Ecological and Taxonomical Study of Dinoflagellates Species causing Redtide in the Shatt Al-Arab Estuary ۲۰۲۲

During recent few years eutrophication and harmful algal blooms are common in the Shatt Al-Arab estuary. In the August ۲۰۲۲ the red tide phenomena was take place along south part of Shatt Al-Arab estuary. Six sites were selected to sampling of water and dinoflagellates. Some ecological factors were studied including water temperature ranged (۲۹.۵-۳۴.۵ C_x۰۰۱۸_۶), salinity (۷.۵-۱۲.۰ psu). Salinity was recorded increasing (۷.۵-۱۲.۰ psu), also total dissolved solids were very high in study area (۱۴۱۰-۸۹۲۴ mg/l). Hydrogen ion concentration recorded (۷.۳۳-۷.۹). Dissolved oxygen were ranging from (۲.۱-۷.۱ mg/l). Nutrients concentration (nitrate and phosphate) were (۷.۵۰-۱۹.۹۹ _x۰۰۰۳_bcg/l and ۰.۰۲-۰.۲۲ _x۰۰۰۳_bcg/l) respectively. Chlorophyll a concentration ranging from (۴.۶۲-۱۰۶.۹۹) _x۰۰۰۳_bcg/l. The quantitative study of the species P. minima showed that the highest values were (۵۱۲۵۰۰۰۰) cell/liter recorded at the Mashab station, while the lowest values (۱۴۵۰۰۰۰) were recorded at the Sendibad station.

کلیدواژه ها:

Ecological and Taxonomical ، Dinoflagellates ، Red tide