علوم زیستی دریا
Noormohammad Safaei; Mehran Loghmani; Parvin Sadeghi
Abstract
The Makoran Sea is been influencing by the summer and winter monsoon currents, and this phenomenon is a natural stressor for species inhabiting the aquatic ecosystem, including bivalve molluscs. In the current study, the effect of winter monsoon on the sub-tidal bivalve densities of the northern coast ...
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The Makoran Sea is been influencing by the summer and winter monsoon currents, and this phenomenon is a natural stressor for species inhabiting the aquatic ecosystem, including bivalve molluscs. In the current study, the effect of winter monsoon on the sub-tidal bivalve densities of the northern coast of Makoran were evaluated. Sampling of sediments were conducted from three regions of Ramin (3 stations), Beris (3 stations) and Pasabandar. Physical chemical parameters of transparency, salinity, acidity, temperature, organic matter, and grain size of each station were also obtained to investigate their relationship with density, which among the factors, only temperature, were significantly lower in the monsoon and pre-monsoon periods. In this study, 10 species of bivalves were identified, according to which Donax scalpellum with 13.37% had the highest and Trisidos tortuosa with 3.98% had the least frequency. The population of bivalves was calculated after Monsoon, with a frequency of 46.17% (mean 713 ±23.14 m2), pre-Manson, with 27% (mean of 413 ± 25.12 m2) and Monsoon, with 26% abundance. (413±13.34 m2). The pasabandar was (including stations 7, 8, 9 and 10), with an average density of 63±28.2 persons / m2 having the highest density in comparison to Beris (43±17.7) and Ramin (44±19.37). There was a significant difference between the stations. There was no significant positive correlation between silt and sand and temperature with density but no significant relationship between other environmental factors and organic matter with density. In general, it can be said that various factors are considered as parameters controlling the abundance and expansion of bivalve communities of different study areas and stations in the northern coastal waters of Makoran, including It is possible to name the factors of temperature, particle size and type of substrate, organic matter and nutrients, monsoon flows that have the most influence on the density of bivalve organisms.