- Research article
- Open Access
Larval habitats and species diversity of mosquitoes (Diptera: Culicidae) in West Azerbaijan Province, Northwestern Iran
BMC Ecology volume 20, Article number: 60 (2020)
The characteristics of a larval habitat is an important factor which affects the breeding pattern and population growth of mosquitoes Information about the larval habitat characteristics and pupal productivity can be utilized for the surveillance of the level of population growth, species diversity, and preferred breeding sites of mosquitoes, which are important aspects of integrated vector control. In the present study, mosquito larvae were collected from 22 natural habitats in five counties of the West Azerbaijan Province in the Northwest of Iran during May–November 2018. Physicochemical characteristics of the habitats were investigated. These included alkalinity, chloride (Cl) content, water temperature (°C), turbidity (NTU), Total Dissolved Solids (TDS) (ppm), Electrical Conductivity (EC) (μS/cm), and acidity (pH). The index of affinity between the collected species was calculated using Fager & McGowan test.
A total of 2715 specimens were collected and identified. Seven different species belonging to four genera were identified in our study sites. The species included, Culex pipiens Linnaeus 1758, Culex theileri Theobald 1903, Culex mimeticus Noé 1899, Culex modestus Ficalbi 1947, Culiseta longiareolata Macquart 1838, Anopheles maculipennis Meigen 1818complex, and Aedes caspius Pallas 1771. There was a significant difference in chloride content and water temperature preferences among the different species (P < 0.05). Also, there was no significant difference in pH, Alkalinity, Turbidity, TDS, and EC preferences among the different species (P > 0.05). The affinity between the pair of species Cx. mimeticus/Cs. longiareolata was 0.526. There was no affinity between other pairs of species or the affinity was very weak.
The physicochemical and biological characteristics of mosquito larval habitats play an important role in zoning of areas suitable for breeding and distribution. Surveillance of these characteristics can provide valuable information for entomological monitoring of mosquito vectors and for designing targeted control programs. Also, further studies should be undertaken in a wider geographical area, taking into account the complex characteristics of the physicochemical and ecological factors of the study area and their interaction with various mosquito species.
The breeding pattern and population growth of medically important mosquitoes are affected by the physicochemical characteristics of their habitats. Breeding pattern and population growth surveillance is essential in designing mosquito control programs . Monitoring mosquito larval habitats and population growth pattern, in the form of studies to identify the characteristics of the habitats, can provide valuable information on mosquitoes’ population growth levels, species diversity, and breeding sites for Integrated Vector Management (IVM) .
Vector control programs rely on the thorough knowledge of the ecology and population dynamics of mosquito species, as well as the epidemiology of mosquito-borne diseases. Therefore, research on vector habitats must be stepped up so that mosquito control programs could be carried out on sound bases .
The factors which affect mosquitoes’ oviposition site selection, also play a crucial role in larval density and species composition [4, 5]. In recent years, the suitable temperature [6, 7] and pH range  for the presence and abundance of larval species of mosquitoes have been studied and identified. Also, a direct correlation between the distribution of medically important mosquito species and physicochemical properties of their habitats, including temperature, ammonia, nitrate, pH, dissolved oxygen, and salinity has been reported by previous studies [8, 9].
In different regions of the world, the influence of physicochemical properties of mosquito larval habitats on the production of emergent mosquitoes , their body size , and embryonic development and adult fitness  have also been studied. Moreover, it has been reported that the spatiotemporal patterns of mosquito production could be influenced by variation in the properties of breeding sites, which are important determinants of growth and survival of larval populations. Thus, the identification of these factors is essential for developing control strategies for mosquitoes .
Worldwide, as well as in Iran, there has been greater emphasis on the study of malaria vectors, however, most of the studies have focused on the influence of these physicochemical factors on malaria vectors [4, 12,13,14].
Only few studies have focused on the influence of these factors on mosquito larvae. In a previous study which investigated the effects of physicochemical characteristics of larval habitat waters on a broader range of mosquito genera, there was no significant difference in temperature, pH, turbidity, electrical conductivity (EC), total dissolved solids (TDS), alkalinity, total hardness, calcium, chloride, fluoride, nitrite, nitrate, phosphate, and sulphate content of the larval habitat water among the different mosquitoes species in Qom Province in the central part of Iran . In another study, a positive correlation between the larval abundance of Cx. pipiens and the physicochemical characteristics of the larval habitat including EC, alkalinity, total hardness, and chloride content. However, the negative correlation between these characteristics and larval abundance was not significant .
Also, the environmental changes driven by urbanization and agricultural and industrial projects affect mosquito species’ diversity. Biodiversity and related important changes in geographic ranges of mosquitoes are of medical and veterinary importance, because any distributional shifts could alter and expand the range of mosquito-borne diseases [17,18,19].
The West Azerbaijan Province in the northwestern Iran is an important biogeographic region which shares a common border with four countries; Armenia, Azerbaijan, Iraq, and Turkey. These countries are endemic areas for a variety of mosquito species due to the presence of various environmental and geographical conditions favorable for the breeding of mosquitoes [20,21,22,23]. Consequently, there is a high diversity of mosquito species and spread of mosquito-borne diseases in the West Azerbaijan Province [24,25,26]. Also, this province is well-known for its abundant water resources and wetlands for migratory birds from around the world [27, 28].
By identifying the characteristics of larval habitats and species diversity of mosquitoes, the prospect and possibility of mosquito borne diseases in a particular geographical area could be determined with higher precision, and consequently, integrated vector management can be implemented with guaranteed success. The specific geographical location of the West Azerbaijan Province, its remarkable climatic diversity and abundant water resources , as well as the presence of a variety of mosquitoes and history of mosquito-borne diseases in this area has attracted the attention of public health research in recent years. The present study aimed to investigate (1) some of the physicochemical properties of mosquito larval habitats (temperature, pH, turbidity, Chloride, Alkalinity, TDS and EC), (2) possible correlation between the physicochemical parameters and the presence of mosquito species, and (3) species diversity, co-occurrence and affinity index between pairs of mosquitoes species. The results of this study would be useful in determining the environmental and biological factors of the larval habitats of mosquito vectors.
The West Azerbaijan Province is located in the northwest of Iran between latitudes 39° 46´- 35° 71 58´ N and longitudes 44° 3´- 47° 23´ E. This province shares border with 4 neighboring countries: Armenia, Azerbaijan, Iraq, and Turkey (Fig. 1). This area is characterized by forest steppe with various climates, including Mediterranean hot summer climate, coastal Mediterranean climate, and the Cold Winter climate. It also has various geographical regions such as mountainous areas near the Iraq–Turkey border, plains near the Aras and other rivers, and the Urmia Lake coastline.
Mosquito collection and identification
Larvae were collected using the probability based sampling method  from natural fixed habitats in different regions of the province (with variation in climate, habitat type, etc.), so that the results can be generalized to a wide range of habitats in the province. The selected habitats included ground pools, wetlands, stream edges, riverbeds, and river edges. The standard dipping method  was used for collecting specimens in 22 localities of five counties on a monthly basis between May and November 2018 (Fig. 1 andTable 1). Larvae were preserved in lactophenol. Microscope slides were prepared using de Faure’s medium. Third and 4th instar larvae were identified using the Iranian mosquitoes’ identification keys based on morphological characteristics .
Water samples were collected from the 22 larval habitats for at least 6 times during the study period (once a month), and the water samples were kept in 1.5 L appropriately labeled bottles. The bottles were placed inside an icebox and were transferred to laboratory. Alkalinity, chloride (Cl), water temperature, turbidity, Total Dissolved Solids (TDS), Electrical Conductivity (EC), and acidity (pH) were selected because of previous scientific reports about their correlation with the presence and abundance of different species of mosquitoes and the possibility of measuring them.
The chemical factors, including alkalinity, chloride (Cl), were analyzed based on mg/l using standard methods . The SI units for the other physicochemical parameters that were measured are as follow: water temperature (°C), turbidity (NTU), Total Dissolved Solids (TDS) (ppm), Electrical Conductivity (EC) (μS/cm), and acidity (pH). Water temperature and pH were measured on-site using a thermometer and pH probe (HANNA), respectively, and the other parameters were measured in the laboratory. Turbidity was measured using a turbidimeter device (2100P Portable Turbidimeter at Hach) and EC was measured using a conductometer device (Sension EC5 at Hach). Alkalinity and chloride content were determined using direct titration techniques. All analyses were performed according to standard methods .
The mean and standard deviation of each physicochemical parameter were calculated for each breeding site. The assumption of normality distribution was tested using the Kolmogorov–Smirnov test. Based on the results, the one-way ANOVA and Kruskal–wallis tests for variables with normal and non-normal distribution were used respectively for determination of probable statistical significant difference of means at 0.05 significance level, among the breeding sites. Then Post-hoc analysis were used to determine the significant difference between different points (in pairs). Dunn-Bonferroni and Ferroni tests were used for factors with non-normal and normal distribution, respectively.
The Canonical Correspondence Analysis (CCA) is used to elucidate the effects of environmental variables on the presence/abundance of species . In the present study, it was used to determine the response of species composition to the studied environmental variables (CCA) .
Indices of affinity
The index of affinity was calculated using Fager & McGowan test  to find the affinity between pairs of Culicidae species occurring in the same habitats, based on the following formula:
where the number of joint occurrences (J); the total number of occurrences of species A (nA); the total number of occurrences of species B (nB), and species are assigned to the letters so that nA < nB. The expressions equal to or higher than 0.5 were considered strong affinity.
Fager and McGowan  chose this cutoff because they felt that for species to be grouped together as co-occurring species, they should be found together in more than “half” their recorded occurrences. On the other hand, it is assumed that species found together in more than 50% of collection sites most probably have the same environmental needs. In other words, when one of the co-occurred species is found, it is likely that the second species is also present in the same habitat.
To evaluate the significance of this index, the “t” test was applied, considering an arbitrary significance level of 5%. The “t” test was calculated according to the formula:
A total of 2715 mosquito specimens were collected. Seven different species belonging to four genera were identified in our study sites, including Culex pipiens Linnaeus 1758 (n: 877, 32.3%), Culex theileri Theobald 1903, (n: 515, 18.9%) Culex mimeticus Noé 1899, (n: 569, 20.9%), Culex modestus Ficalbi 1947, (n: 2, 0.07%), Culiseta longiareolata Macquart 1838, (n: 29, 2.17%) Anopheles maculipennis Meigen 1818 complex (n: 263, 9.7%), and Aedes caspius Pallas 1771 (n: 430, 15.8%).
Cx. pipiens was collected from 15 (68.2%) out of the 22 collection sites. The second most distributed species was Cx. theileri. This species was found in 13 (59.1%) collection sites. The distribution of the other species was as follows: An. maculipennis complex, 10 (45.5%) sites; Ae. caspius, 6 (27.3%) sites; 5 (22.7%) collection sites for both Cx. mimeticus and Cs. longiareolata; and Cx. modestus, 1 (4.5%) site. In total, anopheline larvae were found in 10 sites (45.5%), whereas culicinae larvae inhabited 22 (100%) sites (Table 2).
The physicochemical parameters of the different collection sites and the results of Kruskal–wallis test (due to the non-normal distribution of data based on the results of Kolmogorov–smirnov test), have been presented in Table 2. Most mosquitoes’ samples were collected from Silvana (44.851419, 37.428667) and the highest species richness was observed in Gojar (44.833728, 39.487847).
Also the results of Dunn-Bonferroni post hoc analysis revealed that the chloride content of the water collected from Hashiyeh Rood (Khoy: 44° 58′ N - 38° 32′ E) and Alkalinity of the water collected from Kooraneh (Urmia: 45° 2′ N - 37° 40′ E) were significantly higher than other localities (P < 0.05), however, there was no significant difference in Temperature, pH, Turbidity, TDS and EC among the different localities (P > 0.05) (Table 2).
Means and standard deviations of the physicochemical factors of the larval habitats of the different species have been shown in Table 3. The Kruskal–Wallis statistical test was used to examine the significance of the differences in each of the environmental factors in the different localities We found a significant difference in chloride content (p Value: 0.012) and temperature (p Value: 0.003) preference among the different species (P < 0.05), but the difference was not significant for pH (p Value: 0.576), Alkalinity (p Value: 0.622), Turbidity (p Value: 0.553), TDS (p Value: 0.572), and EC (p Value: 0.572) (P > 0.05).
The affinity between the pairs of species Cx. mimeticus and Cs. longiareolata was 0.526, indicating a strong affinity. There was no affinity between the other pairs of species or the affinity was very weak; Cx. mimeticus and Cs. longiareolata (0.526), Cs. longiareolata and An. maculipennis (0.483), Cx. theileri and An. maculipennis complex (0.475), Cx. pipiens and Ae. caspius (0.456), Cx. pipiens and Cx. theileri (0.444), Cx. mimeticus and An. maculipennis complex (0.441), and Cx. theileri and Cx. mimeticus (0.427). The affinity indices between the pairs of species have been shown in Table 4.
The species’ position in space relative to the main coordinates CCA1 and CCA2 and its relationship to the direction of the gradient of the physicochemical variables have been presented in Fig. 2. The constrained inertia for the model with these variables was 27.73% for CCA2 and 32.67% for CCA1. Species-physicochemical variables interaction for all 7 variables confirmed that pH and turbidity for An. maculipennis, Alkalinity and Temprature for Ae. caspius, Chloride for Cx. mimeticus and Cx. modestus and EC and TDS for Cx. theileri and Cs. longiareolata were the most important factors that positively and directly correlated with their presence and abundance (Fig. 2).
The effects of physicochemical factors of larval habitats on the distribution of mosquito larvae were examined for the first time in the west Azerbaijan Province, northwestern Iran. In this investigation, we tried to study the distribution and physicochemical factors of mosquito larval habitat in 5 counties of the West Azerbaijan Province, where various mosquito vectors of arboviruses are present. Some studies have been conducted on the fauna and checklist of mosquitoes in parts of this region [21, 38, 39].
Canonical correspondence Analysis (CCA) of the effects of the physicochemical factors on the mosquito species showed a correlation between the presence of Cx. pipiens and the studied environmental variables, which is consistent with the findings of a recent study which reported a significant positive correlation between the density of Cx. pipiens and electrical conductivity, alkalinity, total hardness and chloride .
Also, the correlation of the abundance of specific species with any physicochemical factors can be one of the reasons for the selective distribution of species in specific areas and the selection of suitable habitat for oviposition. Identifying the exact effect of physicochemical factors on the presence and abundance of mosquito larvae in different habitats seems to be a complex process and highly dependent on the characteristics of any specific species and related factors such as the pattern of chemical use in the environment (such as pesticides). Some of the physicochemical parameters could be used as a source of energy to expand the distribution of algae and other organisms (including bacteria) that function as key food for larvae , and to provide chemical stimuli for females to select a suitable oviposition site and trigger egg hatching .
However, the results of a recent study in Iran showed no significant correlation between the abundance of larvae and the studied different physicochemical and microbial parameters .
Water temperature acts as one of the most important factors affecting the establishment and growth of some of mosquito larvae in larval habitats . Turbidity has also been reported to affect water temperature . Based on the results of previous studies and due to the high correlation between some physicochemical factors and larval abundance of some species, it has been suggested that these factors be used as predictors of the presence of species in the environment, e.g. salinity and DO for Culex pipiens and Cx. perexiguus .
The distribution of mosquito species could be affected by various environmental factors such as physicochemical factors of their breeding places in the larvae stage, interspecific association, and climate .
In addition to biological curiosity and biodiversity, any change in the diversity and population of vector mosquitoes can affect the transmission cycle and burden of related diseases. As previously reported, global warming can increase the potential for transmission of mosquito-borne diseases . Also previous studies have suggested that complex interactions exist between environmental factors and abundance of mosquito species, which necessitates time-dependent and species-specific control programs . In particular, regular and accurate monitoring of the status of important medical mosquitoes, factors affecting their distribution and population, and prediction of their control strategies in specific conditions for sensitive region such as West Azerbaijan province is of particular importance, due to its border with four neighboring countries, presence of a variety of climatic conditions, and history of mosquito-borne diseases.
The species identified in this study can transmit important pathogens. Diseases such as lymphatic filariasis , and arboviruses  can be transmitted by different species of Culex mosquitoes. Ae. caspius infection with West Nile fever virus has already been demonstrated in our study area . An. maculipennis, which is one of the important vectors of malaria , is of medical importance with a history of transmission in the region. Finally Cs. longiareolata acts as the vector of some infectious diseases such as the avian malaria [50, 51], tularemia , and arboviruses like West Nile fever [53,54,55].
A recent study [56, 57] reported the presence of five of the species identified in our study, including An. maculipennis, Cx. pipiens, Cx. theileri, Cs. longiareolata and Ae. caspius in the East Azerbaijan province. Also, another study reported the presence of An. maculipennis, Cx.pipiens, Cx. theileri, and Cs. longiareolata) in Zanjan Province, which were also identified in our study . Moreover, another study conducted in Kurdistan Province  reported the occurrence of six species, including An. maculipennis, Cx. theileri, Cx. pipiens, Cx. mimeticus, Cs. longiareolata, and Ae. caspius, which were also present in our study region. In the Kurdistan and East Azarbaijan provinces, Cx. theileri and Cx. pipiens were the most dominant species, which is similar to the findings of the present study. Our results show that Cx. theileri (10 sites) and Cx. pipiens (13 sites) were the most dominant species in the province.
A significant difference was observed between the density of An. culicifacies and calcium and EC content, and between An. turkhudi and An. superpictus and total hardness in Sistan and Baluchestan Province of Iran . The authors indicated that the larvae of An. culicifacies and An. turkhudi are more sensitive to physicochemical factors in different habitats compared with other species, which may explain the limited spread of the species in this region. Nikookar et al.  showed that positive correlation exists between the larval abundance of Cx. pipiens and physicochemical characteristics such as EC, alkalinity, total hardness, and chloride. However, Abai et al.  demonstrated that there was no significant differences in physicochemical and microbial parameter preferences among the different species, and that there was no significant correlation between the abundance of larvae and the different physicochemical and microbial parameters. Also for anopheline species, the significant effects of conductivity, total alkalinity, sulphate and chloride on their distribution and abundance have been reported .
Based on the results of the current study, there was a strong affinity between Cx. mimeticus and Cs. longiareolata (index˃0.5), but in a previous studies, no significant correlation between the presence of these two species was found [16, 61]. The difference in the results of the present study with the previous study may be due to differences in the specific environmental conditions of each region and the interaction of complex conditions in addition to the physicochemical properties of the environment with the mosquito larvae. Based on our affinity index analysis, there was no correlation between the other species which may be due to the different requirements of these species. In a recent study in southern Iran , a significant correlation between the following species was found: An. Culicifacies/An. stephensi and An. dthali, An. dthali/An. stephensi (Index > 0.5),. An. dthali/An. superpictus and An. moghulensis, and An. moghulensis/An.superpictus. Based on the affinity index of the above study, there was no correlation between An. apoci and other species.
Considering the limitations of this study, future studies should focus on a wider geographical area and the use of accurate methods for collecting mosquito larvae in order to provide evidence-based contributions to the integrated vector management.
As a limitation, in the current study, samples were collected from the same breeding site over time, pseudo-replication should be assumed and proper models such as the LMEM model should be used for future experiments to evaluate the fixed effect, the random effect and even the response variable. Also, using more accurate statistical analysis for evaluating the correlation between physicochemical factors and the presence and abundance of mosquitoes will lead to more valuable and accurate information.
Due to the considerable climatic and environmental variability affecting the establishment and spread of mosquitoes (especially diseases’ vector species) in different regions of Iran, and in particular, in the study area, the results of the present study, will be useful in determining the environmental and biological factors of the larval habitats of medically important mosquitoes. Consequently, identification of environmental factors affecting the breeding of mosquitoes can help in the mapping and prediction of oviposition site selection and distribution of these vectors and pave way for the development of entomological monitoring and targeted control programs for controlling the vectors with higher accuracy.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Total Dissolved Solids
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This article is part of the results of the first author’s dissertation for fulfillment of MSc degree in Medical Entomology and Vector Control from the Department of Medical Entomology and Vector Control, School of Public Health, Urmia University of Medical Sciences (UMSU), Urmia, Iran. The authors are grateful to Dr. Cyrus Alinia (Department of Management Science and Health Economics, School of Public Health, UMSU) for his help in statistical analysis. This study was supported by the Urmia University of Medical Sciences (UMSU), Urmia, Iran (project no. 1579).
This study was financially supported by the Urmia University of Medical Sciences (UMSU), Urmia, Iran (Project no. 1579). The funder had no role in data collection, analysis, interpretation and presentation.
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Amini, M., Hanafi-Bojd, A.A., Aghapour, A.A. et al. Larval habitats and species diversity of mosquitoes (Diptera: Culicidae) in West Azerbaijan Province, Northwestern Iran. BMC Ecol 20, 60 (2020). https://doi.org/10.1186/s12898-020-00328-0
- Mosquito larval habitats
- Oviposition sites
- Species diversity