozīmi bērnu attīstības procesā un pastaigu organizēšanas nozīmi kustību pilnveides procesā. Darba teorētiskais pamatojums balstās uz projekta Skola2030 un tādu autoru atziņām kā L. Ū. Dālgrēns, A. Ščepanskis, R. Karlovska, J.Smiltiņa u.c. Darba empīriskajā daļā sniegts ieskats, kā tiek veidota pedagoģiskā darbība kustību pilnveidei pastaigu laikā, tika novērtēti bērni 5 – 6 gadu vecumā, pēc sešiem noteiktiem kritērijiem, i…
First measurements of reactive α-dicarbonyl concentrations on PM2.5 aerosol over the Boreal forest in Finland during HUMPPA-COPEC 2010 – source…
2012
The first dataset for summertime boreal forest concentrations of two atmospherically relevant α-dicarbonyl compounds, glyoxal (Gly) and methylglyoxal (Mgly) on PM2.5 aerosol was obtained during the HUMPPA-COPEC-2010 field measurement intensive in Hyytiälä, Finland. Anthropogenic influences over the course of the campaign were identified using trace gas signatures and aerosol particle chemical composition analysis. The data evaluation allowed the identification of different events such as urban pollution plumes, biomass burning and sawmill emissions as sources of high Gly and Mgly concentrations. Mean aerosol concentrations during periods of biogenic influence were 0.81 ng m−3 for Gly and 0.…