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First Records of Aphid-Pathogenic Entomophthorales in the Sub RESEARCH/REVIEW ARTICLE First records of aphid-pathogenic Entomophthorales in the sub-Antarctic archipelagos of Crozet and Kerguelen Bernard Papierok,1 Charles-Antoine Dedryver2 & Maurice Hulle´ 2 1 Pasteur Institute, 25 et 28, rue du Docteur Roux, FR-75015 Paris, France 2 Institute for Genetics, Environment and Plant Protection, French National Institute for Agricultural Research, Domaine de la Motte, FR-35653 Le Rheu, France Keywords Abstract Natural enemies; introduced species; biological invasion; colonization; Since the 20th century, the sub-Antarctic islands have suffered an increasing Zygomycetes; parasitism. 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 Correspondence and on the role of parasites and pathogens to regulate their populations. Maurice Hulle´ , Institute for Genetics, Six aphid species have been introduced in the archipelagos of Crozet (Iˆle de la Environment and Plant Protection, French Possession, 468 25’ SÁ518 51’ E) and Kerguelen (498 21’ SÁ708 13’ E). Five of National Institute for Agricultural Research, these species were found infected by entomopathogenic fungi of the order Domaine de la Motte, FR-35653 Le Rheu, Entomophthorales. All these fungal species are cosmopolitan. France. E-mail: [email protected] Conidiobolus obscurus and Entomophthora planchoniana were the most frequently observed on Iˆle 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. As insular ecosystems in isolated and severe climatic 2004; Liu & Stiling 2006)*but also by their own bio- environments, the sub-Antarctic archipelagos of Crozet logical traits, such as dispersal, fitness and so on (Hayes & and Kerguelen provide a unique field to address ques- Barry 2008). However, there is a lack of knowledge about tions regarding invasive species in relation to increasing parasitism rates of invasive species and the role of para- human impact and climate change (Gaston et al. 2002; sites and pathogens in regulating their populations (Torchin Chown et al. 2005; Frenot et al. 2005; Chown et al. et al. 2003; Prenter et al. 2004; Dunn et al. 2012). 2008). These remote islands have a cold oceanic climate Six species of aphids (Hemiptera, Aphididae) are known and a depauperate native fauna and flora. Whalers and to occur on Iˆle de la Possession and in Archipel des sealers were the main visitors during the 19th century Kerguelen (Remaudie`re & Etienne 1988; Hulle´, Pannetier, and may be responsible for the first biological introductions. Maurice et al. 2003): Aulacorthum solani (Kaltenbach), Kerguelen was increasingly visited from the beginning of Macrosiphum euphorbiae (Thomas), Myzus ascalonicus Don- the 20th century, whereas for Iˆle de la Possession, in the caster, Myzus ornatus Laing, Myzus persicae (Sulzer) and Archipel Crozet, the increase in visits began in the mid- Rhopalosiphum padi (L.). These species are cosmopolitan 20th century (Frenot et al. 2001; Lebouvier & Frenot and are understood to have been introduced within the 2007). As sub-Antarctic islands, their food webs are poorly last 80 years (Hulle´, Pannetier, Simon et al. 2003). Myzus developed, with a high number of decomposers and very ascalonicus is the most invasive (Hulle´, Pannetier, Simon few herbivores, predators and parasites (Crafford et al. et al. 2003; Hulle´ 2012). This generalist feeder has 1986; Chown et al. 1998; Vernon et al. 1998; Convey colonized both introduced and native plants belonging 2001). The success of invasive species in their new habi- to 14 families, and has spread widely, preferentially along tats can be explained at least in part by reduced control the littoral zone and below 100 m above sea level (Hulle´, by natural enemies such as predators, pathogens and Pannetier, Simon et al. 2003). To understand major parasites*the enemy release hypothesis (Colautti et al. biological traits that influence colonization success by Polar Research 2016. # 2016 B. Papierok et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 1 International License (http://creativecommons.org/licenses/by-nc/4.0/), permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Citation: Polar Research 2016, 35, 28765, http://dx.doi.org/10.3402/polar.v35.28765 (page number not for citation purpose) Aphid-pathogenic Entomophthorales in the sub-Antarctic B. Papierok et al. these cosmopolitan and polyphagous aphids in such sub- Possession and varies from more than 3200 mm in the Antarctic environments, studies were carried out starting western part of Archipel des Kerguelen to less than 800 mm from the end of the 1990s. Host plant range, spatial and in the eastern part. altitudinal distribution of aphids, their genetic variability, Entomophthorales-killed aphids were searched for their role in the transmission of plant viruses and the during the austral growing seasons (DecemberÁMay) in vulnerability of native communities were especially in- 2001/02 (Iˆle de La Possession only) and 2011/12 and vestigated (Delmotte et al. 2001; Delmotte et al. 2003; 2012/13 (Iˆle de La Possession and Archipel des Kerguelen) Hulle´, Pannetier, Maurice et al. 2003; Hulle´, Pannetier, at locations routinely used for botanical and entomolo- Simon et al. 2003; Lebouvier et al. 2011; Hulle´ 2012; gical studies: Base Alfred Faure, Baie Ame´ricaine, Crique Svanella-Dumas et al. 2013). Aphids killed by fungi of du Sphinx, Crique de Noe¨l and Baie du La Pe´rouse on Iˆle the order Entomophthorales (Zygomycetes) sensu Keller de la Possession (Fig. 1); and Base de Port-aux-Franc¸ais, (2007) were first observed (by MH) in 2001 on Iˆle de la Iˆle Haute, Iˆle Mayes, Iˆle aux Cochons and Iˆle Verte in Possession and in Archipel des Kerguelen, although the Archipel des Kerguelen (Fig. 2). Such aphids can be presence of natural enemies was not mentioned in the recognized by their peculiar brownish colour and, some- literature. times, their fixation on the substrate through fungal The present contrizbution compiles observations of structures called rhizoı¨ds or a layer of sporulating struc- aphid-pathogenic fungi in Archipel des Kerguelen and tures covering the body. When cadavers were found in on Iˆle de la Possession and discusses these data in the aphid colonies, they were processed as follows to con- framework of our current knowledge on these insect firm the fungal nature of the infection and to identify pathogens and invasion biology. the etiological agent. Leaves bearing colonies were cut out and placed in containers not completely closed, to prevent the atmosphere from becoming saturated. Back Material and methods at the laboratory, leaves were observed with a binocular Archipel des Kerguelen (498 21’ SÁ708 13’ E, 7200 km2) microscope. Aphids killed by Entomophthorales were and Iˆle de La Possession (468 25’ SÁ518 51’ E, 150 km2) gently removed from the leaf using forceps, and placed in the Archipel Crozet are both in the sub-Antarctic area on a moistened piece of filter paper. That moistened piece of the Southern Indian Ocean. Their mean annual temp- was then attached to the inside of a Petri dish and the eratures are 4.858C (Me´te´o-France, 1951Á2014 records) lid was inverted on slides to collect conidia forcibly dis- and 5.528C (Me´te´o-France, 1970Á2014 records), respec- charged from cadavers. Following collection of conidia, tively; little seasonal variation is recorded. The major slides were kept in dry conditions and corresponding climatic difference between these two archipels is rain- cadavers stored in ethanol 70%. For observation of fall: the total annual rainfall is 2400 mm on Iˆle de la conidia, the slides were mounted in cotton blue in Ma: Myzus ascalonicus Rp: Rhopalosiphum padi As: Aulacorthum solani Baie Américaine Conidiobolus obscurus: Ma Crique du Sphinx Conidiobolus obscurus: Rp Île de la Pandora neoaphis: Rp Possession Zoophthora phalloides: Rp, Ma Base Alfred Faure Conidiobolus obscurus: Ma, As Conidiobolus coronatus: Ma Zoophthora phalloides: Ma Baie du La Pérouse Zoophthora sp: Ma Conidiobolus obscurus: Ma Crique de Noël Conidiobolus obscurus: Ma Fig. 1 Distribution of Entomophthorales on Iˆle de la Possession (Archipel Crozet). 2 Citation: Polar Research 2016, 35, 28765, http://dx.doi.org/10.3402/polar.v35.28765 (page number not for citation purpose) B. Papierok et al. Aphid-pathogenic Entomophthorales in the sub-Antarctic Île Haute Base de Port-aux-Français Entomophthora planchoniana: Ma Entomophthora planchoniana: Ma, Me Conidiobolus obscurus: Ma Conidiobolus obscurus: Ma Archipel des Kerguelen Île aux Cochons Entomophthora planchoniana: Ma Île Verte Entomophthora planchoniana: Ma Ma: Myzus ascalonicus Île Mayes Rp: Rhopalosiphum padi Conidiobolus obscurus: Rp Me: Macrosiphum euphorbiae Fig. 2 Distribution of Entomophthorales in Archipel des Kerguelen (Golfe du Morbihan). lactophenol. Shapes of spores were systematically noted, Six different Entomophthorales were distinguished from and the length and width of 10Á50 spores per cadaver dead aphids collected on Iˆle de La Possession, namely: were
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