Cochlodinium polykrikoides cyst with potential to form HABs isolated from sediment of Konarak Coast (Southeast Coast of Iran)

سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 409

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شناسه ملی سند علمی:

BIOCONF20_772

تاریخ نمایه سازی: 28 اردیبهشت 1398

چکیده مقاله:

Cochlodinium polykrikoides is a dinoflagellate with worldwide distribution, Harmful Algal Blooms (HABs) of the phytoplankton species happen in many countries and causes mortality in fish and affects the aquaculture industry and also influences human health. In Iran, the first bloom of the Cochlodinium polykrikoides species was reported in 2008 from the southern water of Iran, causing more than 32 tons of aquatic mortality. In recent years, harmful algae bloom (HABs) has increased in most coastal areas. Approximately 70% of planktonic bloom former species belonging to the dinoflagellates. Dinoflagellates have the ability to produce two types of resting and temporary cysts during their life cycle. Temporary cysts are produced in response to exposure to inappropriate conditions such as temperature, pH, and nutrient salinity stress. The resting cyst provides through vegetative cells as a part of the sexual life cycle. Resting cyst can be formed on the basis of metabolic activities, morphology characteristics, type of microalgae, and the production of the cyst during the sexual or vegetative stage, in different forms with different degrees of stability versus environmental conditions. The resting stage in sediment is a connection between the benthic and plankton and is a key point in the ecology of an ecosystem. Cysts are in sediments as a seed bank and, when conditions are suitable, they become a motile population in the water column. In this study, sediment sample from Chabahar Bay (winter and spring 2017) were collected using Van Veen Grab from the Konarak area.The isolation of Cochlodinium polykrikoides cyst was carried out in laboratory conditions and the single cyst of the species was cultured in f2 medium with a 12L: 12D cycles in the phycolab. Petri Dish containing cyst was examined regularly. After six months, the number of cysts in the culture medium increased, but so far no excystment in the cysts has been observed, however, the number of cysts increased to over 50 cysts in the plate. This is confusing because cysts are a result of sexual reproduction, and their increase should be due to an increase in the number of cells. It seems that this is a Special species-specific characteristic that needs further investigation and is under review.

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نویسندگان

Gilan Attaran-Fariman

Department of marine biology, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar

Elham Parvaz

Department Marine Biology, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar,