Istanbul University, Science Faculty, Department of Biology, Istanbul-Turkey
To determine the Ostracoda fauna of the Istranca region, this preliminary study was performed and seven stream, Kuzuludere, Büyükdere (Çilinkozdere), Sultanbahçedere, Papuçdere, Elmalı, Kışla and Efendi stream, located in Istranca region, were investigated. In this way, ten spe-cies; Ilyocypris bradyi Sars, 1890; Pseudocandona albicans (Brady, 1864); Candona sp; Candonopsis kingsleii (Brady & Robertson, 1870); Physocypria kraepelini G. W. Müller, 1903; Heterocypris salina (Brady, 1868); Psychrodromus fontinalis (Wolf, 1920); Cypridopsis vidua (O.F. Müller, 1776); Potamocypris variegata (Brady & Nonman, 1889); Limnocythere inopinata (Baird, 1843) were identified. The highest species number was found in Sultanbahçe stream. Also Pseudocandona albicans is new record for Thrace region of Turkey.
Istranca Streams, Taxonomy, Ostracoda, Crustacea
Ostracods are living beings, which have been able to sustain since Cambrian. They have been spreading all over the water bodies of world. Os-tracods are not only used as ecological indicators (Mezquita et.al., 2001) but also utilized in pa-laeoenvironmental studies (Mischke, 2001). ‘Os-tracoda’ has been the subject of many faunal and ecological studies. Generally faunal studies were performed in the lakes (e.g. Altınsaçlı, 1993; Külköylüoğlu, 1998; Dügel et al., 2008). In Tur-key, ostracod fauna of flowing waters have re-ceived much less attention than lakes. There are only a few published addressing about fresh-water ostracods in flowing waters (Gülen and Altınsaçlı, 1999; Külköylüoğlu and Yılmaz, 2006; Yaltalıer, 2007; Özuluğ and Yaltalıer, 2008). To this end, Istranca streams named Kuzuludere, Büyükdere (Çilinkozdere), Sultan-bahçedere, Papuçdere, Elmalı, Kışla and Efendi streams are chosen as study area. The study is a preliminary study to determine the ostracod as-semblages of the seven streams.
Kuzuludere, Büyükdere (Çilinkozdere), Sul-tanbahçedere, Papuçdere, Elmalı, Kışla and Efendi streams are known as Istranca streams and located in the north-east of Thrace Region in Turkey (Figure 1). The Streams originate from the Istranca Mountains and flow into the Black Sea. In order to obtain drinking water for in-creasing human population dams were con-structed on five of them (Kuzuludere, Büyükdere, Sultanbahçedere, Papuçdere, Elmalı) by ISKI (Istanbul Water Authority) within the scope of project between 1990-1995. After the dams, res-ervoirs with different morphometrical features were formed in the area.
The water resources of stream are spring wa-ter and also, the water of streams and reservoirs are used as drinking water. Basin of streams is completely surrounded with oak and beech for-ests. Until recent years it was very difficult to get access to those streams in the forest region. Thanks to the roads built during the process of supply piping, the streams become accessible. The Ostracoda assemblages of this region is at-tractive because there is no environmental pollu-tion in the concerning area.
All of the material from the streams were collected with a special hand net made of Müller fabric. Material inside mud was fixed with 4% formaldehyde and washed with pressurized tap water using sieves, 0.25; 0.16; 0.08 mm of mesh sizes repeatedly in the laboratory. Ostracod specimens were preserved in 70 % ethyl alcohol; soft body parts slides were prepared with dissec-tion needles inside polyvinylalcohol lactophenol and orange-G. Identification of species is based on morphological aspects of the carapace and the soft body parts. During the classification Meisch 2000 was used. Dissolved oxygen, conductivity, pH and temperature values of the stations were measured at the area with portable WTW multi-line P4. Physical and chemical parameters of the streams with codes and geographical coordinates can be seen at the Table 1.
The study was performed to determine the Ostracoda fauna of the Istranca streams and ten species were found. Tables 2 summarize the information on distribution and total number of the species in the study area that results of this study. Also the list including identified ostracod species with codes of sampling site and specimen number are given as follow.
Subclass: Podocopa G.W. Müller, 1894
Order: Podocopida Sars, 1866
Suborder: Podocopina Sars, 1866
Superfamily: Cypridoidea Baird, 1845
Family: Candonidae Kaufmann, 1900
Subfamily: Candoninae Kaufmann, 1900
Material: St38, 1 ♀
Species status of genus Candona was not deter-mined due to low specimen number.
Pseudocandona albicans Brady, 1864
Material: St21, 5 ♀; St29, 1 ♀; St35, 2 ♀.
According to Meisch (2000) the species is Synonym with Candona paralella. The rare spe-cies generally prefers small water bodies with a muddy bottom and lives in permanent and temporary stagnant or slow flowing waters (Meisch 2000). In Turkey, it was recorded firstly from lake Birgi (İzmir) as bisexual population of Candona paralella by Gülen (1985b). In our study, P. albicans was found in three streams (Sultanba-hçe, Papuçdere, Elmalı) and it is first report for Thrace region (Figure 2).
Candonopsis kingsleii (Brady & Robertson, 1970)
Material: St7, 3 ♀, 1 ♂; St21, 1 ♀, 4 ♂.
Generally, the species recorded from littoral zone of lakes and small permanent water bodies and several records from underground waters (Meisch 2000). In Turkey, C. kingsleii, was re-corded firstly by Gülen (1985a) from hot water spring (Bağlama köyü – Antakya). The species is widely distributed both Thrace and Anatolia (e.g. Altınsaçlı, 1993; Gülen, 1985b; Özuluğ, 2000; Özuluğ, 2002).
Subfamily: Cyclocypridinae Kaufman, 1900
Physocypria kraepelini G.W. Müller, 1903
Material: St33, 1 ♀; St34, 2 ♀, 2 ♂.
P. kraepelini has wide distribution like C. kingsleii, (e.g. Gülen, 1985a; Gülen, 1985b; Öz-uluğ, 2000; Dügel et al., 2008,).
Family: Ilyocyprididae Kaufmann, 1900
Ilyocypris bradyi Sars, 1890
Material: St21, 2 ♀.
The species is a common and wide spread Holarctic species and also there is many record from Thrace and Anatolia (e.g. Gülen, 1977; Gülen and Altınsaçlı, 1999; Özuluğ and Kılıç, 2002; Dügel et al., 2008).
Family: Cyprididae Baird, 1845
Subfamily: Herpetocypridinae Kaufmann, 1900
Psychrodromus fontinalis (Wolf, 1920)
Material: St19, 1 ♀.
P. fontinalis is very similar species with P. olivaceus. P fontinalis would be distinguished with very broader calcareous inner lamella at booths ends of valves and posterior uropodal spine with filamentous tip (Meisch 2000).
Subfamily: Cyprinotinae Bronshtein, 1947
Heterocypris salina (Brady, 1868)
Material: St40, 32 ♀.
Although H. salina is common and widely distributed species, it is found only one station with the highest specimen number.
Subfamily: Cypridopsinae Bronshtein, 1947
Cypridopsis vidua (O.F. Müller, 1776)
Material: St7, 8 ♀; St17, 10 ♀; St21, 1 ♀; St28, 3 ♀; St33, 3 ♀; St34, 6 ♀; St37, 5 ♀; St38, 5 ♀.
C. vidua which is the most frequently species and it was found almost all streams (Table-2). Ac-cording to Dügel et al. (2008) C. vidua has wide range of tolerances to different environmental conditions.
Potamocypris variegata (Brady and Norman, 1889)
Material: St7, 4 ♀; St37, 4 ♀.
It is common and widely distributed species (Meisch, 2000).
Superfamily: Cytheroidea Baird, 1850
Family: Limnocytheridae Klie, 1938
Limnocythere inopinata (Baird, 1843)
Material: St21, 2 ♀; St30, 1 ♀; St33, 2 ♀.
It is also common and widely distributed species (e.g. Meisch, 2000; Kılıç, 2001; Özuluğ, 2000).
In addition the taxonomical features, distribu-tion of the species at the area are very interesting. The highest species number (6) was found in Sultanbahçe stream (Table 2). Other four streams, Kuzuludere, Papuçdere, Büyükdere, Elmalı, have equal species number (3). With regard to size and flow rate Papuçdere is the largest stream among the considered streams in this study. Even though highest sampling number of Papuçdere stream, only three species was found. This situation suggests that high flow rate could have negative effect on the species distribution.
This is a taxonomical study to contribute to Ostracoda fauna of Turkey thus ten species were reported from Istranca streams and one of them, Pseudocandona albicans, is the first time, have been recorded in the Thrace region of Turkey. Finally, this study is a preliminary study, more detailed and seasonal study including spring point would be suggested to perform in the fu-ture.
This work was supported by the Research Fund of The University of Istanbul. Project number 1550/16012001. Also I would like to tank Dr. Hülya Sarı De-Zeu for her help during the lab study and Dr. E. Pietrzeiniuk for giving me the opportunity to compare with their collection in the Naturkunde Museum -Berlin.