Fig. 1.

The study area and sampling locations in Samsun and nearby regions. Samsun: 1. Centrum 2. Ladik 3. Terme 4. Bafra 5. Carsamba 6. Kavak 7. Ayvacik 8. Ondokuz Mayis 9. Atakum 10. Yakakent 11. Alacam 12. Salipazari 13. Havza 14. Vezirkopru; Ordu: 1. Centrum 2. Fatsa 3. Unye 4. Golkoy 5. Ikizce 6. Akkus 7. Kumru 8. Mesudiye 9. Korgan 10. Gurgentepe 11. Kabaduz 12. Gulyalı 13. Catalpinar 14. Caybasıi 15. Persembe; Giresun: 1. Centrum 2. Bulancak 3. Espiye 4. Piraziz 5. Kesap 6. Canakcı 7. Guce 8. Tirebolu 9. Eynesil 10. Dogankent 11. Görele 12. Yaglidere; Corum: 1. Centrum; Amasya: 1. Centrum 2. Merzifon 3. Suluova 4. Tasova; Kastamonu: 1. Centrum 2. Hanonu; Sinop: 1. Centrum 2. Ayancik 3. Boyabat 4. Dikmen 5. Duragan 6. Erfelek 7. Gerze 8. Sarayduzu 9. Turkeli