Abstract Detail



Ecology

Morgan, Eric [1].

Influence of a non-native orchid, Epipactis helleborine (L.) Crantz, upon the distribution, life cycle and feeding patterns of a native weevil, Stethobaris ovata (LeConte) (Curculionidae) and evidence of apparent .

With the introduction of non-native species to new environments the impact of a particular species introduction can often go unrecognized for extended periods of time.  Throughout the northeastern North America, Epipactis helleborine, a non-native terrestrial orchid introduced over a century ago, has begun to disrupt the regular feeding pattern of a native Baridinae weevil, Stethobaris ovata (Curculionidae). We present evidence that S. ovata, a specialist feeder upon members of the Orchidaceae will preferentially feed upon Epipactis helleborine when available. Furthermore, we show that populations of S. ovata are showing phenological shifts in the presence of E. helleborine. Additionally, populations of S. ovata are under disruptive selection pressure, with populations around E. helleborine showing a decreased response to native Orchidaceae as a food source, and decreased feeding when compared to feeding upon E. helleborine. These results are suggestive of the evolution of incipient species within S. ovata as currently circumscribed. To demonstrate the potential impacts upon the native orchid flora, we present data from a metapopulation analysis of variable patch sizes of both native orchids as well as E. helleborine, showing that the presence of E. helleborine increases patch suitability for colonization by S. ovata.


1 - 2350 Broadhollow Rd, Department Of Biology - Hale Hall, Farmingdale , NY, 11375, United States

Keywords:
invasive plants
incipient
Orchidaceae
insects.

Presentation Type: Oral Paper
Number:
Abstract ID:940
Candidate for Awards:None


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