Reza Rahnama

Iranian National Institute for Oceanography | INIO

The occurrence of microplastics (MPs) in beach sediments of the southern Caspian Sea was well documented, however, there are still many unknowns about the abundances and distributions of MPs in the rivers ending to the Caspian Sea. Here, bank sediments of 26 sites in the thirteen rivers were surveyed in two seasons. However, there was not any signi...

Today, pollution of aquatic ecosystem is one of the main problems of human life. Aquatic organism, are the main part of food basket especially in populations that living near the sea. Pollution has three main resources: industrial waste water, agricultural waste water, and sewage. Metals are the main part of them. This material can accumulate in so...

The nutritional values of the three Caspian Sea macroalgae species, Cladophora glomerata, Enteromorpha intestinalis and Laurencia caspica were evaluated based on proximate and fatty acid composition. The investigated species demonstrated low lipid composition (0.20±0.03-1.62±0.26 % DW) and high carbohydrate (21.70±0.17-26.1±1.27%DW) and protein con...

The situation of Ramsar sites along the Caspian Sea coast has deteriorated over the past decades, and this is more noticeable in the narrow coastal strip of the south Caspian Sea. In this study we investigate how the Caspian Sea level changes affect the coastal Ramsar sites. Particularly, we focus on the Gorgan Bay in the southeast corner of the Ca...

Aim. Analysis of new data on populations of invasive ctenopfores Вeroe ovata and Mnemiopsis leidyi in the Caspian Sea and assessment of adaptation of B. ovata to new habitat conditions.Material and methods. The data was obtained in the Dagestan sector of the Middle Caspian Sea in September‐November 2021. Ctenophores and zooplankton were collected b...

This investigation aimed to determine the contents of biogenic SiO2 and different phosphorus forms (P) and to evaluate phosphorus ecological risk in surface sediment of Anzali wetland. According to the results, biogenic SiO2 ranged from 0.29 to 3.04%. Also, the average biogenic SiO2 at all studied stations was 1.36 ± 0.83%. Results indicated that t...

This investigation aimed to determine the contents of biogenic SiO2 and different phosphorus forms (P) and to evaluate phosphorus ecological risk in surface sediment of Anzali wetland. According to the results, biogenic SiO2 ranged from 0.29 to 3.04%. Also, the average biogenic SiO2 at all studied stations was 1.36 ± 0.83%. Results indicated that t...

The occurrence of microplastics (MPs) in nearshore zones of the southern Caspian coasts is well documented; however, no data are available on MP occurrence in offshore sediments. In this study, six sandy beach stations and 18 inshore-offshore stations (six transects) were surveyed. MPs were detected in all sediment samples. The mean abundances of M...

In this study, as the first comprehensive monitoring, the occurrence of microplastics (MPs) in inshore and offshore surface waters of the southern Caspian Sea was investigated. Our data indicated that MPs, which were detected in all the samples, were widely distributed in the thirteen studied stations. Non-normally distribution of the MPs was obser...

Microplastic (MPs) pollution in the aquatic and terrestrial environments has caught many attentions in the scientific literatures. Currently, no information is available about MPs pollution in Caspian Sea, the largest lake in the world. This study indicates the first report on the MPs pollution in the sediments of the southern Caspian coastal zones...

In the research, changes of physico-chemical and biological properties of coastal waters of Sisangan- Chalus area were evaluated. Field measurements and sampling were carried out by water sampling, and using CTD and Hach probe in depths of 5, 10 and 20 m in the southern coastal waters of the Caspian Sea during autumn 2013 to winter 2014. In autumn,...

Laurencia caspica (red macroalga) Enteromorpha intestinalis and Cladophora glomerata (green macroalgae) are three major macroalgae that grow along the southern coasts of the Caspian Sea. We investigated spatial and temporal variation of these three macroalgal species on hard substrates and their relation with environmental factors in 2014. Sampling...

In this study the effect of lead on condition indices of zebra mussel (Dreissena polymorpha) together with the accumulation of lead in the soft tissue of mussels, were investigated. Studies showed no significant differences in condition indices (TCI and SCI) among the mussels in control and lead treatments. Mussels condition indices decreased durin...

In this study, the effects of lead on filtration rate of zebra mussel (Dreissena polymorpha) together with the accumulation of lead in the soft tissue of the mussels, were investigated. Studies showed different effects of lead in all concentrations. In three concentrations of lead (2, 48, and 93 µg L−1), no significant differences were investigated...