Klaus Lunau

Klaus Lunau
Heinrich-Heine-Universität Düsseldorf | HHU · Department of Biology

Prof
I am retired, but open for working on UV-photography, pollination biology, and colour preferences of flower visitors.

About

221
Publications
97,907
Reads
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4,306
Citations
Introduction
Klaus Lunau is the former head of the Institute of Sensory Ecology, Heinrich-Heine-Universität Düsseldorf. Klaus does research in Zoology, Evolutionary Biology and Ecology mostly in the contexts of pollination and mimicry. The current projects are 'The pollen dilemma of bee-pollinated flowers,' 'Colour preferences in stingless bees,' 'Colour vision and colour preferences in the hoverfly Eristalis tenax,' 'Safe sites for pollen transport on bee bodies between conspecific flowers', ' The role of bilateral symmetry of flowers for the landing approach in bumblebees', 'Pollen and stamen mimicry - the world's largest mimicry system.'
Additional affiliations
March 2019 - present
Heinrich-Heine-Universität Düsseldorf
Position
  • Professor
Description
  • I will continue working on pollination biology and sensory ecology as well as nature conservation.
January 2017 - March 2019
Heinrich-Heine-Universität Düsseldorf
Position
  • Professor
Description
  • Master Course in Sensory Ecology: each summer. Bachelor course in Pollination Ecology Field Methods with excursion to Creta or Switzerland, each. Bachelor Course in Evolutionary Ecology, each winter. Lecture about Mimicry or Colour Vision, each winter.
August 1997 - March 2013
Heinrich-Heine-Universität Düsseldorf
Position
  • Retired

Publications

Publications (221)
Preprint
Flowers have many sensory traits to appeal to pollinators, including ultraviolet (UV) absorbing markings, which are well known for attracting bees at close proximity (e.g. < 1 m). While striking UV signals have been thought to attract pollinators also at greater distances of meters, how the signals impact the plant pollination success over distance...
Article
Full-text available
Magnetic resonance imaging (MRI) is the key whole‑body imaging technology for observing processes within a living object providing excellent resolution and contrast between soft tissues. In the present work, we exploited the non‑destructive properties of MRI to track longitudinally the dynamic changes that take place in developing pupae of the Empe...
Article
Background and aims: Colour pattern is a key cue of bee attraction selectively driving the appeal of pollinators. It comprises the main colour of the flower with extra fine patterns indicating a reward focal point such as nectar, nectaries, pollen, stamens, and floral guides. Such definition of floral traits' advertisement guides visitation by the...
Article
Full-text available
We present, for the first time, the spectral reflectance curves of bat-pollinated flowers using as model Ceiba glaziovii (Malvaceae), an impressive tree whose crown turns completely white during the reproductive season, and 13 other chiropterophilous species from Caatinga dry forest, Northeastern Brazil. Flowers from most species reflect light in t...
Article
Blumen sind Kommunikationsstrukturen zwischen Blütenpflanzen und ihren Bestäubern. Dabei spielen visuelle Farbsignale eine herausragende Rolle. Da kein Bestäuber über ein dem Menschen ähnliches Farbsehsystem verfügt, beruht das Verstehen von Blumenfarben auf einer Analyse mit den Augen des betrachtenden Blütenbesuchers. Ultraviolettes Licht hat dab...
Article
A c c e p t e d M a n u s c r i p t 2  Background and Aims Colour pattern is a key cue of bee attraction selectively driving the appeal of pollinators. It comprises the main colour of the flower with extra fine patterns indicating a reward focal point such as nectar, nectaries, pollen, stamens, and floral guides. Such definition of floral traits'...
Article
Full-text available
Colour signals of flowers facilitate detection, spontaneous preference, discrimination and flower constancy by important bee pollinators. At short distances bees orient to floral colour patterns to find a landing platform and collect nutrition, potentially improving the plants' reproductive success when multiple flowers are visited sequentially. In...
Article
Full-text available
Visual floral characters play an important role in shaping plant-pollinator interactions. The genus Fritillaria L. (Liliaceae), comprising approximately 140 species, is described as displaying a remarkable variety of flower colours and sizes. Despite this variation in visual floral traits of fritillaries, little is known about the potential role of...
Article
Full-text available
The evolution of floral traits in animal-pollinated plants involves the interaction between flowers as signal senders and pollinators as signal receivers. Flower colors are very diverse, effect pollinator attraction and flower foraging behavior, and are hypothesized to be shaped through pollinator-mediated selection. However, most of our current un...
Article
Specialization in nectarivory is an uncommon condition among bats, and it is restricted to two subfamilies of neotropical phyllostomids (Glossophaginae and Lonchophyllinae) which encompass dozens of bats with striking morpho‐physiological adaptations to exploit floral nectar (Muchhala and Tschapka 2020). Such bats commonly start the search for flow...
Article
Full-text available
Zusammenfassung: Insekten unterscheiden sich in Körpergröße und Körperbau massiv von Säugetieren. Allein aufgrund der viel höheren Diversität – 6.500 Säugern stehen weit mehr als 1.000.000 Insektenarten gegenüber – sind bereits mehr spezielle Anpassungen bei Insekten zu erwarten. Insekten sind mit allen Sinnesleistungen ausgestattet, die auch bei S...
Article
Full-text available
Plants invest floral resources, including nectar and pigment, with likely consequent reproductive costs. We hypothesized that plants, whose flowers abscise with age, reabsorb nectar and pigment before abscission. This was tested with flowers of Rhododendron decorum, which has large, conspicuous white flowers that increasingly abscise corollas as fl...
Article
Full-text available
Under noiseless experimental conditions, sugar concentration of secreted floral nectar may increase after flower exposure to nearby sounds of pollinator flight (Veits et al. 2019). However, we reject the argument that this represents adaptive plant behaviour, and consider that the appealing analogy between a flower and human ear is unjustified.
Article
Little research has been conducted on the senses of sengis (elephant-shrews, Macroscelidea, Afrotheria, Mammalia); behavioural investigations about the animals' vision are completely missing. Other Afrotheria (manatees, elephants, tenrecs, rock hyraxes) are dichromats, having two types of cone photoreceptors in the retina. We tested the hypotheses...
Article
Full-text available
Signals from flowers attract pollinators, usually with a mutualistic relationship giving reciprocal benefits. However, this relationship carries with it many pitfalls, including various kinds of deception in flowers and illegitimate visits of flower visitors or flower antagonists (van der Kooi et al., 2019). Flowers do not benefit from attracting a...
Article
This article comments on: Zhe Chen, Yang Niu, Chang-Qiu Liu and Hang Sun, Red flowers differ in shades between pollination systems and across continents, Annals of Botany, Volume 126, Issue 5, 9 October 2020, Pages 837–848, https://doi.org/10.1093/aob/mcaa103
Article
Das Farbensehen des Menschen ist nicht mit dem Farbensehen von blütenbesuchenden Bienen zu vergleichen, denn Bienen können ultraviolettes Licht sehen, sind aber unempfindlich für rotes Licht. UV-Photos lassen spezielle, nur im UV sichtbare Muster auf Blüten erkennen. Durch den Vergleich mit Farbphotos gewinnt man eine Vorstellung, wie Bienen die Bl...
Article
Full-text available
In social bees, the choice of food sources is based on several factors, including scent marks, color, and location of flowers. Here, we used similar setups, in which two stingless bee species, Melipona subnitida and Plebeia flavocincta, and the Western honeybee, Apis mellifera, were tested regarding the importance of chemical cues, color cues, and...
Article
Full-text available
Nectar is the most common floral reward for flower-visiting flies, bees, bats and birds. Many flowers hide nectar in the floral tube and preclude sensing of nectar by flower-visitors from a distance. Even in those flowers that offer easily accessible nectar, the nectaries are mostly inconspicuous to the human eye and the amount of nectar is sparse....
Article
Full-text available
The tropical Melastomataceae plant family is characterised by poricidal anthers which constitute a floral filter selecting for buzz‐pollinating bees. Stamens are often dimorphic, sometimes with discernible feeding and pollinating functions. Rhynchanthera grandiflora produces nectarless flowers with four short stamens and one long stamen; all anther...
Article
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Heriades truncorum (Megachilidae) is a specialist bee that forages on Asteraceae and collects pollen by tapping its abdomen on pollen-presenting florets which places the grains directly in the ventral scopa. We tracked pollen transfer by female H. truncorum between conspecific inflorescences of Inula ensifolia and Pulicaria dysenterica by labelling...
Article
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Blütenpflanzen und Hummeln sind gleichermaßen aufeinander angewiesen. Hummeln benötigen den von den Blütenpfl anzen produzierten Pollen und Nektar für sich und ihre Larven und bestäuben die Blüten beim Sammeln der Blütennahrung. Hummeln reagieren auf verschiedene olfaktorische und optische Signale von Blütenpfl anzen, die sie dazu verleiten, bestim...
Article
Full-text available
Like all animals, bees need to consume essential amino acids to maintain their body’s protein synthesis. Perception and discrimination of amino acids are, however, still poorly understood in bees (and insects in general). We used chemotactile conditioning of the proboscis extension response (PER) to examine (1) whether Bombus terrestris workers are...
Article
Full-text available
The chive gnat, Bradysia odoriphaga, is a notorious pest of Allium species in China. Colour trapping is an established method for monitoring and control of Bradysia species. In order to clarify the effect of colour preference of B. odoriphaga for the perched substrate, multiple-choice tests were used to assess the response of the chive gnat to diff...
Data
The randomness test of choice for chive gnat Bradysia odoriphaga at 4 chambers with same colour. (DOCX)
Article
Full-text available
Bee-pollinated plants face a dilemma in that bees both passively transport pollen grains among conspecific flowers and actively collect pollen to feed their larvae. Therefore, mechanisms that reduce pollen collection by bees have evolved in melittophilous plants. Malvaceae pollen is uncollectable for corbiculate bees which has previously been ascri...
Preprint
Full-text available
The chive gnat, Bradysia odoriphaga , is a notorious pest of Allium species in China. Colour trapping is an established method for monitoring and controlling of Bradysia species. In order to clarify the effect of colour preference of B. odoriphaga for the egg-laying substrate, multiple-choice tests were employed to assess the spontaneous response o...
Article
Full-text available
Zusammenfassung: In Wahlversuchen haben wir Hinweise dafür gewonnen, dass die Weibchen der Leuchtschabe Lucihormetica verrucosa Männchen mit roten Pronotumfl ecken, d.h. mit einem hohen Carotinoidgehalt der Epidermis, die unter der transparenten Pronotum-Cuticula liegt, attraktiver fi nden als Männchen mit weißen oder gelben Flecken, deren Epidermi...
Article
Full-text available
Colour preferences and colour learning of the hoverfl y Eristalis tenax 27 Entomologie heute 30 (2018) Entomologie heute 30 (2018): 27-44 The Yellow Specialist: Colour Preferences and Colour Learning of the Hoverfly Eristalis tenax (Diptera: Syrphidae) Der Gelbspezialist: Farbpräferenzen und Farbenlernen der Schwebfliege Eristalis tenax (Diptera: S...
Article
Full-text available
Bees use floral colour as a major long distance orientation cue. While it is known for bumblebees and honeybees that dominant wavelength (≙ colour hue), colour contrast and spectral purity (≙ saturation) are crucial for flower detection and discrimination, only little is known about colour preferences in stingless bees (Meliponini). In this experim...
Data
Semi-randomized order of dual choice tests. (UVB = UV-blue; B = blue; UVY = UV-yellow; Y = yellow; W = white; R = red; P+ = high spectral purity; P- = low spectral purity; I+ = high intensity; I- = low intensity; UV- = UV-absorbing; UV+ = UV-reflecting). (TIF)
Data
Mixture ratios of colour pigments and calculated colour parameters of compacted stimuli. (Black* = see stimulus Black; Grey* = see mixture Grey; Yellow-grey* = see mixture Yellow-grey; P+ = high spectral purity; P- = low spectral purity; I+ = high intensity; I- = low intensity; UV- = UV-absorbing; UV+ = UV-reflecting). (TIF)
Article
Full-text available
Droneflies, imagoes of the hoverfly Eristalis tenax, are known to possess a preference for yellow flowers, i.e. they prefer to visit yellow flowers and prefer to extend the proboscis to yellow colours. In this study we disentangle these colour preferences by investigating the landing reaction and proboscis reflex with particular reference to intens...
Article
Full-text available
The colour vision system of bees and humans differs mainly in that, contrary to humans, bees are sensitive to ultraviolet light and insensitive to red light. The synopsis of a colour picture and a UV picture is inappropriate to illustrate the bee view of flowers, since the colour picture does not exclude red light. In this study false-colour pictur...
Article
Full-text available
Background: Flower coloration is a key enabler for pollinator attraction. Floral visual signals comprise several components that are generated by specific anatomical structures and pigmentation, and often have different functions in pollinator attraction. Anatomical studies have advanced our understanding of the optical properties of flowers, and...
Article
Full-text available
Edited by CI Peter Keel-flowers have evolved structures and mechanisms to protect their pollen and enhance pollen removal by pollinators. Polygala myrtifolia L. (Polygalaceae) has a keel-flower exclusively pollinated by carpenter bees (Hymenoptera: Apidae). The keel also has an elaborate, fluffy appendage (crest) which has been proposed to function...
Article
Full-text available
Flower visiting Eristalis hoverflies feed on nectar and pollen and are known to rely on innate colour preferences. In addition to a preference for visiting yellow flowers, the flies possess an innate proboscis reflex elicited by chemical as well as yellow colour stimuli. In this study we show that the flies’ proboscis reflex is only triggered by ye...
Data
Artificial flowers and experimental setups. Training and test artificial flowers of all experiments are shown against the background used. (PDF)
Data
Spectral reflectance properties of the tested colour stimuli and backgrounds. The spectral reflectance of colour stimuli and backgrounds is shown in the range of wavelength between 300nm and 700nm. (TIF)
Data
Choice test of an Eristalis tenax fly trained to artificial flowers with a large-sized spot. The trained fly chooses between grey artificial flowers with a large spot of either blue or yellow colour following training to artificial flowers with large blue spot. (WMV)