30 Works

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: Current management of surgical oncologic emergencies

Marianne R. F. Bosscher, Barbara L. Van Leeuwen & Harald J. Hoekstra
Objectives: For some oncologic emergencies, surgical interventions are necessary for dissolution or temporary relieve. In the absence of guidelines, the most optimal method for decision making would be in a multidisciplinary cancer conference (MCC). In an acute setting, the opportunity for multidisciplinary discussion is often not available. In this study, the management and short term outcome of patients after surgical oncologic emergency consultation was analyzed. Method: A prospective registration and follow up of adult patients...

Data from: Climate impacts on trans-ocean dispersal and habitat in gray whales from the Pleistocene to 2100

S. Elizabeth Alter, Matthias Meyer, Klaas Post, Paul Czechowski, Peter Gravlund, Cork Gaines, Howard C. Rosenbaum, Kristin Kaschner, Samuel T. Turvey, Johannes Van Der Plicht, Beth Shapiro & Michael Hofreiter
Arctic animals face dramatic habitat alteration due to ongoing climate change. Understanding how such species have responded to past glacial cycles can help us forecast their response to today's changing climate. Gray whales are among those marine species likely to be strongly affected by Arctic climate change, but a thorough analysis of past climate impacts on this species has been complicated by lack of information about an extinct population in the Atlantic. While little is...

Data from: Relative deprivation and relative wealth enhances anti-immigrant sentiments: the v-curve re-examined

Jolanda Jetten, Frank Mols & Tom Postmes
Previous research has shown that negative attitudes towards immigrants and support for anti-immigrant parties are observed both among those experiencing relative deprivation and those experiencing relative gratification (so called v-curve). Whereas the effect of relative deprivation is intuitive, the effect of relative gratification is more difficult to explain. Why would economic prosperity provoke negative attitudes towards immigrants? We first present correlational (Study 1) and experimental (Study 2) support for the v-curve. In Study 1, in...

Data from: MHC class II assortative mate choice in European badgers (Meles meles)

Yung Wa Sin, Geetha Annavi, Chris Newman, Christina Buesching, Terry Burke, David W. Macdonald & Hannah L. Dugdale
The major histocompatibility complex (MHC) plays a crucial role in the immune system, and in some species, it is a target by which individuals choose mates to optimize the fitness of their offspring, potentially mediated by olfactory cues. Under the genetic compatibility hypothesis, individuals are predicted to choose mates with compatible MHC alleles, to increase the fitness of their offspring. Studies of MHC-based mate choice in wild mammals are under-represented currently, and few investigate more...

Data from: Experimental manipulation of food availability leads to short-term intra-clutch adjustment in egg mass but not in yolk androgen or thyroid hormones

Suvi Ruuskanen, Veerle M. Darras, Bonnie De Vries, Marcel E. Visser & Ton G. G. Groothuis
In birds, mothers can affect their offspring's phenotype and thereby survival via egg composition. It is not well known to what extent and time-scales environmental variation in resource availability, either via resource constrains or adaptive adjustment to predicted rearing conditions, influences maternal effects. We experimentally studied whether egg and yolk mass and yolk hormone levels respond to short-term changes in food availability during laying in wild great tits Parus major. Our treatment groups were: 1)...

Data from: Sex-specific pathways of parental age effects on offspring lifetime reproductive success in a long-lived seabird

Sandra Bouwhuis, Oscar Vedder & Peter H. Becker
The conditions under which individuals are reared vary and sensitivity of offspring to such variation is often sex-dependent. Parental age is one important natal condition with consequences for aspects of offspring fitness, but reports are mostly limited to short-term fitness consequences and do not take into account offspring sex. Here we used individual-based data from a large colony of a long-lived seabird, the common tern Sterna hirundo, to investigate longitudinal long-term fitness consequences of parental...

Data from: Quantitative comparison of commercial and non-commercial metal artifact reduction techniques in computed tomography

Dirk Wagenaar, Emiel R. Van Der Graaf, Arjen Van Der Schaaf & Marcel J. W. Greuter
Objectives: Typical streak artifacts known as metal artifacts occur in the presence of strongly attenuating materials in computed tomography (CT). Recently, vendors have started offering metal artifact reduction (MAR) techniques. In addition, a MAR technique called the metal deletion technique (MDT) is freely available and able to reduce metal artifacts using reconstructed images. Although a comparison of the MDT to other MAR techniques exists, a comparison of commercially available MAR techniques is lacking. The aim...

Data from: Population-level consequences of complementary sex determination in a solitary parasitoid

Jetske G. De Boer, Martien A. M. Groenen, Bart A. Pannebakker, Leo W. Beukeboom & Robert H. S. Kraus
Background: Sex determination mechanisms are known to be evolutionarily labile but the factors driving transitions in sex determination mechanisms are poorly understood. All insects of the Hymenoptera are haplodiploid, with males normally developing from unfertilized haploid eggs. Under complementary sex determination (CSD), diploid males can be produced from fertilized eggs that are homozygous at the sex locus. Diploid males have near-zero fitness and thus represent a genetic load, which is especially severe under inbreeding. Here,...

Data from: Low but contrasting neutral genetic differentiation shaped by winter temperature in European great tits

Mélissa Lemoine, Kay Lucek, Charles Perrier, Verena Saladin, Frank Adriaensen, Emilio Barba, Eduardo J. Belda, Anne Charmantier, Mariusz Cichon, Eeva Tapio, Arnaud Gregoire, Camilla A. Hinde, Arild Johnsen, Jan Komdeur, Raivo Mand, Erik Matthysen, Ana Claudia Norte, Natalia Pitala, Ben C. Sheldon, Tore Slagsvold, Joost M. Tinbergen, Janos Torok, Richard Ubels, Kees Van Oers, Marcel E. Visser … & Tapio Eeva
Gene flow is usually thought to reduce genetic divergence and impede local adaptation by homogenising gene pools between populations. However, evidence for local adaptation and phenotypic differentiation in highly mobile species, experiencing high levels of gene flow, is emerging. Assessing population genetic structure at different spatial scales is thus a crucial step towards understanding mechanisms underlying intraspecific differentiation and diversification. Here, we studied the population genetic structure of a highly mobile species – the great...

Data from: Longitudinal study of performance on the Ruff Figural Fluency Test in persons aged 35 years or older

Marlise E. A. Van Eersel, Hanneke Joosten, Janneke Koerts, Ron T. Gansevoort, Joris P. J. Slaets & Gerbrand J. Izaks
The Ruff Figural Fluency Test (RFFT) is a cognitive test to measure executive function. Longitudinal studies have shown that repeated testing improves performance on the RFFT. Such a practice effect may hinder the interpretation of test results in a clinical setting. Therefore, we investigated the longitudinal performance on the RFFT in persons aged 35–82 years. Performance on the RFFT was measured three times over an average follow-up period of six years in 2,515 participants of...

Data from: When Siberia came to the Netherlands: the response of continental black-tailed godwits to a rare spring weather event

Nathan R. Senner, Mo A. Verhoeven, José M. Abad-Gómez, Jorge S. Gutiérrez, Jos C. E. W. Hooijmeijer, Rosemarie Kentie, José A. Masero, T. Lee Tibbitts & Theunis Piersma
1. Extreme weather events have the potential to alter both short- and long-term population dynamics as well as community- and ecosystem-level function. Such events are rare and stochastic, making it difficult to fully document how organisms respond to them and predict the repercussions of similar events in the future. 2. To improve our understanding of the mechanisms by which short-term events can incur long-term consequences, we documented the behavioural responses and fitness consequences for a...

Data from: Within-family parent-offspring co-adaptation in a wild bird: on static traits, behavioural reaction norms and sex differences

Carsten Lucass, Peter Korsten, Marcel Eens & Wendt Müller
Parental care, a central component of reproduction in a wide range of animal species, often involves elaborate behavioural interactions between parents and their offspring. Due to the reciprocal nature of these interactions, it has been hypothesized that parental and offspring behaviours (e.g. parental food provisioning and offspring begging) are not only target but also agent of selection. These traits are therefore expected to co-evolve, ultimately leading to co-adaptation of parent and offspring behaviours within families....

Data from: High speciation rate at temperate latitudes explains unusual diversity gradients in a clade of ectomycorrhizal fungi

Santiago Sanchez-Ramirez, Rampal S. Etienne & Jean-Marc Moncalvo
Understanding the patterns of biodiversity through time and space is a challenging task. However, phylogeny-based macroevolutionary models allow us to account and measure many of the processes responsible for diversity build-up, namely speciation and extinction. The general latitudinal diversity gradient (LDG) is a well-recognized pattern describing a decline in species richness from the equator pole-wards. Recent macroecological studies in ectomycorrhizal (EM) fungi have shown that their LDG is shifted, peaking at temperate rather than tropical...

Data from: How well do molecular and pedigree relatedness correspond, in populations with variable mating systems, and types and quantities of molecular and demographic data?

Anna M. Kopps, Jungkoo Kang, William B. Sherwin & Per J. Palsbøll
Kinship analyses are important pillars of ecological and conservation genetic studies with potentially far-reaching implications. There is a need for power analyses that address a range of possible relationships. Nevertheless, such analyses are rarely applied, and studies that use genetic-data-based-kinship inference often ignore the influence of intrinsic population characteristics. We investigated 11 questions regarding the correct classification rate of dyads to relatedness categories (relatedness category assignments; RCA) using an individual-based model with realistic life history...

Data from: The importance of mechanisms for the evolution of cooperation

Pieter Van Den Berg & Franz J. Weissing
Studies aimed at explaining the evolution of phenotypic traits have often solely focused on fitness considerations, ignoring underlying mechanisms. In recent years, there has been an increasing call for integrating mechanistic perspectives in evolutionary considerations, but it is not clear whether and how mechanisms affect the course and outcome of evolution. To study this, we compare four mechanistic implementations of two well-studied models for the evolution of cooperation, the Iterated Prisoner's Dilemma (IPD) game and...

Data from: Effects of spring temperatures on the strength of selection on timing of reproduction in a long-distance migratory bird

Marcel E. Visser, Phillip Gienapp, Arild Husby, Michael Morrisey, Iván De La Hera, Francisco Pulido & Christiaan Both
Climate change has differentially affected the timing of seasonal events for interacting trophic levels, and this has often led to increased selection on seasonal timing. Yet, the environmental variables driving this selection have rarely been identified, limiting our ability to predict future ecological impacts of climate change. Using a dataset spanning 31 years from a natural population of pied flycatchers (Ficedula hypoleuca), we show that directional selection on timing of reproduction intensified in the first...

Data from: Plant-mycorrhizal fungus co-occurrence network lacks substantial structure

Francisco Encinas-Viso, David Alonso, John N. Klironomos, Rampal S. Etienne & Esther R. Chang
The interactions between plants and arbuscular mycorrhizal fungi (AMF) maintain a crucial link between macroscopic organisms and the soil microbial world. These interactions are of extreme importance for the diversity of plant communities and ecosystem functioning. Despite this importance, only recently has the structure of plant–AMF interaction networks been studied. These recent studies, which used genetic data, suggest that these networks are highly structured, very similar to plant–animal mutualistic networks. However, the assembly process of...

Data from: Functional traits reveal the expansion and packing of ecological niche space underlying an elevational diversity gradient in passerine birds

Alex L. Pigot, Christopher H. Trisos & Joseph A. Tobias
Variation in species richness across environmental gradients may be associated with an expanded volume or increased packing of ecological niche space. However, the relative importance of these alternative scenarios remains unknown, largely because standardised information on functional traits and their ecological relevance is lacking for major diversity gradients. Here we combine data on morphological and ecological traits for 523 species of passerine birds distributed across an Andes-to-Amazon elevation gradient. We show that morphological traits capture...

Data from: How the litter-feeding bioturbator Orchestia gammarellus promotes late successional salt marsh vegetation

Maarten Schrama, Lotte A. Van Boheemen, Han Olff & Matty P. Berg
1.Traditionally, studies on vegetation succession have focused either on plant-plant interactions, or on interactions between plants and their physical environment, e.g. through organic matter build-up and increased nutrient cycling. These interactions can change conditions for macrodetritivores that feed on plant litter, but their role in vegetation succession is rarely studied. In this paper we explore whether the bioturbating crustacean macrodetritivore Orchestia gammarellus alters soil conditions in a salt marsh ecosystem in such a way that...

Data from: Diploid males support a two-step mechanism of endosymbiont-induced thelytoky in a parasitoid wasp

Wen-Juan Ma, Bart A. Pannebakker, Louis Van De Zande, Tanja Schwander, Bregje Wertheim & Leo W. Beukeboom
Background Haplodiploidy, where females develop from diploid, fertilized eggs and males from haploid, unfertilized eggs, is abundant in some insect lineages. Some species in these lineages reproduce by thelytoky that is caused by infection with endosymbionts: infected females lay haploid eggs that undergo diploidization and develop into females, while males are very rare or absent. It is generally assumed that in thelytokous wasps, endosymbionts merely diploidize the unfertilized eggs, which would then trigger female development....

Data from: Phenotype-limited distributions: short-billed birds move away during times that prey bury deeply

Sjoerd Duijns, Jan A. Van Gils, Jennifer Smart & Theunis Piersma
In our seasonal world, animals face a variety of environmental conditions in the course of the year. To cope with such seasonality, animals may be phenotypically flexible, but some phenotypic traits are fixed. If fixed phenotypic traits are functionally linked to resource use, then animals should redistribute in response to seasonally changing resources, leading to a ‘phenotype-limited’ distribution. Here, we examine this possibility for a shorebird, the bar-tailed godwit (Limosa lapponica; a long-billed and sexually...

Registration Year

  • 2015

Resource Types

  • Dataset


  • University of Groningen
  • Royal Netherlands Institute for Sea Research
  • Nederlands Instituut voor Ecologie
  • University Medical Center Groningen
  • Wageningen University & Research
  • University of Oxford
  • University of Turku
  • Centre d'Ecologie Fonctionnelle et Evolutive
  • University of Antwerp
  • University of Helsinki