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

  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 Dave Goulson},
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… 
Local floral composition and the behaviour of pollinators: attraction to and foraging within experimental patches
  • Ø. Rj
  • Environmental Science
  • 2010
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.
Population dependence in the interactions with neighbors for pollination: A field experiment with Taraxacum officinale.
This study shows that a similar local neighborhood can differentially affect the frequency and foraging behavior of pollinators, even in closely situated populations.
Do honeybees promote or reduce the reproduction of two rare plants in Bulgaria
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.
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
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.
Density and seed set in a self-compatible forb, Penstemon digitalis (Plantaginaceae), with multiple pollinators.
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.
Behavior of queen bumblebee pollinators on Primula sieboldii (Primulaceae) in response to different patch sizes and spacing
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.
Density-Dependent Pollination and Germination in the Patchy Vernal Pool Species Lasthenia californica
Although pollen deposition appears to increase in dense patches, as neighborhood density around the focal patch increases, pollen deposition rates decline, which indicates a lower pollinator visitation rate, implying that increasing flower density can have negative consequences for pollination services.
Height differences in clonal stands of Tussilago farfara promote outcrossing by influencing pollinator behaviour
Plants with mixed mating systems balance the advantages of selfing and the costs of inbreeding. Previous studies have shown that plant species with the ability to self-pollinate and cross pollinate


Resource Partitioning in Bumblebees: Experimental Studies of Foraging Behavior
These removal experiments demonstrated that the bumblebees were sampling flowers frequently enough and were flexible enough in the absence of other bumblebee species.
Do Tropical Bird‐Pollinated Plants Exhibit Density‐Dependent Interactions? Field Experiments
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.
Floral display size in comfrey, Symphytum officinale L. (Boraginaceae): relationships with visitation by three bumblebee species and subsequent seed set
It is suggested that in this system seed set is not limited by pollination but by other factors, possibly nutritional resources.
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.
Competition for Pollinators between Simultaneously Flowering Species
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.
A Model to Predict the Influence of Insect Flower Constancy on Interspecific Competition between Insect Pollinated Plants
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.
Predicted pollen dispersal by honey-bees and three species of bumble-bees foraging on oil-seed rape : a comparison of three models
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.
The flower-visiting behaviour of bumble bees: floral complexity and learning.
The initial probing response of inexperienced bumble bees is mainly instinctive behaviou... the time spent in trial and error learning before the criterion was obtained was significantly greater for flowers of high structural complexity than for those of intermediate and low complexity.
The foraging behavior of bumblebees is discussed from a comparative standpoint with other bees and in relation to food distribution and availability in the environment.
Pollinator Foraging Strategies in Mixed Floral Arrays: Density Effects and Floral Constancy
  • KuninIwasa
  • Biology, Medicine
    Theoretical population biology
  • 1996
The implications of a game-theoretic model of pollinators foraging on a mixed array of two flower species, with individual pollinators either specializing on one or the other, or else acting as generalists, are explored.