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Wolbachia Infection and Parasitoid Occurrence Among Plant © Entomologica Fennica. 23 April 2019 Wolbachia infection and parasitoid occurrence among plant-feeding caterpillars of the endangered butterfly Phengaris teleius (Lepidoptera: Lycaenidae) in southern Poland Ewa B. liwiñska, Rafa³ Martyka, Mariusz Cichoñ & Piotr Tryjanowski liwiñska, E. B., Martyka, R., Cichoñ, M. & Tryjanowski, P. 2019: Wolbachia infection and parasitoid occurrence among plant-feeding caterpillars of the en- dangered butterfly Phengaris teleius (Lepidoptera: Lycaenidae) in southern Po- land. Entomol. Fennica 30: 2027. https://doi.org/10.33338/ef.79902 Parasites are an important component ofecological communities, as they shape host population dynamics and interfere with interspecific competition in ecosys- tems. Here, we studied Wolbachia infection and parasitoid occurrence among caterpillars ofthe endangered Phengaris teleius butterfly in five populations in- habiting southern Poland. The knowledge about potential parasites of P. teleius may be of particular importance for understanding forces regulating population processes ofthis species. Our study showed lack of Wolbachia infection and endoparasitoids in the sample of91 4 th instar P. teleius caterpillars. However, we found larvae of an unidentified hymenopteran ectoparasitoid on 17 3rd and 4th instar P. teleius caterpillars. We compare our results to findings from other popu- lations of P. teleius, and its sister species in Europe and Asia, and discuss possible causes ofobserved patterns ofparasite occurrence. E. B. liwiñska & R. Martyka, Institute of Nature Conservation, Polish Academy of Sciences, Mickiewicza 33, 31120 Kraków, Poland; E-mails: sliwinska @iop.krakow.pl, [email protected] M. Cichoñ, Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30387 Kraków, Poland; E-mail: [email protected] P. Tryjanowski, Institute of Zoology, Poznañ University of Life Sciences, Wojska Polskiego 71C, 60625 Poznañ, Poland; E-mail: [email protected] Received 16 October 2017, accepted 14 May 2018 1. Introduction induce feminization of genetic males, kill the male progeny of infected females and cause cyto- Wolbachia (Hertig & Wolbach, 1924) (Rickettsi- plasmic incompatibility (i.e. inability ofinfected ales: Rickettsiaceae) is a bacterial parasite ofin - males to successfully mate with females lacking vertebrate animals that causes several problems, the same Wolbachia strain; Werren et al. 2008). particularly in the conservation management of Typically, Wolbachia spreads vertically in popu- Lepidoptera (Hamm et al. 2014). Wolbachia is an lations and is inherited maternally due to its pres- intracellular a-proteobacterium that has the abil- ence in the cytoplasm offemale gametes (Werren ity to manipulate the biology ofits invertebrate et al. 2008). The presence of Wolbachia may de- hosts. In Lepidoptera, Wolbachia infection may crease the effective population size of Lepidop- ENTOMOL. FENNICA Vol. 30 Wolbachia and parasitoids in a lycaenid 21 Fig. 1. Map of the study area with locations of the sampled Phengaris teleius populations (black dots). Localities: 1 Kraków-Kostrze, 2 Barczków, 3 Ja- downiki Mokre, 4 ¯u- kowice Stare, 5 Zaczarnie. tera and therefore poses a serious risk for threat- & Dobson 1995, Shaw & Hochberg 2002, Hamm ened butterfly species (Hamm et al. 2014). et al. 2014). Parasitoid wasps (from the suborder Apo- crita) are an example ofparasites specialized in utilizing different arthropod species, including 2. Materials and methods butterflies (Hinz 1983, Goulet & Huber 1993, Quicke 1997). Adult parasitoids attack Lepidop- 2.1. Study species, site tera as eggs, larvae or pupae, laying their eggs in- and general procedures side the insects (endoparasitoids) or on their cuticulae (ectoparasitoids). Parasitoids can be The P. teleius butterfly is characterized by a com- used in pest control (e.g. van Lenteren & Woets plicated life cycle. Its caterpillar is a mono- 1988, van Lenteren 2000), but may negatively in- phagous herbivore that feeds exclusively on the fluence endangered populations of their hosts, as great burnet Sanguisorba officinalis L. As a 1st to even a few dozen parasitoid species may attack 3rd instar caterpillar, it feeds inside a single flower the same host species (Godfray & Charles 1994). bud until leaving the plant (Thomas 1984). 4th In this study, we assessed the occurrence of instar larvae drop to the ground, remaining there Wolbachia infection among caterpillars of the to wait for foraging Myrmica Latreille, 1804 ants. scarce large blue butterfly Phengaris teleius Ifforagingworker ants come across such a cater - (Bergsträsser, 1779), originating from popula- pillar, they take it to their ant colony in a process tions located in southern Poland. In the course of called adoption (Thomas 1984). The predatory P. sampling, we also recorded the presence ofpara - teleius caterpillar then spends 11 or 23 months in sitoid larvae on P. teleius caterpillars. Phenagris the Myrmica nest, feeding on the ant brood teleius is a threatened butterfly (van Swaay & (Thomas 1995, Witek et al. 2006). It pupates in Warren 1999, van Swaay et al. 2012) that is con- late spring/early summer and leaves the colony as sidered to be a flagship species for nature conser- an adult butterfly between June and August vation in Europe (Thomas 1995, Thomas & (Thomas 1995, Witek et al. 2006). Settele 2004). We searched for Wolbachia infection and re- Identifying the potential parasites of P. teleius corded parasitoid presence among caterpillars may be important for understanding population originating from five separate P. teleius popula- processes in this species (Dobson & Hudson tions in the western part ofthe Sandomierz Basin, 1986), with potential significance for conserva- southern Poland, in the years 20132014 (Fig. 1). tion management ofthe butterfly(e.g. McCallum In both seasons, the study was conducted in Au- 22 liwiñska et al. ENTOMOL. FENNICA Vol. 30 Table 1. Data gathered from five populations during two years of study, including number of inspected food plants, total number of caterpillars and number of caterpillars with ectoparasitoid larvae. No. of caterpillars Year Population No. of plants collected with ecto- inspected parasitoid larva 2013 Barczków 60 56 3 Jadowniki Mokre 80 118 3 ¯ukowice Stare 30 102 9 2014 Barczków 60 194 1 Jadowniki Mokre 40 104 0 ¯ukowice Stare 26 60 0 Zaczarnie 22 26 0 Kraków-Kostrze 43 118 1 gust when caterpillars, in their 4th larval instar, are ment using PCR protocols available in Patricelli most likely to be found on food plants. In each po- et al. (2013) and W-Specfand W-Specr primers pulation, we randomly gathered a set offood from Werren and Windsor (2000). Additionally, plants that were later inspected under laboratory we used universal arthropod primers for 28S conditions to find P. teleius caterpillars. rDNA (as in Nice et al. 2009) to verify the nega- After detecting a caterpillar, we confirmed its tive results ofthe 16S rDNA Wolbachia PCR. species and determined its larval instar, based on For each sample, one or two PCRs were then per- the identification table in liwiñska et al. (2006), formed. First, all samples were screened for using a Nikon microscope SMZ 1500 (magnifi- Wolbachia (16S rDNA PCR) and afterwards, the cation 1020×). In total, we found and investi- samples with a negative result were analysed for gated 778 P. teleius caterpillars at different larval arthropod 28S rDNA to check for overall PCR instars, from 361 food plant stems (for details see quality. In cases where the quality of28S rDNA Table 1). Afterwards, to kill and preserve the cat- PCR was poor, the DNA sample was sequentially erpillars, they were submerged in a solution of diluted, following Nice et al. (2009), and RNA Later (20 mM sodium citrate, 10 mM Wolbachia PCR was performed again to confirm EDTA, 70% ammonium sulphate, pH 5.2; RNA the negative result. DNA isolation was performed Later solution also stabilizes DNA) and frozen at as follows. A whole caterpillar body was macer- 30 °C until further examination. ated in 50 µl of TE buffer, and 1 µl of Proteinase To determine the presence of Wolbachia in- K (Thermo Scientific, 1422 mg/ml) was added. fection, we examined 4th instar caterpillars (91 The mixture was then placed in a thermoblock for caterpillars in total). As Wolbachia was not de- 2hat56EC. After protein digestion, 100 µl of 5% tected in 4th instar caterpillars (see below), we did CHELEX (chelating material, BioRad) solution not find it necessary to include younger larvae in was added and the mixture was intensively our sample. vortexed for 1 min. After that, the mixture was placed in a thermoblock at 95 EC with an inten- sive shake (1,400 rpm) for 10 min and then centri- 2.2. Molecular determination fuged at 13,000 rpm for 10 min. The supernatant of Wolbachia infection with purified DNA was taken to the PCR cham- ber. PCR was performed in a SensoQuest To test for Wolbachia infection in P. teleius cater- Labcycler. The PCR products were visualized on pillars, we performed PCR of the 16S rDNA frag- 1% agarose gels. ENTOMOL. FENNICA Vol. 30 Wolbachia and parasitoids in a lycaenid 23 2.3. Inspection for parasitoids nating from five studied populations, located in the western part ofthe Sandomierz Basin, in At the moment of extraction from inflorescences, southern Poland. The lack of Wolbachia infection each caterpillar, from 1st to 4th instars, was in- was confirmed by the most appropriate and sensi- spected for ectoparasitoid larvae feeding on the tive available molecular methods. Therefore, we surface of their bodies. Furthermore, all 4th instar are confident in our results. Interestingly, Ritter et P. teleius caterpillars were checked for the pres- al. (2013) analysed P. teleius individuals from ence ofendoparasitoid larvae. We examined only four populations in Poland Wólka near War- 4th instar caterpillars, as visual detection ofyoun - saw, Kosyñ near W³odawa, Wiesió³ka near Za- ger endoparasitoids is unreliable in P. teleius wiercie and Widacz near Krosno. However, all (Anton et al. 2007b, Anton, personal inform.). individuals from these populations were also free Thus, each 4th instar caterpillar was dissected, af- from Wolbachia infection.
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