365 Works

Dark diversity reveals importance of biotic resources and competition for plant diversity across habitats

Camilla Fløjgaard, José Valdez, Lars Dalby, Jesper Erenskjold Moeslund, Kevin Clausen, Rasmus Ejrnæs, Meelis Partel & Ane Kirstine Brunbjerg
Species richness is the most commonly used metric to quantify biodiversity. However, examining dark diversity, the group of missing species which can potentially inhabit a site, can provide a more thorough understanding of the processes influencing observed biodiversity and help evaluate the restoration potential of local habitats. So far, dark diversity has mainly been studied for specific habitats or largescale landscapes while less attention has been given to variation across broad environmental gradients or as...

Criteria for defining interictal epileptiform discharges in EEG: a clinical validation study

Mustafa Aykut Kural, Lene Duez, Vibeke Sejer Hansen, Pål Gunnar Larsson, Stefan Rampp, Reinhard Schulz, Hatice Tankisi, Richard Wennberg, Bo Bibby, Michael Scherg & Sandor Beniczky
Objective: To define and validate criteria for accurate identification of EEG interictal epileptiform discharges (IEDs) using: (a) the six sensor space criteria proposed by the International Federation of Clinical Neurophysiology (IFCN), and, (b) a novel source space method. Criteria yielding high specificity are needed because EEG “over-reading” is a common cause of epilepsy misdiagnosis. Methods: Seven raters reviewed EEG segments containing sharp waveforms from 100 patients with and without epilepsy. Clinical diagnosis gold standard was...

Introduction to citizen science. The case of Fangstjournalen.dk

Jitka Stilund Hansen, Signe Gadegaard, Karsten Kryger Hansen, Gertrud Stougård Thomsen, Asger Væring Larsen & Katrine Flindt Holmstrand

FAIR data in a Citizen Science project “Fangstjournalen”

Katrine Flindt Holmstrand, Asger Væring Larsen, Signe Gadegaard, Jitka Stilund Hansen, Karsten Kryger Hansen & Gertrud Stougård Thomsen
In this video Researcher Christian Skov from DTU Aqua tells about the Citizen Science project “Fangstjournalen” and how Research Data Management, data sharing and following the FAIR guiding principles for research data can increase the impact and the value of the research - even beyond the scope of the project. This video is produced by four Danish Universities as part of a project financially supported by DEFF. The aim of the project is to identify...

Different pollination approaches to compare the seed set of diploid and tetraploid red clover (Trifolium pratense L.)

Shuxuan Jing, Per Kryger & Birte Boelt
In red clover seed production, low seed yield is limiting the commercial exploitation of tetraploid red clover. To explore if pollination is the limiting factor for the seed yield in tetraploid red clover, we investigated pollinator behaviour and plant reproductive success in diploid (2x) cultivar ‘Rajah’ and tetraploid (4x) cultivar ‘Amos’ using honey bee and hand pollination approaches. We measured the seed set at the flower head level with the increasing visitation rate in honey...

COVID-19-forskning: Del data om dine aktiviteter i ny app, og gør en forskel

Trine Rolighed Thomsen, Zahra Partovi Nasr & Carsten Obel

Genotypes of Swan Geese Anser cygnoides using 17 nuclear microsatellite loci at 14 locations.

Qin Zhu, Iderbat Damaba, Qingshan Zhao, Kunpeng Yi, Nyambayar Batbayar, Tseveenmyadag Natsagdorj, Davaasuren Batmunkh, Xin Wang, Sonia Rozenfeld, Sachiko Moriguchi, Aibin Zhan, Lei Cao & Anthony David Fox
Dispersal affects the spatial distribution and population structure of species.Dispersal is often male-biased in mammals while female-biased in birds, with the notable exception of the Anatidae. In this study, we tested genetic evidence for sex-biased dispersal (SBD) in the Swan Goose Anser cygnoides, an Asian endemic and IUCN vulnerable species, which has been increasingly restricted to breeding on Mongolian steppe wetlands. We analyzed the genotypes of 278 Swan Geese samples from 14 locations at 14...

Data from: Arthropods as vertebrate predators: a review of global patterns

Jose Valdez
Aim: Arthropods as vertebrate predators is generally overlooked in ecology due to the cryptic nature of these events, the relatively small size of arthropods, and the difficulty in finding published data. This study represents the largest global assessment of arthropods preying on vertebrates to provide a conceptual framework, identify global patterns, and provide a searchable database. Location: Global. Time period: Present. Major taxa studied: Arthropods and vertebrates. Methods: A systematic literature review was conducted. Results:...

Hvordan spredte mennesket sig fra Afrika og ud over Jorden?

Ole Høiris

The biomolecular characterisation of a finger ring contextually dated to the emergence of the Early Neolithic from Syltholm, Denmark

Theis Jensen, Meaghan Mackie, Alberto Taurozzi, Liam Lannigan, Carsten Gundelach, Jesper Olsen, Søren Sørensen, Matthew Collins, Mikkel Sørensen & Hannes Schroeder
We present the analysis of an osseous finger ring from a predominantly early Neolithic context in Denmark. To characterise the artefact and identify the raw material used for its manufacture, we performed micro-computed tomography (Micro CT) scanning, zooarchaeology by mass spectrometry (ZooMS) peptide mass fingerprinting, as well as protein sequencing by liquid chromatography tandem mass spectrometry (LC-MS/MS). We conclude that the ring was made from long bone or antler due to the presence of osteons...

Homo sapiens' vandring ud af Afrika var… snørklet

Ole Høiris

Det moderne menneskes vej ind i Asien stiller store spørgsmål til vores oprindelse

Ole Høiris

Data from: Overall dynamic body acceleration measures activity differently on large vs small aquatic animals

Lucía Martina Martín López, Natacha Aguilar De Soto, Peter Teglberg Madsen & Mark Johnson
Acceleration-based proxies for activity and energy expenditure are widely used in bio-logging studies of animal movement and locomotion to explore biomechanical strategies, energetic costs of behaviour, habitat use and the impact of anthropogenic disturbance. The foremost such proxy is Overall Dynamic Body Acceleration (ODBA) along with variants VeDBA and PDBA. This technique, which involves summing the magnitude of high-pass-filtered acceleration signals (the so-called dynamic acceleration) over a reference interval, has been applied to animals as...

Hvornår kom de første mennesker til Amerika? Sporene bliver ældre og ældre

Ole Høiris

Lobbying in Scandinavia

Øyvind Ihlen, Anne Skorkjær Binderkrantz & PerOla Öberg

Bodyweight, body condition and anatomy

Sadjad Danesh Mesgaran, Martin Weisbjerg, Alex Bach, Jennifer Salau, Jan Henning Haas, Wolfgang Junge, Georg Thaller & Björn Kuhla
Measuring bodyweight (BW) in cattle is essential for many research and management activities such as calculating dietary energy requirements for maintenance, calculating average daily gain and evaluating breeding values which include BW as a trait. Frequent monitoring of BW in dairy cows is necessary as changes in BW can help assess the energy balance of an animal. Precise understanding of BW gain of growing and fattening cattle or body mass changes during lactation is crucial...

Data from: Warming and eutrophication interactively drive changes in the methane-oxidizing community of shallow lakes

Thomas P.A. Nijman, Thomas A. Davidson, Stefan T.J. Weideveld, Joachim Audet, Chiara Esposito, Eti E. Levi, Adrian Ho, Leon P.M. Lamers, Erik Jeppesen & Annelies J. Veraart
Freshwater ecosystems are the largest natural source of the greenhouse gas methane (CH4), with shallow lakes a particular hot spot. Eutrophication and warming generally increase lake CH4 emissions but their impacts on the sole biological methane sink - methane oxidation - and methane-oxidizer community dynamics are poorly understood. We used the world’s longest-running freshwater climate-change mesocosm experiment to determine how methane-oxidizing bacterial (MOB) abundance and composition, and methane oxidation potential in the sediment respond to...

The topography of the Eurekan Orogen of Ellesmere Island and the Canadian-Greenland polar continental margin

Randell Stephenson, Gordon Oakey & Søren Bom Nielsen

Detecting purging of inbreeding depression by a slow rate of inbreeding for various traits: the impact of environmental and experimental conditions

Mads Fristrup Schou, Jørgen Bundgaard, Volker Loeschcke &
Inbreeding depression (ID) has since long been recognized as a significant factor in evolutionary biology. It is mainly the consequence of (partially) recessive deleterious mutations maintained by mutation-selection balance in large random mating populations. When population size is reduced, recessive alleles are increasingly found in homozygous condition due to drift and inbreeding and become more prone to selection. Particularly at slow rates of drift and inbreeding, selection will be more effective in purging such alleles,...

Flagermus er effektive dræbere, fordi de jager med tunnelsyn

Laura Stidsholt

Data from: Range-dependent flexibility in the acoustic field of view of echolocating porpoises (Phocoena phocoena)

Danuta M. Wisniewska, John M. Ratcliffe, Kristian Beedholm, Christian B. Christensen, Mark Johnson, Jens C. Koblitz, Magnus Wahlberg & Peter M. Madsen
Toothed whales use sonar to detect, locate, and track prey. They adjust emitted sound intensity, auditory sensitivity and click rate to target range, and terminate prey pursuits with high-repetition-rate, low-intensity buzzes. However, their narrow acoustic field of view (FOV) is considered stable throughout target approach, which could facilitate prey escape at close-range. Here, we show that, like some bats, harbour porpoises can broaden their biosonar beam during the terminal phase of attack but, unlike bats,...

Data from: All roads lead to home: panmixia of European eel in the Sargasso Sea

Thomas D Als, Michael M Hansen, Gregory E Maes, Martin Castonguay, Lasse Riemann, Kim Aarestrup, Peter Munk, Henrik Sparholt, Reinhold Hanel & Louis Bernatchez
European eels (Anguilla anguilla) spawn in the remote Sargasso Sea in partial sympatry with American eels (Anguilla rostrata), and juveniles are transported more than 5,000 kilometres back to the European and North African coasts. The two species have been regarded as classic textbook examples of panmixia, each comprising a single, randomly mating population. However, several recent studies based on continental samples have found subtle, but significant, genetic differentiation, interpreted as geographical or temporal heterogeneity between...

Data from: \"Diagnostic SNPs for inferring population structure in American mink (Neovison vison) identified through RAD sequencing\" in Genomic Resources Notes accepted 1 October 2014 to 30 November 2014

Janne Pia Thirstrup, Aritz Ruiz-Gonzalez, Jose Martin Pujolar, Peter Foged Larsen, Rasmus O. Nielsen, Ettore Randi, Andrzej Zalewski, Cino Pertoldi, Mariella Baratti, Tiziana Di Lorenzo, Alessio Iannucci, Diana Maria Paola Galassi, Valentina Iannilli, Just Jensen, Dragos Postolache & Giovanni Giuseppe Vendramin
The article documents the public availability of RAD sequencing data and generated SNPs for the American mink (Neovison vison). 224,095 polymorphic loci were identified from 14 mink from which primers were designed for a subset of 380 SNPs. The panel was tested on 211 mink. Fisher’s F-statistics (Fis, FIT and FST) as well as observed (HO), expected (HE) and unbiased expected (uHE) heterozygosity was calculated for the SNPs and 194 SNPs was validated as being...

Data from: Low evolutionary potential for egg-to-adult viability in Drosophila melanogaster at high temperatures

Torsten Nygaard Kristensen, Johannes Overgaard, Jan Lassen, Ary A. Hoffmann & Carla M. Sgro
To cope with the increasing and less predictable temperature forecasts under climate change, many terrestrial ectotherms will have to migrate or rely on adaptation through plastic or evolutionary means. Studies suggest that some ectotherms have a limited potential to change their upper thermal limits via evolutionary shifts, but research has mostly focused on adult life stages under laboratory conditions. Here we use replicate populations of Drosophila melanogaster and a nested half sib/full sib quantitative genetic...

Data from: Inbreeding depression across a nutritional stress continuum

Mads F. Schou, Volker Loeschcke & Torsten F. Kristensen
Many natural populations experience inbreeding and genetic drift as a consequence of nonrandom mating or low population size. Furthermore, they face environmental challenges that may interact synergistically with deleterious consequences of increased homozygosity and further decrease fitness. Most studies on inbreeding–environment (I-E) interactions use one or two stress levels, whereby the resolution of the possible stress and inbreeding depression interaction is low. Here we produced Drosophila melanogaster replicate populations, maintained at three different population sizes...

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