علوم زیستی دریا
Abdolsamad Dehghan; Ahmad Savari; Tooraj Valinassab; babak Doustshenas; Parvin Sadeghi
Abstract
To study the effects of monsoon on the richness and seasonal changes in the density of crabs in the intertidal area of the southern coast of Sistan and Balouchestan province, sampling was carried out in 2013 (based on the intensity of the monsoon) in three seasons: pre-monsoon, monsoon and post-monsoon ...
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To study the effects of monsoon on the richness and seasonal changes in the density of crabs in the intertidal area of the southern coast of Sistan and Balouchestan province, sampling was carried out in 2013 (based on the intensity of the monsoon) in three seasons: pre-monsoon, monsoon and post-monsoon using quadrats (Dimensions 50x50 cm and depth 10 cm), in 5 different stations. During the research, organic matter, salinity and temperature were also measured. Altogether, in this study, 17 species belonging to 10 families and 15 genera were identified. Based on the two-way ANOVA analysis results, a significant difference in brachyuran crab density and diversity was observed between the three seasons. The lowest species richness and density between the three seasons were recorded during the monsoon due to environmental stress. On the other hand, due to the presence of favorable environmental conditions for crabs, the highest density and species richness were observed in the prior and post-monsoon seasons. The statistical comparison of density in different stations showed that due to the significant relationship between density, grain size, and other environmental conditions, Jazireh Krahang and Gowater stations have the highest amount of TOM throughout the year, the presence of mud substrate and mangrove ecosystem has the highest species richness and density. In contrast, the lowest density has been recorded at Tiss and Bris. Monsoons can affect the ecology of living organisms differently. Totally, Monsoons can cause a decrease in the density and abundance of crabs during monsoon season in the intertidal zone due to their extensive effects on environmental conditions such as the content of organic matter and substrate conditions.
Abstract
The Study of Petrochemical Industries Sewage Effects on the Water Quality in Khor Musa Abstract Imam Khomeini petrochemical complex is situated at the northwest part of the Persian Gulf where discharged its sewage to the seawater.Samples were collected using Van Dorn sampler, bimonthly from four ...
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The Study of Petrochemical Industries Sewage Effects on the Water Quality in Khor Musa Abstract Imam Khomeini petrochemical complex is situated at the northwest part of the Persian Gulf where discharged its sewage to the seawater.Samples were collected using Van Dorn sampler, bimonthly from four sites during December 2009 to May 2010. The seawater physicochemical parameters such as DO, pH, BOD, total ammonia, total phosphorous and turbidity were measured and among them, BOD (5.05ppm), total ammonia (2.51ppm) and total phosphorous (0.3ppm) showed higher than standard values. Based on water quality scoring (WQS), all sites showed 2.66 values which classified as bad water quality. During this study, BOD, total ammonia and phosphorous showed significantly (p
shafa hoveizavi; hossein pasha zanusi
Abstract
Ecological health is the most important component of the biological health. Macrobenthos invertebrate are the most important organisms in aquatic ecosystems that are used for determination of biological health. Benthic indices base bye data simplifying and shows a set of biological variable as a quantified ...
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Ecological health is the most important component of the biological health. Macrobenthos invertebrate are the most important organisms in aquatic ecosystems that are used for determination of biological health. Benthic indices base bye data simplifying and shows a set of biological variable as a quantified variable that made the interpretation of data easier, one of this indices is BOPA index that give from ratio of opportunistic Polychaeta to Amphipoda. The higher value of this index shows environmental pollution. The value of BOPA index showed significant difference between stations(p