Search results for "tuhot"

Drivers of Spruce Bark Beetle (Ips typographus) Infestations on Downed Trees after Severe Windthrow

2020

Research Highlights: Bark beetles are important agents of disturbance regimes in temperate forests, and specifically in a connected wind-bark beetle disturbance system. Large-scale windthrows trigger population growth of the European spruce bark beetle (Ips typographus L.) from endemic to epidemic levels, thereby allowing the killing of Norway spruce trees over several consecutive years. Background and Objectives: There is a lack of evidence to differentiate how outbreaks are promoted by the effects of environmental variables versus beetle preferences of trees from endemic to outbreak. However, little is known about how individual downed-tree characteristics and local conditions such as tre…

Transcriptional Upregulation of DNA Damage Response Genes in Bank Voles (Myodes glareolus) Inhabiting the Chernobyl Exclusion Zone

2018

Exposure to ionizing radiation (IR) from radionuclides released into the environment can damage DNA. An expected response to exposure to environmental radionuclides, therefore, is initiation of DNA damage response (DDR) pathways. Increased DNA damage is a characteristic of many organisms exposed to radionuclides but expression of DDR genes of wildlife inhabiting an area contaminated by radionuclides is poorly understood. We quantified expression of five central DDR genes Atm, Mre11, p53, Brca1, and p21 in the livers of the bank vole Myodes glareolus that inhabited areas within the Chernobyl Exclusion Zone (CEZ) that differed in levels of ambient radioactivity, and also from control areas ou…

Weaving the threads of international criminal justice: The double dialogicity of law and politics in the ICC al-Mahdi case

2021

International audience; In this paper, we examine the international criminal trial of Ahmad al-Faqi al-Mahdi, a Malian Islamist who appeared before the International Criminal Court (ICC) in The Hague, charged with the destruction of Islamic shrines during the 2012 jihadist occupation of Timbuktu. Our objective is to analyze the so-called 'al-Mahdi case' as a dialogical network (the destructions occurred in the context of an asynchronous translocal press-mediated exchange between jihadists and the international community) and as an event unfolding at a dialogical site (when the commander responsible for the destructions was referred to the ICC four years later). These two dialogical orders e…

Metsien ennallistamisen vaikutus kaarnakuoriaisten populaatioihin ja metsätuhoriskiin

2008

Estimating Tree Health Decline Caused by Ips typographus L. from UAS RGB Images Using a Deep One-Stage Object Detection Neural Network

2022

Various biotic and abiotic stresses are causing decline in forest health globally. Presently, one of the major biotic stress agents in Europe is the European spruce bark beetle (Ips typographus L.) which is increasingly causing widespread tree mortality in northern latitudes as a consequence of the warming climate. Remote sensing using unoccupied aerial systems (UAS) together with evolving machine learning techniques provide a powerful tool for fast-response monitoring of forest health. The aim of this study was to investigate the performance of a deep one-stage object detection neural network in the detection of damage by I. typographus in Norway spruce trees using UAS RGB images. A Scaled…

Browsing hinders the regeneration of broadleaved trees in uneven-aged forest management in southern Finland

2020

Uneven-aged forest management has attained increasing popularity. It may benefit biodiversity, buffer against pests and abiotic damages, decrease runoff from clearcuts and improve recreational values. We studied how gap cuttings and single-tree selection cuttings influence browsing damage in spruce-dominated forests in south-central Finland. Overall, browsing damage was especially frequent in aspen and rowan, but also in birch. The larger the basal area left in harvesting, the lower the browsing pressure on birch and rowan; neither the harvesting method nor the seedling density had an independent effect on browsing damage. Although larger tree retention levels may reduce browsing damage, th…

Numerical simulations of wind-loaded floating solar panels

2021

Interpreting wind damage risk-how multifunctional forest management impacts standing timber at risk of wind felling

2022

AbstractLandscape multifunctionality, a widely accepted challenge for boreal forests, aims to simultaneously provide timber, non-timber ecosystem services, and shelter for biodiversity. However, multifunctionality requires the use of novel forest management regimes optimally combined over the landscape, and an increased share of sets asides. It remains unclear how this combination will shape stand vulnerability to wind disturbances and exposed timber volume. We combined forest growth simulations and multi-objective optimization to create alternative landscape level forest management scenarios. Management choices were restricted to 1) rotation forestry, 2) continuous cover forestry, and 3) a…

Huumori kukoistaa sodan alla Ukrainassa

2022

Ukrainalaiset kokoontuvat sodan keskellä nauramaan stand up -klubeille. Huumori muistuttaa tarpeettoman kuoleman ja tuhon mielettömyydestä, mutta samalla myös toivosta. nonPeerReviewed

Hurrikaanien pitkät jäljet

2022

Suomalainen media keskittyy hurrikaaneja koskevassa uutisoinnissaan listaamaan kulloinkin Yhdysvalloissa maihin iskeneen hurrikaanin kuolonuhrien ja taloudellisten tuhojen määrää. Tällainen uutisointi voi pahimmillaan irrottaa hurrikaanit niiden laajemmista yhteiskunnallisista vaikutuksista. nonPeerReviewed