Intra-floral resource partitioning between endemic and invasive flower visitors: consequences for pollinator effectiveness

2010 ◽  
Vol 35 (6) ◽  
pp. 760-767 ◽  
Author(s):  
ROBERT R. JUNKER ◽  
RICHARD BLEIL ◽  
CURTIS C. DAEHLER ◽  
NICO BLÜTHGEN
Keyword(s):  
Resource Partitioning ◽  
Pollinator Effectiveness ◽  
Flower Visitors ◽  
Floral Resource ◽  
Floral Resource Partitioning

scholarly journals Floral resource partitioning by individuals within generalised hoverfly pollination networks revealed by DNA metabarcoding

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Andrew Lucas ◽  
Owen Bodger ◽  
Berry J. Brosi ◽  
Col R. Ford ◽  
Dan W. Forman ◽  
...  
Keyword(s):  
Resource Partitioning ◽  
Dna Metabarcoding ◽  
Floral Resource ◽  
Floral Resource Partitioning

Floral resource partitioning by ants and bees in a jambolan Syzygium jambolanum (Myrtaceae) agroforestry system in Brazilian Meridional Amazon

2012 ◽  
Vol 85 (1) ◽  
pp. 105-111 ◽  
Author(s):  
Wesley Dáttilo ◽  
Rodrigo L. Martins ◽  
Vera Uhde ◽  
Janaína C. Noronha ◽  
Fernando P. Florêncio ◽  
...  
Keyword(s):  
Resource Partitioning ◽  
Agroforestry System ◽  
Floral Resource ◽  
Floral Resource Partitioning

scholarly journals Pollinator importance networks illustrate the crucial value of bees in a highly speciose plant community

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Gavin Ballantyne ◽  
Katherine C. R. Baldock ◽  
Luke Rendell ◽  
P. G. Willmer
Keyword(s):  
Plant Species ◽  
Community Level ◽  
Taxonomic Resolution ◽  
Pollen Deposition ◽  
Pollinator Effectiveness ◽  
Flower Visitors ◽  
Pollinator Importance ◽  
Visitation Frequency ◽  
Pollinator Performance ◽  
Number Of Plant Species

AbstractAccurate predictions of pollination service delivery require a comprehensive understanding of the interactions between plants and flower visitors. To improve measurements of pollinator performance underlying such predictions, we surveyed visitation frequency, pollinator effectiveness (pollen deposition ability) and pollinator importance (the product of visitation frequency and effectiveness) of flower visitors in a diverse Mediterranean flower meadow. With these data we constructed the largest pollinator importance network to date and compared it with the corresponding visitation network to estimate the specialisation of the community with greater precision. Visitation frequencies at the community level were positively correlated with the amount of pollen deposited during individual visits, though rarely correlated at lower taxonomic resolution. Bees had the highest levels of pollinator effectiveness, with Apis, Andrena, Lasioglossum and Osmiini bees being the most effective visitors to a number of plant species. Bomblyiid flies were the most effective non-bee flower visitors. Predictions of community specialisation (H2′) were higher in the pollinator importance network than the visitation network, mirroring previous studies. Our results increase confidence in existing measures of pollinator redundancy at the community level using visitation data, while also providing detailed information on interaction quality at the plant species level.

Types of Flower Visitors: Syndromes, Constancy, and Effectiveness

2011 ◽  
Author(s):  
Pat Willmer
Keyword(s):  
Adaptive Radiation ◽  
Convergent Evolution ◽  
Pollination Syndromes ◽  
Pollinator Effectiveness ◽  
Flower Constancy ◽  
Flower Visitors ◽  
Floral Constancy ◽  
Effective Pollinators

This chapter examines pollination syndromes, floral constancy, and pollinator effectiveness. Flowers show enormous adaptive radiation, but the same kind of flower reappears by convergent evolution in many different families. Thus many families produce rather similar, simple bowl-shaped flowers like buttercups; many produce similar zygomorphic tubular lipped flowers; and many produce fluffy flower heads of massed (often white) florets. These broad flower types are the basis of the idea of pollination syndromes—the flowers have converged on certain morphologies and reward patterns because they are exploiting the abilities and preferences of particular kinds of visitor. After providing an overview of pollination syndromes, the chapter explains why pollination syndromes can be defended. It then considers flower constancy, along with the distinction between flower visitors and effective pollinators. It concludes with some observations on how flower visitors can contribute to speciation of plants through specialization and through their constancy.

scholarly journals Floral biology and a pollinator effectiveness test of the diurnal floral visitors of Tabernaemontana undulata Vahl. (Apocynaceae) in the understory of Amazon Rainforest, Brazil

2011 ◽  
Vol 25 (2) ◽  
pp. 380-386 ◽  
Author(s):  
Thaysa Nogueira de Moura ◽  
Antonio Carlos Webber ◽  
Liliane Noemia Melo Torres
Keyword(s):  
Relative Abundance ◽  
Floral Biology ◽  
Fruit Production ◽  
Primary Forest ◽  
Pollinator Effectiveness ◽  
Indirect Measure ◽  
Flower Visitors ◽  
Functional Regions ◽  
Disturbed Area ◽  
Floral Visitor

In this paper we examined the floral biology, per-visit effectiveness, frequency of visits and relative abundance of the diurnal floral visitor taxa of T. undulata (Apocynaceae) at two populations located in the primary forest and in a disturbed area connected to the continuous forest. Its hermaphrodite flowers show a long and narrow floral tube and introrse anthers form a cone around the apex of the style head where the pollen is deposited. The stigmatic head has three functional regions, in a complex pollination mechanism favoring cross-pollination. In the pollinator censuses conducted in the primary forest population we registered Eulaema bombiformis. In the disturbed area Euglossa sp. was responsible for visits on T. undulata fl owers. Eulaema bombiformis was not absent in the disturbed area, but preferred to forage on pollen and nectar-rich flowers of two neighboring flowering species. In the primary forest, T. undulata was the only fl owering treelet at the end of the dry season. Signifi cant differences were not observed regarding the frequency of visits and relative abundance among the diurnal flower visitors at both sites. In the per-visit effectiveness experiment among flower visitors, we observed one fruit produced aft er E. bombiformis' visits. Due to the complex breeding system of T. undulata in that it is characterized by very low fruit production even under natural conditions, an indirect measure of pollinator effectiveness is needed in at a future stage of this study in order to clarify the role of these bee species as pollinators of T. undulata.

scholarly journals Floral resource availability of Dicliptera squarrosa (Acanthaceae) and its dependence on hummingbirds for fruit formation in a forest fragment of Central Brazil

2019 ◽  
Vol 152 (1) ◽  
pp. 68-77
Author(s):  
Raphael Matias ◽  
Marco Túlio Furtado ◽  
Silvia B. Rodrigues ◽  
Hélder Consolaro
Keyword(s):  
Mating Systems ◽  
Flowering Phenology ◽  
Floral Biology ◽  
Floral Resources ◽  
Forest Fragment ◽  
Important Species ◽  
Flower Visitors ◽  
Central Brazil ◽  
Nectar Feeding ◽  
Floral Resource

Background and aims – Hummingbirds are dependent and specialized on nectar-feeding, and many plants depend upon them for pollination. However, the degree of plant-pollinator interdependence varies greatly among species; thus, information on plant mating systems and availability of resources may help to clarify the dependence of interacting organisms. The goals of this study were to (1) quantify the floral resource available during the flowering of Dicliptera squarrosa Nees for comparison with other co-flowering ornithophilous species, and to (2) determine the importance of floral visitors for the reproductive success of this plant.Methods – Data collection was performed in a forest fragment within the urban perimeter of Catalão, Goiás, from September 2012 to August 2013. We investigated the flowering phenology, floral biology, nectar characteristics, flower visitors and mating systems of D. squarrosa. Additionally, we evaluated the amount of floral resource offered (number of flowers and energy in joules) by co-flowering ornithophilous species within an area of 6000 m2 for comparison with D. squarrosa.Key results – Dicliptera squarrosa presents flowers adapted to pollination by hummingbirds, which act as the sole pollinator group for flowers of this species. Flowering occurs from June to September and is synchronous with five other co-flowering species. During the months between July and September, D. squarrosa is the main food source for hummingbirds in the area, offering more floral resources than all of the other five ornithophilous species together. Plants of this species are self-compatible, but they depend on hummingbirds to transfer pollen; levels of autonomous autogamy were low.Conclusions – We suggest that D. squarrosa is an important species for maintaining hummingbirds in the forest fragment due to its high production of nectar resources. In addition, data on floral biology, flower visitors, and mating systems showed the importance of hummingbirds for reproduction of D. squarrosa, suggesting a mutualistic interaction between plant and hummingbirds.

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