The influence of relative plant density and floral morphological complexity on the behaviour of bumblebees

@article{Stout1998TheIO,
  title={The influence of relative plant density and floral morphological complexity on the behaviour of bumblebees},
  author={J C Stout and John A. Allen and D. Goulson},
  journal={Oecologia},
  year={1998},
  volume={117},
  pages={543-550}
}
Abstract We assessed the combined effects of varying the relative density and the relative floral morphological complexity of plant species on the behaviour of their bumblebee pollinators. Three species of bumblebee (Bombus pascuorum, B. terrestris and B. hortorum) were observed foraging on experimental arrays consisting of pair-wise combinations of four plant species: Borago officinalis, Phacelia tanacetifolia (both with simple flowers), Antirrhinum majus and Linaria vulgaris (both with… Expand
Local floral composition and the behaviour of pollinators: attraction to and foraging within experimental patches
TLDR
Investigating how plant identity, the mixtures of these plant species, and total plant density affected the attraction to and the foraging within a patch for six pollinator groups found dense patches were preferred by all insect groups for arrival, although muscoid and hover flies responded less to local floral composition than bees. Expand
INFLUENCE OF PLANT ABUNDANCE ON POLLINATION AND SELECTION ON FLORAL TRAITS OF IPOMOPSIS AGGREGATA
TLDR
The relationships between multiple components of plant abundance and pollination, reproductive success, and phenotypic selection via female fitness on four floral traits in artificial and natural populations of the hummingbird-pollinated Iponlopsis aggregate are examined to suggest that the effect of plant abundances cannot be easily predicted from simple diagnostic traits such as breeding system or spatial scale. Expand
Population dependence in the interactions with neighbors for pollination: A field experiment with Taraxacum officinale.
TLDR
This study shows that a similar local neighborhood can differentially affect the frequency and foraging behavior of pollinators, even in closely situated populations. Expand
Do honeybees promote or reduce the reproduction of two rare plants in Bulgaria
TLDR
It was revealed that honeybees preferred other plants for foraging in the studied communities, and neither promote nor reduce the reproduction of these rare plants. Expand
The effect of density-dependent insect visits, flowering phenology, and plant size on seed set of the endangered vernal pool plant Pogogyne abramsii (Lamiaceae) in natural compared to created vernal pools
TLDR
It is concluded that pollinator limitation should not preclude the sparser populations of smaller plants in the created pools from having a positive growth rate, and establishment and persistence of populations in a majority of created basins on this site confirms this assertion. Expand
The effects of plant density and nectar reward on bee visitation to the endangered orchid Spiranthes romanzoffiana
TLDR
The results suggest that individual S. romanzoffiana inflorescences compete intraspecifically for visitation from pollinators at high densities, suggesting interspecific facilitation of pollinator visitation at high density. Expand
Density and seed set in a self-compatible forb, Penstemon digitalis (Plantaginaceae), with multiple pollinators.
TLDR
The results suggest that economics of flight and maneuverability of large, long-tongued bumblebees lead them to transfer more pollen between than within Penstemon plants in large patches, suggesting these bees may be important pollinators at low plant densities. Expand
CAUSES OF SYNCHRONOUS FLOWERING IN ASTRAGALUS SCAPHOIDES, AN ITEROPAROUS PERENNIAL PLANT
TLDR
It is suggested that different mechanisms drive cv and bimodality in this species, both of which contribute to overall synchrony, which may be at least partly an indirect consequence of individual-level reproductive constraints. Expand
Bumblebees forage on flowers of increasingly complex morphologies despite low success
TLDR
Investigation of how complex flowers are chosen and handled by naive and experienced bumblebees when presented along with simple ones suggests that inexperienced foragers and unsuccessful feeding attempts increasingly contribute to floral pollination along the morphological complexity gradient. Expand
Behavior of queen bumblebee pollinators on Primula sieboldii (Primulaceae) in response to different patch sizes and spacing
TLDR
The result indicates that the bumblebees came close to an ideal free distribution for the use of resources in terms of the patch size within a population, and the plant's point of view, increasing the number, but decreasing the proportion, of flowers visited in larger patches would maximize reproductive success by minimizing inbreeding. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 58 REFERENCES
Resource Partitioning in Bumblebees: Experimental Studies of Foraging Behavior
TLDR
These removal experiments demonstrated that the bumblebees were sampling flowers frequently enough and were flexible enough in the absence of other bumblebee species. Expand
Do Tropical Bird‐Pollinated Plants Exhibit Density‐Dependent Interactions? Field Experiments
TLDR
In a tropical cloud forest at Monteverde, Costa Rica, three understory shrub species overlap greatly in flowering seasons and share hummingbird pollinators, apparently the intensity of density dependence, at least in terms of female reproductive success, varies among plant species sharing pollinators. Expand
Floral display size in comfrey, Symphytum officinale L. (Boraginaceae): relationships with visitation by three bumblebee species and subsequent seed set
TLDR
It is suggested that in this system seed set is not limited by pollination but by other factors, possibly nutritional resources. Expand
Costs to foraging bumble bees of switching plant species
TLDR
Bees foraging on simple flowers showed no tendency towards flower constancy, and switching between species did not increase handling times or handling errors, and foragers displayed strong constancy when visiting more complex flowers. Expand
DIFFERENCES IN THE FLOWERS VISITED BY FOUR SPECIES OF BUMBLE-BEES AND THEIR CAUSES
TLDR
The object of this study was to determine what differences existed in one small area in the feeding plants of the four common species of Bombus present, and the cause of these differences. Expand
Competition for Pollinators between Simultaneously Flowering Species
TLDR
The outcome of interspecific competition was analyzed with a simple two-species model and found that an increase in pollinator constancy to a given plant species retards the elimination of the rarer species. Expand
Population size and density effects in pollination : Pollinator foraging and plant reproductive success in experimental arrays of Brassica kaber
TLDR
Field experiments were performed to test the effects of two components of local abundance on pollination in the self-incompatible annual plant, Brassica kaber, and population density had strong effects on both visitation and reproductive success. Expand
Sex and the single mustard : population density and pollinator behavior effects on seed-set
TLDR
The most dramatic density effects occurred where pollinators were induced to behave as generalists, suggesting that density—related declines in pollinator quality are more important than parallel declines in the quantity of visits. Expand
A Model to Predict the Influence of Insect Flower Constancy on Interspecific Competition between Insect Pollinated Plants
TLDR
A simple two-flower species model is developed which predicts the proportion of insects which will favour each of the two species for particular flower densities, assuming that individual insects favour the species which provides them with the greatest reward per time. Expand
Predicted pollen dispersal by honey-bees and three species of bumble-bees foraging on oil-seed rape : a comparison of three models
TLDR
Overall, the consensus of the models' predictions is that most of the pollen from a source plant is deposited on immediate neighbours, but that long-distance pollen dispersal in this system extends over approximately 20-40 intervening plants from the originating plant, depending on the identity of the pollinator. Expand
...
1
2
3
4
5
...