|
|
|
 |
Search published articles |
 |
|
Showing 6 results for Benthic
Babak Moghaddasi, Seyedmohammadbagher Nabavi, Seyed Mohammadreza Fatemi, Gholamhossein Vosoughi,
Volume 1, Issue 1 (12-2009)
Abstract
Saeed Yadollahi, Maryam Shapouri, Abolghasem Kamali, Abbas Esmaeili Sari,
Volume 2, Issue 4 (3-2011)
Abstract
Sonbolrood river originates from the springs of Kalij village mountains located in Savadkooh region in geographical situations of N:36" 18' 877 and E: 52" 49' 384, and finally , joins Babolrood river , which is one of input branches of south basin of the Caspian Sea. Geographical situation of this region is N: 36" 20' 15 and E: 50" 24' 550. Sonbolrood River located in Savadkooh region was assessed with the aim of a better understanding of benthic invertebrates' roles in self- biofiltration resulting from sewage entrance. Consequently, 4 stations were selected among 8 stations according to the pre-sampling program. Sampling started in autumn 2009 and ended in summer 2010.Generally, Sonbolrood river benthoses consisted of 3 branches of arthropods and wide worms along with 3 classes, 6 orders and 14 families of mollusca. The maximum diversity and distribution were in autumn and the minimum were in summer at all the stations.The fourth and the third stations showed the maximum and the minimum diversity and distribution. The water quality of Sonbolrood river was assessed for all the stations except station 3 ,based on Hisenov water quality guideline.Sonbolrood river was a wholly decent ecosystem for aquatic organisms due to having an extreme steep, stony-sandy bed and doing self-biofiltration. The increase of organic substances and the sewage of the factory located in an industrial complex at station 3 ,the increase of water contamination resulting from culturing warm-water fish in the soil dam of Sonbolrood river and the entrance of the adjacent village home sewage such as Seyedkala village and Sirdarkala,caused the increase of pollution and trophy of the benthoses resistant to the pollution and influenced on benthic communities.
Mohammad Borhani Jeloodar, Aboulghasem Abolghasemesmaeili Fereidouni, Seyyed Mohammad Bagher Nabavi ,
Volume 5, Issue 2 (7-2013)
Abstract
For studying seasonal variations, density and biomass of macrobenthic fauna, samples were collected seasonally along three different depths (5, 10 and 15 m) in three transects (9 stations) using grab sampler in shallow water coasts of the Caspian Sea, and three stations in the estuary of Babolroud River at Baboolsar coast during 2007-2008. Crustaceans, bivalve and polychaetes were the dominant groups in different seasons in depths of shallow water coasts but in estuary stations, bivalve and crustaceans were dominant in different seasons. Density and biomass of macrobenthic animals increased with increase of depth to 15 m due to higher organic matter loads and decreasing of grain sediment ingredients. Grains sediment and water depth were the two main factors in distribution and biomass of macrobenthic groups in sea stations. However, in estuary stations, the salinity of water was the most important parameter affecting on the density and biomass of macrobenthos. Obtained results recommended that the estuaries region of Babolroud River has lower macrobenthic groups compared to shallow water coasts of the Caspian Sea, but the latter had higher density and biomass.
Ali Ghanavati Asl, Seyed Mohamad Bagher Nabavi, Maryam Mohammadi Roozbahani, Sima Sabzalipour, Seyyed Masoud Monavari,
Volume 13, Issue 3 (9-2021)
Abstract
In this study, the diversity, composition, abundance and species density of macrobenthic communities in Nayband Bay (Persian Gulf) have been investigated. Sampling was done from 20 stations in winter of 2018. The aim of this study was to investigate the composition of macrobenthic groups in different parts of Nayband Bay. From each station, 4 sediment samples with 3 replicates, totally 60 ones using Van Veen Grab to investigate and identify macrobenthos were collected. Identification of macro benthos and other experiments, according to MOOPAM standard, were carried out in the trusted laboratory of Environmental Organization. The data was analyzed by special ecological software (Biodiversity Pro 2, PRIMER 6) and common statistical ones (SPSS 22). In the whole stations, totally 49 different taxon (genus and species) belonging to 39 families and 8 classes of macro benthos were identified. The class of Polychaeta, including 23 taxon, had the most diversity. After the group, Malacostraca, Bivalvia, Gastropoda and other phylum and classes (Echinozoa, Holuthroidea, Insects) with the least one taxon are ranked. The average dispersion of macro benthos in the studied area was determined 1741 ± 130.77 ind/m2. The maximum value of dispersion was reported 2798 ± 70/20 ind/m2, in the station near Nayband cape and the minimum one was recorded 489.7 ± 2.64 individual/m2, in Assaloye Station. Since the majority of polluted stations were located in the vicinity of Assaluyeh region and the data obtained from pollutants measurement, a kind of pollution gradient and flow from the facilities of South Pars Energy Special Economic Zone to the inside of Nayband Bay can be shown with probability. Very high claimed that the pollution of industries located in the South Pars region is the main factor in the changes of macrobenthic communities in Nayband Bay and therefore taking corrective measures can prevent the destruction of this valuable ecosystem.
, , ,
Volume 13, Issue 4 (1-2022)
Abstract
This study aimed to evaluating water quality of Shadegan wetland using Benthic Index of Biotic Integrity (B-IBI) of macrobenthos communities. This study was conducted in the spring and summer 2012 in Shadegan wetland. According to the source of pollutants and impact on ecosystem health, 6 stations were selected. Sampling was conducted from sediment samples with four replications using Peterson grab with a surface area of 225 (cm2) was used. From each station ,3 sediment samples for the isolation and identification of benthic macro invertebrates and one sample for grain size analysis and organic matter in sediments measure was taken.Total organic matter and grain size were measured by ignition loss method and sieve method respectively. Physicochemical parameters of water such as temperature, dissolved oxygen, salinity, pH ,EC were taken in three times at each stage. During the two seasons sampling, totally 16 species of 5 class macrobenthos were counted and identified. Among the identified group Gastropoda (% 93/79) and then Bivalvia (%5/35) were the most common between two seasons. In this study, B-IBI index 10 criteria were used. The results of B-IBI statistical analysis show that in spring ,station 4 and in summer stations 3 and 4 with the other stations were significant difference (P< 0/05). Comparison of mean B-IBI in two seasons show significant difference (P<0/05). Based on the results of B-IBI index, the water quality of the stations in the two seasons of spring and summer was in the quality category of high damage. Finally, the results of this study showed that Shadegan wetland has been affected by pollution caused by human activities. Therefore, it seems that the application of coherent management laws and proper education of the people of the region can be very effective in improving the condition of this wetland.
Mehran Moslemi, Majid Safari Arabi, Morteza Sharifi, Ali Barzegar,
Volume 14, Issue 3 (9-2022)
Abstract
Population changes of the macrobenthic communities were estimated in four stations scattered from Chapkrud to Miroud (Joybar, southern coastal areas of Caspian sea) during October 2018 to April 2019 at 10m depth. The amount of catch per unit effort of blades in 2018 has varied from 66 to 432 kg per blade without any significant differences with those catch efforts at 2016 and 2017. Benthic samples were analyzed taxonomically to the family level as well as their abundance as biomass size. Biomass distributions of benthic communities ranged from 1.57 to 65.78 g / m2 with an average of 13.97±1.6. Highest biomass sizes were observed for the Madani fishing net. Statistical analysis using Kruskal–Wallis test showed significant differences of the benthos abundances and biomass sizes between the stations (P< 0.05). Three out of 12 distinguished benthic families including Corophidae and Tubificidae and Cumacea are estimated to have highest abundance and biomass size. Whereas, those of the families Scrobicularidae and Cardidae had the highest biomass sizes despite having low abundances. Statistical analyzes by the one-way ANOVA method revealed significant differences existing between the abundances and biomass sizes of the benthos samples through the given 6 months fishing seasons (P<0.05). It seems that coastal fishing would decrease macrobenthic population of the southern coastal areas of Caspian Sea during the fishing periods.
|
|
