Search results for "Mire"

Dabas liegums "Melnā ezera purvs"

2011

Melnā ezera purva veidošanās, biotopi, augi un dzīvnieki.

Conservation and management of proirity wetland habitats in Latvia LIFE - wetlands LIFE 13 NAT/LV/000578

2016

Poster: 25th conference of European Vegetation Survey, 6-10 April, 2016, Rome, Italy

Optimal timing of power line rights-of-ways management for the conservation of butterflies

2012

Habitat loss, fragmentation, and degradation are the main threats to biodiversity. Human activities also create new habitat types that might fulfil ecological requirements for a variety of species. This study investigates whether the vegetation clearing (=shrub and tree cutting) on drained mire patches on power line rights-of-ways (ROWs) keep plant communities in an early successional stage and thus provide habitats for mire specialist and non-mire butterflies. It was further studied what would be the optimal clearing interval in terms of butterfly species richness and abundance. The results show that tree height, especially the height of birch, increases linearly over the 7-year period fol…

Last Millennium hydro-climate variability in Central–Eastern Europe (Northern Carpathians, Romania)

2015

Proxy-based reconstructions of climate variability over the last millennium provide important insights for understanding current climate change within a long-term context. Past hydrological changes are particularly difficult to reconstruct, yet rainfall patterns and variability are among the most critical environmental variables. Ombrotrophic bogs, entirely dependent on water from precipitation and sensitive to changes in the balance between precipitation and evapotranspiration, are highly suitable for such hydro-climate reconstructions. We present a multi-proxy analysis (testate amoebae, plant macrofossils, stable carbon isotopes in Sphagnum, pollen, spores and macroscopic charcoal) from …

Classification of European bog vegetation of the Oxycocco-Sphagnetea class

2022

Aims: Classification of European bog vegetation (Oxycocco-Sphagnetea class); identification of diagnostic species for the class and vegetation subgroups (orders and alliances); development of an expert system for automatic classification of vegetation plots; and production of distribution maps of the Oxycocco-Sphagnetea class and its alliances. Location: Europe. Methods: A data set of vegetation-plot records was compiled to include various bog types over most of the European continent. An unsupervised classification (beta-flexible linkage method, Sørensen distance measure) and detrended correspondence analysis (DCA) ordination were applied. Formal definitions of syntaxa based on species pre…

The effect of peatland drainage and restoration on Odonata species richness and abundance

2015

Background Restoration aims at reversing the trend of habitat degradation, the major threat to biodiversity. In Finland, more than half of the original peatland area has been drained, and during recent years, restoration of some of the drained peatlands has been accomplished. Short-term effects of the restoration on peatland hydrology, chemistry and vegetation are promising but little is known about how other species groups apart from vascular plants and bryophytes respond to restoration efforts. Results Here, we studied how abundance and species richness of Odonata (dragonflies and damselflies) respond to restoration. We sampled larvae in three sites (restored, drained, pristine) on each o…

The role of power line rights-of-way as an alternative habitat for declined mire butterflies

2011

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…

No evidence of systematic pre-emptive loggings after notifying landowners of their lands’ conservation potential

2020

Landowners can intentionally impair biodiversity values occurring on their land to pre-empt biodiversity protection. This often leads to significant negative effects on biodiversity. We studied whether landowners in Finland engaged in pre-emptive loggings after they were notified that their wooded mires are candidate sites for a mire protection program. After the notification, harvesting rates of the candidate wooded mires were significantly lower compared to harvesting rates of similar but non-candidate wooded mires. Annual and monthly harvesting rates indicated that notifying landowners of the conservation potential did not launch systematic pre-emptive logging behavior. Nevertheless, par…

l'organizzazione del dipartimento di salute mentale

2007

Dehlorānu grupas savienojumu noteikšana pārtikas produktos ar gāzu hromatogrāfiju – augstas izšķirtspējas masspektrometriju

2017

Dehlorānu grupas savienojumu noteikšana pārtikas produktos ar gāzu hromatogrāfiju-augstas izšķirtspējas masspektrometriju. Ozoliņa M., zinātniskie vadītāji doktorante Mg.ķīm Rjabova J., Dr.ķīm., prof. Vīksna A. Bakalaura darbs, 38 lappuses, 3 attēli, 10 tabulas, 37 literatūras avoti, 1 pielikums. Latviešu valodā. Darbā ir apkopota literatūra par dehlorānu grupas savienojumiem, to īpašībām un izmantošanu. Ir apskatīta to izplatība apkārtējā vidē un toksiskums. Literatūras apskatā ir pārskats par dehlorānu noteikšanā izmantojamām ekstrakcijas, attīrīšanas un analīzes metodēm. Eksperimentālajā daļā ir noteikta dehlorānu koncentrācija 69 pārtikas produktu paraugos izmantojot gāzu hromatogrāfiju…