9 Works

Data from: Sperm competition games: a general model for pre-copulatory male-male competition

Geoff A. Parker, Catherine M. Lessells & Leigh W. Simmons
Reproductive males face a trade-off between expenditure on pre-copulatory male-male competition – increasing the number of females that they secure as mates – and sperm competition – increasing their fertilisation success with those females. Previous sperm allocation models have focused on scramble competition in which males compete by searching for mates and the number of matings rises linearly with pre-copulatory expenditure. However, recent studies have emphasised contest competition involving pre-copulatory expenditure on armaments, where winning...

Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus

Jan M. Strugnell, Phill C. Watts, Peter J. Smith & A. Louise Allcock
Repeated cycles of glaciation have had major impacts on the distribution of genetic diversity of the Antarctic marine fauna. During glacial periods, ice cover limited the amount of benthic habitat on the continental shelf. Conversely, more habitat and possibly altered seaways, were available during interglacials when the ice receded and the sea level was higher. We used microsatellites and partial sequences of the mitochondrial cytochrome oxidase c subunit 1 (MT-CO1) gene to examine genetic structure...

Data from: Sperm competition roles and ejaculate investment in a promiscuous mammal

Jean-François Lemaître, Steven A. Ramm, Jane L. Hurst & Paula Stockley
Theoretical models of sperm competition predict how males should allocate sperm and seminal fluid components to ejaculates according to their mating role (dominant vs. subordinate). Here we present a detailed analysis of ejaculate expenditure according to male roles in the bank vole (Myodes glareolus). Sperm competition occurs regularly in this species and dominant males typically achieve higher fertilisation success than subordinates. Contrary to theoretical predictions, we found that dominant male bank voles invest more sperm...

Data from: Linkage map of the peppered moth, Biston betularia (Lepidoptera, Geometridae): a model of industrial melanism

Arjen E. Van't Hof, Petr Nguyen, Martina Dalíková, Nicola Edmonds, František Marec & Ilik J. Saccheri
We have constructed a linkage map for the peppered moth (Biston betularia), the classical ecological genetics model of industrial melanism, aimed both at localizing the network of loci controlling melanism and making inferences about chromosome dynamics. The linkage map, which is based primarily on amplified fragment length polymorphisms (AFLPs) and genes, consists of 31 linkage groups (LGs; consistent with the karyotype). Comparison with the evolutionarily distant Bombyx mori suggests that the gene content of chromosomes...

Data from: Detecting genes for variation in parasite burden and immunological traits in a wild population: testing the candidate gene approach

Emily A. Brown, Jill G. Pilkington, Dan H. Nussey, Kathryn A. Watt, Adam D. Hayward, Rachel Tucker, Andrea L. Graham, Steve Paterson, Dario Beraldi, Josephine M. Pemberton & Jon Slate
Identifying the genes underlying phenotypic variation in natural populations can provide novel insight into the evolutionary process. Here we test the candidate gene approach to identifying loci involved in variation in gastrointestinal parasite burden, in a wild population of Soay sheep. A comprehensive literature review, Gene Ontology databases, and comparative genomics resources were used to generate a list of candidate genes. In a pilot study these candidates, along with 50 random genes, were then sequenced...

Data from: Selective bird predation on the peppered moth: the last experiment of Michael Majerus

Laurence M. Cook, Bruce S. Grant, Ilik J. Saccheri & James Mallet
Colour variation in the peppered moth Biston betularia was long accepted to be under strong natural selection. Melanics were believed to be fitter than pale morphs because of lower predation at daytime resting sites on dark, sooty bark. Melanics became common during the industrial revolution, but since 1970 there has been a rapid reversal, assumed to have been caused by predators selecting against melanics resting on today's less sooty bark. Recently, these classical explanations of...

Data from: Adaptive evolution of C4 photosynthesis through recurrent lateral gene transfer

Pascal-Antoine Christin, Erika J. Edwards, Guillaume Besnard, Susanna F. Boxall, Richard Gregory, Elizabeth A. Kellogg, Colin P. Osborne & James Hartwell
C4 photosynthesis is a complex trait that confers higher productivity under warm and arid conditions. It has evolved more than 60 times via the co-option of genes present in C3 ancestors followed by alteration of the patterns and levels of expression, and adaptive changes in the coding sequences, but the evolutionary path to C4 photosynthesis is still poorly understood. The grass lineage Alloteropsis offers unparalleled opportunities for studying C4 evolution, because it includes a C3...

Data from: How to measure maturation: a comparison of probabilistic methods used to test for genotypic variation and plasticity in the decision to mature

Ewan Douglas Harney, Tom J. M. Van Dooren, Steve Paterson & Stewart J. Plaistow
Maturation is a developmental trait that plays a key role in shaping organisms’ life-history. However, progress in understanding how maturation phenotypes evolve has been held back by confusion over how best to model maturation decisions and a lack of studies comparing genotypic variation in maturation. Here, we fitted probabilistic maturation reaction norms (PMRNs) to data collected from five clones of Daphnia magna and five of Daphnia pulex collected from within and between different populations. We...

Data from: Complex life cycles: why refrain from growth before reproduction in the adult niche?

Daniel P. Benesh, James C. Chubb & Geoff A. Parker
Organisms with complex life cycles occupy distinct niches as larvae and adults. One presumed advantage of this is the ability to exploit different resources successively throughout ontogeny. Various taxa, however, have evolved non-feeding, non-growing adult stages. We show theoretically that this counterintuitive 'no-growth' strategy is favored when the optimal larval size is greater than or equal to the optimal adult size for reproduction. We empirically investigated this in a group of parasitic worms (helminths). Helminths...

Registration Year

  • 2012
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Resource Types

  • Dataset
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Affiliations

  • University of Liverpool
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  • University of Sheffield
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  • Princeton University
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  • Nederlands Instituut voor Ecologie
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  • La Trobe University
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  • University of Manchester
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  • University College London
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  • University of Missouri
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  • Institute of Entomology
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