276 Works

Data from: Reference data for the Ruff Figural Fluency Test stratified by age and educational level

Gerbrand J. Izaks, Hanneke Joosten, Janneke Koerts, Ron T. Gansevoort & Joris P. Slaets
The Ruff Figural Fluency Test (RFFT) was developed to avoid the difficulties that were encountered in earlier tests of figural fluency. Although the test characteristics of the RFFT seem to be good and it is a valuable addition to neuropsychological assessments, reference data are still scarce. To this aim, we required 2,404 community dwelling persons in Groningen, The Netherlands to perform the RFFT. All 1,651 persons with a complete RFFT and known educational level formed...

Data from: Genetic consequences of breaking migratory traditions in barnacle geese Branta leucopsis

Rudy M. Jonker, Robert H. S. Kraus, Qiong Zhang, Pim Van Hooft, Kjell Larsson, Henk P. Van Der Jeugd, Ralf H. J. M. Kurvers, Sip E. Van Wieren, Maarten J. J. M. Loonen, Richard P. M. A. Crooijmans, Ronald C. Ydenberg, Martien A. M. Groenen, Herbert H. T. Prins & M. J. J. E. Loonen
Cultural transmission of migratory traditions enables species to deal with their environment based on experiences from earlier generations. Also, it allows a more adequate and rapid response to rapidly changing environments. When individuals break with their migratory traditions, new population structures can emerge that may affect gene flow. Recently, the migratory traditions of the Barnacle Goose Branta leucopsis changed, and new populations differing in migratory distance emerged. Here, we investigate the population genetic structure of...

Data from: A novel integrative method for measuring body condition in ecological studies based on physiological dysregulation

Emmanuel Milot, Alan A. Cohen, François Vézina, Deborah M. Buehler, Kevin D. Matson, Theunis Piersman & Theunis Piersma
1. The body condition of free-ranging animals affects their response to stress, decisions, ability to fulfil vital needs and, ultimately, fitness. However, this key attribute in ecology remains difficult to assess, and there is a clear need for more integrative measures than the common univariate proxies. 2. We propose a systems biology approach that positions individuals along a gradient from a ‘normal/optimal’ to ‘abnormal/suboptimal’ physiological state based on Mahalanobis distance computed from physiological biomarkers. We...

Data from: Frugivores and cheap fruits make fruiting fruitful

Francisco Encinas-Viso, Tomas A. Revilla, Ellen Van Velzen & Rampal S. Etienne
Animal seed dispersal provides an important ecosystem service by strongly benefiting plant communities. There are several theoretical studies on the ecology of plant-animal seed-disperser interactions, but few studies have explored the evolution of this mutualism. Moreover, these studies ignore plant life-history and frugivore foraging behavior. Thus, it remains an open question what the conditions for the diversification of fruit traits are, in spite of the multitude of empirical studies on fruit trait diversity. Here we...

Data from: When and where does mortality occur in migratory birds? Direct evidence from long-term satellite tracking of raptors

Raymond H. G. Klaassen, Michael Hake, Roine Strandberg, Ben J. Koks, Christiane Trierweiler, Klaus-Michael Exo, Franz Bairlein, Thomas Alerstam & Mikael Hake
1. Information about when and where animals die is important to understand population regulation. In migratory animals, mortality might occur not only during the stationary periods (e.g. breeding and wintering) but also during the migration seasons. However, the relative importance of population limiting factors during different periods of the year remains poorly understood, and previous studies mainly relied on indirect evidence. 2. Here we provide direct evidence about when and where migrants die by identifying...

Skeleton 1000

Canan Çakirlar

Data from: Dynamics of deep soil carbon - insights from 14C time series across a climatic gradient

Tessa Sophia Van Der Voort, Utsav Mannu, Frank Hagedorn, Cameron McIntyre, Lorenz Walthert, Patrick Schleppi, Negar Haghipour & Timothy I. Eglinton
Quantitative constraints on soil organic matter (SOM) dynamics are essential for comprehensive understanding of the terrestrial carbon cycle. Deep soil carbon is of particular interest, as it represents large stocks and its turnover times remain highly uncertain. In this study, SOM dynamics in both the top and deep soil across a climatic (average temperature ~1-9 °C) gradient are determined using time-series (~20 years) 14C data from bulk soil and water-extractable organic carbon (WEOC). Analytical measurements...

A molecular view on the escape of lipoplexed DNA from the endosome (no trajectories)

Bart Bruininks, Paulo De Souza, Helgi Ingolffson & Siewert Marrink
The use of non-viral vectors for in vivo gene therapy could drastically increase safety, whilst reducing the cost of preparing the vectors. A promising approach to non-viral vectors makes use of DNA/cationic liposome complexes (lipoplexes) to deliver the genetic material. Here we use coarse-grained molecular dynamics simulations to investigate the molecular mechanism underlying efficient DNA transfer from lipoplexes. Our computational fusion experiments of lipoplexes with endosomal membrane models show two distinct modes of transfection: parallel...

High-arctic family planning: earlier spring onset advances age at first reproduction in barnacle geese

Kate Layton-Matthews, Mari Aas Fjelldal, Aline Magdalena Lee, Vidar Grøtan, Maarten J.J.E. Loonen & Brage Bremset Hansen
Quantifying how key life-history traits respond to climatic change is fundamental in understanding and predicting long-term population prospects. Age at first reproduction, which affects fitness and population dynamics, may be influenced by environmental stochasticity but has rarely been directly linked to climate change. Here, we use a case study from the highly seasonal and stochastic environment in high-arctic Svalbard, with strong temporal trends in breeding conditions, to test whether rapid climate warming may induce changes...

Data from: Exposing the structure of an Arctic food web

Eero J. Vesterinen, Helena K. Wirta, Peter A. Hambäck, Elisabeth Weingartner, Claus Rasmussen, Jeroen Reneerkens, Niels M. Schmidt, Olivier Gilg & Tomas Roslin
How food webs are structured has major implications for their stability and dynamics. While poorly studied to date, arctic food webs are commonly assumed to be simple in structure, with few links per species. If this is the case, then different parts of the web may be weakly connected to each other, with populations and species united by only a low number of links. We provide the first highly resolved description of trophic link structure...

Data from: Cost-minimization model of a multidisciplinary antibiotic stewardship team based on a successful implementation on a urology ward of an academic hospital

Jan-Willem H. Dik, Ron Hendrix, Alex W. Friedrich, Jos Luttjeboer, Prashant Nannan Panday, Kasper R. Wilting, Jerome R. Lo-Ten-Foe, Maarten J. Postma & Bhanu Sinha
Background: In order to stimulate appropriate antimicrobial use and thereby lower the chances of resistance development, an Antibiotic Stewardship Team (A-Team) has been implemented at the University Medical Center Groningen, the Netherlands. Focus of the A-Team was a pro-active day 2 case-audit, which was financially evaluated here to calculate the return on investment from a hospital perspective. Methods: Effects were evaluated by comparing audited patients with a historic cohort with the same diagnosis-related groups. Based...

Data from: Enhanced computational methods for quantifying the effect of geographic and environmental isolation on genetic differentiation

Gilles Guillot, Filippo Botta, Capser Eriksen & Michaël C. Fontaine
1. In a recent paper, Bradburd et al. (Evolution, 67, 2013, 3258) proposed a model to quantify the relative effect of geographic and environmental distance on genetic differentiation. Here, we enhance this method in several ways. 2. We modify the covariance model so as to fit better with mainstream geostatistical models and avoid mathematically ill-behaved covariance functions. We extend the model – initially implemented only for co-dominant bi-allelic markers such as single nucleotide polymorphisms –...

Data from: Structure and functioning of intertidal food webs along an avian flyway: a comparative approach using stable isotopes

Teresa Catry, Pedro M. Lourenço, Ricardo J. Lopes, Camilo Carneiro, José A. Alves, Joana Costa, Hamid Rguibi-Idrissi, Stuart Bearhop, Theunis Piersma & José P. Granadeiro
Food webs and trophic dynamics of coastal systems have been the focus of intense research throughout the world, as they prove to be critical in understanding ecosystem processes and functions. However, very few studies have undertaken a quantitative comparison of entire food webs from a key consumer perspective across a broad geographical area, limiting relevant comparisons among systems with distinct biotic and abiotic components. We investigate the structure and functioning of food webs in four...

Data from: Effects of fleas on nest success of Arctic barnacle geese: experimentally testing the mechanism

Margje E. De Jong & Maarten J.J.E. Loonen
Parasites have detrimental effects on their hosts’ fitness. Therefore, behavioural adaptations have evolved to avoid parasites or, when an individual is already in contact with a parasite, prevent or minimize infections. Such anti-parasite behaviours can be very effective, but can also be costly for the host. Specifically, ectoparasites can elicit strong host anti-parasite behaviours and interactions between fleas (Siphonaptera) and their hosts are one of the best studied. In altricial bird species, nest fleas can...

Data from: An experimental test of state-behaviour feedbacks: gizzard mass and foraging behaviour in red knots

Kimberley J. Mathot, Anne Dekinga & Theunis Piersma
1. Animals frequently exhibit consistent among-individual differences in behavioural and physiological traits that are inherently flexible. Why should individuals differ consistently in their expression of labile traits? Recently, positive feedbacks between state and behaviour have been proposed as a parsimonious explanation for the maintenance of consistent among-individual differences in both state and behaviour. If state affects behaviour, and behaviour reciprocally affects state, then even chance differences in either state or behaviour that arise among-individuals could...

Data from: Delayed dispersal and the costs and benefits of different routes to independent breeding in a cooperatively breeding bird

Sjouke A. Kingma, Kat Bebbington, Martijn Hammers, David S. Richardson & Jan Komdeur
Why sexually mature individuals stay in groups as nonreproductive subordinates is central to the evolution of sociality and cooperative breeding. To understand such delayed dispersal, its costs and benefits need to be compared with those of permanently leaving to float through the population. However, comprehensive comparisons, especially regarding differences in future breeding opportunities, are rare. Moreover, extraterritorial prospecting by philopatric individuals has generally been ignored, even though the factors underlying this route to independent breeding...

Datasets used for the publication: State-dependence explains individual variation in nest defence behaviour in a long-lived bird

Margje E. De Jong, Marion Nicolaus, Rienk W. Fokkema & Maarten J.J.E. Loonen
The uploaded datasets were used to test if variation in states predicts nest defence behaviour (a ‘risky’ behaviour) in a long-lived species, the barnacle goose (Branta leucopsis). Repeated measures of nest defence towards a human intruder (flight initiation distance or FID) of females of known age were collected during 15 breeding seasons. Increasing values of FID represent increasing shyness. Adaptive models have predicted that an individual’s residual reproductive value or ‘asset’ is an important state...

Data from: Nest survival in year-round breeding tropical Red-capped Larks (Calandrella cinerea) increases with higher nest abundance but decreases with higher invertebrate availability and rainfall

Joseph Mwangi, Henry K. Ndithia, Rosemarie Kentie, Muchane Muchai & B. Irene Tieleman
Nest survival is critical to breeding in birds and plays an important role in life-history evolution and population dynamics. Studies evaluating the proximate factors involved in explaining nest survival and the resulting temporal patterns are biased in favor of temperate regions. Yet, such studies are especially pertinent to the tropics, where nest predation rates are typically high and environmental conditions often allow for year-round breeding. To tease apart the effects of calendar month and year,...

Data from: The impact of translocations on neutral and functional genetic diversity within and among populations of the Seychelles warbler

David J. Wright, Lewis G. Spurgin, Nigel J. Collar, Jan Komdeur, Terry Burke & David S. Richardson
Translocations are an increasingly common tool in conservation. The maintenance of genetic diversity through translocation is critical for both the short and long term persistence of populations and species. However, the relative spatio-temporal impacts of translocations on neutral and functional genetic diversity and how this affects genetic structure among the conserved populations overall has received little investigation. We compared the impact of translocating different numbers of founders on both microsatellite and major histocompatibility complex (MHC)...

Data from: Behavioural isolation may facilitate homoploid hybrid speciation in cichlid fish

Oliver M. Selz, Rahel Thommen, Martine E. Maan & Ole Seehausen
Hybrid speciation is constrained by the homogenizing effects of gene flow from the parental species. In the absence of post-mating isolation due to structural changes in the genome, or temporal or spatial premating isolation, another form of reproductive isolation would be needed for homoploid hybrid speciation to occur. Here, we investigate the potential of behavioural mate choice to generate assortative mating among hybrids and parental species. We made three-first-generation hybrid crosses between different species of...

Data from: Tightly congruent bursts of lineage and phenotypic diversification identified in a continental ant radiation

Shauna L. Price, Rampal S. Etienne & Scott Powell
Adaptive diversification is thought to be shaped by ecological opportunity. A prediction of this ecological process of diversification is that it should result in congruent bursts of lineage and phenotypic diversification, but few studies have found this expected association. Here, we study the relationship between rates of lineage diversification and body size evolution in the turtle ants, a diverse Neotropical clade. Using a near complete, time-calibrated phylogeny we investigated lineage diversification dynamics and body size...

Data from: Repeatable and heritable behavioural variation in a wild cooperative breeder

Hannah A. Edwards, Terry Burke & Hannah L. Dugdale
Quantifying consistent differences in behaviour among individuals is vital to understanding the ecological and evolutionary significance of animal personality. To quantify personality, the phenotypic variation of a behavioural trait is partitioned to assess how it varies among individuals, which is also known as repeatability. If pedigree data are available, the phenotypic variation can then be further partitioned to estimate the additive genetic variance and heritability. Assessing the repeatability and heritability of personality traits therefore allows...

Data from: Social conformity and propagation of information in collective u-turns of fish schools

Valentin Lecheval, Li Jiang, Pierre Tichit, Clément Sire, Charlotte K. Hemelrijk & Guy Theraulaz
Moving animal groups such as schools of fish or flocks of birds often undergo sudden collective changes of their travelling direction as a consequence of stochastic fluctuations in heading of the individuals. However, the mechanisms by which these behavioural fluctuations arise at the individual level and propagate within a group are still unclear. In the present study, we combine an experimental and theoretical approach to investigate spontaneous collective U-turns in groups of rummy-nose tetra (Hemigrammus...

Density-dependent individual variation in male attractiveness in a wild field cricket

Petri Niemelä, Stefano Tiso & Niels Dingemanse
Social environments modify a male’s ability to attract females and thus affect its fitness. Theory implies that an individual’s fitness should trade-off with its ability to cope with competition. Individuals are expected to solve this trade-off differently: some males should be more attractive at low but others instead at high density. This prediction has rarely been tested in the wild. We used an automated RFID-surveillance system to quantify for each hour of the day, over...

Data from: Mediation analysis demonstrates that trans-eQTLs are often explained by cis-mediation: a genome-wide analysis among 1,800 South Asians

Brandon L. Pierce, Lin Tong, Lin S. Chen, Ronald Rahaman, Maria Argos, Farzana Jasmine, Shantanu Roy, Rachelle Paul-Brutus, Harm-Jan Westra, Lude Franke, Tonu Esko, Rakibuz Zaman, Tariqul Islam, Mahfuzar Rahman, John A. Baron, Muhammad G. Kibriya & Habibul Ahsan
A large fraction of human genes are regulated by genetic variation near the transcribed sequence (cis-eQTL, expression quantitative trait locus), and many cis-eQTLs have implications for human disease. Less is known regarding the effects of genetic variation on expression of distant genes (trans-eQTLs) and their biological mechanisms. In this work, we use genome-wide data on SNPs and array-based expression measures from mononuclear cells obtained from a population-based cohort of 1,799 Bangladeshi individuals to characterize cis-...

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