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| Registros recuperados: 15 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 15 | |
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