Effects of variation in inflorescence size and floral rewards on the visitation rates of traplining pollinators ofAralia hispida

1988 ◽  
Vol 2 (1) ◽  
pp. 65-76 ◽  
Author(s):  
James D. Thomson
Keyword(s):  
Inflorescence Size ◽  
Visitation Rates ◽  
Floral Rewards

Flower-visitors, nectar production, and inflorescence size of Asclepias syriaca

1979 ◽  
Vol 57 (12) ◽  
pp. 1380-1388 ◽  
Author(s):  
M. F. Willson ◽  
R. I. Bertin
Keyword(s):  
Honey Bees ◽  
Native Species ◽  
Flowering Phenology ◽  
Spatial And Temporal Variation ◽  
Floral Display ◽  
Asclepias Syriaca ◽  
Nectar Production ◽  
Inflorescence Size ◽  
Visitation Rates ◽  
The Common

Spatial and temporal variation in insect visitation rates are analyzed with respect to nectar production and inflorescence size of Asclepias syriaca L., the common milkweed. Nectar sugar production peaked in the afternoon and evening but this trend was not paralleled by visitations of native insects (either vectors or thieves). The main pollinia vectors were noctuid moths at night and honey bees (Apis mellifera) in the afternoon. Vector visitation rates were highest at the beginning (native species) or middle (total vectors) of the blooming season, declining markedly toward the end, probably as a result of decreasing frequencies of A. syriaca flowers. Large inflorescences attracted more vectors and more thieves and a higher proportion of all visits were made by vectors but the species composition of visitors did not usually change with inflorescence size. We discuss the possibility that honey bees may provide major 'new' selection pressures on floral display, nectar production patterns, and flowering phenology in the common milkweed.

Pollination ecology of Monstera obliqua (Araceae) in French Guiana

2007 ◽  
Vol 23 (5) ◽  
pp. 607-610 ◽  
Author(s):  
Mathieu Chouteau ◽  
Melanie McClure ◽  
Marc Gibernau
Keyword(s):  
French Guiana ◽  
Pollination Ecology ◽  
Lower Portion ◽  
Floral Rewards ◽  
Pollination Mechanisms ◽  
Unisexual Flowers ◽  
Male Flowers ◽  
Female Flowers

Data on pollination ecology of Araceae are still scarce and most concern species belonging to the subfamily Aroideae (García-Robledo et al. 2004, Gibernau 2003, Ivancic et al. 2004, 2005; Maia & Schlindwein 2006). In this subfamily, inflorescences consist of unisexual flowers: female flowers are located in the lower portion and the male flowers are in the upper portion of the inflorescence (Mayo et al. 1997). In the documented neotropical Aroideae, pollinators are nocturnal beetles and pollination mechanisms take place within a floral chamber during a short flowering cycle (generally 24–48 h) with floral rewards (sterile flowers rich in proteins and/or lipids) for the beetle pollinators, the secretion of resin to secure pollen on the pollinator, and the production of heat and odours (Chouteau et al. 2007, García-Robledo et al. 2004, Gibernau & Barabé 2002, Gibernau et al. 1999, 2000, 2003; Maia & Schlindwein 2006, Young 1986).

Changes in the behaviour ofOcypode quadrata(Fabricius, 1787) after experimental trampling

2018 ◽  
Vol 99 (5) ◽  
pp. 1135-1140 ◽  
Author(s):  
Leonardo Lopes Costa ◽  
Julyana Figueiredo Madureira ◽  
Ilana Rosental Zalmon
Keyword(s):  
Surface Activity ◽  
Sampling Design ◽  
Lower Surface ◽  
Sandy Beaches ◽  
Controlled Experiment ◽  
Visitation Rates ◽  
Ghost Crabs ◽  
Before And After

AbstractThe effects of trampling are usually confounded by the diffuse impacts of the urbanization of sandy beaches. We performed a controlled experiment on a beach with low visitation rates to test the hypothesis that ghost crabs avoid building their burrows on impacted plots as a result of the compacted sediment, and they migrate to non-trampled areas. The sampling design encompassed 11 survey quadrats (6 × 6 m) above the strandline, including five trampled plots (100, 300, 900, 1500 and 3000 steps) and six non-trampled plots. The plots were sampled before and after 24, 48 and 72 h of experimental trampling. We found that the ghost crabs avoided building their burrows in only the 1500× and 3000× trampled plots after 24 h, but the avoidance was not related to sediment compactness. Additionally, the emersion time and escape distance from humans were significantly delayed in the most trampled plots, suggesting a lower surface activity and an avoidance of irregular (i.e. high micro-relief) sediment surfaces by ghost crabs, which might reduce their ability to perceive potential predators.

scholarly journals Do abundance and proximity of the alien Impatiens glandulifera affect pollination and reproductive success of two sympatric co-flowering native species?

2012 ◽  
Vol 10 ◽  
pp. 130-139
Author(s):  
Valérie Cawoy ◽  
Mathieu Jonard ◽  
Carolin Mayer ◽  
Anne-Laure Jacquemart
Keyword(s):  
Reproductive Success ◽  
Native Species ◽  
Natural Populations ◽  
Pollen Deposition ◽  
Impatiens Glandulifera ◽  
Insect Behaviour ◽  
Native Flora ◽  
Visitation Rates ◽  
Aconitum Napellus ◽  
Negative Effect

In invasion ecology, potential impacts of aliens on native flora are still under debate. Our aim was to determine the pollinator mediated effects of both proximity and abundance of an alien species on the reproductive success of natives. We chose the highly invasive Impatiens glandulifera and two native species: Epilobium angustifolium and Aconitum napellus ssp. lusitanicum. These species share characteristics allowing for pollination interactions: similar biotopes, overlapping flowering periods and same main pollinators. The effects of abundance (5, 25 and 100 individuals) and proximity (0 and 15 m) of the alien on visitation rate, insect behaviour, pollen deposition and reproductive success of both natives were investigated during 2 flowering seasons. We used centred visitation rates as they can be directly interpreted as a positive or negative effect of the invasive.Both abundance and proximity of the alien increased bumblebee visitation rates to both natives. On the other hand, abundance of the exotic species had a slight negative effect on honeybee visits to natives while its proximity had no effect. The behaviour of bumblebees changed as visitors left significantly more often the native plants for I. glandulifera when its abundance increased. As a consequence of this “inconstancy”, bees deposited considerable quantities of alien pollen on native stigmas. Nevertheless, this interspecific pollen transfer did not decrease seed set in natives. Self-compatibility and high attractiveness of both native species probably alleviate the risk of altered pollinator services and reproductive success due to the invader in natural populations.

Floral rewards in the tribe Sisyrinchieae (Iridaceae): oil as an alternative to pollen and nectar?

2012 ◽  
Vol 25 (4) ◽  
pp. 267-279 ◽  
Author(s):  
Adriano Silvério ◽  
Sophie Nadot ◽  
Tatiana T. Souza-Chies ◽  
Olivier Chauveau
Keyword(s):  
Floral Rewards

Variation in inflorescence size in a dioecious fig tree and its consequences for the plant and its pollinator fig wasp

2013 ◽  
Vol 299 (5) ◽  
pp. 927-934 ◽  
Author(s):  
Nazia Suleman ◽  
Rupert J. Quinnell ◽  
Stephen G. Compton
Keyword(s):  
Fig Wasp ◽  
Inflorescence Size ◽  
Fig Tree
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