دراسة وتحديد الأنواع السامة من العوالق النباتية ربيعاً في المياه الساحلية لمدينة اللاذقية

Abstract

This research was conducted on coastal water in south of Latakia city, specifically in (Al-Korniche Al-Janoubi) area, as a continuation of previous studies along the Syrian coast. Three stations were selected from two locations influenced by sewage discharge. One cruise was carried out in spring (May 2023). water samples were collected to study the changes in phytoplankton in the studied stations, along with the identification of some physical and chemical factors of water (temperature, salinity). The lowest temperature was recorded at the sewage discharge point, measuring 22.3°C, and the highest temperature, 26.3°C,

   The louest value of salinity 35.2‰ was recorded at sewage whereas The highest value 39.1‰ was recorded at oceasional sea area toxic species showed at all stations and the values of abundance have varied between stations, The highest abundance was recorded at ST1-50 with the total counts of 130.200 Individual/l and lowest averaye at stations awaw from sewage with total counts 8,576 Individual/l.

was recorded in the area farther from the discharge point. This study recorded 54 species of phytoplankton, followed as: 29 species of diatoms, 19 of dinoflagellata, 3 species of cyanobacteria and 3 species of chlorophyta.

Diatoms dominated during the spring bloom. Moreover, some toxic species that were prevalent which produce chemicals, with toxic effects on the nervous system of marine organisms, especially fish, was also observed to reach humans.  including Pseudo-nitzschia delicatissima, Leptocylindrus minimus, and Leptocylindrus danicus.