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https://www.readbyqxmd.com/read/28419447/divergence-and-evolution-of-assortative-mating-in-a-polygenic-trait-model-of-speciation-with-gene-flow
#1
Himani Sachdeva, Nicholas H Barton
Assortative mating is an important driver of speciation in populations with gene flow and is predicted to evolve under certain conditions in few-locus models. However, the evolution of assortment is less understood for mating based on quantitative traits, which are often characterized by high genetic variability and extensive linkage disequilibrium between trait loci. We explore this scenario for a two-deme model with migration, by considering a single polygenic trait subject to divergent viability selection across demes, as well as assortative mating and sexual selection within demes, and investigate how trait divergence is shaped by various evolutionary forces...
April 17, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28406167/persistence-of-a-sugar-rejecting-cockroach-genotype-under-various-dietary-regimes
#2
Kim Jensen, Ayako Wada-Katsumata, Coby Schal, Jules Silverman
Glucose-aversion is a heritable trait that evolved in a number of German cockroach (Blattella germanica L.) populations in response to strong selection with glucose-containing insecticide baits. However, in the absence of glucose-containing bait, glucose-averse (GA) cockroaches have lower performance than wild-type (WT) cockroaches in several fitness-determining traits. We allocated 48 caged populations initiated with homozygous GA and WT adults to four dietary treatments consisting of either pure rodent chow, rodent chow mixed to yield a content of either 20% glucose or 20% fructose, or a treatment consisting of choice between the 20% glucose- and the 20% fructose-containing food...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28405273/assortative-mating-by-colored-ornaments-in-blue-tits-space-and-time-matter
#3
Amélie Fargevieille, Arnaud Grégoire, Anne Charmantier, Maria Del Rey Granado, Claire Doutrelant
Assortative mating is a potential outcome of sexual selection, and estimating its level is important to better understand local adaptation and underlying trait evolution. However, assortative mating studies frequently base their conclusions on small numbers of individuals sampled over short periods of time and limited spatial scales even though spatiotemporal variation is common. Here, we characterized assortative mating patterns over 10 years in four populations of the blue tit (Cyanistes caeruleus), a passerine bird...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28384154/structured-mating-patterns-and-implications
#4
Ronnie Sebro, Gina M Peloso, Josée Dupuis, Neil J Risch
Genetic similarity of spouses can reflect factors influencing mate choice, such as physical/behavioral characteristics, and patterns of social endogamy. Spouse correlations for both genetic ancestry and measured traits may impact genotype distributions (Hardy Weinberg and linkage equilibrium), and therefore genetic association studies. Here we evaluate white spouse-pairs from the Framingham Heart Study (FHS) original and offspring cohorts (N = 124 and 755, respectively) to explore spousal genetic similarity and its consequences...
April 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28382882/mating-system-mate-choice-and-parental-care-in-a-bark-beetle
#5
O Baruch, Z Mendel, I Scharf, A R Harari
The cypress bark beetle, Phloeosinus armatus, is a common element of the dying cypress tree system in East-Mediterranean countries. Adult beetles congregate for breeding on this ephemeral resource. We studied three traits that characterize this beetle's sexual behavior and linked them to its reproductive success: mating system, mate choice, and parental care. We found that the females are the 'pioneering sex', excavating the mating chamber. The average female is slightly larger than the male, and female and male body size is correlated, demonstrating size-assortative mating...
April 6, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28356540/population-genetics-of-immune-related-multilocus-copy-number-variation-in-native-americans
#6
Luciana W Zuccherato, Silvana Schneider, Eduardo Tarazona-Santos, Robert J Hardwick, Douglas E Berg, Helen Bogle, Mateus H Gouveia, Lee R Machado, Moara Machado, Fernanda Rodrigues-Soares, Giordano B Soares-Souza, Diego L Togni, Roxana Zamudio, Robert H Gilman, Denise Duarte, Edward J Hollox, Maíra R Rodrigues
While multiallelic copy number variation (mCNV) loci are a major component of genomic variation, quantifying the individual copy number of a locus and defining genotypes is challenging. Few methods exist to study how mCNV genetic diversity is apportioned within and between populations (i.e. to define the population genetic structure of mCNV). These inferences are critical in populations with a small effective size, such as Amerindians, that may not fit the Hardy-Weinberg model due to inbreeding, assortative mating, population subdivision, natural selection or a combination of these evolutionary factors...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28345625/assortative-mating-encounter-network-topology-and-the-evolution-of-attractiveness
#7
S Dipple, T Jia, T Caraco, G Korniss, B K Szymanski
We model a social-encounter network where linked nodes match for reproduction in a manner depending probabilistically on each node's attractiveness. The developed model reveals that increasing either the network's mean degree or the "choosiness" exercised during pair formation increases the strength of positive assortative mating. That is, we note that attractiveness is correlated among mated nodes. Their total number also increases with mean degree and selectivity during pair formation. By iterating over the model's mapping of parents onto offspring across generations, we study the evolution of attractiveness...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338099/difference-in-diel-mating-time-contributes-to-assortative-mating-between-host-plant-associated-populations-of-chilo-suppressalis
#8
Wei-Li Quan, Wen Liu, Rui-Qi Zhou, Rong Chen, Wei-Hua Ma, Chao-Liang Lei, Xiao-Ping Wang
Behavioral isolation in animals can be mediated by inherent mating preferences and assortative traits, such as divergence in the diel timing of mating activity. Although divergence in the diel mating time could, in principle, promote the reproductive isolation of sympatric, conspecific populations, there is currently no unequivocal evidence of this. We conducted different mate-choice experiments to investigate the contribution of differences in diel mating activity to the reproductive isolation of the rice and water-oat populations of Chilo suppressalis...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337988/molecular-heterogeneity-in-major-urinary-proteins-of-mus-musculus-subspecies-potential-candidates-involved-in-speciation
#9
Jane L Hurst, Robert J Beynon, Stuart D Armstrong, Amanda J Davidson, Sarah A Roberts, Guadalupe Gómez-Baena, Carole M Smadja, Guila Ganem
When hybridisation carries a cost, natural selection is predicted to favour evolution of traits that allow assortative mating (reinforcement). Incipient speciation between the two European house mouse subspecies, Mus musculus domesticus and M.m.musculus, sharing a hybrid zone, provides an opportunity to understand evolution of assortative mating at a molecular level. Mouse urine odours allow subspecific mate discrimination, with assortative preferences evident in the hybrid zone but not in allopatry. Here we assess the potential of MUPs (major urinary proteins) as candidates for signal divergence by comparing MUP expression in urine samples from the Danish hybrid zone border (contact) and from allopatric populations...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28289773/temporal-variation-in-size-assortative-mating-and-male-mate-choice-in-a-spider-with-amphisexual-care
#10
Rafael R Moura, Marcelo O Gonzaga
Males should be more selective when they have a high investment in reproduction, especially in species with biparental or paternal care. In this context, male mate choice can promote size-assortative mating (SAM) when (1) large males win intrasexual disputes, (2) large females are more fecund, and (3) males prefer larger females to smaller ones. In the spider Manogea porracea, males exhibit high reproductive investment by building their webs above those of females and exhibiting extended care of offspring in the absence of females...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28245824/alternative-reproductive-tactics-and-inverse-size-assortment-in-a-high-density-fish-spawning-aggregation
#11
Rucha Karkarey, Amod Zambre, Kavita Isvaran, Rohan Arthur
BACKGROUND: At high densities, terrestrial and marine species often employ alternate reproductive tactics (ARTs) to maximize reproductive benefits. We describe ARTs in a high-density and unfished spawning aggregation of the squaretail grouper (Plectropomus areolatus) in Lakshadweep, India. RESULTS: As previously reported for this species, territorial males engage in pair-courtship, which is associated with a pair-spawning tactic. Here, we document a previously unreported school-courtship tactic; where territorial males court multiple females in mid-water schools, which appears to culminate in a unique 'school-spawning' tactic...
February 28, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28205222/strong-amerindian-mitonuclear-discordance-in-puerto-rican-genomes-suggests-amerindian-mitochondrial-benefit
#12
Steven E Massey
A large discrepancy between the Amerindian contribution to the mitochondrial and nuclear genetic components of 55 Puerto Rican (PR) genomes from the 1000 Genomes Project is identified, with Amerindian mitochondrial haplotypes being highly represented (67.3%), in strong contrast to the Amerindian autosomal contribution (12.9%). I examine the potential causes behind this strong mitonuclear discordance. The Amerindian contribution to the X chromosome is 19.8%, implying assortative mating with Amerindian females during the establishment of the PR population...
March 2017: Annals of Human Genetics
https://www.readbyqxmd.com/read/28202807/the-genetics-of-mate-preferences-in-hybrids-between-two-young-and-sympatric-lake-victoria-cichlid-species
#13
Ola Svensson, Katie Woodhouse, Cock van Oosterhout, Alan Smith, George F Turner, Ole Seehausen
The genetic architecture of mate preferences is likely to affect significant evolutionary processes, including speciation and hybridization. Here, we investigate laboratory hybrids between a pair of sympatric Lake Victoria cichlid fish species that appear to have recently evolved from a hybrid population between similar predecessor species. The species demonstrate strong assortative mating in the laboratory, associated with divergent male breeding coloration (red dorsum versus blue). We show in a common garden experiment, using DNA-based paternity testing, that the strong female mate preferences among males of the two species are fully recovered in a large fraction of their F2 hybrid generation...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28202469/establishment-and-maintenance-of-sexual-preferences-that-cause-a-reproductive-isolation-between-medaka-strains-in-close-association
#14
Mayuka Ikawa, Emi Ohya, Hiroka Shimada, Makiko Kamijo, Shoji Fukamachi
Animals choose reproductive partners based on their sexual preferences which are established at a certain time point before, during, or after sexual maturation. The preferences are often divergent within a species, which suppresses gene flow between populations and may promote speciation. There are two strains of medaka (Oryzias latipes) that differ by a single transgene and mate assortatively depending on skin color. Here, we demonstrate that symmetrically biased (mutually exclusive) sexual preferences are (1) gradually established during growth depending on skin color and the color of surrounding fish, (2) strong enough to minimize gene flow between the strains at a population level, and (3) inflexibly retained after sexual maturation, even after weeks of daily mating with partners of the other strain...
February 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28192145/population-based-familial-aggregation-of-eosinophilic-esophagitis-suggests-a-genetic-contribution
#15
Kristina Allen-Brady, Rafael Firszt, John C Fang, Jathine Wong, Ken R Smith, Kathryn A Peterson
BACKGROUND: Prior familial clustering studies have observed an increased risk of eosinophilic esophagitis (EoE) mostly among first-degree relatives, suggesting a genetic contribution to EoE, and twin studies have suggested a powerful contribution from environmental factors. OBJECTIVE: This study sought to clarify the contribution of genetic factors to EoE through estimation of familial aggregation and risk of EoE in extended relatives. METHODS: The Utah Population Database, a population-based genealogy resource linked to electronic medical records for health care systems across the state of Utah, was used to identify EoE cases and age, sex, and birthplace-matched controls at a 5:1 ratio...
February 10, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28160233/the-intergenerational-transmission-of-low-birth-weight-and-intrauterine-growth-restriction-a-large-cross-generational-cohort-study-in-taiwan
#16
Mengcen Qian, Shin-Yi Chou, Lea Gimenez, Jin-Tan Liu
Objectives Our research provides evidence on the intergenerational fetal programming effect by examining associations in the low birth weight (LBW, birth weight <2500 g) and intrauterine growth restriction (IUGR) status between two adjacent generations from both the maternal and paternal sides. Methods Birth certificate data of the entire Taiwanese population are used to construct three-consecutive-generational samples. The final samples consist of the third-generation children born during 1999-2006 to at least one second-generation (G2) parent born during 1978-1985...
February 3, 2017: Maternal and Child Health Journal
https://www.readbyqxmd.com/read/28148817/pre-copula-acoustic-behaviour-of-males-in-the-malarial-mosquitoes-anopheles-coluzzii-and-anopheles-gambiae-s-s-does-not-contribute-to-reproductive-isolation
#17
Patrício M V Simões, Gabriella Gibson, Ian J Russell
We reveal that males of two members of the Anopheles gambiae s.l. species complex, Anopheles coluzzii and Anopheles gambiae s.s. (hereafter A. gambiae), which are both malaria vectors, perform a stereotypical acoustic behaviour in response to pure tones at frequencies that encompass the frequency range of the female's flight-tones. This behaviour resembles that described for Culex quinquefasciatus and consists of phonotactic flight initiated by a steep increase in wing-beat frequency (WBF) followed by rapid frequency modulation (RFM) of WBF when in close proximity to the sound source...
February 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28141898/a-combination-of-sexual-and-ecological-divergence-contributes-to-rearrangement-spread-during-initial-stages-of-speciation
#18
Genevieve M Kozak, Crista B Wadsworth, Shoshanna C Kahne, Steven M Bogdanowicz, Richard G Harrison, Brad S Coates, Erik B Dopman
Chromosomal rearrangements between sympatric species often contain multiple loci contributing to assortative mating, local adaptation and hybrid sterility. When and how these associations arise during the process of speciation remains a subject of debate. Here, we address the relative roles of local adaptation and assortative mating on the dynamics of rearrangement evolution by studying how a rearrangement covaries with sexual and ecological trait divergence within a species. Previously, a chromosomal rearrangement that suppresses recombination on the Z (sex) chromosome was identified in European corn borer moths (Ostrinia nubilalis)...
April 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28141891/can-mhc-assortative-partner-choice-promote-offspring-diversity-a-new-combination-of-mhc-dependent-behaviours-among-sexes-in-a-highly-successful-invasive-mammal
#19
Pablo S C Santos, Frank-Uwe Michler, Simone Sommer
Sexual selection involving genetically disassortative mate choice is one of several evolutionary processes that can maintain or enhance population genetic variability. Examples of reproductive systems in which choosers (generally females) select mates depending on their major histocompatibility complex (MHC) genes have been reported for several vertebrate species. Notably, the role of MHC-dependent choice not in mating contexts, but in other kinds of social interactions such as in the establishment of complex social systems, has not yet drawn significant scientific interest and is virtually absent from the literature...
April 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28133841/incipient-speciation-driven-by-hypertrophied-lips-in-midas-cichlid-fishes
#20
Gonzalo Machado-Schiaffino, Andreas F Kautt, Julian Torres-Dowdall, Lukas Baumgarten, Frederico Henning, Axel Meyer
Sympatric speciation has been debated in evolutionary biology for decades. Although it has gained in acceptance recently, still only a handful of empirical examples are seen as valid (e.g. crater lake cichlids). In this study, we disentangle the role of hypertrophied lips in the repeated adaptive radiations of Nicaraguan crater lake cichlid fish. We assessed the role of disruptive selection and assortative mating during the early stages of divergence and found a functional trade-off in feeding behaviour between thick- and thin-lipped ecotypes, suggesting that this trait is a target of disruptive selection...
April 2017: Molecular Ecology
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