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Larval Habitats and Species Diversity of Mosquitoes

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Larval Habitats and Species Diversity of Mosquitoes Amini et al. BMC Ecol (2020) 20:60 https://doi.org/10.1186/s12898-020-00328-0 BMC Ecology RESEARCH ARTICLE Open Access Larval habitats and species diversity of mosquitoes (Diptera: Culicidae) in West Azerbaijan Province, Northwestern Iran Mojtaba Amini1,2, Ahmad Ali Hanaf‑Bojd3, Ali Ahmad Aghapour4 and Ali Reza Chavshin1,5* Abstract Background: The characteristics of a larval habitat is an important factor which afects 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 col‑ lected from 22 natural habitats in fve 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 afnity between the collected species was calculated using Fager & McGowan test. Results: A total of 2715 specimens were collected and identifed. Seven diferent species belonging to four genera were identifed 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 maculipen- nis Meigen 1818complex, and Aedes caspius Pallas 1771. There was a signifcant diference in chloride content and water temperature preferences among the diferent species (P < 0.05). Also, there was no signifcant diference in pH, Alkalinity, Turbidity, TDS, and EC preferences among the diferent species (P > 0.05). The afnity between the pair of species Cx. mimeticus/Cs. longiareolata was 0.526. There was no afnity between other pairs of species or the afnity was very weak. Conclusions: 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. Keywords: Mosquito larval habitats, Oviposition sites, Species diversity Background Te breeding pattern and population growth of medically important mosquitoes are afected by the physicochemi- *Correspondence: [email protected] cal characteristics of their habitats. Breeding pattern and 1 Department of Medical Entomology and Vector Control, School of Public Health and Social Determinants of Health Research Center, population growth surveillance is essential in designing Urmia University of Medical Sciences, Urmia, Iran mosquito control programs [1]. Monitoring mosquito Full list of author information is available at the end of the article larval habitats and population growth pattern, in the © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creat iveco mmons .org/licen ses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creat iveco mmons .org/publi cdoma in/ zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Amini et al. BMC Ecol (2020) 20:60 Page 2 of 11 form of studies to identify the characteristics of the habi- Also, the environmental changes driven by urbani- tats, can provide valuable information on mosquitoes’ zation and agricultural and industrial projects afect population growth levels, species diversity, and breeding mosquito species’ diversity. Biodiversity and related sites for Integrated Vector Management (IVM) [2]. important changes in geographic ranges of mosquitoes Vector control programs rely on the thorough knowl- are of medical and veterinary importance, because any edge of the ecology and population dynamics of mosquito distributional shifts could alter and expand the range of species, as well as the epidemiology of mosquito-borne mosquito-borne diseases [17–19]. diseases. Terefore, research on vector habitats must be Te West Azerbaijan Province in the northwestern stepped up so that mosquito control programs could be Iran is an important biogeographic region which shares a carried out on sound bases [3]. common border with four countries; Armenia, Azerbai- Te factors which afect mosquitoes’ oviposition site jan, Iraq, and Turkey. Tese countries are endemic areas selection, also play a crucial role in larval density and for a variety of mosquito species due to the presence species composition [4, 5]. In recent years, the suitable of various environmental and geographical conditions temperature [6, 7] and pH range [6] for the presence and favorable for the breeding of mosquitoes [20–23]. Conse- abundance of larval species of mosquitoes have been quently, there is a high diversity of mosquito species and studied and identifed. Also, a direct correlation between spread of mosquito-borne diseases in the West Azerbai- the distribution of medically important mosquito species jan Province [24–26]. Also, this province is well-known and physicochemical properties of their habitats, includ- for its abundant water resources and wetlands for migra- ing temperature, ammonia, nitrate, pH, dissolved oxygen, tory birds from around the world [27, 28]. and salinity has been reported by previous studies [8, 9]. By identifying the characteristics of larval habitats In diferent regions of the world, the infuence of phys- and species diversity of mosquitoes, the prospect and icochemical properties of mosquito larval habitats on the possibility of mosquito borne diseases in a particular production of emergent mosquitoes [10], their body size geographical area could be determined with higher pre- [10], and embryonic development and adult ftness [11] cision, and consequently, integrated vector manage- have also been studied. Moreover, it has been reported ment can be implemented with guaranteed success. Te that the spatiotemporal patterns of mosquito produc- specifc geographical location of the West Azerbaijan tion could be infuenced by variation in the properties Province, its remarkable climatic diversity and abundant of breeding sites, which are important determinants of water resources [27], as well as the presence of a variety growth and survival of larval populations. Tus, the iden- of mosquitoes and history of mosquito-borne diseases tifcation of these factors is essential for developing con- in this area has attracted the attention of public health trol strategies for mosquitoes [10]. research in recent years. Te present study aimed to Worldwide, as well as in Iran, there has been greater investigate (1) some of the physicochemical properties emphasis on the study of malaria vectors, however, most of mosquito larval habitats (temperature, pH, turbidity, of the studies have focused on the infuence of these Chloride, Alkalinity, TDS and EC), (2) possible correla- physicochemical factors on malaria vectors [4, 12–14]. tion between the physicochemical parameters and the Only few studies have focused on the infuence of presence of mosquito species, and (3) species diversity, these factors on mosquito larvae. In a previous study co-occurrence and afnity index between pairs of mos- which investigated the efects of physicochemical char- quitoes species. Te results of this study would be useful acteristics of larval habitat waters on a broader range in determining the environmental and biological factors of mosquito genera, there was no signifcant diference of the larval habitats of mosquito vectors. in temperature, pH, turbidity, electrical conductivity (EC), total dissolved solids (TDS), alkalinity, total hard- Methods ness, calcium, chloride, fuoride, nitrite, nitrate, phos- Study area phate, and sulphate content of the larval habitat water Te West Azerbaijan Province is located in the north- among the diferent mosquitoes species in Qom Province west of Iran between latitudes 39° 46´- 35° 71 58´ N and in the central part of Iran [15]. In another study, a posi- longitudes 44° 3´- 47° 23´ E. Tis province shares bor- tive correlation between the larval abundance of Cx. pipi- der with 4 neighboring countries: Armenia, Azerbaijan, ens and the physicochemical characteristics of the larval Iraq, and Turkey (Fig. 1). Tis area is characterized by habitat including EC,
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