Multiple Origins of the Common Chameleon in Southern Italy
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Herpetozoa 32: 11–19 (2019) DOI 10.3897/herpetozoa.32.e35611 Multiple origins of the common chameleon in southern Italy Roberto Basso1, Maria Luisa Vannuccini2, Luca Nerva3,4, Giuseppe Mazza5, Matteo Seno1, Emiliano Mori6 1 Museo Civico di Storia Naturale di Jesolo, Via Enzo Ferrari 3, 30016, Lido di Jesolo (Venezia), Italy 2 Dipartimento di Scienze Ambientali, Università degli Studi di Siena, Via P.A. Mattioli 4, 53100, Siena, Italy 3 CREA Research Centre for Viticulture and Enology, Via XXVIII Aprile 26, 31015, Conegliano Veneto (Treviso), Italy 4 Institute for Sustainable Plant Protection, Strada delle Cacce 73, 10135, Torino, Italy 5 CREA Research Centre for Plant Protection and Certification, Via Lanciola 12/A, 50125, Cascine del Riccio (Firenze), Italy 6 Dipartimento di Scienze della Vita, Università degli Studi di Siena, Via P.A. Mattioli 4, 53100, Siena, Italy http://zoobank.org/18928D5C-5BFA-4596-B80D-C66126121886 Corresponding author: Emiliano Mori ([email protected]) Academic editor: Günter Gollmann ♦ Received 7 February 2019 ♦ Accepted 30 March 2019 ♦ Published 13 May 2019 Abstract The common chameleon Chamaeleo chamaeleon is a Mediterranean lizard which has been introduced in many islands and its native origin in European countries is debated. Chameleons have been introduced in southern Italy, possibly from the Middle East and Tunisia. We conducted genetic analyses on mitochondrial DNA 16S gene on a larger sample. We observed a multiple origin for the Salento (Apulia, southern Italy) population, with individuals phylogenetically related to populations of North Africa and two areas in the Middle East. Some individuals may have been released before the 1950s and some others in the 1980s, improving the estab- lishment success of this species. Key Words 16S rRNA gene, Chamaeleo chamaeleon, Mediterranean countries, paleo-introduction, population origin Introduction 2018), which may help researchers to predict alien spe- cies’ spread and inform authorities how to prevent further Genetics can play a crucial role in describing biological invasions (Ciosi et al. 2010; Mazzamuto et al. 2016). invasions, which are one of the major threats to global Chameleons (Squamata, Chamaeleonidae) include over biodiversity (Vitousek et al. 1996; Schmitz and Simber- 210 lizard species grouped in 12 genera (Tilbury 2018). loff 1997; Courchamp et al. 2017; Crooks et al. 2017). Among those, the genus Chamaeleo is the only one natu- Accordingly, genetic variation can reveal taxonomic dif- rally present in Mediterranean countries, North Africa and ferences (Panzeri et al. 2014; Comtet et al. 2015; Mori et the Middle East (www.iucnredlist.org. Downloaded on 29 al. 2017; for a review, see Lawson Handley et al. 2011). April 2018). Traditional taxonomy identified four subspe- A high genetic variability of the founders often results in cies of the common chameleon Chamaeleo chamaeleon a high colonization/invasion success (Mori et al. 2014; (Yaacov et al. 2012; Andreone et al. 2016; Tilbury 2018), Jackson et al. 2015; Paulauskas et al. 2016). Genetics has which live in allopatry in its natural range. As to Europe, been widely used to infer source populations and invasion populations in the Iberian Peninsula seem to have been in- paths (Stevenson-Holt and Sinclair 2015; Daane et al. troduced from Maghreb, with multiple introduction events Copyright Roberto Basso et al. This is an open access article distributed under the terms of the Creative Commons Attribution Li- cense (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 12 Roberto Basso et al.: Origins of chameleons in southern Italy (Paulo et al. 2002). Common chameleons currently pres- Molecular analyses ent in Cyprus and in Greek islands (e.g. Samos, Chios and Crete) share mitochondrial haplotypes with the Turkish We extracted the DNA from tissue samples (i.e. tongue) population (Macey et al. 2008; Andreone et al. 2016). At of 18 museum specimens of the common chameleon col- least two subspecies of the common chameleon have been lected by one of the authors (RB) between 1951 and 2017 introduced to Malta (Dimaki et al. 2008; Andreone et al. (Appendix 1) from throughout the Salento peninsula, and 2016), one from Maghreb and the other from the Near East. stored in 95% ethanol at the Museo Civico di Storia Natu- As for southern Italy, chameleons in Calabria (province of rale di Jesolo (province of Venice, NE Italy). Individuals Reggio Calabria) were possibly introduced from Tunisia stored at the museum were found dead on paved road, (Andreone et al. 2016). Conversely, Andreone et al. (2016) road killed or preyed upon by domestic cats. Moreover, showed that the population of the common chameleon in three of these samples belong to chameleons most likely Salento (Apulia) may originate from the Middle East, shar- poisoned by pesticides in olive groves (RB, unpublished). ing mitochondrial sequences with Eastern Mediterranean We used the PureLink DNA Mini Kit (Invitrogen, by countries (northern Israel). In southern Italy, long-lasting Thermo Fisher Scientific) and we followed the manufac- observational data and records of young individuals pro- turer’s instructions. The reliability of DNA extraction was vide strong evidence of reproduction and naturalization controlled through a negative control (no tissue added) (Marzano and Scarafino 2010; Pellegrino et al. 2016). Oth- and the DNA content determined through an Eppendorf er observations from the rest of Italy (Sicily, Sardinia, La- Ultraviolet Spectrophotometer (AG Eppendorf). Mito- tium, Liguria, Emilia Romagna and Friuli Venezia-Giulia) chondrial DNA (mtDNA) genes, and particularly the 16 refer to single individuals (Bruno 1986; Andreone et al. Svedberg rRNA gene (hereafter, 16S), show significant 2016) and, for most of them, no photos or tissue samples divergence among the four taxonomical subspecies of the or museum specimens exist (Andreone et al. 2016). common chameleon (Yaacov et al. 2012; Andreone et al. Andreone et al. (2016) analyzed three individuals 2016), thus allowing researchers to infer the geographical from Salento, collected in the same year (2015), from origin of populations of this species. the same study site (i.e., Nardò). According to published We used species-specific primers to sequence a frag- works, the first record of the common chameleon in ment of the mtDNA 16S gene, specifically designed on a Salento in the wild dates back to 1987 and, since then, consensus sequence using all the 16S sequences already records have increased (Basso and Calasso 1991; Marza- present on GenBank, to increase the amplification suc- no and Scarafino 2010). Andreone et al. (2016) and Mar- cess of our samples. We used the primers CAM-16S1 (5’- zano and Scarafino (2010) confirmed that most records CCT GCC CTG TGG AAC CCT A-3’) and CAM-16S2 came from the municipality of Nardò. Given that both (5’-GTT AGT CGT TGA ACA AAC GAA CCG-3’), Costa (1871) and Bruno (1986) did not report the pres- specifically designed for this work. Retrieved sequences ence of the chameleon in Salento, Andreone et al. (2016) were aligned using MUSCLE (Edgar 2004). Conserved claimed that the presence of the chameleon in this area regions at both ends were used to design custom prim- might be the result of a recent introduction (e.g. early ers (Bio-Fab Research – Rome, Italy) with high melting 1980s: see Scalera 2001). Conversely, Basso and Calas- temperature (above 60 °C) following Nerva et al. (2016). so (1991) already reported that the distribution of this PCR reactions were run through a 2720 Thermal Cy- small lizard could be even wider and possibly date back cler (Applied Biosystems), following this profile: 3 min prior to 1980. In this work, we aimed at (i) mapping the 94 °C, 30 cycles of 35 s at 94 °C, 45 s at 62 °C and 3 min local distribution of the common chameleon in Salento at 72 °C, followed by 7 min at 72 °C. PCR reactions were which underwent a range expansion, (ii) to identify the prepared following Mori et al. (2018), and using about subspecies and (iii) to infer the origin of common cha- 35 ng/ml of each DNA template. The electrophoresis was meleon established in this area. run for 45 min. on a 1.5% agarose gel. Pairwise alignments of 16S sequences were performed using ClustalW (Higgins and Sharp 1988). The best fitting Materials and methods evolutionary model for further phylogenetic analysis was selected using the algorithm implemented in MEGA7 (Ku- mar et al. 2016). Tamura-Nei model with Invariant sites Redefinition of the distribution of the (TN93+I) resulted in the best model for the considered data. common chameleon in Salento Evolutionary relationships were inferred with MEGA7 (Kumar et al. 2016), using the Neighbor-Joining and the We collected all the available information on the presence Maximum Likelihood (1000 bootstrap replicates) methods of the common chameleon through field investigations, based on the Tamura-Nei model (Tamura and Nei 1993). involving local rangers and human populations, as well We retrieved another 34 sequences of 16S rRNA gene as searching for grey literature, photos and other un- of the common chameleon from GenBank (Table S2 in equivocal presence signs of the common chameleon (e.g. Appendix 1), which were used to compare ours. Subspe- individuals illegally collected by agricultural pruners of cies distribution was drawn by using our sequences (N = olive-trees) in Salento. 18) and those reported in the phylogenetic tree by Andre- herpetozoa.pensoft.net Herpetozoa 32: 11–19 (2019) 13 one et al. (2016) (N = 34 from throughout the known ex- tent of occurrence of this species). The veiled chameleon Chamaeleon calyptratus was used as the outgroup. Results Distribution of the common chameleon in Salento (Apulia) Local interviews and field-searches revealed that the current distribution of the common chameleon in Salen- to (Apulia) ranges between the municipalities of Nardò and Castrignano del Capo (Fig.