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Registros recuperados: 19
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A holoparasitic plant severely reduces the vegetative and reproductive performance of its host plant in the Caatinga, a Brazilian seasonally dry forest Acta Botanica
Cruz Neto,Oswaldo; Leal,Inara Roberta; Santos,Jean Carlos; Lopes,Ariadna Valentina.
ABSTRACT Host-parasite interactions between plants may reduce the vegetative and reproductive performance of the host plant. Although it is well established that parasitic plants may negatively affect the metabolism and the number of vegetative/reproductive structures of their hosts, the effects of this interaction on the reproductive characteristics of the host plant are poorly understood. Here we document the interaction between Cuscuta partita (Convolvulaceae) and its main host, Zornia diphylla (Fabaceae), in the Caatinga of northeastern Brazil. We measured diverse reproductive/vegetative attributes of Z. diphylla in 60 plots randomly distributed in patches that were parasitized and not parasitized by C. partita. Both vegetative and reproductive...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Caatinga; Cuscuta partita; Floral traits; Haustoria; Holoparasitic plants; Plant-plant interaction; Pollen viability; Reproductive success; Zornia diphylla.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100147
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Can the reproductive system of a rare and narrowly endemic plant species explain its high genetic diversity? Acta Botanica
Rodrigues,Daniele M.; Turchetto,Caroline; Callegari-Jacques,Sidia M.; Freitas,Loreta B..
ABSTRACT The reproductive system of flowering plants can be highly variable, affecting their biology, gene flow and genetic variability among populations. Petunia secreta is a rare annual endemic species of Pedra do Segredo, located in the municipality of Caçapava do Sul, state of Rio Grande do Sul, Brazil. Although rare, the species possesses a high level of genetic variability. We investigated the reproductive system of P. secreta, including fruit production and seed germinability, in order to determine if its reproductive system can explain its genetic diversity. We sampled five populations and conducted five greenhouse hand-pollination treatments: 1) autonomous apomixis; 2) self-pollination; 3) hand self-pollination; 4) geitonogamy; and 5)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Endogamy; Pampas; Petunia; Reproductive success; Reproductive system; Seed germinability.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200180
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Diurnal versus nocturnal pollination success in Billbergia horrida Regel (Bromeliaceae) and the first record of chiropterophily for the genus Anais da ABC (AABC)
MARQUES,JUÇARA S.; TAGLIATI,MARCELA C.; FARIA,ANA PAULA G..
Billbergia horrida is endemic of the Atlantic Forest fragments in southeastern Brazil and characterized by flowers with typical traits for pollination by nocturnal animals. Although the majority of Billbergia species rely on diurnal pollination by hummingbirds, B. horrida is also visited by bats and this study evidences for the first time the occurrence of chiropterophily within the genus. The role of different groups of pollinators on the reproductive success of B. horrida was evaluated, as well as the correlation of nectar features in sustaining these animals during different periods of the day. Bats contributed to 82.1% of fruit set of B. horrida. Hummingbirds, in turn, contributed to only 10% of fruit set, and were poorly related to the reproductive...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazilian Atlantic Forest; Floral biology; Hummingbirds pollination; Reproductive success.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200835
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Effect of host availability and egg load in Trichogramma platneri Nagarkatti (Hymenoptera: Trichogrammatidae) and its consequences on progeny quality BABT
Hohmann,Celso L.; Luck,Robert F..
Experiments were conducted to determine whether Trichogramma platneri Nagarkatti manifested a somatic-gametic trade-off and whether it was affected by host availability and host size. Large wasps produced on Trichoplusia ni Hübner and limited to five or 15 T. ni eggs daily, produced a similar number of progeny as wasps offered hosts from emergence. Similar results were obtained when they were deprived of T. ni eggs for one, three, five, or ten days and then provided with unlimited hosts daily until death. In contrast, small wasps produced from Sitotroga cerealella (Olivier) and deprived of T. ni eggs for one to three days suffered a significant reduction in progeny production. Regardless of size, the egg load of non-ovipositing wasps increased...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological control; Somatic-gametic trade-off; Reproductive success.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300012
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Effect of nectar pillaging by native stingless bees (Hymenoptera: Apidae) in the abscission of flowers of Bougainvillea spectabilis Willd. (Nyctaginaceae) - doi: 10.4025/actascibiolsci.v33i4.8191 Biological Sciences
Aranda, Rodrigo; UFMS; Catian, Gisele; Universidade Federal de Mato Grosso do Sul; Bogiani, Paulo Alexandre; Universidade Federal de Mato Grosso do Sul; Inforzato, Igor; Universidade Federal de Mato Grosso do Sul.
This study had as objective to evaluate whether the pillaging activity by native bees influences floral abscission. Samples were collected in ten individuals of Bougainvillea spectabilis. In the period between May 4 and June 1st, 2009, 2,874 flowers were collected on the ground and 2,895 from the plants, with three-day intervals between each collection and a total of 10 repetitions in each plant. We measured the total of closed flowers, open flowers, robbed flowers, normal flowers, open robbed flowers and non-robber open flowers, in both soil and plant. For the statistical analysis, the T-test was used to see whether there was a difference between the averages obtained from the evaluated characteristics between the soil flowers and plant flowers. Simple...
Palavras-chave: 2.05.00.00-9 insect-plant interaction; Floral damage; Neotropical bees; Reproductive success; Ornamental plant Ecologia insect-plant interaction; Floral damage; Neotropical bees; Reproductive success; Ornamental plant.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8191
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Effect of Wolbachia on the Survival and Reproduction of Trichogramma kaykai Pinto & Stouthamer (Hymenoptera: Trichogrammatidae) Neotropical Entomology
HOHMANN,CELSO L.; LUCK,ROBERT F.; STOUTHAMER,RICHARD.
Parthenogenetic inducing Wolbachia infections are particularly common in the genus Trichogramma, but the influence of the microrganism on parasitoids' fitness has received relatively little attention. The aim of this study was to determine the effects of the bacteria on the survival and reproduction of Trichogramma kaykai Pinto & Stouthamer, comparing an infected line (thelytokous) with an antibiotically cured (arrhenotokous) line, both reared on Trichoplusia ni Hübner eggs. Cured wasps produced significantly more progeny and more daughters than Wolbachia-infected wasps. Significantly more wasps emerged per host when parasitized by the arrhenotokous females than by the thelytokous females. Cured females, however, lived significantly less than...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Insecta; Egg parasitoid; Parthenogenetic induced bacteria; Reproductive success.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2001000400015
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Effects of the parasitism of Struthanthus flexicaulis (Mart.) Mart. (Loranthaceae) on the fitness of Mimosa calodendron Mart. (Fabaceae), an endemic shrub from rupestrian fields over ironstone outcrops, Minas Gerais State, Brazil Acta Botanica
Mourão,Fabiana Alves; Jacobi,Claudia Maria; Figueira,José Eugênio Côrtes; Batista,Eugênia Kelly Luciano.
Parasitic plants (mistletoes) may alter the growth, reproduction and physiology of their hosts. Mimosa calodendron (Fabaceae) is a legume abundant in rupestrian fields on ironstone outcrops, frequently attacked by the hemiparasite Struthanthus flexicaulis (Loranthaceae). The objective of this study was to evaluate the consequences of parasitism by S. flexicaulis on the fitness of M. calodendron. The intensity of parasitism and mortality on hosts of different sizes was evaluated, and foliage cover, fruit and seed set in parasitized and non-parasitized individuals were compared. More than 65% of a population of 1820 individuals was attacked. Host density positively influenced parasitism. The mortality and number of attacked hosts increased with their crown...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ironstone; Mimosa; Parasitism; Reproductive success; Struthanthus.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000300023
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Fruit set of distylous Psychotria carthagenensis Jacq. (Rubiaceae) mediated by Apis mellifera (Apidae) and species of Augochloropsis (Halictidae) Acta Botanica
Faria,Rogério Rodrigues; Araujo,Andréa Cardoso.
Heterostyly is a floral polymorphism consisting in the presence of two morphs in the population that differ reciprocally in the position of their sexual organs. Heterostylous species depend on visitors to produce fruits, but the efficiency of insect species as pollinators greatly varies and depends on the morph visited. The aim of the present study was to determine the effect of a single visit by the bees Apis mellifera and species of Augochloropsis on the fruit set of the distylous species Psychotria carthagenensis.After a single visit from each bee species, flowers were bagged to monitor the fruit set. Pollination effectiveness between pollinators and morphs was compared. The results of the experiments were compared with data from manual intermorph...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Bee pollination; Heterostyly; Honeybees; Pollination effectiveness; Reproductive success.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200278
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Phenological patterns and reproductive success of Ceiba pentandra (Bombacaceae) in tropical dry and wet forests of Costa Rica RChHN
ROJAS-SANDOVAL,JULISSA; LOBO,JORGE A; QUESADA,MAURICIO.
We studied the phenological patterns and the reproductive success of 103 Ceiba pentandra trees, located in the tropical dry and wet forests of the Pacific coast of Costa Rica. To determine the phenological patterns of this species we recorded leaf fall, flower and fruit production of marked trees every two-weeks from December through March over three years (2001, 2002 and 2003). We also recorded the flowering and fruiting frequencies for two more years (2000 and 2004). Our data suggest that phenological patterns of C. pentandra trees behave as irregular cycles rather than cycles fixed at supra-annual intervals, and the forest type in which the trees are located does not have a decisive effect on either the probability or the frequency of the reproductive...
Tipo: Journal article Palavras-chave: Ceiba pentandra; Costa Rica; Reproductive success; Supra-annual phenology.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400001
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Polyandrous behavior in Cerconota anonella Sepp (Lepidoptera: Oecophoridae) Neotropical Entomology
Fonseca,Marcy G.; Sousa-Souto,Leandro; Lima,Eraldo R..
Among insects polyandrous behavior is common and plays an important role in female reproductive output. The present study aimed to evaluate the mating frequency of the moth Cerconota anonella Sepp under laboratory conditions and to verify if polyandrous behavior is common in this species. Approximately 47% of females mated more than once. However they presented differences in the mating period (early or late). In general, precocious females were more frequent than late females (P < 0.001, Binomial test). Such results suggest that polyandry in C. anonella may be common in the field.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Spermatophore; Annona muricata; Mating frequency; Reproductive success.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000200021
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Reproductive biology of Bowdichia virgilioides Kunth (Fabaceae) - doi: 10.4025/actascibiolsci.v33i4.9003 Biological Sciences
Silva, Andre Luiz Gomes da; Universidade Federal do Maranhão; Chaves, Samyra Ramos; Universidade Federal do Maranhão; Brito, Jéfferson Mesquita; Universidade Federal do Maranhão.
The aim of this study was to investigate the reproductive biology of Bowdichia virgilioides in an area of Cerrado (Brazilian Savanna). The study was carried out in Chapadinha, State of Maranhão in northeastern Brazil. Bowdichia virgilioides has cornucopia flowering and annual pattern. Flowering occurred at the beginning of the dry season, between June and August; and fruiting in the middle of this season, between July and October. The anthesis of B. virgilioides is diurnal, and the main flower resource is the nectar. During the flower opening, the anthers becomes dehiscent and thus pollen grains are deposited at the stigma, promoting automatic self-pollination. The species is self-compatible and apomitic. In the study area, they were visited by nine...
Tipo: Fenologia e reprodução Palavras-chave: Botânica - Biologia reprodutiva breeding system; Cerrado; Pollination; Reproductive success Botânica breeding system; Cerrado; Pollination; Reproductive success.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/9003
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Reproductive biology of Cabot's Terns on Cardos Island, Santa Catarina, Brazil Biota Neotropica
Fracasso,Hélio Augusto Alves; Branco,Joaquim Olinto; Barbieri,Edison.
Cabot's Terns Thalasseus acuflavidus (Latham, 1737) are widely distributed along the Atlantic coast of South America from the Caribbean Islands (12º S) to the region of Porto Deseado, Argentina (46º S). Daily observations were conducted on the Cardos Island during 2003, 2005 and 2006 to determine timing and nesting success, and the reproductive biology of the Cabot's Terns nesting there. The first adults arrived at the colony from 22 April to 15 May during the three years recorded; a total of 144 nests were recorded in 2003, 174 in 2005 and 50 in 2006. Observed incubation time was 24.1 ± 0.35 days, and mean egg size was 5.15 ± 0.02 cm in length and 34.30 ± 0.25 g in weight. Hatching success was lowest in 2003 and highest in 2006, with natural causes (such...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding; Cabot's Terns; Brazil; Conservation; Reproductive success.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000300005
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Reproductive biology of Synallaxis albescens (Aves: Furnariidae) in the cerrado of central Brazil Biota Neotropica
Marini,Miguel Ângelo; Rodrigues,Sheila Silva; Silveira,Mariana Batista; Greeney,Harold Francis.
Understanding the causes and consequences of variation in reproductive strategies is a central theme in studies of avian life history evolution. This study describes the reproductive biology of Synallaxis albescens (Furnariidae) in the cerrado biome of central Brazil. We monitored 35 nests during the 2003 to 2011 breeding seasons, visiting them every 2-4 days. Synallaxis albescens breeds from mid-September to mid-January, builds a retort-shaped nest, and generally lays three immaculate white eggs. Eggs weighed 1.75 g and measured 19.7 by 14.4 mm. Most nests studied were in open cerrado or shrub grassland at an average height above the ground of 0.3 m, with a preference for Davilla elliptica (Dilleniaceae) shrubs as a nesting substrate. Incubation period...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nests; Eggs; Reproduction; Reproductive success.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000400029
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Reproductive biology of the critically endangered endemic Mediterranean plant Coincya rupestris subsp. rupestris (Spain): the effects of competition and summer drought on seedling establishment RChHN
COPETE,MIGUEL A; HERRANZ,JOSÉ M; FERRANDIS,PABLO.
Flower, fruit, seed production, and flowering phenology (duration, intensity, moment and synchrony) were studied in the two main populations (south east Spain) of the critically endangered endemic Mediterranean plant Coincya rupestris subsp. rupestris (Cruciferae). Production of flowers and fruits (mean ± SD) ranged from 483 (± 688) to 748 (± 636), and from 317 (± 518) to 553 (± 500), respectively, between populations. In addition, the average seed production per plant was 1,607-2,798, thus concluding that fertility was not responsible for the rarity of this taxon. The fruit/flower ratio ranged from 0.60 to 0.75, showing significant inter-population differences. Flowering extended from February-March to the end of spring, with high synchrony (= 85 %). This...
Tipo: Journal article Palavras-chave: Iberian endemism; Flowering phenology; Reproductive success; Seedling recruitment.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300004
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Reproductive strategies of a population of a freshwater amphipod (Crustacea, Amhipoda, Hyalellidae) from southern Brazil Biota Neotropica
Castiglioni,Daniela da Silva; Streck,Morgana Taís; Rodrigues,Stella Gomes; Bueno,Alessandra Angélica de Padua.
Abstract: The aim of this study was to characterize the reproductive strategies of a population of Hyalella bonariensis from southern Brazil. Pairing success, reproductive period of males and females, fecundity, and body size at the onset of reproduction were evaluated. Animals were sampled four times (August 2012, October 2012, January 2013, and April 2013) with the 250 µm-mesh dip net during 20 minutes by only one person. In the field, precopulatory pairs and ovigerous females were individualized. In the laboratory, cephalothorax length (CL) were measured and eggs and juveniles were removed from the females' marsupium and counted. The mean CL of paired males and females was significantly higher than that of non-paired males and females. A sexual...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fecundity; Body size; Hyalella bonariensis; Reproductive success; Pairing success.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000200207
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Reproductive success of four species of Eugenia L. (Myrtaceae) Acta Botanica
Silva,André Luiz Gomes da; Pinheiro,Maria Célia Bezerra.
Eugenia uniflora,E. punicifolia,E. neonitida and E. rotundifolia are perennial species, usually shrubs, which occur in the restinga of the Grumari Natural Municipal Park, in western Rio de Janeiro, Brazil. They have Papaver-type pollen-flowers that are hermaphrodite, polystemonous and pollinated mainly by bees. An assessment of the breeding systems showed that only E. uniflora and E. punicifolia are self-compatible. The fruit/flower, seed/ovule and seed/fruit ratios were calculated for each species. Fruit and seed predators were identified and predation rates were estimated. Total reproductive success for each species in the restinga was extremely low. In order to have one viable seed free from herbivore attack at the end of the reproductive process, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding system; Eugenia; Myrtaceae; Reproductive success; Seed herbivory.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000200024
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Reproductive success of South American terns (Sterna hirundinacea) from Cardos Islands, Florianópolis, SC, Brazil Anais da ABC (AABC)
Fracasso,Hélio A.A.; Branco,Joaquim O..
Sterna hirundinacea (Lesson, 1831) is a migratory seabird that breeds in the Pacific Coast (from Peru to Chile) and along the Atlantic coast of South America from Espírito Santo (Brazil) to Terra del Fuego (Argentina). This paper describes the reproductive success of South American Terns on Cardos Island, Florianopolis, Brazil in the breeding seasons of 2003, 2005 and 2006. The colony was formed in mid-May in 2003 and early April in other years, with the total number of nests ranging from 1,852 in 2006 to 2,486 in 2005. Hatching success was estimated at 76.39% in 2006, 62.73% in 2003 and 41.1% in 2005, the lowest value that could be attributed to predation by hawks Caracara plancus, lizards Tupinambis merianae and black vulture Coragyps atratus. The chicks...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding; Reproductive success; South American Terns; Brazil.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200021
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Reproductive success of Trypoxylon (Trypargilum) lactitarse (Hymenoptera: Crabronidae) in a fragmented landscape Iheringia, Sér. Zool.
Oliveira,Grayce Kelly Costa; Elias,Marcos Antonio da Silva; Bergamini,Leonardo Lima; Franceschinelli,Edivani Villaron.
ABSTRACT Fragmentation of natural vegetation often implies a reduction in local species richness and abundance. The resources used by bees and wasps for feeding and nesting are distributed quite irregularly in fragmented environments, which influences their foraging behavior, occurrence patterns and reproductive success. The objective of the present work was to determine if the size of native vegetation remnants influences the reproductive success of the solitary wasp species Trypoxylon (Trypargilum) lactitarse Saussure, 1867. Trap-nests were established along the edges of forest fragments of different sizes located in municipalities in the central region of the state of Goiás, Brazil. The nests were used to quantify nesting rate, number of cells with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fragmentation; Reproductive success; Trap-nests.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100204
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Sperm depletion: a cost for single mated females of Podisus nigrispinus (Dallas, 1851) (Heteroptera: Pentatomidae) BABT
Sousa-Souto,Leandro; Evangelista Júnior,Walter Santos; Lima,Eraldo Rodrigues; Zanuncio,José Cola; Fonseca,Marcy das Graças.
The aim of this work was to test if egg viability of polyandrous females was increased with increasing number of matings. Longevity and reproductive output of females of the predatory stinkbug Podisus nigrispinus that were allowed to mate for 0, 1, 2, 3 times or were in the continuous presence of the same male was evaluated. Polyandry resulted in diminished sperm depletion. Females that had mated three times or that were in continuous presence of a male produced more offspring than females that mated once or twice throughout their lifetime. There was a negative correlation of mating history on female longevity. Results indicated that remating, either with same male or with different males were crucial for maximization of the reproductive success of females.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Asopinae; Multiple matings; Reproductive success; Biological control; Mate choice.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700009
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