نشریه زیست شناسی کاربردی
سال بیست و چهارم شماره 1 (بهار و تابستان 1390)

For assessment of polychaete in Lengeh port, seasonal sampling done by using 2 transect of intertidal zone and 3 stations in each transect, during one year from October 2008 until July 2009 (quadrate size was 0/25m2 and sampling depth was 30-40 cm). Results of polychaetes numeration was showed that maximum number was in February and minimum number was in May. The Calculation of stability index (SI) of different groups, showed that opheliidae family is permanent group and spionidae family is temporary group and other groups are accidental.Results showed that salinity, organic matter and the kind of sediment are effective factors on abundance of polychaetes in this region.

Soil and water salinity are among the most serious yield reducer of crop production across the West Asia and North Africa region. The purpose of this study was to determine salinity tolerance of 103 genotype of Kabuli chickpea core collection of NPGB of Iran. Initially salinity tolerance threshold of genotypes were determined based on selection of randomly sampled seeds of the genotypes. Randomly sampled seeds were cultured on 0, 60, 120, 180, 210, 240 and 300 mM NaCl in a factorial experimental design with three replications on filter paper. Based on radical and plumule length reduction as an indicator of seed vigor, the concentration of 120 mM NaCl considered as a threshold dose of salinity tolerance of the genotypes at germination stage. Then, salinity tolerance of the whole under study accessions at germination phase have been investigated using 120 and 180 mM of NaCl solution and distilled water as control treatment. This experiment was conducted as Completely Randomized design with 3 replications. Although results showed reduction in germination percentage and rate, radical and plumule length, fresh and dry weight under salt treatments, but different genotypes responded diversely to applied salinity treatments. Principle component analysis and bi-plot graph display, based on total dry weight production under salt treatments, and percentage of plumule and radical length reduction in comparison with control treatment indicated that, genotypes number 216189, 215280 and 215995 are surrogate genotypes and have more salinity tolerance from others at germination stage.

Chara (Chara vulgaris) and Najas (Najas felexilis) are two submersed weeds which are found in rich waters. The excessive growth of these plants cause the reduction in utilization of water resources and making some ecological and economical damages in these areas. In most fresh water systems, such as wetlands, streams and lakes, the efficacy of mechanical methods is well documented for major weed species. The aim of this study was to determine the response of C. vulgaris and N. felexilis to cutting in three levels (once, twice and without cutting) in Azadegan lake park of Tehran. The test was examined in factorial design with three replications. The tested parameters included plant length and dry weight. The results of this experiment showed that once cutting in comparison with control treatment, made 43/75 and 13/8 percent reduction in length of C. vulgaris and N. felexilis, respectively. Also, twice cutting compared with only once, caused considerable (P≤0.05) reduction in growth of test plants. Thus, cutting and its replication, because of creating more stress and reduction in carbohydrate stock, brought about a better control effect on test plants.

Hawthorn (Crataegus L.) belongs to Crataegeae tribe, Maloideae subfamily and Rosaceae family. It has about 150 – 1200 species in the world. In this study, revision of two species C. meyeri and C. persica was investigated in Iran, by using morphology of different organs and micromorphology of pyrenes. Results indicated that species C. persica reported from west and central of Iran, is synonym of species C. meyeri, this result was concordant with monograph of Crataegus.

In this work the effect of Lactobacillus rhamnosus and black seed (Nigella sativa) powder was studied on growth and feeding parameters of rainbow trout. The feeding treatments used were (1) rainbow trout commercial diet (control), (2) commercial diet supplemented with Lactobacillus rhamnosus (108 CFU/Kg feed), (3, 4, 5) commercial diet supplemented with the same probiotic bacteria and 25, 50 and 100 g black seed powder/Kg feed respectively. 900 rain bow trout fingerlings (average wt. 36g) were cultured in 15 concrete tanks containing 400 L underground well water for a period of 60 days. The fish were fed three times every day to apparent satiation. Maximum weight gain, standard length, specific growth rate, feed efficiency ratio and daily feed intake and minimum feed efficiency rate (FCR) were observed in group fed on feed containing probiotic bacteria and 25 g black seed/Kg feed compared to the control and the fish received 100 g black seed in their feed (P < 0.05). It was concluded that supplementation of 108 CFU Lactobacillus rhamnosus and 25 g black seed powder/Kg feed can positively influence the growth and feeding parameters of rain bow trout.

Homocysteine is a homologue of the amino acid cysteine differentiated by an additional methylene, consists of sulfur and biosynthesized from methionine via a multi-step process. The aim of this study was to investigate the effect of endurance exercise on plasma homocysteine and lipid profile in rats. Twenty Wistar rats age 16 weeks (20 ±230 g) were obtained from Pasteur Institute of Iran. The rats were divided into test and control groups. The training protocol was consisted of running on treadmill 1h/day, 5 days per week/wk for a period of 10 weeks. The intensity of exercise was 28 meter in minute (about 70 to 75 VO2 max). At the end of the experiment, (food withheld overnight). Twenty four hours after the last training period, blood sample were collected and biochemical parameters were analyzed. The significance of differences between biochemical parameters in groups was measured by one-way analysis of Variance. The relationship between tHcy and lipid profile was investigated by Pearson correlation.The results showed that, tHcy decreased compared to control however, it was not significant. The HDL-C and TG changed significantly (P<0.05). The LDL-C and TC differ among groups however it was not significant. There was no significant relation between tHcy with selected lipid and lipoprotein profile. Lack of correlation with lipid and lipoprotein variables was likely due to presence of independent risk factors in formation and development of cardiovascular disease.

In this study the population structure of zooplankton and phytoplankton, with the parameters affecting primary production and the trophy status of the phosphate solution (PO4-3) and total phosphorus (TP), nitrate (NO3-), total nitrogen (TN), total suspended solids (TSS), depth water transparency (SD), The TN / TP, Percent dissolved oxygen saturation Hypolimnion area (% DO) were studied during one year period at three stations. The study also examined the status of the circulating water. Therefore, the parameters of temperature and dissolved oxygen concentration over a period of one year in three stations and at various depths were measured at the deepest station. According to surveys taken Valasht Lake (Monomectic) and all around (Holomectic) determined that in order to use the relationship between the percent area Hypolymnion Brmyk, in spring and summer, % 57/2 was calculated.. The mean density of zooplankton in the lake during the year was 10,086 per m3. The average density of phytoplankton in the lake during the year was 276,967 per liter.. Bramick relationships based on this study, the potential production of 241/2 gr of carbon per square meter per year and potential fish production of 28/19 kg per hectare per year respectively.