9 Works

Multiple drivers of large‐scale lichen decline in boreal forest canopies

Per-Anders Esseen, Magnus Ekström, Anton Grafström, Bengt Gunnar Jonsson, Kristin Palmqvist, Bertil Westerlund & Göran Ståhl
Thin, hair-like lichens (Alectoria, Bryoria, Usnea) form conspicuous epiphyte communities across the boreal biome. These poikilohydric organisms provide important ecosystem functions and are useful indicators of global change. We analyse how environmental drivers influence changes in occurrence and length of these lichens on Norway spruce (Picea abies) over 10 years in managed forests in Sweden using data from >6000 trees. Alectoria and Usnea showed strong declines in southern-central regions, whereas Bryoria declined in northern regions....

Data from: Impacts of dead-wood manipulation on the biodiversity of temperate and boreal forests - A systematic review

Jennie Sandström, Claes Bernes, Kaisa Junninen, Asko Lohmus, Ellen Macdonald, Jörg Müller & Bengt Gunnar Jonsson
Dead wood (DW) provides critical habitat for thousands of species in forests, but its amount, quality and diversity have been heavily reduced by forestry. Therefore, interventions aiming to increase DW might be necessary to support its associated biodiversity, even in protected forests, which may be former production forests. Our aim was to synthesise the current state of knowledge drawn from replicated experimental studies into solid quantitative evidence of the effects of DW manipulation on forest...

Data from: Edge influence on vegetation at natural and anthropogenic edges of boreal forests in Canada and Fennoscandia

Karen A. Harper, S. Ellen Macdonald, Michael S. Mayerhofer, Shekhar R. Biswas, Per-Anders Esseen, Kristoffer Hylander, Katherine J. Stewart, Azim U. Mallik, Pierre Drapeau, Bengt-Gunnar Jonsson, Daniel Lesieur, Jari Kouki & Yves Bergeron
1. Although anthropogenic edges are an important consequence of timber harvesting, edges due to natural disturbances or landscape heterogeneity are also common. Forest edges have been well-studied in temperate and tropical forests, but less so in less productive, disturbance-adapted boreal forests. 2. We synthesized data on forest vegetation at edges of boreal forests and compared edge influence among edge types (fire, cut, lake/wetland; old vs. young), forest types (broadleaf vs. coniferous) and geographic regions. Our...

Data from: Estimating density from presence/absence data in clustered populations

Magnus Ekström, Saskia Sandring, Anton Grafström, Per-Anders Esseen, Bengt Gunnar Jonsson & Göran Ståhl
1. Inventories of plant populations are fundamental in ecological research and monitoring, but such surveys are often prone to field assessment errors. Presence/absence (P/A) sampling may have advantages over plant cover assessments for reducing such errors. However, the linking between P/A data and plant density depends on model assumptions for plant spatial distributions. Previous studies have shown, for example, how that plant density can be estimated under Poisson model assumptions on the plant locations. In...

The prevalence, severity and chronicity of abuse towards older men: insights from a multinational European survey

Maria Gabriella Melchiorre, Mirko Di Rosa & Joaquim J. F. Soares
Data come from: the main study “ABUEL” (ELder ABUse: A multinational prevalence survey), regarding on the whole a sample of 4,467 not demented randomly selected individuals aged 60-84 years (males and females). It was a multinational and cross-sectional prevalence survey on elder abuse, which in 2009 was conducted by face-to-face interviews to older people in seven urban European cities (Ancona, in Italy; Athens, in Greece; Granada, in Spain; Kaunas, in Lithuania; Stuttgart, in Germany; Porto,...

Data from: Informative plot sizes in presence-absence sampling of forest floor vegetation

Göran Ståhl, Magnus Ekström, Jonas Dahlgren, Per-Anders Esseen, Anton Grafström & Bengt-Gunnar Jonsson
1. Plant communities are attracting increased interest in connection with forest and landscape inventories due to society’s interest in ecosystem services. However, the acquisition of accurate information about plant communities poses several methodological challenges. Here we investigate the use of presence-absence sampling with the aim to monitor state and change of plant density. We study what plot sizes are informative, i.e. the estimators should have as high precision as possible. 2. Plant occurrences were modeled...

Data from: A Drosophila female pheromone elicits species-specific long-range attraction via an olfactory channel with dual specificity for sex and food

Sebastien Lebreton, Felipe Borrero-Echeverry, Francisco Gonzalez, Marit Solum, Erika A. Wallin, Erik Hedenström, Bill S. Hansson, Anna-Lena Gustavsson, Marie Bengtsson, Göran Birgersson, , Hany K. M. Dweck, Paul G. Becher & Peter Witzgall
Background: Mate finding and recognition in animals evolves during niche adaptation and involves social signals and habitat cues. Drosophila melanogaster and related species are known to be attracted to fermenting fruit for feeding and egg-laying, which poses the question of whether species-specific fly odours contribute to long-range premating communication. Results: We have discovered an olfactory channel in D. melanogaster with a dual affinity to sex and food odorants. Female flies release a pheromone, (Z)-4-undecenal (Z4-11Al),...

The female pheromone (Z)-4-undecenal mediates flight attraction and courtship in Drosophila melanogaster

Peter Witzgall, Felipe Borrero-Echeverry, Marit Solum, Federica Trona, Erika A. Wallin, Marie Bengtsson, Peter Witzgall & Sebastien Lebreton
Specific mate communication and recognition underlies reproduction and hence speciation. Mate communication evolves during adaptation to ecological niches and makes use of social signals and habitat cues. Our study provides new insights in Drosophila melanogaster premating olfactory communication, showing that female pheromone (Z)-4-undecenal (Z4-11Al) and male pheromone cVA interact with food odour in a sex-specific manner. Furthermore, Z4-11Al, which mediates upwind flight attraction in both sexes, also elicits courtship in experienced males. Twin variants of...

Presence-absence sampling for estimating plant density using survey data with variable plot size

Göran Ståhl, Magnus Ekström, Jonas Dahlgren, Per-Anders Esseen, Anton Grafström & Bengt Jonsson
1. Presence-absence sampling is an important method for monitoring state and change of both individual plant species and communities. With this method only the presence or absence of the target species is recorded on plots and thus the method is straightforward to apply and less prone to surveyor judgment compared to other vegetation monitoring methods. However, in the basic setting all plots must be equally large or otherwise it is unclear how data should be...

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  • Mid Sweden University
  • Swedish University of Agricultural Sciences
  • Umeå University
  • University of Alberta
  • University of Quebec at Montreal
  • University of Eastern Finland
  • Dalhousie University
  • Lakehead University
  • Max Planck Institute for Chemical Ecology
  • Université du Québec en Abitibi-Témiscamingue