Journal ArticleDOI
The Diascia (Scrophulariaceae) window: an orientation cue for oil-collecting bees.
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Observations in natural and experimental situations suggest that the window of Diascia section Racemosae is used as an orientation cue by oil-collecting bees.About:
This article is published in Botanical Journal of the Linnean Society.The article was published on 1990-02-01. It has received 22 citations till now. The article focuses on the topics: Ultraviolet light.read more
Citations
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Journal ArticleDOI
Twin oil sacs facilitate the evolution of a novel type of pollination unit (meranthium) in a South African orchid.
TL;DR: Molecular data indicate that the evolution of the Huttonaea-type meranthium was dependent on the prior evolution ofThe oil flower/oil bee relationship and was facilitated by the presence of oil in two separate structures (petal sacs) that were not physically constrained to remain in close proximity.
Journal ArticleDOI
A spur-ious inference: Pollination is not more specialized in long-spurred than in spurless species in Diascia-Rediviva mutualisms
Hilke Hollens,Timotheüs van der Niet,Timotheüs van der Niet,Timotheüs van der Niet,Ruth J. Cozien,Ruth J. Cozien,Michael Kuhlmann,Michael Kuhlmann +7 more
TL;DR: Assessments of seed set following single visits by pollinators revealed no difference in per-visit effectiveness among Rediviva species, suggesting that morphological matching does not necessarily affect pollen deposition efficiency and that variation in female reproductive success determined by matching between flower and pollinator morphology is an unlikely driver of spur-length evolution in Diascia.
Journal ArticleDOI
Floral colour change in Byrsonima variabilis (Malpighiaceae) as a visual cue for pollen but not oil foraging by oil-collecting bees
Brehna Teixeira de Melo,Theo Mota,Clemens Schlindwein,Yasmine Antonini,Reisla Oliveira,Reisla Oliveira +5 more
TL;DR: It is suggested that standard petals, in the species studied and others of the genus, like nectar guides, act as pollen guides, which oil-collecting females use to detect pollen-rich flowers.
Journal ArticleDOI
Two new Diascia species (Scrophulariaceae) from the Little Karoo.
TL;DR: Two yellow-flowered Diascia species belonging to section diascia are described and compared to D. cuneata, restricted to the Little Karoo, but their distributions are allopatric.
Book ChapterDOI
Floral Ecology: Report on the Years 1988 (1987) to 1991 (1992)
TL;DR: Flower ecologists, studying and measuring variation and morphological and behavioral modifications in the interactions they observe, are more and more in a position to evaluate directly selectional pressure, its dynamics in space and time, which then allows the understanding of the basic forces of adaptive evolution.
References
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Journal ArticleDOI
Pigment distribution, light reflection and cell structure in petals
TL;DR: Petal structure and the distribution of pigments in petals were studied in relation to the functional anatomy of petals and the ways in which petals absorb and reflect light.
Reizmetrische Untersuchung des Farbensehens der Bienen
TL;DR: In this paper, the Bienensinn der Bienen is wesentlich leistungsfahiger, d. h., die Zahl der unterscheidbaren Farbtone is a groser als bisher angenommen: Auch innerhalb der Kuhnschen Hauptspektralbereiche, deren Existenz bestatigt wurde, sind die bienen zu echter Wellenlangenunterscheideung befahigt.
Blumenfarben, wie sie die Bienen sehen
TL;DR: In this paper, a quantitativ auswertbaren, fotografischen Methode in den 3 Grundspektralbereichen des Bienenfarbsystems (Gelb-, Blau-and UV-Bereich) gestattete auf Grund der Kompensativbeziehungen zwischen diesen Bereichen (Daumeb 1956) die ungefahre Berechnung von „BienenFarbton“ and „Unbunt
Journal ArticleDOI
Pollinator behaviour and natural selection for flower colour in Delphinium nelsonii
TL;DR: Evidence is presented that discrimination occurs because white flowers have inferior ‘nectar guides’ and therefore require longer handling times than blue flowers, and pollinators may experience lower net rates of energy intake on white flowers, a sufficient reason for undervisitation by optimally-foraging animals.
Journal ArticleDOI
Ultraviolet floral patterns as functional orientation cues in hymenopterous pollination systems
TL;DR: Morphological and physiological changes in the floral colour patterns of both species following pollination appear to inhibit visitation by bees, and the significance of U.V. floral patterns was also considered.
Related Papers (5)
Pollinator adaptation to oil-secreting flowers-rediviva and diascia.
Kim E. Steiner,V. B. Whitehead +1 more
Oil flowers and oil bees: further evidence for pollinator adaptation.
Kim E. Steiner,V. B. Whitehead +1 more