Pollinator networks, alien species and the conservation of rare plants: Trinia glauca as a case study

1. Despite the essential role of pollination in the maintenance of many rare plant species, conservation management plans rarely consider the service of pollination. 2. This study identifies the main pollinators of a rare English plant species, Trinia glauca (Apiaceae), and provides recommendations...

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Bibliographic Details
Published in:	The Journal of applied ecology Vol. 45; no. 5; pp. 1419 - 1427
Main Authors:	Carvalheiro, L. G., Barbosa, E. R. M., Memmott, J.
Format:	Journal Article
Language:	English
Published:	Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01-10-2008 Blackwell Publishing Blackwell Publishing Ltd Blackwell Science
Subjects:	alien plants Animal, plant and microbial ecology Ants Applied ecology Biological and medical sciences complexity consequences conservation of rare plants Cotoneaster horizontalis Diet field experimentation Flowers Flowers & plants food web as a predictive tool food webs Formicidae fragmentation Fundamental and applied biological sciences. Psychology General aspects genetic-structure Habitat Suitability Habitats Insect pollination Introduced plants network Plant reproduction plant-insect relations Plants Pollen Pollinating insects Pollination pollination by ants population rare plant rare plants robustness Studies system Trinia glauca Wildlife management England Introduced species Formicidae Insecta Conservation pollination by ants Social insect Formicoidea food web as a predictive tool Pollination network Case study alien plants Pollinator Food web Arthropoda rare plant conservation of rare plants Hymenoptera Invertebrata Plant introduction Aculeata Trinia glauca
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Summary:	1. Despite the essential role of pollination in the maintenance of many rare plant species, conservation management plans rarely consider the service of pollination. 2. This study identifies the main pollinators of a rare English plant species, Trinia glauca (Apiaceae), and provides recommendations for its conservation. A community-level approach is used, whereby a visitation network is constructed to identify the direct and indirect links between T. glauca and other members of the plant-visitor community. 3. A field experiment that excluded the main visitor species from female T. glauca showed that ants were the main pollinators of T. glauca. The network revealed that over the field season, 33% of the ants' visits to flowers were to alien plants, with Cotoneaster horizontalis making a particularly high contribution (58%) during the T. glauca flowering period. 4. The removal of alien plants is a part of the conservation management of T. glauca, and we simulated the likely consequences of this form of habitat management on T. glauca pollination, any effects being mediated by shared pollinators. Although positive or neutral effects are possible, a negative effect is also possible, whereby the removal of alien plants leads to a crash in ant populations, potentially reducing pollinator visits to T. glauca by up to 85·2%. 5. Synthesis and applications. Conserving the pollinators of rare plants is essential if their conservation is to be sustainable in the long term. Our data indicate that T. glauca is pollinated by ants and demonstrate that ants can also feed on alien plants, particularly during the flowering season of this rare plant. We suggest that management measures involving the removal of alien plants should consider the possible negative impacts on rare plants through changes in pollinator populations. In this case, a staged removal is likely to prove the best conservation approach, allowing the pollinators' response to be assessed before any serious negative effects occur.
Bibliography:	http://dx.doi.org/10.1111/j.1365-2664.2008.01518.x
ISSN:	0021-8901 1365-2664
DOI:	10.1111/j.1365-2664.2008.01518.x