Consulta: subjectFacets:"Mating system"
Registros recuperados: 15
Data/hora: 09/06/2024 18:23:25

Population genetic structure of Sisyrinchium micranthum Cav. (Iridaceae) in Itapuã State Park, Southern Brazil
Provedor de dados: 74
Autores: Tacuatiá,Luana Olinda; Eggers,Lilian; Kaltchuk-Santos,Eliane; Souza-Chies,Tatiana T.
Sisyrinchium micranthum Cav. is a member of the family Iridaceae, which is distributed over the American continent. In Brazil, this species is found, not only in disturbed areas and coastal regions, but is also very common in urban centers, such as public parks, during the spring. Chromosome counts for North American specimens are 2n = 32 and 2n = 48, whereas in southern Brazil, there is a polyploidy series with three chromosome numbers, 2n = 16, 2n = 32, and 2n = 48. Population analyses using DNA molecular markers are inexistent for this species, in spite of its wide distribution and morphological variation. To study the genetic population structure of S. micranthum, five natural populations were accessed in a conservation park within the Atlantic Rain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iridaceae; ISSR-PCR; Mating system; Population genetics; Sisyrinchium micranthum.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000100014

The genetic structure and mating system of Acrocomia aculeata (Arecaceae)
Provedor de dados: 74
Autores: Abreu,Aluana Gonçalves; Priolli,Regina Helena Geribello; Azevedo-Filho,Joaquim Adelino; Nucci,Stella Maris; Zucchi,Maria Imaculada; Coelho,Ricardo Marques; Colombo,Carlos Augusto.
Acrocomia aculeata is a perennial, fruit-producing palm tree, native to tropical forests. Its fruits have spurred interest because of their significant potential for use in the cosmetic industry and as feedstock for biofuel. In the present study, the genetic structure and mating system in Acrocomia aculeata were analyzed, using eight nuclear microsatellite loci and samples from São Paulo and Minas Gerais states, Brazil. By means of Bayesian analysis, these populations were clustered into two or three groups. A high multilocus outcrossing rate suggests that outcrosses were predominant, although a certain degree of biparental inbreeding also occurred. Thus, although monoecious and self-compatible, there is every indication that A. aculeata bears a mixed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SSR; Mating system.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000100016

High levels of genetic differentiation and selfing in the Brazilian cerrado fruit tree Dipteryx alata Vog. (Fabaceae)
Provedor de dados: 74
Autores: Tarazi,Roberto; Moreno,Maria Andréia; Gandara,Flávio Bertin; Ferraz,Elza Martins; Moraes,Mário Luiz Teixeira; Vinson,Christina Cleo; Ciampi,Ana Yamaguishi; Vencovsky,Roland; Kageyama,Paulo Yoshio.
Dipteryx alata is a native fruit tree species of the cerrado (Brazilian savanna) that has great economic potential because of its multiple uses. Knowledge of how the genetic variability of this species is organized within and among populations would be useful for genetic conservation and breeding programs. We used nine simple sequence repeat (SSR) primers developed for Dipteryx odorata to evaluate the genetic structure of three populations of D. alata located in central Brazil based on a leaf sample analysis from 101 adults. The outcrossing rate was evaluated using 300 open-pollinated offspring from 25 seed-trees. Pollen dispersal was measured by parentage analysis. We used spatial genetic structure (SGS) to test the minimal distance for harvesting seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dipteryx alata; Genetic structure; Mating system; SSR.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100015

Sociogenetic structure of Polistes (Aphanilopterus) versicolor Olivier, 1791 colonies (Hymenoptera, Vespidae, Polistini)
Provedor de dados: 74
Autores: Nagamati Junior,Keize; Simokomaki,Kimie; Gruber,Caroline Vivian; Del Lama,Marco Antonio.
The observation of two distinct, well-defined oviposition areas in nests of the primitively eusocial wasp Polistes versicolor suggests the presence of multiple egg-layers and territorial behaviors. Electrophoretic analysis of enzyme loci in pupae from 35 colonies revealed an average observed heterozygosity of 0.10 and the existence of private polymorphisms, thereby indicating a low dispersion in this species. No evidence of diploid males was found. Phenotypic segregation analysis revealed the presence of more than one egg-laying female in 15 out of 35 colonies, as well as spatially preferential oviposition in 2 out of 13 nests, with distinct oviposition areas. Genetic relatedness estimates for brood were lower than expected for haplodiploid species under...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mating system; Relatedness; Multiple egg layers; Territorial behavior; Paper wasps.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400013

Mating system of a population of Myracrodruon urundeuva F.F. &amp;amp; M.F. Allemão using the fAFLP molecular marker
Provedor de dados: 74
Autores: Freitas,Miguel L.M.; Sebbenn,Alexandre M.; Moraes,Mario L.T.; Lemos,Eliana G.M.
The mating system and genetic diversity were studied in a natural population of Myracrodruon urundeuva originating from 30 open-pollinated trees at the Paulo de Faria Ecological Station, SP, Brazil. The progenies were planted on the Teaching and Research Farm of the Ilha Solteira Engineering School, UNESP. Using the fAFLP molecular marker, eleven loci were selected to study the mating system. The mating system was analyzed using the multilocus mixed-mating model. The estimates of genetic divergence between pollen and ovule allele frequencies were significant for eight loci, suggesting nonrandom outcrossing. The estimates of the multilocus outcrossing rate revealed that M. urundeuva possesses a mating system with a predominance of outcrossing events (theta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myracrodruon urundeuva; Mating system; FAFLP; Molecular marker; Correlation of paternity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300019

Role of evolutionary and ecological factors in the reproductive success and the spatial genetic structure of the temperate gorgonian Paramuricea clavata
Provedor de dados: 5
Autores: Mokhtar-jamai, Kenza; Coma, Rafel; Wang, Jinliang; Zuberer, Frederic; Feral, Jean-pierre; Aurelle, Didier.
Dispersal and mating features strongly influence the evolutionary dynamics and the spatial genetic structure (SGS) of marine populations. For the first time in a marine invertebrate, we examined individual reproductive success, by conducting larval paternity assignments after a natural spawning event, combined with a small-scale SGS analysis within a population of the gorgonian Paramuricea clavata. Thirty four percent of the larvae were sired by male colonies surrounding the brooding female colonies, revealing that the bulk of the mating was accomplished by males from outside the studied area. Male success increased with male height and decreased with increasing male to female distance. The parentage analyses, with a strong level of self-recruitment (25%),...
Tipo: Text
Palavras-chave: Gamete and larval dispersal; Mating system; Microsatellites; Natural spawning event; Parentage analyses.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00372/48281/48502.pdf

The Combined Effect of Haplodiplonty and Partial Clonality on Genotypic and Genetic Diversity in a Finite Mutating Population
Provedor de dados: 5
Autores: Stoeckel, Solenn; Arnaud-haond, Sophie; Krueger-hadfield, Stacy A; Orive, Maria.
Partial clonality is known to affect the genetic composition and evolutionary trajectory of diplontic (single, free-living diploid stage) populations. However, many partially clonal eukaryotes exhibit life cycles in which somatic development occurs in both haploid and diploid individuals (haplodiplontic life cycles). Here, we studied how haplodiplontic life cycles and partial clonality structurally constrain, as immutable parameters, the reshuffling of genetic diversity and its dynamics in populations over generations. We assessed the distribution of common population genetic indices at different proportions of haploids, rates of clonality, mutation rates, and sampling efforts. Our results showed that haplodiplontic life cycles alone in finite populations...
Tipo: Text
Palavras-chave: Mating system; Asexuality; Genetic and genotypic diversity; Life cycle; Linkage disequilibrium; FIS.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00684/79593/82282.pdf

Rare sex or out of reach equilibrium? The dynamics of F-IS in partially clonal organisms
Provedor de dados: 5
Autores: Reichel, Katja; Masson, Jean-pierre; Malrieu, Florent; Arnaud-haond, Sophie; Stoeckel, Solenn.
Background: Partially clonal organisms are very common in nature, yet the influence of partial asexuality on the temporal dynamics of genetic diversity remains poorly understood. Mathematical models accounting for clonality predict deviations only for extremely rare sex and only towards mean inbreeding coefficient (F-IS) over bar &lt; 0. Yet in partially clonal species, both F-IS &lt; 0 and F-IS &gt; 0 are frequently observed also in populations where there is evidence for a significant amount of sexual reproduction. Here, we studied the joint effects of partial clonality, mutation and genetic drift with a state-and-time discrete Markov chain model to describe the dynamics of F-IS over time under increasing rates of clonality. Results: Results of the...
Tipo: Text
Palavras-chave: Partial asexuality; Parthenogenesis; Mating system; Inbreeding coefficient; Heterozygote excess; Genetic diversity.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00344/45474/45019.pdf

Self-pollination and its implication in invasiveness of Helianthus annuus ssp. annuus AND H. Petiolaris
Provedor de dados: 46
Autores: Gutierrez,A; Rueda,F; Cantamutto,M; Poverene,M.
Helianthus petiolaris and H. annuus are exotic invaders that have spread widely in central Argentina in the last 70 years. As other annuals of the same genus, these species are outcrossers bearing a sporophytic self-incompatible mechanism. We investigated the ability to self-pollinate in plants of five accessions of each species, its influence on some reproductive traits, and compared to the cultivated sunflower, in which breeding for self-compatibility has been very successful. Plants were allowed to self-pollinate in bagged heads, manually forced to self-pollinate or allowed to cross-pollinate. Although both invasive species were confirmed as self-incompatible, some plants within most accessions were able to self-pollinate. There was no significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene flow; Mating system; Seed set; Self-compatibility; Sporophytic SI.
Ano: 2014
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332014000300001

Sexual maturation and reproductive activity of spring-born female corn mice, Calomys musculinus, in absence of adults
Provedor de dados: 81
Autores: Sommaro,Lucía; Gomez,Daniela; Steinmann,Andrea; Priotto,José.
The aim of this study was to analyze the effects of parents on maturation and reproductive activity of spring-born females in fenced populations of Calomys musculinus, at the beginning of the breeding period. The field study was carried out in four 0.25-ha enclosures (two control and two experimental), each situated on natural pasture. This study had two periods: 1) Absence of fathers (AF) (from September 2003 to January 2004), and 2) Absence of mothers (AM) (from October 2004 to February 2005). In both periods, in control enclosures both parents remained with the offspring. During AF period, in experimental enclosures only the mothers remained with their offspring. In AM period, only the adult males remained with their offspring in experimental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adult removal; Mating system; Reproductive activity.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832009000200012

Mating systems in caridean shrimp (Decapoda: Caridea) and their evolutionary consequences for sexual dimorphism and reproductive biology
Provedor de dados: 97
Autores: CORREA,CRISTIÁN; THIEL,MARTIN.
In this paper we review functional and evolutionary relationships among mating systems of caridean shrimp and specific traits such as general biology/ecology, sexual systems, behavior and morphology. Four mating systems are described based on reports from available literature, and a fifth system is recognized but published information is insufficient to describe it in detail. `Monogamy' occurs in many species inhabiting monopolizable refuges or hosts, especially when environmental conditions restrict the probability of intraspecific interactions. In contrast, free-living species experience higher encounter rates and males can dominate or search. In `neighborhoods of dominance' mating systems, large males have higher reproductive success since they perform...
Tipo: Journal article
Palavras-chave: Caridea; Mating behavior; Mating system; Sexual dimorphism; Sexual system.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200006

Larvas de Scinax rizibilis (Bokermann) (Anura, Hylidae): avaliando o efeito parental
Provedor de dados: 104
Autores: Bastos,Rogério P.; Haddad,Célio F.B.
A controlled experiment, related with the mating system of Scinax rizibilis (Bokermann, 1964), was conducted to assess if larval variation could be due to size of male or its ability to manage an amplexus. Adult individuals were caught during breeding activity (from February 1993 to January 1994), in a temporary pond in the municipality of Ribeirão Branco. São Paulo State, southeastern Brazil. The duration of the larval period was not different between tadpoles of large and small males, nor was it different between tadpoles coming from natural or artificial pairs. The reproductive status of the male (if it had managed an amplexus) also did not influence the total length nor the mass of the tadpoles close to metamorphosis. However, tadpoles of larger and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scinax rizibilis; Mating system; Larval characteristic.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400012

Outcrossing rate of Couratari multiflora (J.Smith) Eyma (Lecythidaceae), a low-density tropical tree species from a central Amazonian rainforest
Provedor de dados: 36
Autores: Lepsch-Cunha,Nadja; Kageyama,Paulo Yoshio; Vencovsky,Roland; Nascimento,Henrique E. M.
A multilocus mixed-mating model was used to evaluate the mating system of a population of Couratari multiflora, an emergent tree species found in low densities (1 individual/10 ha) in lowland forests of central Amazonia. We surveyed and observed phenologically 41 trees in an area of 400 ha. From these, only four mother trees were analyzed here because few of them set fruits, which also suffered high predation. No difference was observed between the population multilocus outcrossing rate (t mp = 0.953 ± 0.040) and the average single locus rate (t sp = 0.968 ± 0.132). The four mother trees were highly outcrossed (t m ~ 1). Two out of five loci showed departures from the Hardy-Weinberg Equilibrium (HWE) expectations, and the same results occurred with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mating system; Couratari spp.; Genetic conservation; Amazon.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672011000100018

Pollinator availability, mating system and variation in flower morphology in a tropical savanna tree
Provedor de dados: 39
Autores: Rech,André Rodrigo; Jorge,Leonardo Ré; Ollerton,Jeff; Sazima,Marlies.
ABSTRACT Widely distributed organisms face different ecological scenarios throughout their range, which can potentially lead to micro-evolutionary differentiation at specific localities. Mating systems of animal pollinated plants are supposed to evolve in response to the availability of local pollinators, with consequent changes in flower morphology. We tested the relationship among pollination , mating system, and flower morphology over a large spatial scale in Brazilian savannas using the tree Curatella americana (Dilleniaceae). We compared fruit set with and without pollinators in the field, and analyzed pollen tube growth from self- and cross-pollinated flowers in different populations. Populations with higher natural fruit set also had lower fruit set...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado savanna; Mating system; Pollination biogeography; Reproductive assurance; Self-compatibility.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000300462

Limb amputation by male Neotropical longhorn beetles during competition for females
Provedor de dados: 49
Autores: Larsson,Folke Kustvall.
The biology and mating behaviour of the spectacularly large and brightly coloured Neotropical longhorn beetle Schwarzerion holochlorum Bates 1872 (Coleoptera: Cerambycidae) is largely unknown. For the first time I report and photographically document violent male-male competitions for females involving frequent amputations of competitors' legs and antennae.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Amputations; Male-male competition; Palo Verde National Reserve; Costa Rica; Longhorn beetle; Cerambycidae; Mating system.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000100030