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.
Haji Gholi Kami; Hajar Selavar Sheyda Jalali; Hamidreza Jamalzadeh; Gholamreza Hosseini Khaleh Jir
Volume 6, Issue 2 , December 2017, , Pages 65-73
Abstract
Colour pattern polymorphism is more hereditary and subject to selection. Most of anuran species showed significantly colour or dorsal pattern polymorphisms, thus provide a very good system in which to survey questions pertaining to the evolution and maintenance of polymorphisms. 25 species of anuran ...
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Colour pattern polymorphism is more hereditary and subject to selection. Most of anuran species showed significantly colour or dorsal pattern polymorphisms, thus provide a very good system in which to survey questions pertaining to the evolution and maintenance of polymorphisms. 25 species of anuran amphibians presented that they have been seen in color polymorphism and Rana (Pelophylax) genus have the most variety. In most anurans, polymorphism is caused by the presence or absence of spots on the back of their bodies. Color variations can include skin of the whole body or part of It,s. In this research for the survey of polymorphism marsh frog Pelophylax ridibundus, dring six month of field work in the sampling areas (since March 2013 to August 2013), 200 specimens were collected from six stations (Astaneashrafiye, Siyahkal, Lahijan, Langerood, Roodsar and Amlash) in east of Guilan province. Sampling carried out using the handle tour. Samples were transferred alive to the zoology lab of Tonekabon Branch, Islamic Azad University, Then different morphs and their characteristics were recorded, based on the number and location of spots, presence or absence of the mid dorsal stripe and the amount of green in the back, out of 25 morph were identified, That it variety could be due to ecological factors, to escape from the hunter or the prey or due to genetic factors.
