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    Potential Distribution Modeling and Morphology of Pelias barani (B?hme and Joger, 1983) in Turkey

    2015-10-31 10:56:50Serkan
    Asian Herpetological Research 2015年3期

    Serkan GüL

    Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdo?an University, Rize 53100, Turkey

    Potential Distribution Modeling and Morphology of Pelias barani (B?hme and Joger, 1983) in Turkey

    Serkan GüL*

    Department of Biology, Faculty of Arts and Sciences, Recep Tayyip Erdo?an University, Rize 53100, Turkey

    The climatic p

    of Pelias barani, a rare Pontic endemic viper, are analysed and a new locality record is reported. According to species distribution modeling, with the average test AUC was was 0.904 ± 0.068, bioclimatic variables such as Precipitation of driest month (45.5%), Temperature seasonality (18.9%), Precipitation seasonality (17.9%) and Maximum temperature of warmest period (14.7%) appear to have the most useful information on geographic distribution of Pelias barani. Distribution models of Pelias barani under current climatic conditions showed better adaptation to the northwest and northeast part of Turkey.

    Climate, Maxent, New locality, Pelias barani, Rize, Turkey, Vipera

    1. Introduction

    The family Viperidae includes three subfamilies, thirtyeight genera (Pyron et al., 2013) and 328 species (from The Reptile Database 2014). The genus Vipera (Laurenti, 1768) includes 32 species inhabiting Asia Minor, Eurasia, Northern Africa and the Middle East (Ananjeva et al., 2006; from The Reptile Database 2014). Currently, 14-15 species belonging to the family Viperidae have been recognized in Turkey (Tuniyev et al, 2012, G??men et al., 2014). Taxonomically, the genus Pelias was recognized first as a subgenus of genus Vipera (Venchi and Sindaco, 2006), and many authors used “Pelias” as subgenus (Ananjeva et al., 2006; Venchi and Sindaco, 2006; Afsar and Afsar, 2009; Avc? et al., 2010), but later according to a catalogue of living and extinct species in recent years (Wallach et al., 2014), Pelias was recognized as a genus in the family Viperidae that includes P. altaica, P. anatolica, P. barani, P. berus, P. darevskii, P. dinniki, P. ebneri, P. eriwanensis, P. kaznakovi, P. lotievi, P. magnifica, P. nikolskii, P. olguni, P. orlovi, P. pontica, P. renardi, P. sachalinensis, P. seoanei, and P. ursinii species (Wallach et al., 2014). Accordingly, I use Peliasas genus in this study. Pelias barani (Baran’s Adder) is one of the Anatolian vipers with little information available about its biology (Kumluta? et al., 2012). P. barani was first described from its type locality in 60 km N of Adapazar? at 400 m a.s.l. (40°50' N, 30°25' E)in the northwestern Anatolia with a female specimen (B?hme and Joger, 1983). Later, new locality records were reported from the northwestern and the northeastern Anatolia (Baran et al., 1997; Franzen and Heckes, 2000; Baran et al., 2001; Avc? et al., 2004; Baran et al., 2005; Kumluta? et al., 2012) (Table 1). The taxonomic status of P. barani was evaluated with several studies in respect to phylogenetic data. Firstly, Joger et al. (1997) studied the phylogenetic position of P. barani and P. nikolskii within the P. berus complex using morphological and hemipenial comparisons, and a partial sequence of the mitochondrial cyt b gene. According to mitochondrial DNA information, they found that P. barani might be a subspecies of P. berus, but they showed that it was a different species using both morphological and hemipenial data. Later, Joger et al. (2003) identified five groups including P. barani, and genus Pelias that is consisted basically of two lineages covering P. berus and P. ursinii-kaznakowi complex. Secondly, Kalyabina-Hauf et al. (2004) studied systematic phylogeny of P. berus complex, and they found that P. bosniensis and P. barani were morphologically different from P. bersus and are suspected to be adifferent species of them. In addition, they reported that if P. barani would be recognized a separate species, P. barani was supported as paraphyletic, with P. berus. Finally, Garrigues et al. (2005) indicated that molecular phylogeny of genus Vipera, which has three main branches of the European clade, were distinguished the Pelias group including P. barani, Vipera ammodytes, and Vipera aspis.

    Species distribution modeling creates an expected distribution map of a species based on climatic and others environmental conditions known presence localities (Kozak et al., 2008). It is also useful for conservation strategies and selection of protected areas (Gül, 2013) as well as the relationship between divergence and speciation mechanisms, potential geographic distributions of species on speciation (Graham et al., 2004).

    In the text the main goal is to define the climatic patterns and factors affecting species distribution. Therefore, I ran species distribution modeling by Maxent (Philips et al., 2006) because knowledge about the geographical distribution of P. barani is crucial for conservation and spatial planning.

    2. Materials and Methods

    2.1 Studied Species A female Pelias barani specimen was found in village Büyükk?y of ?ayeli, Rize, at 529 m above sea level, on October 18, 2014 by Rahime USTABA? from Twelfth Region Headship in Rize under Ministry of Forest and Water Affairs (Figure 1). After analysis of morphological features of the specimen (Table 1) at the Zoology Research Laboratory, Recep Tayyip Erdo?an University, it was safely released back into its natural habitat.

    2.2 Environmental Variables 19 bioclimatic variables were downloaded from global climate layers (available at www.worldclim.org) in the highest resolution at 30 arcseconds (~1 km) under current conditions (~1950–2000) (Hijmans et al., 2005). The global climate layers were clipped to the borders of Turkey using Extract by Mask in ArcGis v. 10.1. Many of the bioclimatic variables are very similar to each other. Therefore, all bioclimatic variables were examined for Pearson correlation coefficient (0.75 < r < –0.75) using ENMTools 1.3 (Warren et al., 2010) and redundant variables were excluded. Six bioclimatic variables were eventually selected for the model (Table 2).

    Species distribution modeling was performed using Maxent software v. 3.3.3e (Philips et al., 2006). In order to develop species distribution modeling, 10 presence localities were used based on the new locality record and literature data (Figure 2, Table 3). Seven test points similar to presence localities were created by using Geospatial Modeling Environment version 0.7.2.0 (Beyer, 2012). The final model was composed of the average the AUC of ten replicates.

    3. Results

    3.1 Morphology of the new specimen of Pelias barani The number of ventral scales of the specimen caught from ?ayeli is 142 and the number of subcaudal scales is 29–30. The scales on longitudinal rows of dorsal at midbody were 21. The specimen had two apicals in contact with rostral and also had two canthals on each side of the head. Loreal scales between the preocular and the postnasal were 5–5. Circumocular scales around the eye were 11–12 in the specimen. Upper and lower labials of the specimen were 9–9 and 11–12, respectively. Gular scales that are in contact with the first ventral scales were 4–4. The specimen had a total length of 670 mm (head and body length 600 mm; tail length 70 mm) (Table 1).

    Table 3 Localities information of Pelias barani based on literatures data.

    3.2 Color patterns of Pelias barani The head of the female specimen captured in ?ayeli is large (Figure 3A). The dorsal color pattern is almost black in hue. The ventral color includes many different shades of brown, sometimes darkish, or whitish brown and also ground color of the ventral side is lighter than dorsal side (Figure 3B). This color variation continues across both upper labials and lower labials on each side of head. The specimen has a different color of ventral surface of the end of the tail that is orange (Figure 3C). In addition, references, which are listed in Table 1, indicated that the body color of all known specimens were totally black; however, the ground color of the second specimen of reference 4 was greyish brown with a blackish zig-zag band.

    3.3 Species distribution modeling Based on current climatic conditions distribution model of Pelias barani showed that some parts of northwest and northeast of Turkey was the areas represented with better predicted conditions for Pelias barani’s habitat (Figure 2). As a result of estimates of relative contributions of the environmental variables with Maxent, the most environmental variables with highest gain that explains more than 10% of the presence of P. barani were Bio-14 (Precipitation of driest month, 45.5%), Bio-4 (Temperature seasonality, 18.9%), Bio-15 (Precipitation seasonality, 17.9%) and Bio-5 (Maximum temperature of warmest period, 14.7%). Other variables had a percent contribution less than 5%. The average test AUC (the area under the receiver operating characteristic curve) value of the distribution model of P. barani was 0.904 ± 0.068 and 10 percentile training presence logistic threshold was 0.3632. Predicted suitability was highest in northwest and northeast regions of Turkey with extreme precipitation conditions that infuence potential range of P. barani during the year, but with a lower temperature variation throughout the year, low variation in total monthly precipitation throughout the year and low warm temperature anomalies throughout the year (Figure 4).

    4. Discussion

    There are two-distribution patterns for P. barani in Turkey, including the Black Sea Region (Zonguldak, Ordu, Giresun, Trabzon, Rize and Artvin localities) and the Marmara Region (Adapazar? localities). The Black Sea Region has the greatest amount of precipitation in Turkey. Its summer is warm and humid and the winter is cool and damp (Borysova et al., 2005). Marmara Region consists generally of three zones (?stanbul and Y?ld?z Mountain to the north, ?zmir and Ankara to the south, and Sakarya). Therefore, it is the region that has the greatest diversity of climate variable. It has Mediterranean climate that is warm to hot, dry summers and mild to cool, wet winters on the Agean Sea coast and the south Marmara Sea coast, and has an oceanic climate that is warm summers and cool winters on the Black Sea coast (Sertel and Ormeci, 2011). Adapazar? localities found in the Sakarya zone of P. barani are similar to the Black Sea Region with regard to climatic features (Sirda?, 2005). The geographic distribution of P. barani that is limited with the north coastal areas of Turkey indicates that this species is not resistant to a wide variety of conditions (eurioic) (Figure 2). P. barani has actually been detected in particular regions under very rainy environmental conditions on the Anatolian range. I found that the model, which explains the current distribution pattern of P. barani, is based on the precipitation of driest period (Bio-14), Temperature seasonality (Bio-4), Precipitation seasonality (Bio-15) and Maximum temperature of warmest period (Bio-5) of northwest and northeast of Turkey. Summer temperature and precipitation are probably a limitation factor of P. barani’s dispersion (Figure 2). Therefore, P. barani inhabits towards to the Black Sea region of Turkey. In fact, the geographical structure of Anatolia plays a significant role for a rich biodiversity because the Anatolia generates from multiple glacial refugia (Bilgin, 2011; Tarkhnishvili et al., 2012). This suggests that occurrence of the genetic diversity correlates with differentiation in the ecology of local refugia within Anatolia (Gül, 2013). The important mountain chains, such as Toros Mountains, North Anatolian Mountains, the Anatolian Diagonal and Western Anatolian Mountains, are a barrier affecting the distribution of many amphibians (Gül, 2013; ?zdemir et al., 2014) and reptiles (Kapli et al., 2013; Sindaco et al., 2014). Similarly, Brito et al. (2008) showed that distribution of the viperid snakes (Vipera latastei and V. monticola) were influenced by the precipitation of driest period for Eastern Iberia, Algeria, and Rif and Middle Atlas, and High Atlas except Western Iberia. In biogeographical scenario of Vipera seoanei, another study represents that the origin of genus Pelias can be expanded from the north Black Sea region toward Europe between the late Miocene and early Pliocene, and range expansions of the genus Pelias were affected by cooler temperatures of Pleistocene while warm temperatures of middle Pliocene prevailed its expansion (Martínez-Freiría et al. 2015). In fact, species of the genus Pelias can be better adapted to colder climates (Garrigues et al., 2005). In addition, several studies support that climatic factors are responsible for geographical distribution of many reptile species (Santos et al., 2006; Brito et al., 2008; Brito et al., 2011; Sow et al., 2014; Martínez-Freiría et al., 2015).

    Consequently, the P. barani specimen with new locality in this study has similarities to specimens in the literature in terms of morphometric measurements (Table 1). Since P. barani is a rare species, new locality records are very important in order to understand the distributional ranges of the species. In addition, this study represents that climatic conditions restricts its potential distribution in Turkey, and also it has been suggested that local precipitation patterns was important for the distribution model of the species.

    According to IUCN Red List, P. barani (Vipera barani in IUCN) is listed as near threatened (NT) and it is known as pontic endemic (Venchi and Sindaco, 2006). Population trend of P. barani has been decreased because of habitat loss, and persecution. Similarly, I observed habitat loss caused by destruction of forest through commercial harvest and construction of roads in Büyükk?y locality. In addition, it is killed like many snakes when P. barani is seen by the local people. I also realized that many amphibians and reptiles were being killed on roads, and thought that P. barani might be killed like others. Therefore, habitat destruction, road deaths and deathscaused by local human activities is a major threat to survival of P. barani and significant cause of extinction of P. barani throughout Black Sea coast. As a result of all these threats, it might be candidate to enter Vulnerable (VU) category under the red list category in the near future. Literature information about its distribution and ecology are very scarce. Therefore, it’s a new locality record and climatic preferences might be useful for conservation of this pontic endemic viper.

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    Dr. Serkan GüL, from Recep Tayyip Erdo?an University, Rize, Turkey, with his research focusing on amphibians and reptiles of the Middle East

    E-mail: serkan.gul@erdogan.edu.tr

    11 November 2015 Accepted: 18 May 2015

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