Variation in composition of two bumble bee species across communities affects nectar robbing but maintains pollinator visitation rate to an alpine plant,Salvia przewalskii

2018 ◽  
Vol 43 (3) ◽  
pp. 363-370 ◽  
Author(s):  
ZHONG-MING YE ◽  
XIAO-FANG JIN ◽  
DAVID W. INOUYE ◽  
QING-FENG WANG ◽  
CHUN-FENG YANG
Keyword(s):  
Bumble Bee ◽  
Nectar Robbing ◽  
Alpine Plant ◽  
Pollinator Visitation ◽  
Visitation Rate ◽  
Pollinator Visitation Rate

scholarly journals High selfing capability and low pollinator visitation in the epiphyte Pitcairnia heterophylla (Bromeliaceae) at a Costa Rican cloud forest

2016 ◽  
Author(s):  
Luis D. Ríos ◽  
Alfredo Cascante-Marín
Keyword(s):  
Cloud Forest ◽  
Video Recording ◽  
Floral Traits ◽  
Nectar Production ◽  
Pollinator Visitation ◽  
Visitation Rate ◽  
Pollinator Visitation Rate ◽  
Hand Pollination ◽  
Pollination Systems ◽  
Epiphytic Bromeliads

AbstractMost epiphytic bromeliads exhibit specialized pollination systems likely to promote out-crossing but, at the same time, possess floral traits that promote autonomous selfing. Adaptations that promote selfing in flowering plants with specialized pollination systems have been considered as a mechanism for reproductive assurance. In this paper, we analyzed the breeding system and pollinator visitation rate of the hummingbird-pollinated bromeliad Pitcairnia heterophylla in order to see if they fit such trend. We performed hand pollination experiments, video recording of floral visitors, and recorded floral traits in order to describe the reproductive and pollination system of the studied species in a cloud forest in Costa Rica. Results from the pollination treatments indicated that P. heterophylla is self-compatible (SCIf = 0.77), capable of autonomous pollination (AFIf = 0.78), and non-agamospermous (AGf = 0.01). Floral traits, such as scentless red flowers, with tubular corolla and nectar production, suggested ornithophily which was confirmed by the video recording of Lampornis calolaemus (Trochilidae) visiting flowers. However, the visitation rate was low (0.6 visits day-1 per plant) based on 918 hours of video recording using trail cameras. We suggest that the high selfing capability of the studied population of P. heterophylla might be related to the low pollinator visitation rate. If low pollinator visitation is common among hummingbird-pollinated and epiphytic bromeliads, then selfing could be a widespread mechanism to enhance their reproductive success.

Linking pollinator visitation rate and pollen receipt

2003 ◽  
Vol 90 (11) ◽  
pp. 1612-1618 ◽  
Author(s):  
E. Cayenne Engel ◽  
Rebecca E. Irwin
Keyword(s):  
Pollinator Visitation ◽  
Visitation Rate ◽  
Pollinator Visitation Rate ◽  
Pollen Receipt

scholarly journals Quantitative importance of staminodes for female reproductive success in Parnassia palustris under contrasting environmental conditions

2003 ◽  
Vol 81 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Sylvi M Sandvik ◽  
Ørjan Totland
Keyword(s):  
Reproductive Success ◽  
Seed Set ◽  
Plant Traits ◽  
Female Reproduction ◽  
Female Reproductive Success ◽  
Pollinator Visitation ◽  
Visitation Rate ◽  
Pollinator Visitation Rate ◽  
Insect Activity ◽  
Pollination Strategy

The five sterile stamens, or staminodes, in Parnassia palustris act both as false and as true nectaries. They attract pollinators with their conspicuous, but non-rewarding tips, and also produce nectar at the base. We removed staminodes experimentally and compared pollinator visitation rate and duration and seed set in flowers with and without staminodes in two different populations. We also examined the relative importance of the staminode size to other plant traits. Finally, we bagged, emasculated, and supplementary cross-pollinated flowers to determine the pollination strategy and whether reproduction was limited by pollen availability. Flowers in both populations were highly dependent on pollinator visitation for maximum seed set. In one population pollinators primarily cross-pollinated flowers, whereas in the other the pollinators facilitated self-pollination. The staminodes caused increased pollinator visitation rate and duration to flowers in both populations. The staminodes increased female reproductive success, but only when pollen availability constrained female reproduction. Simple linear regression indicated a strong selection on staminode size, multiple regression suggested that selection on staminode size was mainly caused by correlation with other traits that affected female fitness.Key words: staminodes, insect activity, seed set, spatial variation, Parnassia palustris.

Pollinator gardens more than triple in visitation rate and diversity of flower-visiting insects than other ornamental plantings in Kingston, Ontario

2018 ◽  
Author(s):  
Marika Vogelzang
Keyword(s):  
Urban Areas ◽  
Unit Area ◽  
The Other ◽  
Individual Plant ◽  
University Campus ◽  
Pollinator Visitation ◽  
Visitation Rate ◽  
Queen's University ◽  
Flower Visiting ◽  
Pollinator Populations

In this study I determined the effectiveness of pollinator gardens by testing if visitation rate and diversity of flower-visiting insects is higher in pollinator gardens compared to other ornamental plantings. I observed pollinator visitation for individual plant taxa, per unit area, in three different pollinator gardens, eight ornamental gardens and eight ornamental planters on the Queen’s University campus in Kingston, Ontario, Canada. Visitation was about 4- times higher in pollinator gardens compared to the other two ornamental garden types and visitor richness (the number of types of pollinators) in pollinator gardens was about 6- times higher compared to ornamental gardens, and about 3- times higher compared toornamental planters. The results of this study conclude that the planting of pollinator gardens is an effective way of supporting pollinator populations in urban areas.

Drifting bumble bee (Hymenoptera: Apidae) workers in commercial greenhouses may be social parasites

2004 ◽  
Vol 82 (12) ◽  
pp. 1843-1853 ◽  
Author(s):  
Anna L Birmingham ◽  
Shelley E Hoover ◽  
Mark L Winston ◽  
Ron C Ydenberg
Keyword(s):  
Social Insect ◽  
Social Parasitism ◽  
Worker Reproduction ◽  
Bumble Bee ◽  
Nectar Robbing ◽  
Social Parasites ◽  
Aggressive Interactions ◽  
Insect Societies ◽  
Bombus Occidentalis ◽  
Behavioural Consequence

Commercial greenhouses require high densities of managed bumble bee (Bombus occidentalis Greene, 1858 and Bombus impatiens Cresson, 1863) colonies to pollinate crops such as tomatoes (Lycopersicon esculentum Miller). We examined drifting, a behavioural consequence of introducing closely aggregated colonies into greenhouse habitats, to determine possible explanations for observed drifting frequencies. Bee drift is normally associated with increased individual mortality and disease transfer between colonies. In this study, individual bees frequently drifted into and remained within foreign colonies. More drifting bees were found in colonies with higher worker and brood populations and greater pollen stores. Increased intracolony aggressive interactions were not associated with a higher number of drifting bees. Drifting bees had a significantly greater number of mature eggs in their ovaries than did resident worker bees residing in colonies hosting drifters, suggesting that drifting could potentially increase the fitness of individual worker bees and may not be solely a function of disorientation and (or) nectar robbing. Taken together, our results suggest that drifting of workers into foreign colonies within greenhouses may demonstrate a predisposition to social parasitism. This selfish worker reproduction challenges our previous understanding of social insect societies as being cooperative societies.

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