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Pollo P, Lagisz M, Yang Y, Culina A, Nakagawa S. Synthesis of sexual selection: a systematic map of meta-analyses with bibliometric analysis. Biol Rev Camb Philos Soc 2024; 99:2134-2175. [PMID: 38982618 DOI: 10.1111/brv.13117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 06/16/2024] [Accepted: 06/19/2024] [Indexed: 07/11/2024]
Abstract
Sexual selection has been a popular subject within evolutionary biology because of its central role in explaining odd and counterintuitive traits observed in nature. Consequently, the literature associated with this field of study became vast. Meta-analytical studies attempting to draw inferences from this literature have now accumulated, varying in scope and quality, thus calling for a synthesis of these syntheses. We conducted a systematic literature search to create a systematic map with a report appraisal of meta-analyses on topics associated with sexual selection, aiming to identify the conceptual and methodological gaps in this secondary literature. We also conducted bibliometric analyses to explore whether these gaps are associated with the gender and origin of the authors of these meta-analyses. We included 152 meta-analytical studies in our systematic map. We found that most meta-analyses focused on males and on certain animal groups (e.g. birds), indicating severe sex and taxonomic biases. The topics in these studies varied greatly, from proximate (e.g. relationship of ornaments with other traits) to ultimate questions (e.g. formal estimates of sexual selection strength), although the former were more common. We also observed several common methodological issues in these studies, such as lack of detailed information regarding searches, screening, and analyses, which ultimately impairs the reliability of many of these meta-analyses. In addition, most of the meta-analyses' authors were men affiliated to institutions from developed countries, pointing to both gender and geographical authorship biases. Most importantly, we found that certain authorship aspects were associated with conceptual and methodological issues in meta-analytical studies. Many of our findings might simply reflect patterns in the current state of the primary literature and academia, suggesting that our study can serve as an indicator of issues within the field of sexual selection at large. Based on our findings, we provide both conceptual and analytical recommendations to improve future studies in the field of sexual selection.
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Affiliation(s)
- Pietro Pollo
- Evolution & Ecology Research Centre, School of Biological, Earth & Environmental Sciences, University of New South Wales, Gate 9 High St., Kensington, Sydney, NSW, 2052, Australia
| | - Malgorzata Lagisz
- Evolution & Ecology Research Centre, School of Biological, Earth & Environmental Sciences, University of New South Wales, Gate 9 High St., Kensington, Sydney, NSW, 2052, Australia
| | - Yefeng Yang
- Evolution & Ecology Research Centre, School of Biological, Earth & Environmental Sciences, University of New South Wales, Gate 9 High St., Kensington, Sydney, NSW, 2052, Australia
| | - Antica Culina
- Ruđer Bošković Institute, Bijenička Cesta 54, Zagreb, 10000, Croatia
| | - Shinichi Nakagawa
- Evolution & Ecology Research Centre, School of Biological, Earth & Environmental Sciences, University of New South Wales, Gate 9 High St., Kensington, Sydney, NSW, 2052, Australia
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2
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Chung MHJ, Mahmud-Al-Hasan M, Jennions MD, Head ML. Effects of inbreeding and elevated rearing temperatures on strategic sperm investment. Behav Ecol 2024; 35:arae044. [PMID: 38903732 PMCID: PMC11187721 DOI: 10.1093/beheco/arae044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 03/24/2024] [Accepted: 06/04/2024] [Indexed: 06/22/2024] Open
Abstract
Males often strategically adjust the number of available sperm based on the social context (i.e. sperm priming response), but it remains unclear how environmental and genetic factors shape this adjustment. In freshwater ecosystems, high ambient temperatures often lead to isolated pools of hotter water in which inbreeding occurs. Higher water temperatures and inbreeding can impair fish development, potentially disrupting sperm production. We used guppies (Poecilia reticulata) to investigate how developmental temperature (26 °C, 30 °C) and male inbreeding status (inbred, outbred) influence their sperm priming response. We also tested if sperm priming was affected by whether the female was a relative (sister) and whether she was inbred or outbred. There was no effect of rearing temperature; male inbreeding status alone determined the number of available sperm in response to female presence, her inbreeding status, and her relatedness. Inbred males produced significantly more sperm in the presence of an unrelated, outbred female than when no female was present. Conversely, outbred males did not alter the number of sperm available in response to female presence or relatedness. Moreover, inbred males produced marginally more sperm when exposed to an unrelated female that was outbred rather than inbred, but there was no difference when exposed to an inbred female that was unrelated versus related. Together, a sperm priming response was only observed in inbred males when exposed to an outbred female. Outbred females in our study were larger than inbred females, suggesting that inbred males strategically allocated ejaculate resources toward females in better condition.
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Affiliation(s)
- Meng-Han Joseph Chung
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Md Mahmud-Al-Hasan
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Michael D Jennions
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia
- Stellenbosch Institute for Advanced Study (STIAS), Wallenberg Centre, Stellenbosch University, Stellenbosch 7600, South Africa
| | - Megan L Head
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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3
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Population Differentiation in Acer platanoides L. at the Regional Scale—Laying the Basis for Effective Conservation of Its Genetic Resources in Austria. FORESTS 2022. [DOI: 10.3390/f13040552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Norway maple (Acer platanoides L.) is a widespread forest tree species in Central and Northern Europe but with a scattered distribution. In the debate on climate change driven changes in species selection in the forest, Norway maple has recently received raised interest because of its comparatively high drought resistance (higher than in sycamore maple). Therefore, it is an interesting species for sites high in carbonates and where other native tree species have become devastated by pathogens (e.g., elm, ash). In Austria, the demand on saplings is currently rising, while there is only very little domestic reproductive material available (on average more than 95% of saplings are imported from neighboring countries). This study was undertaken to identify genetic diversity and population structure of Norway maple in Austria to lay the foundation for the establishment of respective in situ and ex situ conservation measures. In addition, samples from planted stands and imported reproductive material from other countries were included to study the anthropogenic influence on the species in managed forests. We used 11 novel microsatellites to genotype 756 samples from 27 putatively natural Austrian populations, and 186 samples derived from two planted stands and five lots of forest reproductive material; in addition, 106 samples from other European populations were also genotyped. Cross species amplification of the new markers was tested in 19 Acer species from around the world. Population clustering by STRUCTURE analysis revealed a distinct pattern of population structure in Austria and Europe, but overall moderate differentiation. Sibship analysis identifies several populations with severe founding effects, highlighting the need for proper selection of seed sources of sufficient genetic diversity in the species.
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Savage JL, Crane JMS, Hemmings N. Low hatching success in the critically endangered kākāpō is driven by early embryo mortality not infertility. Anim Conserv 2021. [DOI: 10.1111/acv.12746] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- J. L. Savage
- School of Biosciences University of Sheffield Sheffield UK
- School of Biological, Earth and Environmental Sciences University College Cork Cork Ireland
| | - J. M. S. Crane
- Kākāpō Recovery Department of Conservation Invercargill New Zealand
| | - N. Hemmings
- School of Biosciences University of Sheffield Sheffield UK
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5
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FISH and Chimps: Insights into Frequency and Distribution of Sperm Aneuploidy in Chimpanzees ( Pan troglodytes). Int J Mol Sci 2021; 22:ijms221910383. [PMID: 34638739 PMCID: PMC8509033 DOI: 10.3390/ijms221910383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 12/03/2022] Open
Abstract
Numerical chromosomal aberrations in sperm are considered to be a major factor in infertility, early pregnancy loss and syndromes with developmental and cognitive disabilities in mammals, including primates. Despite numerous studies in human and farm animals, the incidence and importance of sperm aneuploidies in non-human primate remains mostly undetermined. Here we investigated the incidence and distribution of sperm aneuploidy in chimpanzees (Pan troglodytes), the species closest to human. We identify evolutionary conserved DNA sequences in human and chimpanzee and selected homologous sub-telomeric regions for all chromosomes to build custom probes and perform sperm-FISH analysis on more than 10,000 sperm nuclei per chromosome. Chimpanzee mean autosomal disomy rate was 0.057 ± 0.02%, gonosomes disomy rate was 0.198% and the total disomy rate was 1.497%. The proportion of X or Y gametes was respectively 49.94% and 50.06% for a ratio of 1.002 and diploidy rate was 0.053%. Our data provide for the first time an overview of aneuploidy in non-human primate sperm and shed new insights into the issues of aneuploidy origins and mechanisms.
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Abstract
Evolutionary rates and strength of selection differ markedly between haploid and diploid genomes. Any genes expressed in a haploid state will be directly exposed to selection, whereas alleles in a diploid state may be partially or fully masked by a homologous allele. This difference may shape key evolutionary processes, including rates of adaptation and inbreeding depression, but also the evolution of sex chromosomes, heterochiasmy, and stable sex ratio biases. All diploid organisms carry haploid genomes, most notably the haploid genomes in gametes produced by every sexually reproducing eukaryote. Furthermore, haploid expression occurs in genes with monoallelic expression, in sex chromosomes, and in organelles, such as mitochondria and plastids. A comparison of evolutionary rates among these haploid genomes reveals striking parallels. Evidence suggests that haploid selection has the potential to shape evolution in predominantly diploid organisms, and taking advantage of the rapidly developing technologies, we are now in the position to quantify the importance of such selection on haploid genomes.
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Affiliation(s)
- Simone Immler
- School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom
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7
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Sakaluk SK, Oldzej J, Poppe CJ, Harper JL, Rines IG, Hampton KJ, Duffield KR, Hunt J, Sadd BM. Effects of inbreeding on life-history traits and sexual competency in decorated crickets. Anim Behav 2019. [DOI: 10.1016/j.anbehav.2019.05.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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8
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Lopes AL, Moreira D, Ferreira MJ, Pereira AM, Coimbra S. Insights into secrets along the pollen tube pathway in need to be discovered. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2979-2992. [PMID: 30820535 DOI: 10.1093/jxb/erz087] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 02/08/2019] [Indexed: 06/09/2023]
Abstract
The process of plant fertilization provides an outstanding example of refined control of gene expression. During this elegant process, subtle communication occurs between neighboring cells, based on chemical signals, that induces cellular mechanisms of patterning and growth. Having faced an immediate issue of self-incompatibility responses, the pathway to fertilization starts once the stigmatic cells recognize a compatible pollen grain, and it continues with numerous players interacting to affect pollen tube growth and the puzzling process of navigation along the transmitting tract. The pollen tube goes through a guidance process that begins with a preovular stage (i.e. prior to the influence of the target ovule), with interactions with factors from the transmitting tissue. In the subsequent ovular-guidance stage a specific relationship develops between the pollen tube and its target ovule. This stage is divided into the funicular and micropylar guidance steps, with numerous receptors working in signalling cascades. Finally, just after the pollen tube has passed beyond the synergids, fusion of the gametes occurs and the developing seed-the ultimate aim of the process-will start to mature. In this paper, we review the existing knowledge of the crucial biological processes involved in pollen-pistil interactions that give rise to the new seed.
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Affiliation(s)
- Ana Lúcia Lopes
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
- Biosystems and Integrative Sciences Institute - BioISI, Porto, Portugal
- Sustainable Agrifood Production Research Centre - GreenUPorto, Vairão, Portugal
| | - Diana Moreira
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
| | - Maria João Ferreira
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
| | - Ana Marta Pereira
- Dipartimento di Bioscienze, Università Degli Studi di Milano, Milano, Italy
| | - Sílvia Coimbra
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
- Sustainable Agrifood Production Research Centre - GreenUPorto, Vairão, Portugal
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9
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Malo AF, Gilbert TC, Riordan P. Drivers of sex ratio bias in the eastern bongo: lower inbreeding increases the probability of being born male. Proc Biol Sci 2019; 286:20190345. [PMID: 31064305 PMCID: PMC6532524 DOI: 10.1098/rspb.2019.0345] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Accepted: 04/14/2019] [Indexed: 01/13/2023] Open
Abstract
Parent sex ratio allocation has consequences for individual fitness, population dynamics, and conservation. Theory predicts that parents should adjust offspring sex ratio when the fitness returns of producing male or female offspring varies. Previous studies have assumed that only mothers are capable of biasing offspring sex ratios, but have neglected fathers, given the expectation of an equal proportion of X- and Y-chromosome-bearing (CBS) sperm in ejaculates due to sex chromosome segregation at meiosis. This assumption has been recently refuted and both paternal fertility and paternal genetic quality have been shown to bias sex ratios. Here, we simultaneously test the relative contribution of paternal, maternal, and individual genetic quality, as measured by inbreeding, on the probability of being born a son or a daughter, using pedigree and lifelong offspring sex ratio data for the eastern bongo ( Tragelaphus eurycerus isaaci). Our models showed first, that surprisingly, as individual inbreeding decreases the probability of being born male increases, second, that paternal genetic effects on sex ratio were stronger than maternal genetic effects (which were absent). Furthermore, paternal effects were opposite in sign to those predicted; father inbreeding increases the probability of having sons. Previous paternal effects have been interpreted as adaptive due to sex-specific inbreeding depression for reproductive traits. We argue that in the eastern bongo, the opposite sign of the paternal effect on sex ratios results from a reversed sex-specific inbreeding depression pattern (present for female but not male reproductive traits). We anticipate that this research will help stimulate research on evolutionary constraints to sex ratios. Finally, the results open a new avenue of research to predict sex ratio allocation in an applied conservation context. Future models of sex ratio allocation should also include the predicted inbreeding level of the offspring and paternal inbreeding levels.
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Affiliation(s)
- Aurelio F. Malo
- GLOCEE - Global Change Ecology and Evolution Group, Department of Life Sciences, Universidad de Alcalá, 28871, Spain
- Department of Zoology, University of Oxford, Oxford OX1 3PS, UK
| | - Tania C. Gilbert
- Marwell Wildlife, Thompsons Lane, Winchester, Hampshire SO21 1JH, UK
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Philip Riordan
- Marwell Wildlife, Thompsons Lane, Winchester, Hampshire SO21 1JH, UK
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
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10
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Aguilar R, Cristóbal‐Pérez EJ, Balvino‐Olvera FJ, Aguilar‐Aguilar M, Aguirre‐Acosta N, Ashworth L, Lobo JA, Martén‐Rodríguez S, Fuchs EJ, Sanchez‐Montoya G, Bernardello G, Quesada M. Habitat fragmentation reduces plant progeny quality: a global synthesis. Ecol Lett 2019; 22:1163-1173. [DOI: 10.1111/ele.13272] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/01/2019] [Accepted: 04/10/2019] [Indexed: 01/22/2023]
Affiliation(s)
- Ramiro Aguilar
- Instituto Multidisciplinario de Biología Vegetal Universidad Nacional de Córdoba –CONICET C.C. 495(X5000JJC)Córdoba Argentina
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - Edson Jacob Cristóbal‐Pérez
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - Francisco Javier Balvino‐Olvera
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - María Aguilar‐Aguilar
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - Natalia Aguirre‐Acosta
- Instituto Multidisciplinario de Biología Vegetal Universidad Nacional de Córdoba –CONICET C.C. 495(X5000JJC)Córdoba Argentina
| | - Lorena Ashworth
- Instituto Multidisciplinario de Biología Vegetal Universidad Nacional de Córdoba –CONICET C.C. 495(X5000JJC)Córdoba Argentina
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - Jorge A. Lobo
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Escuela de Biología Universidad de Costa Rica San Pedro2600 Costa Rica
| | - Silvana Martén‐Rodríguez
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - Eric J. Fuchs
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Escuela de Biología Universidad de Costa Rica San Pedro2600 Costa Rica
| | - Gumersindo Sanchez‐Montoya
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
| | - Gabriel Bernardello
- Instituto Multidisciplinario de Biología Vegetal Universidad Nacional de Córdoba –CONICET C.C. 495(X5000JJC)Córdoba Argentina
| | - Mauricio Quesada
- Laboratorio Nacional de Análisis y Síntesis Ecológica (LANASE) Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
- Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México Morelia Michoacán 58190 México
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11
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Losdat S, Germain RR, Nietlisbach P, Arcese P, Reid JM. No evidence of inbreeding depression in sperm performance traits in wild song sparrows. Ecol Evol 2018; 8:1842-1852. [PMID: 29435258 PMCID: PMC5792576 DOI: 10.1002/ece3.3721] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 09/28/2017] [Accepted: 11/20/2017] [Indexed: 11/14/2022] Open
Abstract
Inbreeding is widely hypothesized to shape mating systems and population persistence, but such effects will depend on which traits show inbreeding depression. Population and evolutionary consequences could be substantial if inbreeding decreases sperm performance and hence decreases male fertilization success and female fertility. However, the magnitude of inbreeding depression in sperm performance traits has rarely been estimated in wild populations experiencing natural variation in inbreeding. Further, the hypothesis that inbreeding could increase within-ejaculate variation in sperm traits and thereby further affect male fertilization success has not been explicitly tested. We used a wild pedigreed song sparrow (Melospiza melodia) population, where frequent extrapair copulations likely create strong postcopulatory competition for fertilization success, to quantify effects of male coefficient of inbreeding (f) on key sperm performance traits. We found no evidence of inbreeding depression in sperm motility, longevity, or velocity, and the within-ejaculate variance in sperm velocity did not increase with male f. Contrary to inferences from highly inbred captive and experimental populations, our results imply that moderate inbreeding will not necessarily constrain sperm performance in wild populations. Consequently, the widely observed individual-level and population-level inbreeding depression in male and female fitness may not stem from reduced sperm performance in inbred males.
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Affiliation(s)
- Sylvain Losdat
- Institute of Biological and Environmental SciencesSchool of Biological SciencesUniversity of AberdeenAberdeenScotland
- Institute of BiologyUniversity of NeuchâtelNeuchâtelSwitzerland
| | - Ryan R. Germain
- Institute of Biological and Environmental SciencesSchool of Biological SciencesUniversity of AberdeenAberdeenScotland
| | - Pirmin Nietlisbach
- Institute of Evolutionary Biology and Environmental StudiesUniversity of ZurichZurichSwitzerland
- Department of ZoologyUniversity of British ColumbiaVancouverBCCanada
| | - Peter Arcese
- Department of Forest and Conservation SciencesUniversity of British ColumbiaVancouverBCCanada
| | - Jane M. Reid
- Institute of Biological and Environmental SciencesSchool of Biological SciencesUniversity of AberdeenAberdeenScotland
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12
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Bocedi G, Reid JM. Feed-backs among inbreeding, inbreeding depression in sperm traits, and sperm competition can drive evolution of costly polyandry. Evolution 2017; 71:2786-2802. [PMID: 28895138 PMCID: PMC5765454 DOI: 10.1111/evo.13363] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 08/28/2017] [Accepted: 08/31/2017] [Indexed: 11/28/2022]
Abstract
Ongoing ambitions are to understand the evolution of costly polyandry and its consequences for species ecology and evolution. Emerging patterns could stem from feed-back dynamics between the evolving mating system and its genetic environment, defined by interactions among kin including inbreeding. However, such feed-backs are rarely considered in nonselfing systems. We use a genetically explicit model to demonstrate a mechanism by which inbreeding depression can select for polyandry to mitigate the negative consequences of mating with inbred males, rather than to avoid inbreeding, and to elucidate underlying feed-backs. Specifically, given inbreeding depression in sperm traits, costly polyandry evolved to ensure female fertility, without requiring explicit inbreeding avoidance. Resulting sperm competition caused evolution of sperm traits and further mitigated the negative effect of inbreeding depression on female fertility. The evolving mating system fed back to decrease population-wide homozygosity, and hence inbreeding. However, the net overall decrease was small due to compound effects on the variances in sex-specific reproductive success and paternity skew. Purging of deleterious mutations did not eliminate inbreeding depression in sperm traits or hence selection for polyandry. Overall, our model illustrates that polyandry evolution, both directly and through sperm competition, might facilitate evolutionary rescue for populations experiencing sudden increases in inbreeding.
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Affiliation(s)
- Greta Bocedi
- School of Biological SciencesUniversity of AberdeenZoology BuildingTillydrone AvenueAberdeen AB24 2TZUnited Kingdom
| | - Jane M. Reid
- School of Biological SciencesUniversity of AberdeenZoology BuildingTillydrone AvenueAberdeen AB24 2TZUnited Kingdom
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13
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Barrett SC, Harder LD. The Ecology of Mating and Its Evolutionary Consequences in Seed Plants. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2017. [DOI: 10.1146/annurev-ecolsys-110316-023021] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Spencer C.H. Barrett
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada
| | - Lawrence D. Harder
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4, Canada
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14
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Marsh JN, Vega-Trejo R, Jennions MD, Head ML. Why does inbreeding reduce male paternity? Effects on sexually selected traits. Evolution 2017; 71:2728-2737. [PMID: 28857148 DOI: 10.1111/evo.13339] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 08/16/2017] [Indexed: 01/17/2023]
Abstract
Mating with relatives has often been shown to negatively affect offspring fitness (inbreeding depression). There is considerable evidence for inbreeding depression due to effects on naturally selected traits, particularly those expressed early in life, but there is less evidence of it for sexually selected traits. This is surprising because sexually selected traits are expected to exhibit strong inbreeding depression. Here, we experimentally created inbred and outbred male mosquitofish (Gambusia holbrooki). Inbred males were the offspring of matings between full siblings. We then investigated how inbreeding influenced a number of sexually selected male traits, specifically: attractiveness, sperm number and velocity, as well as sperm competitiveness based on a male's share of paternity. We found no inbreeding depression for male attractiveness or sperm traits. There was, however, evidence that lower heterozygosity decreased paternity due to reduced sperm competitiveness. Our results add to the growing evidence that competitive interactions exacerbate the negative effects of the increased homozygosity that arises when there is inbreeding.
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Affiliation(s)
- Jason N Marsh
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Regina Vega-Trejo
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Michael D Jennions
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia.,Wissenschaftskolleg zu Berlin, Wallotstaße 19, 14193 Berlin, Germany
| | - Megan L Head
- Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
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15
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Dorado J, Cid RM, Molina A, Hidalgo M, Ariza J, Moreno-Millán M, Demyda-Peyrás S. Effect of inbreeding depression on bull sperm quality and field fertility. Reprod Fertil Dev 2017; 29:712-720. [DOI: 10.1071/rd15324] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 11/09/2015] [Indexed: 12/16/2022] Open
Abstract
The present study investigated the effect of inbreeding depression on sperm quality using automated and objective methods and subsequent effects on beef bull field fertility. Individual inbreeding coefficient (F) values and field fertility data were determined using a dataset of AI bulls belonging to the Spanish Retinta Breeders Association (Asociación Nacional de Criadores de Ganado Vacuno Selecto de Raza Retinta (ANCRE)). Animals were clustered in two groups according to the F values as follows: (1) a high inbreeding group (HI; F ≥ 13.5%, mean 16.3); and (2) a non-inbreeding group (NI; F = 0%). In total, 17 different assessments were performed in both experimental groups, including evaluation of sperm morphology, acrosomal and DNA status, sperm plasma membrane integrity and function (hypo-osmotic swelling test), 10 kinetic parameters and the structure of sperm subpopulations. Sperm morphology, acrosomal and DNA status and osmotic tolerance were similar in both groups. Three velocity parameters (curvilinear velocity, straight line velocity and average path velocity) and the amplitude of lateral head displacement were higher in HI (P < 0.05). Cluster analysis of kinematic parameters revealed three different sperm subpopulations (sP1, sP2 and sP3), with the proportion of the sP1 population (highly active but non-progressive spermatozoa) being significantly (P < 0.05) higher in the HI group. Field fertility was assessed using two calving record datasets. In a smaller database including only bulls evaluated in the present study, there was a significant increase in the calving interval of cows sired with HI bulls. Conversely, in an extended genetic analysis of the ANCRE database, inbreeding only explained a small part of the variation in calving interval, and the results of regression analysis were not significant among bulls. The findings of the present study suggest that high inbreeding levels have a moderate effect on bull semen quality, with an increased percentage of highly active but non-progressive spermatozoa, but only when F values reached a certain threshold. This motility pattern could explain, in part, the higher calving interval produced by inbred bulls under field conditions.
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Wolak ME, Reid JM. Is Pairing with a Relative Heritable? Estimating Female and Male Genetic Contributions to the Degree of Biparental Inbreeding in Song Sparrows (Melospiza melodia). Am Nat 2016; 187:736-52. [DOI: 10.1086/686198] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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17
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Harder LD, Aizen MA, Richards SA. The population ecology of male gametophytes: the link between pollination and seed production. Ecol Lett 2016; 19:497-509. [DOI: 10.1111/ele.12596] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 12/18/2015] [Accepted: 02/08/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Lawrence D. Harder
- Department of Biological Sciences; University of Calgary; Calgary Alberta Canada T2N 1N4
| | - Marcelo A. Aizen
- Laboratorio Ecotono; INIBIOMA-CONICET and Centro Regional Bariloche; Universidad Nacional del Comahue; Quintral 1250 8400 Bariloche Río Negro Argentina
| | - Shane A. Richards
- School of Biological and Biomedical Sciences; Durham University; South Road Durham DH1 3LE UK
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Harder LD, Aizen MA, Richards SA, Joseph MA, Busch JW. Diverse ecological relations of male gametophyte populations in stylar environments. AMERICAN JOURNAL OF BOTANY 2016; 103:484-497. [PMID: 26933012 DOI: 10.3732/ajb.1500269] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 09/08/2015] [Indexed: 06/05/2023]
Abstract
PREMISE OF STUDY Pollen on a stigma represents a local population of male gametophytes vying for access to female gametophytes in the associated ovary. As in most populations, density-independent and density-dependent survival depend on intrinsic characteristics of male gametophytes and environmental (pistil) conditions. These characteristics and conditions could differ among flowers, plants, populations, and species, creating diverse male-gametophyte population dynamics, which can influence seed siring and production. METHODS For nine species, we characterized the relations of both the mean and standard deviation of pollen-tube number at the style base to pollen receipt with nonlinear regression. Models represented asymptotic or peaked relations, providing information about the incidence and magnitude of facilitation and competition, the spatial and temporal characteristics of competition, and the intensity and relative timing of density-independent mortality. KEY RESULTS We infer that pollen tubes of most species competed sequentially, their tips ceasing growth if earlier tubes had depleted stylar space/resources; although two species experienced simultaneous competition. Tube success of three species revealed positive density dependence (facilitation) at low density. For at least four species, density-independent mortality preceded competition. Tube success varied mostly within plants, rather than among plants or conspecific populations. Pollen quality influenced tube success for two of three species; affecting density-independent survival in one and density-dependent performance in the other. CONCLUSIONS The diverse relations of pollen-tube success to pollen receipt evident among just nine species indicate significant contributions of the processes governing pollen germination and tube growth to the reproductive diversity of angiosperms.
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Affiliation(s)
- Lawrence D Harder
- Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 1N4 Canada
| | - Marcelo A Aizen
- Laboratorio Ecotono, INIBIOMA-CONICET and Centro Regional Bariloche, Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Río Negro, Argentina
| | | | - Michael A Joseph
- School of Biological Sciences, Washington State University, PO Box 644236, Pullman, Washington 99164-4236 USA
| | - Jeremiah W Busch
- School of Biological Sciences, Washington State University, PO Box 644236, Pullman, Washington 99164-4236 USA
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19
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Wagner J, Lechleitner M, Hosp D. Pollen limitation is not the rule in nival plants: A study from the European Central Alps. AMERICAN JOURNAL OF BOTANY 2016; 103:375-387. [PMID: 26933013 DOI: 10.3732/ajb.1500214] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 11/09/2015] [Indexed: 06/05/2023]
Abstract
PREMISE OF THE STUDY Seed output of high-mountain plants in the uppermost life zones is highly variable. One possible reason might be pollen limitation due to inadequate pollinator services. METHODS We tested this hypothesis for the insect-pollinated species Cerastium uniflorum, Ranunculus glacialis, and Saxifraga bryoides, which have their distribution center in the subnival and nival zone of the European Central Alps. We recorded insect visitors and determined their impact as pollinators. By analyzing pollination success and seed set following natural and saturating hand pollination, the magnitude of quantitative and qualitative pollen limitation was assessed. KEY RESULTS Anthomyiid and muscid flies had the highest pollination impact for R. glacialis and S. bryoides and syrphids for C. uniflorum. Natural stigma pollen load was highly variable in individual flowers of all species, but in most cases the number of conspecific pollen grains clearly exceeded the number of ovules to be fertilized. There was also a surplus in germinated pollen grains, whereas the pollen tube to ovule ratio was only sufficient in R. glacialis (2.6 on average) and S. bryoides (1.3), but not in C. uniflorum (0.6). Accordingly, seed to ovule ratio was around 0.8 in R. glacialis, 0.7 in S. bryoides but 0.4 in C. uniflorum. In C. uniflorum, saturating pollination slightly increased seed set. Regression analyses revealed that natural pollination success was more frequently limited by quality than by quantity. CONCLUSIONS Our results do not support the idea of chronic, widespread pollen limitation in the subnival but rather fit into the concept of parental optimism by overinvesting in the number of ovules as an adaptation to variable resource availability.
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Affiliation(s)
- Johanna Wagner
- Institute of Botany, Faculty of Biology, University of Innsbruck, Sternwartestraße 15, 6020 Innsbruck, Austria
| | - Martin Lechleitner
- Institute of Botany, Faculty of Biology, University of Innsbruck, Sternwartestraße 15, 6020 Innsbruck, Austria
| | - Daniela Hosp
- Institute of Botany, Faculty of Biology, University of Innsbruck, Sternwartestraße 15, 6020 Innsbruck, Austria
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20
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Castilla AR, Alonso C, Herrera CM. To be or not to be better pollinated: Differences between sex morphs in marginal gynodioecious populations. AMERICAN JOURNAL OF BOTANY 2016; 103:388-395. [PMID: 26928007 DOI: 10.3732/ajb.1500167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 12/01/2015] [Indexed: 06/05/2023]
Abstract
PREMISE OF THE STUDY Changes in the pollinator communities of marginal plant populations can affect their pollination quantity or quality. Geographic variation in pollination success can alter the reproductive advantage that female plants require to persist within gynodioecious populations. Particularly valuable is determining the pollination success at the prezygotic stage in self-compatible gynodioecious species whose females do not exhibit enhanced seed production. METHODS In core and marginal populations of Daphne laureola, we analyzed the differences between hermaphrodites and females in the proportion of flowers visited, the stigma pollen loads, and the quantity of pollen tubes in styles. We also examined the relationship between the number of pollen tubes in styles vs. the number of pollen grains on stigmas using piecewise regression and binomial generalized linear mixed models. KEY RESULTS Pollinators deposited larger pollen loads on flowers in marginal populations. In marginal populations, female flowers received more pollinator visits and more pollen grains on their stigmas, and they had more pollen tubes in their styles than did female flowers in core populations. Both piecewise regression and binomial GLMM analyses showed that females in marginal populations had a lower proportion of grains that developed tubes than females in the core populations, which suggests decreased pollination quality. CONCLUSIONS More efficient pollination services in marginal populations decreased the overall differences in the prezygotic pollination success between the sex morphs. Our results also suggest that pollination quality is lower in females of marginal populations, which could be counteracting the increased pollination in females in marginal populations.
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Affiliation(s)
- Antonio R Castilla
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio s/n 41092 Sevilla, Spain
| | - Conchita Alonso
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio s/n 41092 Sevilla, Spain
| | - Carlos M Herrera
- Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Américo Vespucio s/n 41092 Sevilla, Spain
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21
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Bocedi G, Reid JM. Coevolutionary Feedbacks between Female Mating Interval and Male Allocation to Competing Sperm Traits Can Drive Evolution of Costly Polyandry. Am Nat 2016; 187:334-50. [PMID: 26913946 DOI: 10.1086/684746] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Complex coevolutionary feedbacks between female mating interval and male sperm traits have been hypothesized to explain the evolution and persistence of costly polyandry. Such feedbacks could potentially arise because polyandry creates sperm competition and consequent selection on male allocation to sperm traits, while the emerging sperm traits could create female sperm limitation and, hence, impose selection for increased polyandry. However, the hypothesis that costly polyandry could coevolve with male sperm dynamics has not been tested. We built a genetically explicit individual-based model to simulate simultaneous evolution of female mating interval and male allocation to sperm number versus longevity, where these two sperm traits trade off. We show that evolution of competing sperm traits under polyandry can indeed cause female sperm limitation and, hence, promote further evolution and persistence of costly polyandry, particularly when sperm are costly relative to the degree of female sperm limitation. These feedbacks were stronger, and greater polyandry evolved, when postcopulatory competition for paternity followed a loaded rather than fair raffle and when sperm traits had realistically low heritability. We therefore demonstrate that the evolution of allocation to sperm traits driven by sperm competition can prevent males from overcoming female sperm limitation, thereby driving ongoing evolution of costly polyandry.
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22
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Opatová P, Ihle M, Albrechtová J, Tomášek O, Kempenaers B, Forstmeier W, Albrecht T. Inbreeding depression of sperm traits in the zebra finch Taeniopygia guttata. Ecol Evol 2015; 6:295-304. [PMID: 26811793 PMCID: PMC4716522 DOI: 10.1002/ece3.1868] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 11/05/2015] [Accepted: 11/06/2015] [Indexed: 11/08/2022] Open
Abstract
Inbreeding depression, or the reduction in fitness due to mating between close relatives, is a key issue in biology today. Inbreeding negatively affects many fitness‐related traits, including survival and reproductive success. Despite this, very few studies have quantified the effects of inbreeding on vertebrate gamete traits under controlled breeding conditions using a full‐sib mating approach. Here, we provide comprehensive evidence for the negative effect of inbreeding on sperm traits in a bird, the zebra finch Taeniopygia guttata. We compared sperm characteristics of both inbred (pedigree F = 0.25) and outbred (pedigree F = 0) individuals from two captive populations, one domesticated and one recently wild‐derived, raised under standardized conditions. As normal spermatozoa morphology did not differ consistently between inbred and outbred individuals, our study confirms the hypothesis that sperm morphology is not particularly susceptible to inbreeding depression. Inbreeding did, however, lead to significantly lower sperm motility and a substantially higher percentage of abnormal spermatozoa in ejaculate. These results were consistent across both study populations, confirming the generality and reliability of our findings.
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Affiliation(s)
- Pavlína Opatová
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 267/2CZ-61137 Brno Czech Republic
| | - Malika Ihle
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard-Gwinner-Strasse 7 82319 Seewiesen Germany
| | - Jana Albrechtová
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Charles University in Prague Faculty of Sciences Department of Zoology Viničná 7CZ-12844 Prague Czech Republic
| | - Oldřich Tomášek
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Charles University in Prague Faculty of Sciences Department of Zoology Viničná 7CZ-12844 Prague Czech Republic
| | - Bart Kempenaers
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard-Gwinner-Strasse 7 82319 Seewiesen Germany
| | - Wolfgang Forstmeier
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard-Gwinner-Strasse 7 82319 Seewiesen Germany
| | - Tomáš Albrecht
- Institute of Vertebrate Biology Academy of Sciences of the Czech Republic v.v.i. Květná 8CZ-603 65 Brno Czech Republic; Charles University in Prague Faculty of Sciences Department of Zoology Viničná 7CZ-12844 Prague Czech Republic
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23
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Losdat S, Arcese P, Sampson L, Villar N, Reid JM. Additive genetic variance and effects of inbreeding, sex and age on heterophil to lymphocyte ratio in song sparrows. Funct Ecol 2015. [DOI: 10.1111/1365-2435.12586] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Sylvain Losdat
- School of Biological Sciences Institute of Biological and Environmental Sciences University of Aberdeen Tillydrone Avenue Zoology Building Aberdeen AB24 2TZ UK
- Institute of Ecology and Evolution University of Bern Baltzerstrasse 6 3012 Bern Switzerland
| | - Peter Arcese
- Department of Forest and Conservation Sciences University of British Columbia 2424 Main Mall Vancouver BC V6T 1Z4 Canada
| | - Laura Sampson
- Grupo de Investigación en Ecología Animal Universidad del Valle Calle 13 N.# 100‐00 Cali Colombia
| | - Nacho Villar
- School of Biological Sciences Institute of Biological and Environmental Sciences University of Aberdeen Tillydrone Avenue Zoology Building Aberdeen AB24 2TZ UK
| | - Jane M. Reid
- School of Biological Sciences Institute of Biological and Environmental Sciences University of Aberdeen Tillydrone Avenue Zoology Building Aberdeen AB24 2TZ UK
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Heterosis Increases Fertility, Fecundity, and Survival of Laboratory-Produced F1 Hybrid Males of the Malaria Mosquito Anopheles coluzzii. G3-GENES GENOMES GENETICS 2015; 5:2693-709. [PMID: 26497140 PMCID: PMC4683642 DOI: 10.1534/g3.115.021436] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The success of vector control strategies aiming to decrease disease transmission via the release of sterile or genetically-modified male mosquitoes critically depends on mating between laboratory-reared males and wild females. Unfortunately, mosquito colonization, laboratory rearing, and genetic manipulations can all negatively affect male competitiveness. Heterosis is commonly used to produce domestic animals with enhanced vigor and homogenous genetic background and could therefore potentially improve the mating performance of mass-reared male mosquitoes. Here, we produced enhanced hybrid males of the malaria mosquito Anopheles coluzzii by crossing two strains colonized >35 and 8 years ago. We compared the amount of sperm and mating plug proteins they transferred to females, as well as their insemination rate, reproductive success and longevity under various experimental conditions. Across experiments, widespread adaptations to laboratory mating were detected in the older strain. In large-group mating experiments, no overall hybrid advantage in insemination rates and the amount of sperm and accessory gland proteins transferred to females was detected. Despite higher sperm activity, hybrid males did not appear more fecund. However, individual-male mating and laboratory-swarm experiments revealed that hybrid males, while inseminating fewer females than older inbred males, were significantly more fertile, producing larger mating plugs and drastically increasing female fecundity. Heterotic males also showed increased longevity. These results validate the use of heterosis for creating hybrid males with improved fitness from long-established inbred laboratory strains. Therefore, this simple approach could facilitate disease control strategies based on male mosquito releases with important ultimate benefits to human health.
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25
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Qu LJ, Li L, Lan Z, Dresselhaus T. Peptide signalling during the pollen tube journey and double fertilization. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:5139-50. [PMID: 26068467 DOI: 10.1093/jxb/erv275] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Flowering seed plants (angiosperms) have evolved unique ways to protect their gametes from pathogen attack and from drying out. The female gametes (egg and central cell) are deeply embedded in the maternal tissues of the ovule inside the ovary, while the male gametes (sperm cells) are enclosed in the vegetative pollen tube cell. After germination of the pollen tube at the surface of papilla cells of the stigma the two immobile sperm cells are transported deep inside the sporophytic maternal tissues to be released inside the ovule for double fertilization. Angiosperms have evolved a number of hurdles along the pollen tube journey to prevent inbreeding and fertilization by alien sperm cells, and to maximize reproductive success. These pre-zygotic hybridization barriers require intensive communication between the male and female reproductive cells and the necessity to distinguish self from non-self interaction partners. General molecules such as nitric oxide (NO) or gamma-aminobutyric acid (GABA) therefore appear to play only a minor role in these species-specific communication events. The past 20 years have shown that highly polymorphic peptides play a leading role in all communication steps along the pollen tube pathway and fertilization. Here we review our current understanding of the role of peptides during reproduction with a focus on peptide signalling during self-incompatibility, pollen tube growth and guidance as well as sperm reception and gamete activation.
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Affiliation(s)
- Li-Jia Qu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Ling Li
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Zijun Lan
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Thomas Dresselhaus
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93053 Regensburg, Germany
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26
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Losdat S, Arcese P, Reid JM. Double decomposition: decomposing the variance in subcomponents of male extra-pair reproductive success. J Anim Ecol 2015; 84:1384-95. [DOI: 10.1111/1365-2656.12389] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 05/06/2015] [Indexed: 01/09/2023]
Affiliation(s)
- Sylvain Losdat
- Institute of Biological and Environmental Sciences; School of Biological Sciences; Zoology Building; University of Aberdeen; Tillydrone Avenue Aberdeen AB24 2TZ UK
| | - Peter Arcese
- Department of Forest and Conservation Sciences; University of British Columbia; 2424 Main Mall Vancouver BC V6T 1Z4 Canada
| | - Jane M. Reid
- Institute of Biological and Environmental Sciences; School of Biological Sciences; Zoology Building; University of Aberdeen; Tillydrone Avenue Aberdeen AB24 2TZ UK
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