جستجوی مقالات مرتبط با کلیدواژه "پر" در نشریات گروه "محیط زیست"

According toincreased Concern about the long-term effects of heavy metals as environmental pollutants, studing showed that the bio monitoring could be desirable and satisfactory method to measure heavy metals. Feathers can play the role of both storing and eliminating metals. In this study, accumulation of heavy metals cadmium and lead in birds with emphasis on impact type of habitat (water and drought) were studied in birds in South West of Iran. Tail feathers of 29 birds belonging to 8 species (4 species of aquatic and terrestrial species 4) were collected. In this study heavy metals were measured by using Fillips PU 9400 Atomic Absorbtion Spectrophotometer. Mean Pb concentration in feather of birds was obtained between 18.23± 1.03 (Aythya nyroca) and 3.33± 1.31(μg/g) ( Merops orientalis). Alse mean of Cd in birds was obtaine between 1.71± 0.06 (Anas platyrhyncho) and 0.06± 0.03(μg/g) (Merops orientalis). For evaluation of effects of habitat type on level of lead and cadmium on feather, the birds studied in two groups (aquatic and terrestrial birds).The mean of Pb in aquatic and terrestrial birds were 11.94±4.95 (μg/g) and 6.81±1.03 (μg/g) respectively. A significant difference was in feather Pb concentration across aquatic and terrestrial birds.The concentration of Pb in feathers of aquatic birds was higher than terrestrial birds. The mean of Cd concentrations in aquatic and terrestrial birds was obtained 1.08±0.73 (μg/g) and 0.25±0.19 (μg/g) respectively. However Cd concentration in aquatic birds were higher than terrestrial birds, but there was no significant difference between Cd concentrations in aquatic and terrestrial birds.

Natural mineral layers are composed of large amounts of heavy metals which are released into the nature during the mining process. Birds will be exposed to heavy metals by direct contact, contaminated food and water and even swallowing the gravels and digesting them in their gizzard. The aim of this study was to evaluate the concentration of cadmium in eathers of Alectoris chukar in Ahangaran mine and the impact of factors such as age, sex, and tissue on accumulation of heavy metals.
In this study, samples of breast and tail feathers from 9 samples in mining region and from 3 samples in control region were taken. Atomic absorption spectrometry, model SpectrAA 400, was used to measure the accumulation of heavy metals.
Findings: The results indicate that the average cadmium concentration measured in feathers of Alectoris chukar in the mineral-rich region was 2/18 μg/g, whereas this average in the control region was 0/54 μg/g. Comparisons showed that in the mining region the concentration of cadmium was slightly higher than the standard level and in the control regions it was lower than the standard level. However, this difference was not significant. Effects of type of region (mineral and non-mineral) and age (adult and immature ( on the accumulation of cadmium in the feather of Alectoris chukar were significant, but the effect of gender (male and female) was not significant.

According toincreased Concern about the long-term effects of heavy metals as environmental pollutants, studing showed that the bio monitoring could be desirable and satisfactory method to measure heavy metals. Feathers can play the role of both storing and eliminating metals. In this study, accumulation of heavy metals cadmium and lead in birds with emphasis on impact type of habitat (water and drought) were studied in birds in South West of Iran. Tail feathers of 29 birds belonging to 8 species (4 species of aquatic and terrestrial species 4) were collected. In this study heavy metals were measured by using Fillips PU 9400 Atomic Absorbtion Spectrophotometer. Mean Pb concentration in feather of birds was obtained between 18.23± 1.03 (Aythya nyroca) and 3.33± 1.31(μg/g) ( Merops orientalis). Alse mean of Cd in birds was obtaine between 1.71± 0.06 (Anas platyrhyncho) and 0.06± 0.03(μg/g) (Merops orientalis). For evaluation of effects of habitat type on level of lead and cadmium on feather, the birds studied in two groups (aquatic and terrestrial birds).The mean of Pb in aquatic and terrestrial birds were 11.94±4.95 (μg/g) and 6.81±1.03 (μg/g) respectively. A significant difference was in feather Pb concentration across aquatic and terrestrial birds.The concentration of Pb in feathers of aquatic birds was higher than terrestrial birds. The mean of Cd concentrations in aquatic and terrestrial birds was obtained 1.08±0.73 (μg/g) and 0.25±0.19 (μg/g) respectively. However Cd concentration in aquatic birds were higher than terrestrial birds, but there was no significant difference between Cd concentrations in aquatic and terrestrial birds.

Mercury is a toxic heavy metal and is stable in the environment which can enter the living organisms through various ways. Bioaccumulation of mercury in birds has several impacts including nephron toxicity, kidney lesions and can lead to bird death. In the current studybioaccumulation of mercury was investigated in kidney, liver and tail feathers of 40 birds collected at three sites in Isfahan province belonging to three bird orders: Charadriiformes, Passeriformes and Columbiformes. Mercury level in tail feather, liver and kidney of aquatic birds averaged at about 4290, 3056 and 2704 ppb respectively and significantly (p < 0.05) higher than the mercury amount in the same organs (770, 816 and 519 ppb) of terrestrial species. In aquatic birds, tail feather with the average amount of 4290 ppb and in non aquatic birds, liver with the average of 816.64 ppb showed the highest amount of mercury. Charadriiformes had significantly (p = 0.0001) higher amount of mercury in their organs compared to the other two orders. Among the bird's families, Sternidae and Laridae showed significantly higher amount of mercury in their organs. The results can be an indicative of mercury presence in the Zayandehroud River, therefore it is necessary to monitor and manage heavy metals in the river.

Mercury and organic compounds are the most toxic substances for aquatic ecosystems. In the this study, feasibility using of western reef heron feathers as bio-indicator of mercury contamination in the Hara International Wetland. Accumulation of mercury were investigated in body and wing feathers in this species. Furthermore, we evaluated factors influencing mercury levels such as sex and morphometric parameter in the mentioned species. The analyses were carried out using advanced mercury analyzer (AMA 254) according to EPA 7473 method. There were no significant differences between body and wing feathers in Hg concentration in this bird (P>0.05). Results showed that morphmetric parameters such as weight, length and wing length and also sex have no significant effects on total Hg accumulation in this bird. Mercury levels in feather were below the threshold of 5–15mg kg–1 that may affect birds. Results also showed the low bioaccumulation of Hg in the Hara Wetland ecosystem is not so critical. Accordingly, we recommend that the western reef heron can use as a biomonitoring of mercury pollution in this region.