15 Works

Data from: Mate competition and resource competition are inter-related in sexual selection

Sebastian Wacker & Trond Amundsen
Sexual selection can be affected by the competition for limited breeding resources and/or the competition for limited mates. Although there is ample evidence for each type of competition by itself, little is known about their relative importance and interaction. To address these questions, we established 48 experimental breeding populations of the two-spotted goby (Gobiusculus flavescens), a substrate-breeding fish with paternal care. In three experimental treatments, males were limited in the access to either nest sites...

Data from: Allometric constraints and the evolution of allometry

Kjetil Lysne Voje, Thomas F. Hansen, Camilla K. Egset, Geir H. Bolstad & Christophe Pélabon
Morphological traits often covary within and among species according to simple power laws referred to as allometry. Such allometric relationships may result from common growth regulation, and this has given rise to the hypothesis that allometric exponents may have low evolvability and constrain trait evolution. We formalize hypotheses for how allometry may constrain morphological trait evolution across taxa, and test these using more than 300 empirical estimates of static (within-species) allometric relations of animal morphological...

Data from: Cryptic choice of conspecific sperm controlled by the impact of ovarian fluid on sperm swimming behaviour

Sarah Elizabeth Yeates, Sian Elizabeth Diamond, Sigurd Einum, Brent C. Emerson, William V. Holt & Matthew J. G. Gage
Despite evidence that variation in male-female reproductive compatibility exists in many fertilization systems, identifying mechanisms of cryptic female choice at the gamete level has been a challenge. Here, under risks of genetic incompatibility through hybridization, we show how salmon and trout eggs promote fertilization by conspecific sperm. Using in vitro fertilization experiments that replicate the gametic micro-environment, we find complete inter-fertility between both species. However, if either species’ ova were presented with equivalent numbers of...

Data from: To breed or not to breed: endocrine response to mercury contamination by an Arctic seabird

Sabrina Tartu, Aurélie Goutte, Paco Bustamante, Frédéric Angelier, Børge Moe, Céline Clément-Chastel, Claus Bech, Geir Wing Gabrielsen, Jan Ove Bustnes & Olivier Chastel
Mercury, a ubiquitous toxic element, is known to alter expression of sex steroids and to impair reproduction across vertebrates but the mechanisms underlying these effects are not clearly identified. We examined whether contamination by mercury predicts the probability to skip reproduction in black-legged kittiwakes (Rissa tridactyla) from Svalbard. We also manipulated the endocrine system to investigate the mechanism underlying this relationship. During the pre-laying period, we injected exogenous GnRH (gonadotropin-releasing hormone) to test the ability...

Data from: Persistent organic pollution in a high-Arctic top predator: sex-dependent thresholds in adult survival

Kjell Einar Erikstad, Hanno Sandvik, Tone Kristin Reiertsen, Jan Ove Bustnes, Hallvard Strøm & H. Strom
In long-lived species, any negative effect of pollution on adult survival may pose serious hazards to breeding populations. In the present study we measured concentrations of various organochlorines (OCs: PCB and organochlorine pesticides) in the blood of a large number of adult glaucous gulls (Larus hyperboreus) breeding on Bjørnøya (Bear Island) in the Norwegian Arctic, and modelled their local survival using capture–recapture analysis. Survival was negatively associated with concentrations of OCs in the blood. The...

Data from: Operational sex ratio but not density affects sexual selection in a fish

Sebastian Wacker, Kenyon Mobley, Elisabet Forsgren, Lise Cats Myhre, Karen De Jong & Trond Amundsen
The operational sex ratio (OSR) and density are considered important factors affecting the strength of sexual selection. While there is increasing evidence that OSR and density affect the potential for sexual selection, few studies have addressed whether this is realized in phenotypic selection and how the two factors interact. We manipulated OSR (three levels) and male density (two levels) in 36 experimental breeding populations of Gobiusculus flavescens – a fish with paternal care. We measured...

Data from: Migration and stress during reproduction govern telomere dynamics in a seabird

Jannik Schultner, Børge Moe, Olivier Chastel, Claus Bech & Alexander S. Kitaysky
Changes in telomere length are believed to reflect changes in physiological state and life expectancy in animals. However, much remains unknown about the determinants of telomere dynamics in wild populations, and specifically the influence of conditions during highly mobile life-history stages, for example migration. We tested whether telomere dynamics were associated with migratory behaviour and/or with stress during reproduction in free-living seabirds. We induced short-term stress during reproduction in chick-rearing, black-legged kittiwakes (Rissa tridactyla), tracked...

Data from: Multiple aspects of plasticity in clutch size vary among populations of a globally distributed songbird

David F. Westneat, Veronika Bókony, Terry Burke, Olivier Chastel, Henrik Jensen, Thomas Kvalnes, Ádám Z. Lendvai, András Liker, Douglas Mock, Julia Schroeder, P. L. Schwagmeyer, Gabriele Sorci & Ian R. K. Stewart
1. Plasticity in life-history characteristics can influence many ecological and evolutionary phenomena, including how invading organisms cope with novel conditions in new locations or how environmental change affects organisms in native locations. Variation in reaction norm attributes is a critical element to understanding plasticity in life history, yet we know relatively little about the ways in which reaction norms vary within and among populations. 2. We amassed data on clutch size from marked females in...

Data from: Genetic variation and structure of house sparrow populations: is there an island effect?

Henrik Jensen, Rune Moe, Ingerid Hagen, Anna Holand, Jaana Kekkonen, Jarle Tufto, Bernt-Erik Sæther, Ingerid Julie Hagen, Anna Marie Holand & Bernt-Erik Saether
Population genetic structure and intrapopulation levels of genetic variation have important implications for population dynamics and evolutionary processes. Habitat fragmentation is one of the major threats to biodiversity. It leads to smaller population sizes and reduced gene flow between populations and will thus also affect genetic structure. We use a natural system of island and mainland populations of house sparrows along the coast of Norway to characterize the different population genetic properties of fragmented populations....

Data from: Successive invasion-mediated interspecific hybridizations and population structure in the endangered cichlid Oreochromis mossambicus

Cyril Firmat, Paul Alibert, Michèle Losseau, Jean-François Baroiller & Ulrich K. Schliewen
Hybridization between invasive and native species accounts among the major and pernicious threats to biodiversity. The Mozambique tilapia Oreochromis mossambicus, a widely used freshwater aquaculture species, is especially imperiled by this phenomenon since it is recognized by the IUCN as an endangered taxon due to genetic admixture with O. niloticus an invasive congeneric species. The Lower Limpopo and the intermittent Changane River (Mozambique) drain large wetlands of potentially great importance for conservation of O. mossambicus,...

Data from: Visual phenotype matching: cues to paternity are present in rhesus macaque faces

Anahita J. N. Kazem & Anja Widdig
The ability to recognize kin and thus behaviourally discriminate between conspecifics based on genetic relatedness is of importance both in acquiring inclusive fitness benefits and to enable optimal inbreeding. In primates, mechanisms allowing recognition of paternal relatives are of particular interest, given that in these mating systems patrilineal information is unlikely to be available via social familiarity. Humans use visual phenotype matching based on facial features to identify their own and other's close relatives, and...

Data from: Spatial variation in the relationship between performance and metabolic rate in wild juvenile Atlantic salmon

Grethe Robertsen, John D. Armstrong, Keith H. Nislow, Ivar Herfindal, Simon McKelvey & Sigurd Einum
1. Maintenance metabolic rate (MR, the energy cost of self-maintenance) is linked to behavioural traits and fitness and varies substantially within populations. Despite having received much attention, the causes and consequences of this variation remain obscure. 2. Theoretically, such within-population variation in fitness-related traits can be maintained by environmental heterogeneity in selection patterns, but for MR this has rarely been tested in nature. 3. Here, we experimentally test if the relationship between MR and performance...

Data from: Sex ratio and density affect sexual selection in a sex-role reversed fish

Tonje Aronsen, Anders Berglund, Kenyon B. Mobley, Irja Ida Ratikainen & Gunilla Rosenqvist
Understanding how demographic processes influence mating systems is important to decode ecological influences on sexual selection in nature. We manipulated sex ratio and density in experimental populations of the sex-role reversed pipefish Syngnathus typhle. We quantified sexual selection using the Bateman gradient (ß′ss), the opportunity for selection (I), and sexual selection (Is), and the maximum standardized sexual selection differential (s′max). We also measured selection on body length using standardized selection differentials (s′) and mating differentials...

Data from: Population growth in a wild bird is buffered against phenological mismatch

Thomas E. Reed, Vidar Grotan, Stephanie Jenouvrier, Bernt-Erik Saether & Marcel E. Visser
Broad-scale environmental changes are altering patterns of natural selection in the wild, but few empirical studies have quantified the demographic cost of sustained directional selection in response to these changes. We tested whether population growth in a wild bird is negatively affected by climate change–induced phenological mismatch, using almost four decades of individual-level life-history data from a great tit population. In this population, warmer springs have generated a mismatch between the annual breeding time and...

Data from: The effects of sexual selection on life history traits: an experimental study on guppies

Christophe Pélabon, Line K. Larsen, Geir H. Bolstad, Åslaug Viken, Ian A. Fleming & Gunilla Rosenqvist
Sexual selection is often prevented during captive breeding in order to maximize effective population size and retain genetic diversity. However, enforcing monogamy and thereby preventing sexual selection may affect population fitness either negatively by preventing the purging of deleterious mutations or positively by reducing sexual conflicts. To better understand the effect of sexual selection on the fitness of small populations, we compared components of female fitness and the expression of male secondary sexual characters in...

Registration Year

  • 2013

Resource Types

  • Dataset


  • Norwegian University of Science and Technology
  • Norwegian Institute for Nature Research
  • French National Centre for Scientific Research
  • Norwegian Polar Institute
  • University of Sheffield
  • Centre d'Etudes Biologiques de Chizé
  • Northern Research Station
  • University of Nottingham
  • Nederlands Instituut voor Ecologie
  • University of Alaska Fairbanks