Plant Ecology

, 184:43

Minor pollinator–prey conflict in the carnivorous plant, Drosera anglica

  • Gillian L. Murza
  • Joanne R. Heaver
  • Arthur R. Davis
Article

Abstract

We studied the physical and temporal isolation of two arthropod guilds interacting with Drosera anglica Huds., a terrestrial carnivorous plant. Flowers are separated from basal trap leaves by a leafless stalk. Since arthropods are potentially employed both as prey and pollinators, we asked whether separation of traps from flowers reduces the frequency with which flower visitors are captured by the leaves. Plants captured prey throughout the season, with peak trapping activity occurring before flowering began. The diverse prey spectrum included at least 109 species in 94 genera in 26 of 37 identified families representing 11 arthropod orders. The most common prey were adult flies of Nematocera, particularly Ceratopogonidae (50%) and Chironomidae (42%). The following taxa were periodically abundant: Acarina, Diptera–Cecidomyiidae, Chloropidae, Sciaridae, Hemiptera nymphs and Thysanoptera–Thripidae. Flies (Diptera) were chief flower visitors (95%), dominated by Syrphidae (66%), Bombyliidae and Muscidae (10% each), Calliphoridae (7%), Tachinidae and Dolichopodidae (3% each). Additionally, visitors were a bee (Hymenoptera–Halictidae) and thrips (Thysanoptera–Thripidae). Four families were common to both guilds: Diptera–Dolichopodidae, Muscidae, Tachinidae; and Thysanoptera–Thripidae. However, direct comparisons of identified taxa within these families showed that overlap between flower visitors and prey occurred for Thrips sp. larvae alone, which comprised only 3% of all flower visitors and 0.5% of prey. Drosera anglica exploits distinct guilds of insects for pollinators and prey.

Keywords

Diptera Nematocera Droseraceae Flower visitors Oblong-leaved Sundew Syrphidae Thripidae 

Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Gillian L. Murza
    • 1
  • Joanne R. Heaver
    • 1
  • Arthur R. Davis
    • 1
  1. 1.Department of BiologyUniversity of SaskatchewanSaskatoonCanada

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