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Specialization for pollination by beetles and wasps : the role of lollipop hairs and fragrance in Satyrium microrrhynchum (Orchidaceae)

Title data

Johnson, Steven D. ; Ellis, Allan E. ; Dötterl, Stefan:
Specialization for pollination by beetles and wasps : the role of lollipop hairs and fragrance in Satyrium microrrhynchum (Orchidaceae).
In: American Journal of Botany. Vol. 94 (2007) Issue 1 . - pp. 47-55.
ISSN 1537-2197
DOI: https://doi.org/10.3732/ajb.94.1.47

Abstract in another language

Exposed nectar presentation is a key trait in flowers specialized for pollination by short-tongued insects. We investigated the pollination of Satyrium microrrhynchum, a rare South African orchid in which nectar is secreted as droplets on long floral hairs(‘‘lollipop hairs’’) at the mouth of a shallow labellum. Our observations indicate that this orchid is pollinated specifically by two insect species: a cetoniid beetle (Atrichelaphinus tigrina) and a pompilid wasp (Hemipepsis hilaris). Both insects have shortmouth parts and remove nectar from the hairs with sweeping motions of their mouthparts. Pollinaria become attached to the upper surface of their heads while they feed on the nectar. Beetles damage the hairs while feeding, which may explain the positive relationship between hair damage and pollination success in plants of S. microrrhynchum from populations where beetles were common. The orchid has cryptic green-yellow flowers with spectral reflectance similar to that of its leaves. The fragrance from plants in three populations, analyzed using gas chromatography coupled to mass spectrometry, was dominated by various terpenoids; linalool was the most abundant. Plants in different populations emitted similar compounds, but eugenol and derivatives of this compound were found in only one of the three populations. In an electrophysiological study (gaschromatography coupled to electroantennography), using antennae of A. tigrina, clear signals were elicited by some of the floralscent compounds.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER43115
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Systematics
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 14 Jul 2015 06:21
Last Modified: 14 Jul 2015 06:21
URI: https://eref.uni-bayreuth.de/id/eprint/16388