animal biosystematic
Articles in Press, Accepted Manuscript, Available Online from 12 November 2014
Abstract
Collection and identification snails of Dez river in Khuzestan province in Iran has been investigated in 2012-2013. For the first time, 29 snail species are identified in Dez river in Khuzestan, which they belong to 15 genera from 10 families Identification was done according to morphometric characters ...
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Collection and identification snails of Dez river in Khuzestan province in Iran has been investigated in 2012-2013. For the first time, 29 snail species are identified in Dez river in Khuzestan, which they belong to 15 genera from 10 families Identification was done according to morphometric characters including shape, size of shell, dextral and sinistral position of the shell, operculum, aperture, radula, mucus colour, respiratory pore, keel, renal ridge and reproduction system. The most and least distribution among identified snail species are 18 and 8 species belong to 4 and 2 stations respectively from Dez river, which they are 20/82 kilometers away from each other. The most commonly distributed family is Thiaridae with 8 species Melanopsispraemorsa ، Melanopsis costata ،Melanopsis doriae Melanopsis nodosa، Melanopsis subtingitana, Melanoides pyramis, Melanoides tuberculata Thiara scabra. Bulinus truncates and Lymnaea truncatula are identified as the most frequent and has medical importance.Melanopsis subtingitana Annandale,1918 and Gyraulus huwaizahensis species are reported for the first time from Iran.
Fahime Saberi; Ashraf Jazayeri; Tayebeh Mohammadi
Abstract
Amphibian are the first resident vertebrates in dry habitats that have retained their dependency to aqueous habitats and adapted to this type of life. Different habitats affect skin structure and reproductive potential of amphibians. The aim of this study was comparison of skin histology and reproductive ...
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Amphibian are the first resident vertebrates in dry habitats that have retained their dependency to aqueous habitats and adapted to this type of life. Different habitats affect skin structure and reproductive potential of amphibians. The aim of this study was comparison of skin histology and reproductive potential of marsh frog affected by geographical separation (the city as a geographical barrier) in the northern and southern regions of Khuzestan. 24 mature adult frogs were trapped and transferred to the laboratory. After identification of the target species based on the characteristics of the index, the samples were euthanized to get tissue samples. Histological sections wereprepared. In order to evaluate the reproductive characteristics, the gonadal index in males and the degree of assimilation were calculated in females. Regarding two determinant factors, the northern and southern regions of Khuzestan province, as well as back and abdominal surfaces, there was a significant difference in all measured histometric parameters (P<0.05). Differences in histometric parameters were influenced by the environmental and ecological factors. Also, based on studies, these kinds of determinants can be useful in determining the type of skin glands in different species. In comparison of reproductive potential, both sexes in the northern and southern regions have the highest reproductive capacity in spring,and male subjects with the weight and diameter of the pins, and also the subjects of the material with more weight, they had more reproductive capacity. Therefore, the spawning season of the species began in late March and peaked in the middle of the spring.
Fatemeh Fakharzadeh; Forough Seydi Avandi
Abstract
Abstract Variable toad (Bufotes variabilis) is a member of the Bufotes viridis complex in Bufonidae family. Although this species broadly spreads in the western part of Iran, few studies have been carried out on different populations of this species in Iran, especially in Khuzestan province. ...
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Abstract Variable toad (Bufotes variabilis) is a member of the Bufotes viridis complex in Bufonidae family. Although this species broadly spreads in the western part of Iran, few studies have been carried out on different populations of this species in Iran, especially in Khuzestan province. Totally 59 specimens were collected from Behbahan, Masjed Soleyman and Dehdez from June 2016 to September 2017. Analysis of variance (Anova) confirmed the separation of populations in 11 characters. The results of t-test showed no sexual dimorphism in the studied populations. The results of the discriminant analysis showed that both functions are significant. Scatter plot of canonical functions shows that according to the first function, the specimens of Behbahan are partially separated from specimens of two other regions and according to the second function, specimens of the Masjed Soleyman are clearly separated from specimens of two other regions. Overall, 89.8% of the toads were placed in their expected groups. Karyological studies demonstrate that all samples are diploid and have 2n=22. These chromosomes are classified into two groups. The first group consists of 6 pairs of large chromosomes and the second group contains 5 pairs of small chromosomes. In all samples of the three mentioned areas, 8 pairs of chromosomes are metacentric and 3 pairs of chromosomes are sub metacentric. Such karyotype pattern has been reported in many species of the genus Bufotes.
I. Gowhari; S. Molaei Birgani; Sh. Pashaei Rad; Sh. Navidpour
Volume 3, Issue 4 , July 2015, , Pages 47-52
Abstract
Abstract Scorpions are the oldest terrestrial arthropodas. Scorpions dig their nest in the ground to protect themselves and their infants from light, high and low tempreture. Regarding habitat, species, depth and the palce of digging, the nest of scorpions would be various , with due regard to the climate ...
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Abstract Scorpions are the oldest terrestrial arthropodas. Scorpions dig their nest in the ground to protect themselves and their infants from light, high and low tempreture. Regarding habitat, species, depth and the palce of digging, the nest of scorpions would be various , with due regard to the climate of Khuzestan Province and the variety of Scorpion species in this Province, investigation of Scorpion nesting behaviors is an essential issue in Scorpionology. In this research, the nesting behaviors of two types of Scorpions Odothouths bidentatus and Scorpio mauruss were examined. In this Survey, length and width of the nest entrance were measured and small models of the nests were made by means of injecting materials such as cement and chalk in these nests. After the computation of mean, Standard deviation and Standard error of measurment applying T-test and the Significance of error less than%5 , the result of measuring width and length of the entrance, different parts of the nest including initial, middle, final and length of the nest of Scorpion s under investigation were compared. To compare the parameters insides the species, nonparametric Freedman method was applied, and also to compare the measured parameters concerning physicochemical properties of Scorpion soilbed, Mann Whitney method was used.
