List of articles (by subject) Animal environment
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Open Access Article
1 - New dominance of planktonic groups in the southeastern part of the Caspian sea
niloufar norouziAn ongoing ecological study of the Caspian Sea, in a particular distribution, identifying the species composition and regional variations, seems to be necessary before any study. According to this, in the present study, the type of dominance of planktonic groups in sout MoreAn ongoing ecological study of the Caspian Sea, in a particular distribution, identifying the species composition and regional variations, seems to be necessary before any study. According to this, in the present study, the type of dominance of planktonic groups in southeastern basin of the Caspian Sea (Golestan Province) was studied. For this purpose, sampling of planktonic groups was done once in September 2015 with 3 repetitions. The results of phytoplankton study showed that there are 4 orders, 4 families and 4 genera in the study areas, which constitute Euglenophyta (Euglena sp. 99.9% density), Dinoflagellata (Procentrum sp. 99.5% density) and Bacillariophyta (Diatum group. 100% density), the main phytoplanktons flora of the ecosystem, respectively. The Genus Euglena is the index of hypertrophic waters and is the first time that has been seen predominantly in the studied basins. The results of zooplankton study also indicate the destruction of this planktonic group (only 1 zooplankton of the species Keratella cochlearis from the genus Rotifera was observed), which is mainly due to the toxin produced by Euglena and the anaerobic conditions in the ecosystem. In general, the results indicate a critical quality status of the studied areas, the loss of high amounts of living fauna and flora and the dominance of toxic and inappropriate planktonic groups in the ecosystem. Manuscript profile -
Open Access Article
2 - Effect of using dill (Anethum graveolens) whole plant powder on performance of some blood parameters, and skeletal system of broilers
ali Reyan Mohasesi Hasan Darmani Koohi Reza Naseri Harsini Hamed Kioumarsi هوشنگ دهقان زادهTo investigate the effects of the whole dill plant powder different levels on performance of some blood parameters and tibial characteristics of broilers, 200 one-day-old male chicks (Ross-308) were used in a completely randomized design with four treatments and five re MoreTo investigate the effects of the whole dill plant powder different levels on performance of some blood parameters and tibial characteristics of broilers, 200 one-day-old male chicks (Ross-308) were used in a completely randomized design with four treatments and five replicates (10 chicks per replicate). Chicks were randomly distributed among the experimental treatments including 0, 0.5, 0.1, and 0.2% levels of whole dill plant powder. In regards to feed intake and weight gain during the entire growing period, the treatments contained 1% and 2% of dill plant powder had the highest and the lowest feed intake, respectively, and treatments containing 0.5% dill powder and control group were in the middle of the first two treatments (P<0.05). In terms of feed conversion ratio, the only significant difference observed between treatments throughout the entire experimental period was a significant increase in the amount of feed conversion ratio in the chicks treated with 2% dill plant powder. Serum alkaline phosphatase concentration showed a significant increase in both assessing periods (21 and 42 days) for the 2% dill plant powder treatment compared to the other experimental treatments (P<0.05). Serum calcium and phosphorus concentrations were not affected by experimental diets. The weight, length, width, and ash percentage of the tibial bone did not show any significant difference between the experimental treatments. The results of this study showed that using 1% of dill plant powder in broiler chicken diets, while improving growth performance, did not have any adverse effect on skeletal growth and development of chickens. Manuscript profile -
Open Access Article
3 - Investigation of birds' density and species diversity of Amir-Kelayeh international wetland during a 10-year period (2007-2016), based on winter census
Hadi Pourmosa shaykhAlikelayeh Saeid NaderiAmir-Kelayeh international wetland is as one of the important wintering habitats for birds. In present study, the density and diversity of bird species (waterbird, wader and terrestrial bird dependent to the wetland) has been studied in Amir-Kelayeh international wetlan MoreAmir-Kelayeh international wetland is as one of the important wintering habitats for birds. In present study, the density and diversity of bird species (waterbird, wader and terrestrial bird dependent to the wetland) has been studied in Amir-Kelayeh international wetland based on the semi-winter birds census data, over a 10-year statistical period. During this ten-year period, the total number of 334776 birds from 46 different birds species was recorded in this wetland. Among the studied years, the highest number of 72188 birds in 2008 and the lowest number of 1877 birds in 2015 have been counted. In terms of quality and food items, this wetland and it's around paddy fields is a good refuge for the Anatidae and Rallidae family that with 64.86 and 50.06 percent of frequency depending on their diet, have the most abundant among the identified family. The biodiversity indexes showed a relatively high amounts, but with a declining trend, and also the index of species evenness indicated a stable trend during this 10-year period in Amir-Kelayeh Wetland. Considering the decreasing trend of biodiversity indexes in Amir-Kelayeh wetland in recent years, increasing the wetland ecological conservation through the management plans such as habitat structure conservation, and illegal hunting and pollution control is recommended. Manuscript profile