期刊
SOUTH AFRICAN JOURNAL OF BOTANY
卷 75, 期 4, 页码 757-761出版社
ELSEVIER
DOI: 10.1016/j.sajb.2009.06.015
关键词
Batesian floral mimicry; Disa draconis complex (Orchidaceae); Geographic mosaic of coevolution; Pelargonium; Plant-pollinator interactions; Southern Africa; Speciation; Tabanidae
资金
- NSF IGERT [0333408]
- NRF (South Africa)
- Division Of Graduate Education
- Direct For Education and Human Resources [0333408] Funding Source: National Science Foundation
Long-proboscid flies have been documented as the primary pollinators in several long-tubed floral guilds in Southern Africa. These specialized pollination systems have become models for studying floral mimicry, adaptation, and coevolution. In this study we document a previously unknown pollinator of Pelargonium stipulaceum (L.f.) Willd. (Geraniaceae) and Disa karooica Johnson & Linder, a species within the Disa draconis complex (Orchidaceae), and propose the Occurrence of a new floral model-mimic system in the semiarid interior of South Africa. We find that Philoliche gulosa Wiedemann (Tabanidae) is a pollinator of the putative floral model, Pelargonium stipulaceum and its floral mimic, Disa karooica. We document similarities in floral spur/tube length, spectral reflectance, absence of scent, presence of nectar guides, and overlapping phenology and distribution in these two sympatric plant species. We use colour spectrum analyses to test the idea that divergence in flower colour in the D. draconis complex is driven by adaptation to model Pelargonium species of different colours. (C) 2009 SAAB. Published by Elsevier B.V. All rights reserved.
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