0000000001099741
AUTHOR
Veli Saari
Voimajohtoaukeiden raivauksen merkitys soiden päiväperhosille ja kasvillisuudelle
The role of power line rights-of-way as an alternative habitat for declined mire butterflies
Habitat loss is one of the greatest threats for biodiversity. In Finland, two thirds of natural mires have been drained for silviculture, which transforms open wetlands into dense forests. However, vegetation management of power line rights-of-way (ROW) maintain the drained mires as open areas. The aim of this study was to determine the effect of the power line ROW vegetation management on butterfly abundance, species richness and community structure by comparing the managed power line ROWs to unmanaged drained control sites and to natural mires. The species richness or abundance of mire butterflies did not differ between the power line ROWs and natural mires. In contrast, both species rich…
Species richness and abundance of butterflies in natural and drained mires in Finland
[Introduction] Approximately half of Finnish peatlands have been drained for forestry. However, there is considerable variation regionally, and in particular in southern southern half of Finland ca 80-90 % of the original mire area has been ditched. Drainage was most intensive in 1960s and 1970s, but ditching has gradually decreased since that. Drainage has extensive effects on flora and fauna of mire habitats (Laine & al. 1995b, Aapala & Lappalainen 1998a, Aapala & Lappalainen 1998b, Vasander 1998, Heikkilä & al. 2002). Restoration of drained mires has began relatively recently and the research based knowledge of the ecological effects of the restoration are still forthcoming. Nevertheless…
Vegetation Change in Peatland Buffers as an Indicator of Active Areas of Run-On from Forestry
Our aim in this study was to evaluate whether coverage change in the vegetation of a forestry buffer wetland can be used to reveal a possible increase in nutrients. To achieve this, we followed changes in vegetation on two peatland buffers, and biomass with nitrogen content in one of them. Nutrient concentrations were periodically lower in the water inflow than in the outflow. Flooding caused a species change in favor of flood-tolerant grasses and Sphagna, but this species composition did not indicate a higher trophic level. Nitrogen content in the reference site's original surface peat layer, which was rich in woody remains, was higher than that of the newly formed, more acidic Sphagnum pe…
A check-list of the larger fungi of Central Finland
Altogether 1166 taxa are reported from Central Finland. The check-list includes 678 Agaricales, Boletales and Russulales, 266 Aphyllophorales, 10 Tremellales and Dacrymycetales, 19 Gasteromycetes, 138 Ascomycotina and 55 Myxomycota. The locality of each species is presented by indicating the municipality. The main distributional groups and the threatened fungi in Central Finland are discussed. Twenty species belong to different threat categories in Finland. Geastrum triplex and Piptoporus pseudobetulinus are endangered and Haploporus odorus and Polyporus umbellatus vulnerable.
Population Persistence and Offspring Fitness in the Rare Bellflower Campanula Cervicaria in Relation to Population Size and Habitat Quality
Data from several animal species and a few plant species indicate that small populations face an elevated risk of extinction. Plants are still underrepresented in these studies concerning the relation between population size and persistence. We studied the effect of population size on persistence among natural popu- lations of the rare bellflower Campanula cervicaria in Finland. We monitored 52 bellflower populations for 8 years and found that the mean population size decreased from 24 to 14 during this period. Small popula- tions with # 5 individuals were more prone to losing all fertile plants than were larger ones. Reduction in population size was nevertheless unrelated to the degree of …