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Genetic Variation in Pleurodeles Wähl MICHAHELLES, 1830 Across The ©Österreichische Gesellschaft für Herpetologie e.V., Wien, Austria, download unter www.biologiezentrum.at 166 SHORT NOTE HERPETOZOA 16 (3/4) Wien, 30. Jänner 2004 SHORT NOTE the fact that the female was kept together dried up during the Messinian salinity crisis with three males. Table 1 summarizes the di- some 5.6 Mya (Hsü et al. 1977) - separating mensions of the eggs which fall within the the terrestrial fauna into allopatric units. range reported by BUSKIRK et al. (2001) for T. Variation in levels of genetic differentiation graeca. The eggs are nearly spherical, slightly estimated using protein electrophoretic data, depressed and bear now the collection num- however, implied that not all herpetofauna bers MTD 45262-45274. were equally affected by this event (BUSACK It is unknown whether captive condi- 1986), as some species showed evidence of tions influence clutch size in Testudo. gene flow after the opening of the Strait. However, it has to be pointed out that the For the wall lizards of the Podarcis hispani- reported record clutch might be the result of ca (STEINDACHNER, 1870) species complex, an optimal maintenance. for example, the opening of the Strait of REFERENCES: BUSKIRK, J. R. & KELLER, C. & Gibraltar was not directly related to genetic ANDREU, A. C. (2001): Testudo graeca (LINNAEUS, divergences between Iberian and Moroccan 1758) - Maurische Landschildkröte; pp. 125-178. In: populations (HARRIS et al. 2002), while it FRITZ, U. (Ed.): Handbuch der Reptilien und Amphibien may have been for Acanthodactylus erythru- Europas; Vol III/3A, Schildkröten I; Wiebeisheim (Aula Verlag). HERZ, M. (1999): Erfolgreiche Nachzucht von rus (SCHINZ, 1833) (HARRIS et al. 2004). Testudo graeca anamurensis WEISSINGER, 1987.- Sauria, Our aim was to examine the genetic Berlin, 21 (2): 3-8. HIGHFIELD, A. C. (1990): Keeping and breeding tortoises in captivity. Taunton, Somerset diversity within part of the 12S rRNA (R & A), pp. 149. HIGHFIELD, A. C. (1996): Practical mtDNA gene of Spanish Ribbed Newts, encyclopedia of keeping and breeding tortoises and Pleurodeles waltl MICHAHELLES, 1830, freshwater turtles. London (Carapace Press), pp. 295. across the Strait of Gibraltar and compare LAPID, R. & ROBINZON, B. (2002): Methodologies for estimation of reproductive state in testudos: studies in this with published data from other species. captive Testudo graeca terrestris in Israel.- Chelonii, We compared a molecular clock previously Gonfaron; 3: 251-256. PERÄLÄ, J. (2002a): The genus applied to Pleurodeles and Euproctus (CAC- Testudo (Testudines: Testudinidae): phylogenetic infer- CONE et al. 1994), in order to try to assess ences.- Chelonii, Gonfaron; 3: 32-39. PERÄLÄ, J. (2002b): Morphological variation among Middle how long the populations have been separat- Eastern Testudo graeca L., 1758 (sensu lato), with a ed, and if divergences were concordant with focus on taxonomy.- Chelonii, Gonfaron; 3: 78-108. the opening of the Strait. Finally, we also PIEH, A. (2002): Remarks on the geographic and evolu- compared our results to two recent studies of tionary variability of the spur-thighed tortoise {Testudo (CARRANZA graeca) in Northern Africa.- Chelonii, Gonfaron; 3: Pleurodeles phylogeography & 109-116. PIEH, A. & TASKAVAK, E. & REIMANN, M. ARNOLD 2004; VEITH et al. 2004) to more (2002): Remarks on the variability of spur-thighed tor- precisely assess the distribution of genetic toise (Testudo graeca) in Turkey.- Chelonii, Gonfaron; variation across the species range. 3: 67-71. RUDLOFF, H.-W. (1990): Schildkröten. Leip- zig, Jena, Berlin (Urania), pp. 155. Genomic DNA was extracted follow- ing standard high-salt protocols. The 12S KEY WORDS: Reptilia: Testudines: Testudo graeca ibera, clutch size, Turkey fragment was amplified by PCR using the primers published in KOCHER et al. (1989) SUBMITTED: July 1, 2003 and conditions described in HARRIS (2001). AUTHOR: Dr. Uwe FRITZ, Museum für Tier- Sampling localities are given in table 1. The kunde Dresden, Staatliche Naturhistorische Sammlun- gen, Königsbrücker Landstraße 159, D-01109 Dresden, amplified products were sequenced on an FR Germany automated sequencer (ABI 310). New se- quences were deposited on Genbank, acces- sion numbers AY522558 to AY522566. Genetic variation in Pleurodeles Sequences were aligned against one previ- wähl MICHAHELLES, 1830 across the ously published P. waltl (CACCONE et al. Strait of Gibraltar derived from 1994). In total ten sequences of 374 base mitochondrial DNA sequences pairs were included. Alignment was facile, as only one single base pair insertion was The Strait of Gibraltar is known as a needed. Including the indel, six sites were natural barrier to gene flow for many parsimoniously informative. There was no amphibian and reptile species. Around 5.3 - homoplasy, so the sequences were joined 5.5 My a, water from the Atlantic Ocean into a median network (BANDELT et al. filled the Mediterranean basin - which had 2000). The previously published sequence ©Österreichische Gesellschaft für Herpetologie e.V., Wien, Austria, download unter www.biologiezentrum.at SHORT NOTE HERPETOZOA 16 (3/4) Wien, 30. Jänner 2004 SHORT NOTE 167 of unknown locality (CACCONE et al. 1994) Table 1: Specimens of Pleurodeles waltl MICHA- is identical to two of our sequences from HELLES, 1830, sequenced for this analysis with locality and specimen code number. A photo of the specimens individuals from Morocco. Pwl and Pw2 is provided in CARRETERO et al. (2004). According to our results, two distinct groups of haplotypes can be identified, Code Locality shown in fig. 1. One group is made up of Pwl Al-Jadida, Morocco specimens of P. waltl from Portugal and Pw2 Al-Jadida, Morocco Spain, and the second one includes the Pw3 Al-Jadida, Morocco Moroccan samples and one individual from Pw4 Torreira, Portugal Pw5 Torreira, Portugal Cadiz. The level of genetic variation be- Pw6 Sagres, Portugal tween these two groups is approximately Pw7 Sagres, Portugal 1.1 %. If we use the evolution rate proposed Pw8 Badajoz, Spain by CACCONE et al. (1994), this level of diver- Pw9 Cadiz, Spain gence implies a separation of approximately 3.5 My, which is after the formation of the Strait of Gibraltar and similar to 3.2 My esti- To conclude, our results suggest that mated by CARRANZA & ARNOLD (2004). there are two genetically distinct groups After the Strait opened, the Cadiz region was within P. waltl, but that these are not sepa- an island and remained separated from the rated by the Strait of Gibraltar. By combin- rest of the Iberian Peninsula by the Gua- ing our data with that from two recent stud- dalquivir Rift for some million years (JONG ies (fig. 2) it seems that the Guadalquivir 1998). Pleurodeles in this region of South- river approximately separates the two West Iberia are apparently genetically more groups, although detailed sampling in this closely related to North African populations area is still needed. A similar distribution than to Iberian populations. The same is also pattern is seen in Discoglossus (GARCIA- observed in Podarcis lizards (HARRIS et al. PARIS & JOCKUSCH 1999). Our results fur- 2002), but levels of genetic divergence ther highlight the diverse phylogenetic pat- between the two clades are higher in terns of herpetofauna observed from this Podarcis. The existence of multiple haplo- geologically complex region. types in Morocco, and its wide distribution, ACKNOWLEDGEMENTS: This project was argues against an anthropogenic introduc- supported by grants from Fundaçào para a Ciência e tion as suggested by CARRANZA & ARNOLD Tecnologia POCTI/41912/BSE/2001 and SFRH/BPD/ 5702/2001 (to DJH). Thanks to C. PINHO (CIBIO/UP) (2004), but rather natural colonization in an and A. PERERA (University of Salamanca) for participa- extremely recent evolutionary time frame. tion during fieldwork in North Africa. Morocco Iberian Peninsula & South Iberian Peninsula H—I Y C/I T/C A/G C/T Fig. 1 : Network showing relationship between Pleurodeles waltl sequences. * indicates the previously published sequence (CACCONE et al. 1994). All inferred mutations are shown. ©Österreichische Gesellschaft für Herpetologie e.V., Wien, Austria, download unter www.biologiezentrum.at 168 SHORT NOTE HERPETOZOA 16 (3/4) Wien, 30. Jänner 2004 SHORT NOTE Pw1,2, Fig. 2: Distribution of Pleurodeles wähl MICHAHELLES, 1830 (grey shaded area) and sampling localities (from this study, CARRANZA & ARNOLD 2004, VEITH et al. 2004). Filled symbols represent one genetic clade relative to the other (unfilled symbols). The Guadalquivir river is shown, and approximately separates the two clades. REFERENCES: BANDELT, H. J. & MACAUI.AY, genetic diversity within Acanthodactylus erythrurus V. & RICHARDS, M B. (2000): Median networks: (Reptilia: Lacertidae) in Morocco and the Iberian speedy construction and greedy reduction, one simula- Peninsula using mitochondrial DNA sequence data.- tion and two case studies from human mtDNA.- Mol. Amphibia-Reptilia, Leiden; 25 (2). Hsu, K. J. & Phylogenet. Evol., Chicago; 16: 8-28. BUSACK, S. D. MONTADERT, L. & BERNOULLI, D. & BIANCA ClTA, M. & (1986): Biogeographic analysis of the herpetofauna ERICKSON, A. & GARRISON, R.E. & KIDD, R.B. & separated by the formation of the Strait of Gibraltar- MÈLIÉRES, F. & MÜLLER, C. & WRIGHT, R. (1977): National Geographic Research, Washington; 2: 17-36. History of the Mediterranean salinity crisis.- Nature, CACCONE, A. & MILINKOVITCH, M. C. & SBORDONI, V. London; 267: 399-403. JONG, H. DE (1998): In search & POWELL, J. R. (1994): Molecular biogeography: of historical biogeographic
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