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Arum maculatum (Araceae) - Anthese und Pollination


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Formal Metadata

Title Arum maculatum (Araceae) - Anthese und Pollination
Alternative Title Arum maculatum (Araceae) - Anthesis and Pollination
Author Brustkern, Paul
License No Open Access License:
German copyright law applies. This film may be used for your own use but it may not be distributed via the internet or passed on to external parties.
DOI 10.3203/IWF/E-2594
IWF Signature E 2594
Publisher IWF (Göttingen)
Release Date 1982
Language German
Producer Paul Brustkern
Production Year 1977

Technical Metadata

IWF Technical Data Film, 16 mm, LT, 52 m ; F, 5 min

Content Metadata

Subject Area Life Sciences
Abstract Kesselfallenprinzip bei der Bestäubung des Aronstabs. Anthese und Welken der Infloreszenz; Schmetterlingsmücken (Psychoda spec.) als Bestäuber. Protogynie. Normalfrequenz und Zeitraffung.
In the film the interesting example of a trap plant, catching insects for pollination, as to be found in Arum maculatum L., the Fly Trap, is demonstrated. After introduction by outdoor pictures of a population of this species, just being in the flowering period, the whole of course of the anthesis of this monoecious and protoynous inflorescence is shown. Impressive close-up pictures of the fertile part of the inflorescence situated in the chamber, formed by the lower part of the spathe, follow. This part is constructed by revolving of the spathe, a large hypsophyll at the base of the inflorescence, and by tieing up form the upper part of the spathe, which unrolls before the anthesis starts. This chamber functions as a trap for small insects, which landing on the upper smooth part of the spathe hurl down into the trag. The chamber contains the spadix of the inflorescence, covered at the base with female flowers consisting of naked ovaries with hairy stigmas and above them with male floswers of only 3-4 stamens. Just beneath the corded part of the spathe some sterile female flowers act as bristles like a weir-basket. On the top of the spadix a smooth purplish appendix juts out of the chamber, standing before the unrolled upper part of the spathe and emanating an urine-like scent. the female flowers at first ripe in the afternoon and exudeduring the night small droplets of nectar by the stigma. if insects are missing, these droplets are resorbed, while otherwise trapped insectsmtake them up. During the following male period of the inflorscence, which starts on the next morning and runs quickly, the antheres open and discharge the pollen grains. These trinkle down to the insects, small midges of the genus Psychoda, enabling them to pollinate female flowers of an other inflorescenece, if they leave the trap after wilting of the bristles of the weirbasket about 24 hours later and hurling down to the chamber of the next plant being in anthesis. The film ends eith outdoor pictures of the infructescences of Arum maculatum in the autumn with red berries.
Keywords Mücke / Schmetterlingsmücke
Gefleckter Aronstab
Arum maculatum
Fallen / Kesselfalle
Arum maculatum
wild arum
Lords and Ladies
moth flies
drain flies

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