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Arthropod-Plant Interactions

, Volume 13, Issue 5, pp 719–734 | Cite as

Impacts of alien invasive Parthenium hysterophorus on flower visitation by insects to co-flowering plants

  • Fredrick OjijaEmail author
  • Sarah E. J. Arnold
  • Anna C. Treydte
Original Paper

Abstract

The exotic invasive plant Parthenium hysterophorus is invading many tropical habitats. While much work has been done on its interactions with other native plants, little is known about its interaction with insect floral visitors and how it impacts pre-existing pollination networks when it invades a site. We carried out surveys on sites with and without P. hysterophorus (invaded and uninvaded, respectively) to investigate its impact on plant–pollinator interactions with two common indicator or target plants (Ocimum gratissimum and Ageratum conyzoides) in Tanzania. During multiple 15 min observation periods in quadrats, the number of arriving flower visitors, duration of visits and visitation rate were measured and compared between sites. Visitation networks of flower visitors were developed by observing flower visitor taxonomic groups and plants visited across both invasion categories. Parthenium hysterophorus was heavily visited by a diversity of flies as taxonomic groups. Indicator plants received fewer flower visitors overall in the invaded site, implying P. hysterophorus may be disrupting pollen flow. Foraging behaviour and flower visitation by Apis mellifera and flies on target plants were particularly negatively affected in the invaded quadrats. Flower visitation rate to target plants was significantly lower in invaded quadrats than in uninvaded quadrats. This study supports work in other parts of the world demonstrating that invasive species can strongly disrupt pollination networks. By attracting flower visitors that could otherwise serve as pollinators of native plant species, P. hysterophorus which is rapidly spreading in eastern African ecosystems could have complex deleterious effects on the wider ecosystem.

Keywords

Biodiversity Exotic species Insects Pollinators Africa Tanzania 

Notes

Acknowledgements

Much appreciation is expressed to Dr Bruno Nyundo and Mr Emmanuel Mboya for helping in identification of insects and plants, respectively, and Mr. Shabani Juma, Mr. Godson Mbise, Mr. Baraka Athuman, and Mr. Michael Joseph for facilitating field activities.

Funding

The study was financed by the World Bank through its African Centre of Excellence, “Centre for Research, agricultural Advancement, Teaching Excellence and Sustainability in Food and Nutritional Security (CREATES)”, in the School of Life Sciences and Bioengineering at the Nelson Mandela Institution of Science and Technology (NM - AIST) in Arusha, Tanzania. We also received research equipment from the Idea Wild Foundation in the USA.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Sustainable Agriculture, Biodiversity and Ecosystem Management, School of Life Sciences and Bio-EngineeringThe Nelson Mandela African Institution of Science and TechnologyArushaTanzania
  2. 2.Institute of Science and TechnologyMbeya University of Science and TechnologyMbeyaTanzania
  3. 3.Natural Resources InstituteUniversity of GreenwichChatham MaritimeUK
  4. 4.Hans Ruthenberg Institute, Agroecology in the Tropics and SubtropicsUniversity of HohenheimStuttgartGermany

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