Wassim Mahmoud Mayya^*(1), and Kamal Salem Al-Hanoun⁽²⁾

(1) Tishreen University, Lattakia, Syria

(2). Tishreen University, Lattakia, Syria.

(*Corresponding author: Wassim Mayya . E-Mail: wassimrand88@gmail.com).

Received: 11/06/2021                      Accepted: 24/10/2021

Abstract: 

 The current research included studying the feeding of a species of crustacean zooplankton of the order Cyclopoida Oithona nana (Giesbrecht, 1892), in addition to investigating the microstructure of the mandible and determining the preferred food for the species, then examining 112 samples, collected vertically continuously and gradually over the period between In March 2020 and February 2021, sample collection was accompanied by taking hydrophysical and hydrochemical measurements from three different areas from each other with their environmental characteristics. Knowing the gut content of the aforementioned species gave new data on the conditions and behavior of its feeding under the influence of various environmental factors. The number of phytoplankton and zooplankton species that appeared in O.nana reached (16) species and (4) genera, of which (5) belong to the flagellate phytoplankton, two genus of diatoms, and five stages of the napelius larvae of the type Acartia clausi, in addition to (6) species of The Ciliates and two genus from the rotors, as for the average number of individuals, it was recorded (3268) individuals, whereas the mean Ciliates were recorded for the number of individuals (1875) individuals in all seasons of the year.

Keywords: Oithona nana, The Feeding , Mandible, Gut Content, Environmental factors.

Full paper in Arabic: pdf