First records of aphid-pathogenic Entomophthorales in the sub-Antarctic archipelagos of Crozet and Kerguelen

  • Bernard Papierok Pasteur Institute, Paris
  • Charles-Antonine Dedryver Institute for Genetics, Environment and Plant Protection, French National Institute for Agricultural Research, Domaine de la Motte, Le Rheu
  • Maurice Hullé INRA - UMR IGEPP
Keywords: Natural enemies, introduced species, biological invasion, colonization, Zygomycetes, parasitism

Abstract

Since the 20th century, the sub-Antarctic islands have suffered an increasing number of biological invasions. Despite the large number of publications on this topic, there is a lack of knowledge on parasitism rates of invasive species and on the role of parasites and pathogens to regulate their populations. Six aphid species have been introduced in the archipelagos of Crozet (Île de la Possession, 46° 25’ S–51° 51’ E) and Kerguelen (49° 21’ S–70° 13’ E). Five of these species were found infected by entomopathogenic fungi of the order Entomophthorales. All these fungal species are cosmopolitan. Conidiobolus obscurus and Entomophthora planchoniana were the most frequently observed on Île de la Possession and in Archipel des Kerguelen, respectively. This is the first report of pathogenic fungi of aphids on the sub-Antarctic islands. We discuss these results in the light of our current knowledge of these insect pathogens. Their introduction by aphids surviving on plants during transportation is the most likely hypothesis to explain their presence on these remote islands.

Keywords: Natural enemies; introduced species; biological invasion; colonization; Zygomycetes; parasitism.

(Published: 8 July 2016)

Citation: Polar Research 2016, 35, 28765, http://dx.doi.org/10.3402/polar.v35.28765

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Published
2016-07-08
How to Cite
Papierok, B., Dedryver, C.-A., & Hullé, M. (2016). First records of aphid-pathogenic Entomophthorales in the sub-Antarctic archipelagos of Crozet and Kerguelen. Polar Research, 35. https://doi.org/10.3402/polar.v35.28765
Section
Research/review articles