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.
Ashraf Jazayeri; Fahimeh saberi; Tayebeh mohammadi
Abstract
Abstract
Skeletocronology is a reliable method for estimating the age but in amphibians little researches have been done in this field. In the present study, for the first time in the country of Iran, the age structure of the population, growth pattern and reproductive primary age were studied in the ...
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Abstract
Skeletocronology is a reliable method for estimating the age but in amphibians little researches have been done in this field. In the present study, for the first time in the country of Iran, the age structure of the population, growth pattern and reproductive primary age were studied in the populations of marsh frog in the northern and southern regions of Khuzestan province. For this purpose, 20 female and male marsh frog samples were fished alive in the Khuzestan province and transferred to the laboratory. After biometric studies, the specimens were prepared and after the removal of the bones of the limbs, bone samples were passaged as routine histotechnique. The number of growth stop lines and samples age were determined. In order to determine the relationship between age and body weight, body length and age with eye lens weight, the data was analyzed statistically. the maximum number of loops counted in this population is . The adult age of males of northern and southern, males of the northern and males of the southern regions was determined 2,2 and 3 years respectively. with increasing age of females, the co-integration rate of females was reduced which is explainable by the reduction in bioavailability due to the increase in biological age. According to the results, there was a significant correlation between age of animals with body and eye lens weight, but there was no significant correlation between age of animals with body length, except a limited number of males in northern regions (P<0.05) There was.
Sorour Echreshavi; Forough Papani; Ashraf Jazayeri
Volume 4, Issue 4 , May 2016, , Pages 11-17
Abstract
Abstract To identify the species, understanding the characteristics of the species, explore the possibility of speciation, mutations in the study population, and many other purposes. In this method for studying colchesin bath, karyotype use for immature worms. After reviewing the slide karyotype of polychaeta ...
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Abstract To identify the species, understanding the characteristics of the species, explore the possibility of speciation, mutations in the study population, and many other purposes. In this method for studying colchesin bath, karyotype use for immature worms. After reviewing the slide karyotype of polychaeta (Nereis sp.) and observation and analysis of 50 plaque metaphase plate chromosome number of the species found 2n=28 from all set chromosome, 14 pairs of chromosome detected 3 pairs metacentric , 9 pairs from sub metacentric and 2 pairs from telocentric. Since the samples were immature (in seasonal samples weren’t found any adult worm). The sex chromosome are not visible discernable.
