Pollination Biology of Nemophila menziesii (Hydrophyllaceae) with Comments on the Evolution of Oligolectic Bees

Evolution ◽  
1972 ◽  
Vol 26 (3) ◽  
pp. 373 ◽  
Author(s):  
Robert William Cruden
Keyword(s):  
Pollination Biology ◽  
Oligolectic Bees ◽  
Nemophila Menziesii

Pollination biology ofSymphonia globulifera (Clusiaceae)

1996 ◽  
Vol 200 (1-2) ◽  
pp. 101-110 ◽  
Author(s):  
V. Bittrich ◽  
Maria C. E. Amaral
Keyword(s):  
Pollination Biology

Pollination biology of the Proteaceae in Australia and southern Africa

1987 ◽  
Vol 12 (4) ◽  
pp. 387-421 ◽  
Author(s):  
BRIAN G. COLLINS ◽  
TONY REBELO
Keyword(s):  
Southern Africa ◽  
Pollination Biology

Pollination biology of Geissomeria pubescens Nees (Acanthaceae) in a forest remnant in central Brazil

Botany ◽  
2014 ◽  
Vol 92 (3) ◽  
pp. 215-222 ◽  
Author(s):  
Raphael Matias ◽  
Hélder Consolaro
Keyword(s):  
Fruit Set ◽  
Floral Biology ◽  
Pollination Biology ◽  
Energy Availability ◽  
Open Pollination ◽  
Forest Fragment ◽  
Central Brazil ◽  
Forest Remnant ◽  
Fruit Formation ◽  
Nectar Availability

Specialized plants like those in genus Geissomeria Lindl. (Acanthaceae) seem to depend directly on pollination by hummingbirds for reproduction. The goal of this study was to investigate the pollination biology of Geissomeria pubescens Nees (Acanthaceae) in a forest fragment in the municipality of Catalão, state of Goiás, Brazil, including aspects of morphology, floral biology, energy availability from nectar, and reproductive system. Geissomeria pubescens has pendulous red flowers, tubular corolla, diurnal anthesis, and no odor. These floral traits characterize G. pubescens as an ornithophilous species. The total amount of energy available from nectar was 8.60 ± 2.87 cal·flower–1, and each individual produced up to 22.53 cal·day–1. Based on the resources offered by G. pubescens, the fragment studied may support up to 94.6 hummingbirds during the peak of nectar availability. Hummingbirds were the only flower visitors, and Thalurania furcata (Gmelin, 1788) was the main pollinator. Flowers from manual cross- and self-pollination treatments produced fruits, but fruit set was low compared with open pollination. These results, along with the lack of fruit set from agamospermy and spontaneous selfing, demonstrate the importance of hummingbirds for pollen flow and, consequently, for fruit formation in G. pubescens.

scholarly journals Bumblebee Preadators Reduce Pollinator Density and Plant Fitness

2004 ◽  
Vol 28 ◽  
pp. 94-97
Author(s):  
Reuven Dukas
Keyword(s):  
Food Reward ◽  
Fruit Set ◽  
Field Work ◽  
Pollination Biology ◽  
Food Sources ◽  
Plant Fitness ◽  
Predatory Activity ◽  
Selective Agents ◽  
Flower Visiting ◽  
Pollination Systems

Research in pollination biology has focused on the interactions between animals and the flowers they visit for food reward. However, other selective agents, including predators, seed feeders and herbivores, may affect pollination systems. Because flowers are predictable food sources for a variety of species, flowers are also reliable sites at which predators can locate flower-visiting animals. Prominent among pollinators' predators are beewolves (Philanthus spp), common sphecid wasps (Sphecidae) that prey almost exclusively on bees. My field work over three years indicates, first, that an area of approximately 50 square km surrounding a single bumblebee wolf (Philanthus bicinctus) aggregation had a low bumblebee (Bombus spp) density caused by intense predation by the wasps, and, second, that fruit set of the bumblebee pollinated western monkshood (Aconitum columbianum) was significantly lower at locations and times of bumblebee wolf activity than at control locations and times with no such predatory activity. These results indicate that predation can sometimes alter plant­pollinator interactions.

scholarly journals Quantitative genetics of response to competitors in Nemophila menziesii: a field experiment.

Genetics ◽  
1995 ◽  
Vol 139 (1) ◽  
pp. 397-406 ◽  
Author(s):  
R G Shaw ◽  
G A Platenkamp ◽  
F H Shaw ◽  
R H Podolsky
Keyword(s):  
Field Experiment ◽  
Genetic Variance ◽  
Plant Density ◽  
Additive Genetic Variance ◽  
Natural Populations ◽  
Plant Size ◽  
Heterogeneous Environments ◽  
Environmental Complexity ◽  
Sources Of Variation ◽  
Nemophila Menziesii

Abstract Recent investigations of evolution in heterogeneous environments have begun to accommodate genetic and environmental complexity typical of natural populations. Theoretical studies demonstrate that evolution of polygenic characters depends heavily on the genetic interdependence of the expression of traits in the different environments in which selection occurs, but information concerning this issue is scarce. We conducted a field experiment to assess the genetic variability of the annual plant Nemophila menziesii in five biotic regimes differing in plant density and composition. Significant, though modest, additive genetic variance in plant size was expressed in particular treatments. Evidence of additive genetic tradeoffs between interspecific and intraspecific competitive performance was found, but this result was not consistent throughout the experiment. Two aspects of experimental design may tend to obscure genetically based tradeoffs across environments in many previously published experiments: (1) inability to isolate additive genetic from other sources of variation and (2) use of novel (e.g., laboratory) environments.

Semen-Like Floral Scents and Pollination Biology of a Sapromyophilous Plant Stemona japonica (Stemonaceae)

2015 ◽  
Vol 41 (3) ◽  
pp. 244-252 ◽  
Author(s):  
Gao Chen ◽  
Andreas Jürgens ◽  
Lidong Shao ◽  
Yang Liu ◽  
Weibang Sun ◽  
...  
Keyword(s):  
Pollination Biology ◽  
Floral Scents
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