37 Works

Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird

Martijn Hammers, Sjouke Kingma, Lotte Van Boheemen, Alexandra Sparks, Terry Burke, Hannah Dugdale, David Richardson & Jan Komdeur
Offspring from elderly parents often have lower survival due to parental senescence. In cooperatively breeding species, where offspring care is shared between breeders and helpers, the alloparental care provided by helpers is predicted to mitigate the impact of parental senescence on offspring provisioning and, subsequently, offspring survival. We test this prediction using data from a long-term study on cooperatively breeding Seychelles warblers (Acrocephalus sechellensis). We find that the nestling-provisioning rate of female breeders declines with...

Estimating the time since admixture from phased and unphased molecular data

Thijs Janzen
After admixture, recombination breaks down genomic blocks of contiguous ancestry. The breakdown of these blocks forms a new `molecular clock', that ticks at a much faster rate than the mutation clock, enabling accurate dating of admixture events in the recent past. However, existing theory on the break down of these blocks, or the accumulation of delineations between blocks, so called `junctions', has mostly been limited to using regularly spaced markers on phased data. Here, we...

Data from: Telomere heritability and parental age at conception effects in a wild avian population

Alexandra Sparks, Lewis Spurgin, Marco Van Der Velde, Eleanor Fairfield, Jan Komdeur, Terry Burke, David Richardson & Hannah Dugdale
Individual variation in telomere length is predictive of health and mortality risk across a range of species. However, the relative influence of environmental and genetic variation on individual telomere length in wild populations remains poorly understood. Heritability of telomere length has primarily been calculated using parent–offspring regression which can be confounded by shared environments. To control for confounding variables, quantitative genetic ‘animal models’ can be used, but few studies have applied animal models in wild...

Artificial selection for non‐reproductive host killing in a native parasitoid on the invasive pest, Drosophila suzukii

A. Kruitwagen, B. Wertheim & L.W. Beukeboom
Establishment and spread of invasive species can be facilitated by lack of natural enemies in the invaded area. Host-range evolution of natural enemies augments their ability to reduce the impact of the invader and could enhance their value for biological control. We assessed the potential of the Drosophila parasitoid, Leptopilina heterotoma (Hymenoptera: Figitidae), to exploit the invasive pest Drosophila suzukii by focussing on three performance indices: (1) attack rate (2) host killing, consisting of killing...

Enhancing ecological integrity while preserving ecosystem services: constructing soft-sediment islands in a shallow lake

Casper Van Leeuwen, Ralph Temmink, Hui Jin, Yvonne Kahlert, Bjorn Robroek, Matty Berg, Leon Lamers, Marloes Van Den Akker, Roel Posthoorn, Annemiek Boosten, Han Olff &
1. Ecosystems are increasingly managed to provide multiple benefits to humans, which often degrades their ecological integrity. This strongly applies to aquatic ecosystems, in which engineering can enhance flood protection, drinking water supply, fisheries and recreation. Although these activities typically increase ecosystem functionality to humans, they often impair key aspects of biodiversity and natural functioning. 2. Classical restoration of such degrading freshwater ecosystems can lead to societal opposition, if returning to a former ecosystem state...

Queen-worker conflict can drive the evolution of social polymorphism and split sex ratios in facultatively eusocial life-cycles

Andres Quiñones, Gil Henriques & Ido Pen
Hamilton’s idea that haplodiploidy favors the evolution of altruism – the haplodiploidy hypothesis -- relies on the relatedness asymmetry between the sexes, caused by the sex-specific ploidies. Theoretical work on the consequences of relatedness asymmetries has significantly improved our understanding of sex-allocation and intra-colony conflicts, but the importance of haplodiploidy for the evolution of altruism came to be seen as minor. However, recently it was shown that haplodiploidy can strongly favor the evolution of eusociality,...

Data from: Contemporary evolution of the innate immune receptor gene TLR3 in an isolated vertebrate population

Charli Davies, Martin Taylor, Martijn Hammers, Terry Burke, Jan Komdeur, Hannah Dugdale & David Richardson
Understanding where genetic variation exists, and how it influences fitness within populations is important from an evolutionary and conservation perspective. Signatures of past selection suggest that pathogen-mediated balancing selection is a key driver of immunogenetic variation, but studies tracking contemporary evolution are needed to help resolve the evolutionary forces and mechanism at play. Previous work in a bottlenecked population of Seychelles warblers (Acrocephalus sechellensis) show that functional variation has been maintained at the viral-sensing Toll-like...

Causes and consequences of telomere lengthening in a wild vertebrate population

Thomas Brown, David Richardson, Lewis Spurgin, Hannah Dugdale, Jan Komdeur, Terry Burke & David Richardson
Telomeres have been advocated to be important markers of biological age in evolutionary and ecological studies. Telomeres usually shorten with age, and shortening is frequently associated with environmental stressors and increased subsequent mortality. Telomere lengthening – an apparent increase in telomere length between repeated samples from the same individual – also occurs. However, the exact circumstances, and consequences, of telomere lengthening are poorly understood. Using longitudinal data from the Seychelles warbler (Acrocephalus sechellensis), we tested...

Data: How does external lateral stabilization constrain normal gait, apart from improving medio-lateral gait stability?

Mohammadreza Mahaki, Trienke IJmker, Han Han Houdijk & Sjoerd Bruijn
Background: The effect of external lateral stabilization on medio-lateral gait stability has been investigated previously. However, existing lateral stabilization devices not only constrains lateral motions, but also transverse and frontal pelvis rotations. This study aimed to investigate the effect of external lateral stabilization with and without constrained transverse pelvis rotation on mechanical and metabolic gait features. Methods: We undertook 2 experiments with eleven and ten young adult subjects, respectively. Kinematic, kinetic, and breath-by-breath oxygen consumption...

Data from: Telomere length is highly heritable and independent of growth rate manipulated by temperature in field crickets

Jelle Boonekamp, Rolando Rodríguez-Muñoz, Paul Hopwood, Erica Zuidersma, Ellis Mulder, Alastair Wilson, Simon Verhulst & Tom Tregenza
Many organisms are capable of growing faster than they do. Restrained growth rate has functionally been explained by negative effects on lifespan of accelerated growth. However, the underlying mechanisms remain elusive. Telomere attrition has been proposed as a causal agent and has been mostly studied in endothermic vertebrates. We established that telomeres exist as chromosomal-ends in a model insect, the field cricket G. campestris, using terminal restriction fragment and Bal 31 methods. Telomeres comprised TTAGGn...

Epistatic interactions between sex chromosomes and autosomes can affect the stability of sex determination systems

Martijn Schenkel, Leo W. Beukeboom & Ido Pen
Sex determination (SD) is an essential and ancient developmental process, but the genetic systems that regulate this process are surprisingly variable. Why SD mechanisms vary so much is a longstanding question in evolutionary biology. SD genes are generally located on sex chromosomes which also carry genes that interact epistatically with autosomes to affect fitness. How this affects the evolutionary stability of SD mechanisms is still unknown. Here, we explore how epistatic interactions between a sexually...

Green turtle ddRAD raw sequencing data

Jurjan Van Der Zee, Marjolijn Christianen, Martine Bérubé, Mabel Nava, Kaj Schut, Frances Humber, Alonzo Alfaro-Núñez, Leontine Becking & Per Palsbøll
The occasional westward transport of warm water of the Agulhas Current, ‘Agulhas leakage’, around southern Africa has been suggested to facilitate tropical marine connectivity between the Atlantic and Indian oceans, but the ‘Agulhas leakage’ hypothesis doesn’t explain the signatures of eastward gene flow observed in many tropical marine fauna. We investigated an alternative hypothesis: the establishment of a warm-water corridor during comparatively warm interglacial periods. The ‘warm-water corridor’ hypothesis was investigated by studying the population...

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Affiliations

  • University of Groningen
    37
  • University of Sheffield
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  • University of Leeds
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  • Netherlands Institute of Ecology
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  • VU University Amsterdam
    2
  • University of Glasgow
    2
  • Aarhus University
    2
  • Royal Netherlands Institute for Sea Research
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  • Bielefeld University
    2