J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 211 http://jad.tums.ac.ir Published Online: May 27, 2017 Original Article Larval Habitats Characteristics of Mosquitoes (Diptera: Culicidae) in North- East of Iran Aioub Sofizadeh 1, *Seyed Hassan Moosa-Kazemi 2, Hossein Dehghan 2 1Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran 2Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran (Received 1 Feb 2014; accepted 7 May 2016) Abstract Background: There are unorganized, published documents about the ecology of mosquitoes (Diptera: Culicidae) in northeastern part of Iran. The purpose of this study was to determine the distribution and characteristics of larval habitats of Culicidae in Kalaleh County. Methods: Larvae were collected using dipping method and adults by human landing catch technique during April– October, 2012. Larval habitat characteristics were recorded such as vegetation status, and sunlight, water situation. Lacto-phenol and de Faure’s media were used for conserving and mounting samples. Data were analyzed using SPSS statistical software, version 11.5. Results: Out of the 395 larvae collected, 332 were adult mosquitoes comprising; Culiseta, Culex, Anopheles and Ochlerotatus genera and 14 species including An. superpictus, An. maculipennis s.l., An. hyrcanus, An. psudopictus, An. claviger, Culex pipiens, Cx. theileri, Cx. perexiguus, Culiseta longiareolata, Cs. subochrea, Ochlerotatus cas- pius, Oc. echinus and Oc. geniculatus. Culex pipiens larvae were predominant (27.6%) and Cs. subochrea (1%) was found as the lowest species in terms of number. In the adult form, Cx. pipiens (28.9%) was predominant whereas, Cs. subochrea and Cx. perexiguus were reported to have had the lowest frequency. Conclusion: The larvae of An. superpictus and An. maculipennis species as the main vectors of malaria in north of Iran were reported in permanent habitats with clear water and vegetation, full and partial sunlight situations and muddy as well as sandy substrates that are important in larvicide application programs. Exclusive studies are neces- sary to diagnose An. maculipennis species complex using molecular and morphological analysis in the future. Keywords: Larval habitats, Mosquitoes, Iran Introduction Culicidae family is one of the largest and most medically important families of Diptera. By now, 64 species and 3 subspecies have been identified in seven genera and 16 sub- genera in Iran (Azari-Hamidian 2007a). Hab- itats of the mosquito larval stages affect the distribution pattern of adult stages. Mosquito habitats are classified as natural or artificial, permanent or temporary. Indeed, larval habi- tats are considered as specific for each mos- quito species. Moreover, studies on mosqui- to larval habitats could be useful for vector control programs (Bruce-Chawat 1980). There are scattered studies on bionomics and ecology of mosquitoes in northeast of Iran. Macan (1950) mentioned some ecological as- pects of Anopheles species in the near East of Iran. Dow (1953) reported some characteristics of larval habitats of six Culex species. Larval habitats of Cx. pipiens were previously stud- ied in Tehran Province (Golestani 1967). Lotfi (1970, 1973, and 1976) studied temperature and pH of larval habitats of mosquito larvae in Iran. The characteristics of larval habitats of mosquitoes were subsequently reported in Minab area, south of Iran (Yaghoobi-Ershadi et al. 1986). The distribution and characteristics of larval habitats of mosquitoes in Iran were *Corresponding authors: Dr Seyed Hassan Moosa- Kazemi, Email: moosakazemi@tums.ac.ir http://jad.tums.ac.ir/ mailto:moosakazemi@tums.ac.ir J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 212 http://jad.tums.ac.ir Published Online: May 27, 2017 studied by Zaim in 1987. The ecology and fau- na of mosquitoes were reported in Esfahan Province (Mousa-Kazemi et al. 2000a). Azari- Hamidian (2005, 2006, 2007b, 2011) and Azari-Hamidian et al. (2011) reported diver- sity and larval habitats of mosquitoes in the north of Iran. Besides, physical and chemical factors affecting larval habitats of Anopheles species were studied in southeast of Iran (Ghanbari et al. 2005). Some studies about the ecology and fauna of mosquitoes were re- ported in Neka County, northern part of Iran (Nikookar et al. 2015). Ecology and morpho- logical characteristics of mosquitoes were re- ported in Yazd City, central Iran (Dehghan et al. 2010). Larval habitats and biodiversity of anopheline mosquitoes and some environmen- tal characteristics were studied in southern Iran (Hanafi-Bojd et al. 2012, Soleimani-Ah- madi et al. 2013). There are scattered information about fau- na and ecological characteristics of mosqui- toes in Golestan Province. By now, 10 Anoph- eles and 14 Culicinae species were identified using morphological characters and the sur- face patterns of eggs. Earlier studies had been conducted in northeastern part of Iran includ- ing Mazandaran and north Khorasan Prov- inces (Gutsevich 1943, Zolotarev1945, Dow 1953, Zaim 1987, Sedaghat et al. 2003, Ni- kookar et al. 2015). Mosquito-borne diseases including malar- ia, arboviral diseases and filariasis are the most common arthropod borne diseases in the world (Gubler 1998). Presently, malaria is one of the most important problems in Iran. Golestan Province was one of the malaria foci in Iran but there are no imported cases in the prov- ince. Recently, number of endemic foci of malaria has been identified in different neigh- boring countries of Iran including Afghanistan, Pakistan and Tukmenistan and potential vec- tors are widely dispersed. However, a rapid spread of the diseases is likely to occur due to the lack of vector control programs (Min- istry of Health and Medical Education, 2012). Epidemics occur in Turkmenistan, a neigh- boring country of Iran, climate change and the imported cases are considered as the most rea- sons for the increase in diseases from 2003– 2004 (Ministry of Health and Medical Edu- cation, 2012).. Kalaleh County is located in the north-east of Iran. Because of favorable weather which supports the breeding of mosquitoes, risk of malaria transmission, immigration and lack of malaria control, it is important to ob- tain adequate information in the field of ma- laria epidemiology in order to optimize the implementation of fundamental research pro- grams. In addition, study on the ecology of malaria vectors in this area will help obtain better management of vector control and prop- er approach to malaria control programs. Therefore, this study was carried out to determine some ecological aspects of the Culicidae species and characteristics of their habitats in Kalaleh County, Golestan Prov- ince, northeast of Iran. Materials and Methods Study area A cross-sectional study was carried out in Kalaleh County, Golestan Province, northern Iran from April to October 2012. This study took place in seven randomly selected rural villages of the County (37° 70 'N 55°81' E). The samples were collected in plain, slope and mountainous areas. The province is bounded by Caspian Sea and Mazandaran Province in the West, Semnan Province in the South, North Khorasan Province in the East and Turkmen- istan Country in the North (Fig. 1). Most parts of Golestan Province are plain and more than 2/3 of the plain areas have arid and semiarid climates and 1/3 of others have a mild cli- mate. This County has 4962km and a popula- tion of 153261 people and is located in north- east of Golestan Province. The main agricul- tural products are Alfa alfa, water melon and cotton. Maximum and minimum of precipita- tion were recorded as 40.8 and -0.02 respec- http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 213 http://jad.tums.ac.ir Published Online: May 27, 2017 tively and mean annual relative humidity was recorded as 67%. The total annual rainfall was 772mm, the minimum in August and maxi- mum in February. Mosquito sampling Sampling was carried out using dipping method for collecting mosquito larvae and night catch for adult collection. Larval sam- pling method was carried out using standard dipper of 350ml. Each habitat was sampled in different parts of the larval habitats for 10 times. In order to clarify the samples collect- ed, they were conserved and transported to the laboratory in vials containing lacto-phe- nol solution. The vials were labeled based on sample’s date code and their associated habi- tats. Features such as larval habitat status (per- manent or temporary, stagnant or slow-run- ning water), vegetation type, substrate type, habitat types and position of the sunlight were recorded on special forms. The night catch method was carried out using suction tubes from animal baited traps. Animal baited col- lection was conducted from 18.00 PM to 03.00 AM monthly in fixed animal shelters randomly placed in each village. Sample con- tainers were protected from light and heat and were transferred to the Laboratory of School of Public Health, Tehran University of Medical Sciences, where the authors iden- tified the specimens using the taxonomic keys of Shahgudian 1960, Zaim and Cranston 1986, Harbach 1985, and Azari-Hamidian and Harbach 2009. The mosquito name ab- breviations were cited based on Reinert (2009). Results Overall, 395 larvae and 332 adult mosquitoes in 4 genera and 14 species in seven sampling places were found in this area. Four species of Culex, five species of Anopheles, two spe- cies of Culiseta and three species of Ochlero- tatus were identified. The species of mosquito larvae which were reported included: An. superpictus Grassi, An. maculipennis s.l, An. hyrcanus (Pallas), An. psudopictus, An. claviger (Meigen), Cx. pipiens Linnaeus, Cx. theileri Theobald, Cx. hortensis Ficalbi, Cx. perexiguus Theobald, Cs. longiareolata (Macquart), Cs. subochrea (Edwards), Oc. caspius s.l (Pallas), Oc. echinus (Edwards) and Oc. geniculatus (Olivier). All the species were found in adult forms except Cx. perexiguus. Culex pipiens and Cs. longiareolata were the dominant species reported. The larvae and adult species of Cx. theileri, Cx. pipiens, Oc. caspius and Oc. echinus in all larval habitats were collected and presented in Table 1 and 2. The association of Cx. pipiens larvae with the other Culicidae species was more than the other species (Table 3). Larval habitats of some mosquito species were diverse. Anopheles claviger and Oc. ge- niculatus larvae were collected only in per- manent larval habitats (Table 4). An. claviger, An. superpictus, An. hyrcanus, Oc. geniculatus larvae were found in the larval habitats with- out vegetation, whereas Cs. longiareolata and Cs. subochrea were collected from habitats with vegetation (Table 4). Most larval hab- itats were found with substrate of mud and sand bottom and fewer larvae were collected in rocks and cement substrates. Besides, total number of samples of Anopheles species was collected in fresh water (Table 4). http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 214 http://jad.tums.ac.ir Published Online: May 27, 2017 Table 1. Frequency of mosquito larvae which were collected by dipping method in Kalaleh County, 2012 P e r c e n ta g e to ta l G h a r a n k i J a n g a l S a d e c h a m r a n B a r b a r g h a le h G o r g a n d o z B e ili ju n g le G h o sh e sa v e r ju n g le K h e d e r -O lia ju n g le Places Species 3.5 14 1 5 2 4 1 0 1 An. claviger 3.3 13 1 1 3 7 0 1 0 An. superpictus 4.8 19 4 5 2 1 4 2 1 An. maculipennis s.l 4 15 5 2 0 4 2 1 1 An. psudopictus 5.1 20 5 0 1 6 2 4 2 An. hyrcanus 18.2 71 11 11 12 10 11 12 4 Cs. longiareolata 1 4 2 0 1 0 0 1 0 Cs. subochrea 9.9 39 1 4 2 4 8 10 10 Cx. theileri 5.1 20 5 2 3 4 3 1 2 Cx. hortensis 4.3 17 5 1 4 1 4 1 1 Cx. perexiguus 27.6 109 13 14 14 15 24 14 15 Cx. pipiens 7.8 31 1 3 6 5 6 4 6 Oc. caspius 3.8 15 2 4 2 1 3 1 2 Oc. echinus 1.5 6 1 1 0 1 1 1 1 Oc. geniculatus 100 393 57 53 52 63 69 53 46 Total Table 2. Frequency of adult mosquitoes which were collected by night catch method from animal baited traps in Kalaleh County, 2012 Places Species K h e d e r O lia ju n g le G h o sh e sa v e r ju n g le G h o sh e c h a sh m e ju n g le B e ili ju n g le P a r p a r i ju n g le A g h so u ju n g le A z iz a b a d to ta l P e r c e n ta g e An. claviger 0 0 1 2 5 1 3 12 3.6 An. superpictus 5 1 0 3 1 5 2 17 5.1 An. maculipennis s.l 8 2 4 2 5 1 1 23 7 An. psudopictus 11 1 2 0 2 3 1 20 6 An. hyrcanus 12 4 2 1 0 3 3 25 7.6 Cs. longiareolata 4 2 3 2 1 0 4 16 4.8 Cs. subochrea 0 0 0 0 1 0 1 2 0.6 Cx. theileri 10 10 11 10 10 4 10 65 19.5 Cx. hortensis 0 1 0 0 1 0 0 2 0.6 Cx. pipiens 15 14 12 14 14 12 15 96 28.9 Oc. caspius 6 4 2 6 3 4 5 30 9 Oc. echinus 2 1 2 2 4 1 1 13 3.9 Oc. geniculatus 1 1 2 2 1 3 1 11 3.3 Total 74 41 41 44 48 37 47 332 100 http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 215 http://jad.tums.ac.ir Published Online: May 27, 2017 Table 3. Association of mosquito larvae collected in Kalaleh County, 2012 O c . g e n ic u la tu s O c . e c h in u s O c . c a sp iu s C x . p ip ie n s C x . p e re x ig u u s C x . h o rte n sis C x . th e ile ri C s. su b o c h re a C s. lo n g ia re o la ta A n . h y rc a n u s َ A n . p su d o p ic tu s A n . m a c u lip e n n is s A n . su p e rp ic tu s A n . c la v ig e r N o o f la r v a e h a b ita te s Species 1 2 1 1 1 3 2 1 1 5 2 3 1  5 An.claviger 5 1 2 3 6 2 4 1 5 1 3 2  1 5 An. superpictus 6 2 5 1 2 6 3 4 1 5 2  4 2 8 An.maculipennis sl 5 2 4 1 2 1 6 5 3 2  1 2 1 11 An. psudopictus 4 1 2 2 1 1 5 5 3  1 3 2 4 12 An. hyrcanus 9 7 8 9 11 14 12 11  11 12 14 13 12 14 Cs. longiareolata 1 2 3 4 5 2 1  2 1 4 5 3 2 5 Cs. subochrea 8 6 8 9 12 11  12 14 13 12 15 14 12 15 Cx. theileri 6 3 5 4 2  1 5 1 2 3 4 2 1 5 Cx. hortensis 4 3 5 4  4 1 5 2 1 4 1 2 1 5 Cx. perexiguus 15 14 12  12 14 11 13 12 14 14 15 12 14 15 Cx. pipiens 5 4  2 5 2 5 1 4 3 6 5 2 4 6 Oc. caspius 3  1 3 2 1 3 2 1 4 2 1 2 1 4 Oc. echinus  1 2 1 3 1 2 1 3 1 2 1 2 1 3 Oc. geniculatus Fig. 1. The study area of Kalaleh County, Golestan Province, North of Iran http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 216 http://jad.tums.ac.ir Published Online: May 27, 2017 Table 4. Larval habitat characteristics of mosquitoes collected in Kalaleh County, 2012 Larval habitat A n . c la v ig e r A n . su p e rp ic tu s A n . m a c u lip e n n is sl A n . p su d o p ic tu s A n . h y rc a n u s C s. lo n g ia re o la ta C s. su b o c h re a C x . th e ile ri C x . h o rte n sis C x . p e re x ig u u s C x . p ip ie n s O c . c a sp iu s O c . e c h in u s O c . g e n ic u la tu s Habitat Permanent 100 92.8 92.7 64.3 95.5 77.2 21 73 65.3 36.1 93.8 93 89 100 Temporary 0 7.2 7.3 35.7 4.5 22.8 79 27 34.7 63.9 6.2 7 11 0 Slow-running water 8 55.5 85 63 12 32 45 64 2.3 9 65.5 61 69 100 Stagnant water 92 45.5 15 37 88 68 55 36 97.7 91 35.5 39 31 0 Vegetation With 0 0 95.3 89 0 100 100 55 36 59 69.7 59 94 0 Without 100 100 4.7 11 100 0 0 45 64 41 29.3 41 6 100 Substrate Mud 100 80 14 39 79 69 65 45 65 73 31.3 96 89 100 Sand 0 20 86 61 21 21 35 35 25 27 47.7 3 11 0 Rock and Cement 0 0 0 0 0 10 0 20 10 0 21 1 0 0 Water Situation Turbid 0 0 0 0 0 65 78 64 49 61 81 79 0 55 Clear 100 100 100 100 100 35 22 36 51 39 19 21 100 45 Sunlight situation Full sunlight 0 0 94.5 79 21.8 89 24 56 61 59 63 69 69 56 Partial sunlight 65 65 5.5 21 41 11 76 44 39 41 37 31 31 44 Shaded 35 35 0 0 37.2 0 0 0 0 0 0 0 0 0 Habitat Kind Natural 100 55.9 55.8 35.5 100 65 82 87 71 89 100 36 74 69 Artificial 0 44.1 44.2 64.5 0 35 18 13 29 11 0 64 26 31 Discussion In our study, a total of 395 larvae and 332 adults were found in 4 genera and 14 species. The mosquito species that were identified included, An. claviger, An. hyrcanus, An. mac- ulipennis s.l, An. psudopictus, An. superpictus, Cx. hortensis, Cx. perexiguus, Cx. pipiens, Cx. theileri, Cs. longiareolata, Cs. subochrea, Oc. caspius, Oc. echinus and Oc. geniculatus. The checklist of Culicidae has been pre- pared and reported in Mazandaran, Golestan and North-Khorasan Provinces (Dow 1953, Zaim 1987, Sedaghat et al. 2003, Sedaghat and Harbach 2005, Azari-Hamidian et al. 2011, Nikookar et al. 2015). The mosquito species which were recorded in this area were discovered by other authors who used PCR technique and those that were not identified or reported in our study are shown by aster- isk (*) as follows: Anophles claviger Meigen, An. hyrcanus Pallas, An. maculipennis Meigen, An. melanoon Hackett*, An. persiensis Linton, Sedaghat and Harbach*, An. plumbeus Stephens*, An. pul- cherrimus Theobald*, An. pseudopictus Grassi, An. sacharovi Favre*, An. superpictus Grassi, Aedes vexans Meigen*, Culex hortensis Fi- calbi, Cx. mimeticus Noe*, Cx. perexiguus Theobald, Cx. pipiens Linnaeus, Cx. theileri Theobald, Cx. tritaeniorhynchus Giles*, Cx. modestus Ficalbi*, Culiseta annulata Schrank*, Cs. longiareolata Macquart, Cs. subochrea Edwards, Ochlerotatus caspius s.l. Pallas, http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 217 http://jad.tums.ac.ir Published Online: May 27, 2017 Oc. echinus Edwards, Oc. geniculatus Olivi- er, Oc. pulcritarsis* Rondani, Uranotaenia unguiculata Edwards*. Dow (1953) mentioned Anopheles mos- quito fauna in Gorgan (Aliabad and Ramian) including: An. hyrcanus var. pseudopictus (in the now An. pseudopictus), An. pulcherrimus, An. superpictus, and An. maculipennis group (An. maculipennis, An. melanoon subspecies subalpinus (in the now subspecies of "subal- pinus" is synonym of "melanoon") (in and An. sacharovi). Anopheles pulcherrimus was reported from Ali-Abad of Golestan Province by Dow in 1953. This species was reported in North-Khorasan (Azari-Hamidian et al. 2011), Moreover, the occurrence of this species in Golestan Province needs more considera- tions for future studies. Sedaghat et al. (2003) reported the occurrences of An. maculipennis, An. sacharovi, An. persiensis based on mo- lecular identification and ITS2 sequences in Mazandaran Province which was bordered with Golestan. Sedaghat and Harbach (2005) confirmed the presence of An. melanoon, An. persiensis and An. pseudopictus species in Mazandaran Province. Zaim (1987) reported 12 Culicinae spe- cies in Mazandaran including: Ae. vexans, Oc. geniculatus, Oc. pulcritarsis, Oc. echinus, Cx. hortensis, Cx. mimeticus, Cx. perexiguus, Cx. pipiens, Cx. theileri, Cx. tritaeniorhynchus, Culiseta longiareolata, Cs. subochrea. Ni- kookar et al. (2015) reported nine species of mosquito including: An. claviger, An. maculi- pennis, An. plumbeus, An. superpictus, Cs. annulata, Cs. longiareolata, Cx. mimeticus, Cx. pipiens, and Oc. geniculatus in Neka Coun- ty, Mazandaran Province. Azari-Hamidian et al. (2011) reported fourteen species of mos- quito representing five genera in North-Khora- san Province including: An. claviger, An. mac- ulipennis, An. superpictus, An. pulcherrimus, Cx. hortensis, Cx. mimeticus, Cx. modestus, Cx. perexiguus, Cx. pipiens, Cx. theileri, Cx. tri- taeniorhynchus, Cs. longiareolata, Oc. caspius and Ur. unguiculata In our research, An. claviger was collected in permanent and stagnant habitats with mud- dy substrate, clear water, without vegetation. This species was only collected from natural habitats. In parallel, larval habitats of this spe- cies were reported in spring pools with par- tial sunlight, slow running water and shaded streams in Iraq and western Iran (Macan 1950). Other larval habitats of this species were ex- pressed as small shallow and shaded stream, with vegetation in Maragheh area in north- western part of Iran (Dow 1953). Nikookar et al. (2015) had found the larvae of An. clavi- ger in permanent and stagnant water envi- ronments with vegetation and clay and stone substrate. In parallel, Macan (1950) had found An. claviger larvae in semi sunlight springs, and slow running pools of water in Iraq and western Iran. Dow (1953) reported the larval habitat of this species in shallow and small pools with little vegetation. In this present study, An. maculipennis larvae were mainly collected from perma- nent and slow running water environments with vegetation. The other characteristics of larval habitat of the species were found as clear water, sunlight situations, and habitats with sandy substrate. The presence of An. maculipennis larvae was reported in perma- nent, transparent, semi-shady natural larval habitats with vegetation and cement or stone substrate (Nikookar et al. 2015). In parallel, the larva of this species was found in habi- tats with gravel substrate, sunny springs, and pools with stagnant water (Azari-Hamidian 2007b, Azari-Hamidian et al. 2011). At least 12 palearctic members of An. maculipennis complex were reported including An. atro- parvus, An. beklemishevi, An. labranchiae, An. maculipennis, An. martinius, An. melanoon, An. messeae, An. sacharovi, An. persiensis, An. daciae, An. lewisi and An. Artemievi (White 1978, Ribeiro et al. 1988, Linton et al. 2002, Sedaghat et al. 2003ab Djadid et al. 2007). Dow (1953) had reported the occurrence of An. subalpinus (in the now "subalpinus" is http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 218 http://jad.tums.ac.ir Published Online: May 27, 2017 synonym of "melanoon") in Sari, Babolsar, Mazandaran Province. Saebi (1987) also cited the occurrence of An. messeae and An. melanon from Guilan Province, and An. sacharovi and An. hyrca- nus in Golestan Province. This species has been identified in Guilan Province (Azari- Hamidian et al. 2004), Mazandaran and Go- lestan Provinces (Zaim et al. 1986). Anoph- eles maculipennis s.l. associated with An. hyrcanus, An. claviger from Mazandaran Prov- ince previously (Nikookar et al. 2015). An. sacharovi was cited in Mazandaran and Go- lestan Provinces (Sedaghat et al. 2003). Pres- ently, five members of An. maculipennis com- plex have been reported. Anopheles maculi- pennis and An. sacharovi were identified based on the characteristics of eggs, larvae and adults as well as through the PCR tech- nique, An. messeae, An. persiensis and An. melanoon were identified based on pattern of eggs surface and PCR technique (Sedaghat and Harbach 2005). Anopheles maculipennis was reported more in rice fields, while An. sacharovi was found more in mountainous areas (Mousa-Kazemi et al. 2000, Sedaghat et al. 2003). Although, it is difficult to find the difference between An. maculipennis and An. sacharovi species in larval stages, but in our research An. maculipennis species was identified based on the Azari-Hamidian and Harbach (2009)'s systematic key. Anopheles superpictus was reported as one of the main malaria vectors and salivary in- fection was found as ranging from 0.65 to 4.6% (Manuchehri et al. 2003). This species with An. maculipennis was considered as the malaria vector during the outbreak of the dise- ases which had occurred in Azerbaijan at the borderline of the country, Armenia, and Tur- key countries in 1990. However, after the in- dependence of the southern republics of the former Soviet Union, Iran was threatened by imported malaria cases (Oshaghi et al. 2011). In present study, An. superpictus was col- lected in natural habitats. The characteristics of larval habitat of this species were mainly in permanent water without vegetation, clear water, semi-sunlight and shaded habitats with muddy substrate. Zolotarev (1945), Dow (1953) and Nikookar et al. (2015) have reported the occurrence of this species in Mazandaran Prov- ince. Anophles superpictus larvae was found in permanent, stagnant, with muddy substrate, transparent water, semi-shady, natural with vegetation habitats in Neka county, northern Iran (Nikookar et al. 2015). Moreover, Azari- Hamidian et al. (2011) have stated its pres- ence in stagnant, transient, muddy substrate, full sunlight water with vegetation in natural habitats in Guilan Province, northern Iran. Fur- ther support for our results comes from some previous studies carried out in Kermanshah and Kurdistan Provinces, western Iran (Moosa- Kazemi et al. 2015, Macan 1950), Zarrin-Shahr and Mobarakeh areas of Isfahan Province, center of Iran (Mousa-Kazemi et al. 2000a), Ardabil Province, northwestern Iran (Yaghoobi- Ershadi et al. 2001), Rasht County of Guilan Province, northern Iran (Azari-Hamidian et al. 2002b) and in Iranshahr, southeastern part of the country (Ghanbari et al. 2005). Three genotypes named X, Y, and Z within An. superpictus during the molecular study were reported in Iran (Oshaghi et al. 2008). By now, there are no reports about the geno- types of this species in Golestan Province. However, it needs to be studied in the future. In our study, An. hyrcanus was found as the dominant species in larval habitats fol- lowed by An. maculipennis in Kalaleh Coun- ty. An. hyrcanus larvae were collected from habitats with varieties of 95.5% permanence, 88% stagnant water, and were only collected in clear water, natural habitats without vege- tation. Different sunlight situations charac- terized the larval habitats of this species. The current species prefer the permanent habitats to temporary larval habitats. Moreover, An. pseudopictus prefers the habitats with slow running water while An. hyrcanus prefers the stagnant water habitats. http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 219 http://jad.tums.ac.ir Published Online: May 27, 2017 Three species of the hyrcanus Group in- cluding An. hyrcanus, An. peditaeniatus and An. pseudopictus have been reported in Iran (Azari-Hamidian et al. 2006, Azari-Hamidian 2007a). Several species of An. hyrcanus Group have been reported as the malaria vectors in the Oriental and Palearctic Regions, however, this species was reported as a potential ma- laria vector based on the molecular study in Guilan Province (Djadid et al. 2009). Shahgudi- an (1960) made mention of An. nigerrimus species as a variety of An. hyrcanus in its sys- tematic key, Moreover, identification of these species is very difficult and is based on this systematic key and this old record needs to be verified. Glick (1992) published keys for the identification of female anophelines of southwest Asia, which mentioned the fe- males of the Hyrcanus Group, however these characters were not reliable for distinguish- ing the females of An. peditaeniatus from other species of hyrcanus group. One charac- ter distinguished the larvae of An. hyrcanus from those of An. pseudopictus (Darsie and Samanidou-Voyadjoglou 1997). An. hyrca- nus and An. pseudopictus were reported as a single species in southeastern France based on PCR technique (Ponçon et al. 2008). ‘The systematics of the Iranian species of the Hyr- canus Group’ was published by Azari-Ha- midian and Harbach in 2009. In our study, Cx. pipiens larvae were identified in this area based on the larval seta 1 of abdominal segments III and IV. This character was observed as double seta in all of Cx. pipiens larvae samples and this con- firmed the occurrence of Cx. pipiens species. This species is cosmopolite and is distributed in all parts of the country (Zaim 1987, Ni- kookar et al. 2015). Culex pipiens was predominant in larval (27.6%) and adult (28.9%) stages. Further support to this result also came from previ- ous study, Cx. pipiens was reported as the dominant species in Yazd Province (Dehghan et al. 2010). Culex pipiens was reported as the predominant species in Guilan Province and dominant species in Isfahan Province (Mou- sa-Kazemi et al. 2000a, Azari-Hamidian 2007b). Larval habitats of this species were diverse in Kalaleh County but all samples of this species were collected in natural habitats. Similarly, Zaim (1987) cited the fresh water environments such as marshes, channels and artificial irrigation and rain-filled pools and drums as the main larval habitats of Cx. pipiens. Distribution and abundance of Cx. pipiens species were in close relationship with economic activities and development of new territories (Vinogradova 2000). Underground train systems, coal mines, drains, wells, sep- tic tanks, abandoned and variety of the natu- ral and artificial habitats were reported as the main larval habitats of Cx. pipiens (Horsfall 1955, Zaim 1987, Harbach 1988). In our study, Cx. pipiens larvae were col- lected only in natural larval habitats, further support of this result came from the previous study, Dow (1953), Lotfi (1970, 1976), Yaghoobi-Ershadi et al. (1986), Zaim (1987) and Azari-Hamidian (2007b) found this spe- cies mostly in natural habitats. Moreover, Mousa-Kazemi et al. (2000), Azari-Hamidian et al. (2002b) have reported the presence of these species from rice fields and man-made habitats respectively. Water and sewage wells as well as house ponds were reported as the main habitats of Cx. pipiens in cities (Go- lestani 1967, Lotfi 1976, Zaim 1987, Dehghan et al. 2010, 2011). In our study, Cx. theileri was found as predominant species at larvae and adult stag- es. This species was known as one of the predominant species in Northwest of Iran (Azari-Hamidian et al. 2009). Moosa-Kazemi et al. (2010) had reported that the Cx. theileri species was the second dominant species in Kurdistan Province followed by Cx. pipiens. Larval habitats of this species in our research were found as natural habitats, and perma- nent habitats with vegetation such as irriga- tion ditches, different pools, open cisterns, dis- http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 220 http://jad.tums.ac.ir Published Online: May 27, 2017 used wells seepage water and swamps (Har- bach 1988). Lotfi (1970, 1976) had reported that the predominant species were in larval habitats such as grassy and ponds, rice fields, seep- ages and agricultural pools in Iran. In our study, Cx. theileri larvae was col- lected from different types of habitats with 73% permanence, 64% slow running water, turbidity of 64% and 87% in natural habitats. The breeding place preferences of this spe- cies were full and partial sunlight habitats. In parallel, Azari-Hamian (2007b) had reported different types of larval habitats. Dehghan et al. (2010) reported that the larval habitats of this species were swam plants, permanent, and with vegetation outside or inside water environments in Hamadan Province. Dow (1953) reported that the larvae of Cx. theileri were accumulated in the pit and irrigation channels and water intakes and shallow riv- ers and river beds. Larval habitats of the species have been found as algae, water in- take and water pits, and a crock pot, house- hold pits along the river margins, floating and submerged plants (Horsfall 1955). Natu- ral and artificial habitats of Cx theileri were cited in the Country (Dow 1953, Yaghoobi- Ershadi et al. 1986). Mousa-Kazemi et al. (2000) also discovered the presence of Cx theileri larvae in the rice field, however Zaim (1987) had reported their presence in natural habitats. Natural habitats such as pools were reported as the main habitats of this species (Azari-Hamidian et al. 2002b, 2007b). In this study, more samples of Cx. horten- sis larvae were collected from natural habi- tats. Moreover, this species prefers permanent and stagnant water habitats. This species is associated with An. superpictus and Oc. Ge- niculatus, both of which prefer habitats with- out vegetation so that 66% of the larval sam- ples of this species were collected in habitats without vegetation. Culex hortensis species were found more in muddy beds and habitats with full and partial sunlight. Horsfall (1955) had reported that the main larval habitats of Cx. hortensis were algal mats, seeps, brackish pools, domestic containers, and cement channel. This species was reported in pools in the river beds, the irrigation ditches, small, spring pools of the river banks and shallow pools (Dow 1953). Natural habitat was reported as the main habitat of this species (Zaim 1987, Azari- Hamidian 2007b). This species was collected in seepages and agricultural water storage pools (Lotfi 1976). In our study, Cx. perexiguus was col- lected and reported at the first timein Goles- tan Province. More of these species were collected in natural habitats. Mousa-Kazemi et al. (2000a) have reported the occurrences of Cx. pipiens, Cx. theileri and Cx. perex- iguus in Zarrin-Shahr and Mobarakeh areas of Isfahan Province. By now, 5 species of Culiseta have been reported in Iran and they included: Cs. Al- lotheobaldia longiareolata, Cs. Culisetaalas- kaensis, Cs. Culiseta) annulata, Cs. (Culicel- la) morsitans and Cs. (Culiseta) subochrea (Azari-Hamidian 2005). In our studied spe- cies, Cs. logiareolata and Cs. subochrea were collected. There is little information availa- ble about the ecology of the Culiseta species. Larval habitats of Cs. longiareolata contained organic materials with high abundance in artificial pits of Yazd Province (Dehghan et al. 2010). Association of this species with Cx. pipiens was found in the larval habitats which were contaminated with soil and wastewater in drinking troughs made of ce- ment, a place to store water for animals and livestock in Yazd Province (Dehghan et al. 2010). In our study, Cs. longiareolata larvae were abundant, followed by Cx. pipiens and more were collected from permanent, stag- nant and full sunlight habitats with vegeta- tion. In contrast, the larval habitat of this species was without vegetation in Hamadan Province (Dehghan et al. 2011). This species has high adaptability to different ecological http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 221 http://jad.tums.ac.ir Published Online: May 27, 2017 conditions. More Cs. subochera were col- lected in natural and temporal habitats. Simi- larly, these species were collected in the same larval habitats (Zaim 1987) while all the other larvae of the species were collected from permanent habitats in Hamadan Prov- ince. Moreover, Cs. subochrea had low abun- dance in this area. This species has been identified in various studies in Iran. Similar- ly, this species was collected as the lowest species in Hamedan Province (in terms of abundance), located in the western part of Iran. They prefer the habitats with turbid wa- ter to clear water and full sunlight habitats to shaded habitats. In Hamadan area of western Iran, the larval habitat of this species was reported as the same larval habitat in our study in turbid to clear water and full sun- light habitats. Unlike the previous study, we found more larvae in shaded habitats (Dehghan et al. 2011). In our study, 3 species of Ochlerotatus including Oc. caspius, Oc. echinus and Oc. geniculatus were collected; Nikookar et al. (2015) had reported the occurrence of Oc. echinus and Oc. geniculatus in tree hole hab- itats in northern part of Iran. In our study, all the current three Ochlerotatus species pre- ferred the permanent habitats with slow- running water and muddy bed. In addition, Oc. echinus preferred the clear water habi- tats while Oc. caspius preferred the larval habitats with turbid water and Oc. genicula- tus was found in habitats without vegetation. Ochlerotatus caspius was reported as a po- tent vector for Rift Valley fever viruses as well as Dirofilaria immitis in the world (Azari- Hamidian 2006). This species loves feeding more on mammals and human and was found more in their dwellings (Azari-Hamidian 2006). In our research, this species comprised 7.8% of the larval collection and 9% of adult catches by animal baited trap collection method in var- ious areas of Golestan Province, northeastern Iran. Further support to this result comes from some previous studies carried out in Kerman- shah and Kurdistan Provinces, western Iran (Mousa-Kazemi et al. 2015), Zarrin-Shahr and Mobarakeh areas of Isfahan Province, center of Iran (Mousa-Kazemi et al. 2000a), Guilan Province, northwestern Iran (Azari-Hamidian et al. 2002a), Bushehr Province, southern Iran (Dow 1953), Eastern part of the country (Mi- nar 1974) and various parts of Iran (Zaim 1987). In Kurdistan Province, Cx. theileri was next in abundance after this species (Moosa- Kazemi et al. 2010). Ochlerotatus echinus was distributed in the Mediterranean region, north of Africa and southern Europe. In our study, out of the 9% total larvae collected from adult catches using animal baited traps in various areas of Golestan Province-northern Iran, 7.8% were Oc. echinus. In parallel, this species was re- ported in Mazandaran Province (Zaim 1987, Nikookar et al. 2015). This species has been reported in Guilan Province, northern Iran (Azari-Hamidian et al. 2002a). Ochlerotatus geniculatus was distributed in the Palearectic Region, Europe, North of Africa and Southeast Asia. In our research, this species comprised 1.5% of the larval collection and 3.9% of adult catches by ani- mal baited traps in various areas of Golestan Province, northern Iran. This species was reported for the first time in Mazandaran Province, northern Iran (Gutsevich 1943). This species has been reported in Guilan Province, northern Iran (Azari-Hamidian et al. 2002a). Conclusion The present investigation indicates some biological characteristics of mosquitoes in the northern areas of Iran. Because of diver- sity in larval habitats and variety in species of mosquito in the County, results of this study could be useful in vector control pro- grams. Several species of Anopheles were found in a lot of areas in the county. The lar- val habitats of Anopheles were found and http://jad.tums.ac.ir/ J Arthropod-Borne Dis, June 2017, 11(2): 211–225 A Sofizadeh et al.: Larval Habitats … 222 http://jad.tums.ac.ir Published Online: May 27, 2017 reported in permanent habitats with clear water. Besides, the larvae of An. superpictus and An. maculipennis species which are the main vectors of malaria in the north of Iran were reported in habitats with vegetation, under full and partial sunlight situations and muddy and sandy substrates that are im- portant in larviciding programs. Bionomic studies of other mosquitoes need to be more rigorously studied in the future. Also, more studies should be obtained in order to com- plete information about of bionomics of mosquitoes in other parts of Iran. Acknowledgements The authors are grateful to the people of villages in Kalaleh County for their kind co- operation during the study. The authors de- clare that there is no conflict of interests. 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