Bigleri Quchan Atiq Fatemeh; azita farashi; Mitra Shariati Najafabadi
Abstract
Migratory species move on their migration path in a wide range of environments, but their dynamic response to the environment and how migratory birds choose their habitat has rarely been considered. Due to the need for studies in this field, the present study was conducted to investigate the distribution ...
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Migratory species move on their migration path in a wide range of environments, but their dynamic response to the environment and how migratory birds choose their habitat has rarely been considered. Due to the need for studies in this field, the present study was conducted to investigate the distribution and environmental parameters affecting the habitat selection of white-fronted goose (Anser albifrons, Scopoli 1769) as a migratory species in Iran.In this study, four groups of environmental variables including: topographic, climatic and land use / land cover variables were used. Points of presence were obtained using reports from the Environmental Protection Agency. For modeling, 9 algorithms in BIOMOD package under R software were used. The accuracy of modeling was evaluated using ROC and TSS indices. The results showed that parameters such as annual rainfall, distance to rainfed fields, rainfall in the warmest season and distance to wetlands have the greatest impact on the distribution of white-fronted goose. Also, the validation results showed that the models used in this study have high accuracy in modeling the distribution of species. The proposed method in this modeling can increase how researchers understand the distribution and habitat selection to provide management and conservation solutions for species.
somayeh sargolzaei; azita farashi; Omid Safari; hamidreza ahmadnia motlagh
Abstract
Kardeh River is one of the most important permanent rivers of Khorasan Razavi province Which supplies a large part of Mashhad's drinking and agricultural water. Multivariate analysis was used to find out the quality of Kardeh River in this study and to understand the impact of macroinvertebrates community ...
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Kardeh River is one of the most important permanent rivers of Khorasan Razavi province Which supplies a large part of Mashhad's drinking and agricultural water. Multivariate analysis was used to find out the quality of Kardeh River in this study and to understand the impact of macroinvertebrates community structure drivers on ecosystem management. For this purpose, macroinvertebrates sampling was performed from four study stations during four seasons in 2018-2019, physical and chemical parameters also were measured. In this study, Of the Ephemeroptera, the total number of Caenidae and Baetidae families had the highest abundance (66 / 60 %). The results showed that the Index of Biotic Integrity varied from 3 to 1.1 and based on this biodiversity indicator, Kardeh River water quality was classified into three relatively good, poor and very poor quality classes. The Stream Invertebrate Grade Number Average Level index was classified into two categories: moderate pollution and severe pollution. Canonical Corrspondence Analysis also showed that nitrate, biochemical oxygen demand and chemical oxygen demand had the most effect on the distribution of macroinvertebrates at the study stations. In general, the Kardeh River water quality was poorly evaluated and among the study stations the station conditions were relatively better than the other stations. Therefore, among the available indices, multimetric indices are more reliable. However, these index should be calibrated according to the conditions of Iranian rivers.
