animal biosystematic
Fatemeh Fakharzadeh; Somayeh Horobi
Abstract
Two species, green toad (Bufotes viridis) from true toads (Bufonidae) family and Marsh frog (Pelophylax ridibundus) from true frogs (Ranidae) family have the most distribution in Khuzestan province. These species have many taxonomic problems and the chromosomal studies have been done in the country are ...
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Two species, green toad (Bufotes viridis) from true toads (Bufonidae) family and Marsh frog (Pelophylax ridibundus) from true frogs (Ranidae) family have the most distribution in Khuzestan province. These species have many taxonomic problems and the chromosomal studies have been done in the country are few. In the field studies, 28 samples of anura including 17 green toads and11marsh frogs were collected from northwest and south of Khuzestan province (Shush, Khorramshahr and Hendijan). Sampling was done between the summer of 2018 and the summer of 2019. Chromosome studies showed all green toads have 22n=22 chromosomes that were classified into two groups. The first group included 6pairs of large chromosomes and the second group composed of 5pairs of small chromosomes. In the toads of all three studied regions, the fourth and seventh pairs of chromosomes were submetacentric and the rest chromosomes were metacentric. Results showed all collected marsh frogs have 2n=26 chromosomes, which were divided into two groups. The first group included 5pairs of large chromosomes and the second group had 8 pairs of small chromosomes. The karyotype formula of the frogs of the three sampling areas are not the same. The karyotype formula of Khorramshahr, Shush and Hendijan frogs are 8m+1sm+4st, 7m+3sm+3st and 6m+6sm+1st, respectively. Sex heteromorphic chromosomes were not observed in any of the collected samples. Current study on marsh frogs and its comparison with other investigations shows a significant diversity in terms of karyotype in the country, which strengthens the possibility of the existence of a species complex.
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.
