Consulta: creatorFacets:"Varassin,Isabela Galarda"
Registros recuperados: 7
Data/hora: 16/06/2024 06:29:02

Pollinator guild organization and its consequences for reproduction in three synchronopatric species of Tibouchina (Melastomataceae)
Provedor de dados: 92
Autores: Franco,Ana Maria; Goldenberg,Renato; Varassin,Isabela Galarda.
Pollinator guild organization and its consequences for reproduction in three synchronopatric species of Tibouchina (Melastomataceae). In co-flowering plant species, pollinator sharing can result in interspecific pollen transfer and fecundity reduction. Competition will be relaxed whenever there is a large amount of initial pollen supply or if each plant species occupies different habitat patches. Reproduction in Tibouchina cerastifolia (Naudin) Cogn., T. clinopodifolia (DC.) Cogn. and T. gracilis (Bonpl.) Cogn. was studied in an area of Atlantic rainforest to examine whether synchronopatry induces time partitioning among pollinator species. Eleven bee species comprised the pollinator guild. Among pollinators, there were overlaps in bee species composition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bees; Breeding systems; Pollination; Time partitioning.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262011000300011

Produção de néctar e visitas por abelhas em duas espécies cultivadas de Passiflora L. (Passifloraceae)
Provedor de dados: 39
Autores: Varassin,Isabela Galarda; Ximenes,Brunna Maria Setti; Moreira,Priscila Ambrósio; Zanon,Mireille Maria Franco; Elbl,Paula; Löwenberg-Neto,Peter; Melo,Gabriel Augusto Rodrigues.
A atividade dos polinizadores é afetada pela disponibilidade de recursos. Flores que produzem mais néctar podem ser mais visitadas e assim apresentar maior produção de frutos. O efeito da produção de néctar na atividade dos polinizadores foi testado em duas espécies cultivadas de maracujá, Passiflora alata Curtis e Passiflora edulis Sims, em Morretes, Paraná. Botões foram ensacados e o néctar acumulado das flores foi coletado em intervalos de 1 h. Em P. alata o volume e a concentração de solutos no néctar aumentaram durante o período de antese, associados com o aumento da temperatura. Em P. edulis, o volume aumentou durante o período diurno da antese, e decresceu após as 18 horas. A concentração de solutos no néctar permaneceu constante. A taxa média de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bombus morio; Passiflora alata; Passiflora edulis; Polinização; Xylocopa frontalis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000100024

Reproductive biology and pollination of Aechmea distichantha Lem. (Bromeliaceae)
Provedor de dados: 39
Autores: Scrok,Gilson João; Varassin,Isabela Galarda.
Reproductive biology, including phenology, flower biology, pollination, and the reproductive system in the bromeliad Aechmea distichantha were studied in an Araucaria forest in the state of Paraná. Phenology and reproduction in terricolous plants were followed in October 2006 and May - October of 2007. Flowering peaked from June to September and fruiting was from June to October. Flower anthesis lasted one day. Flowers were pollinated the most by the hummingbird Stephanoxis lalandi and the most common butterfly visitor was Lychnuchoides ozias ozias. Nectar concentration declined during anthesis, while nectar volume was constant. Aechmea distichantha is self-compatible with 30-45% fruit formation in self-pollination tests. Sunlight influences reproduction:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding systems; Floral phenology; Floral biology; Hummingbirds; Butterflies.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000300009

Effect of rosette size, clonality and spatial distribution on the reproduction of  Vriesea carinata (Bromeliaceae) in the Atlantic Forest of Paraná, southern Brazil
Provedor de dados: 39
Autores: Silva,Marcelo Aparecido de Souza; Varassin,Isabela Galarda.
ABSTRACT Plant size and clonality are important traits for explaining the reproductive effort of clonal plants. Larger plants can invest more resources into reproduction, and clonality is known to increase reproductive effort. Moreover, reproductive effort is influenced by environmental variation, and so the spatial distribution of plants may affect plant reproductive effort. We investigated the effect of plant size, clonality and spatial distribution on the reproductive effort of Vriesea carinata in the Atlantic Forest in the state of Paraná, Brazil. We marked twenty individual plants and measured their rosette size, biomass and number, as well as rosette reproductive effort (number of flowers, fruits and seeds). We also evaluated the relationship between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clonal growth; Morphological variation; Reproductive effort; RNSM; Vriesea.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300401

Ecological factors affecting the fruiting success of a Tibouchina trichopoda (DC.) Baill. (Melastomataceae) flower
Provedor de dados: 39
Autores: Maia,Fabiano Rodrigo da; Malucelli,Tiago Simões; Varassin,Isabela Galarda.
The abundance and distribution of resources for pollinators modulate the reproduction of plants. This study attempted to determine whether and how the fruiting success of Tibouchina trichopoda flowers varies due to plant size, number of flowers produced, distance between individuals and cardinal orientation of the flowers. From July 2009 to February 2010, we conducted monthly evaluations of 21 plants in an area of regenerating forest within the Atlantic Forest biome, located near the municipality of Antonina, in southern Brazil. Floral density was monitored weekly. During the study period, the species bloomed twice: once during the cool, dry season, showing an extended flowering period with scattered flowering individuals; and once during the hot, rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resource allocation; Atlantic Rainforest; Plant-pollinator interactions; Population density; Floral longevity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100014

Nectar dynamics and reproductive biology of Passiflora actinia Hook. (Passifloraceae) in Araucaria Forest
Provedor de dados: 39
Autores: Varassin,Isabela Galarda; Baggio,Ana Carolina; Guimarães,Paulo César; Prazeres,Luiz Carlos; Cervi,Armando Carlos; Bueno,Raquel de Oliveira.
ABSTRACT Nectar production has an important role in pollinator attraction and successful fruit production in many self-incompatible angiosperm groups. The reproductive biology of Passiflora actinia was studied here and related to nectar dynamics. Passiflora actinia presented a temporal segregation of male and female functions at the beginning of anthesis. Due to the movements of floral verticils, the anthers were positioned in a way that favors pollination two hours before the stigmas reached the same position. The nectary consisted of an epidermis with stomata and a parenchyma rich in starch, which was hydrolyzed during anthesis. The nectary organization is probably associated with the continuous production of nectar during anthesis as well as with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bees; Nectar; Nectary; Pollination; Xylocopa.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000300426

Breeding system and pollination of Pleroma trichopodum DC. (Melastomataceae): a potential species for the restoration of Atlantic Forest in southern Brazil
Provedor de dados: 39
Autores: Malucelli,Tiago Simões; Maia,Fabiano Rodrigo; Varassin,Isabela Galarda.
ABSTRACT Plant-pollinator interactions and their reproductive implications are of central importance to the organization of plant populations and communities in restoration areas. We studied the breeding system and flower visitors of Pleroma trichopodum, a pioneer species of the Atlantic Forest. We attempted to answer three questions: (1) Is P. trichopodum dependent on pollinators and mates for reproduction? (2) What are the pollinators of P. trichopodum? (3) Do tree flower-density and flowering-tree density of P. trichopodum enhance the visitation rate of focal trees and their flowers? We tested the breeding system through pollination treatments. We performed focal observations on 10 trees and analyzed the relationship between tree and flower visitation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Breeding system; Floral density; Pioneer; Plant-pollinator interactions; Pleroma trichopodum; Restoration; Selfing.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000300402