علوم زیستی دریا
Majid Shekari; Mohammad Ali Salari-Aliabadi; Ahmad Savari; Simin Dehghan Madise
Abstract
This study was conducted to identify and study the communities structure of adhesive organisms or the fouling of 13 years old artificial reefs on the coast of Bahrakan along the west of the Persian Gulf. fouling sample was collected seasonally from spring 2016 to winter 2016 from 4 sampling sites using ...
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This study was conducted to identify and study the communities structure of adhesive organisms or the fouling of 13 years old artificial reefs on the coast of Bahrakan along the west of the Persian Gulf. fouling sample was collected seasonally from spring 2016 to winter 2016 from 4 sampling sites using quadrates 25 × 25 cm by diving operation. Based on the biomass (wet weight), Anthozoa corals with 88% of the total biomass, contain the most adhesive mass, followed by sponges (10%) and hydrozoa corals and Arthropod with 1% of the total biomass. The spring season showed the highest average rate, which was due to the biomass of the Antozoa group with 89% in this season. Based on the cluster test, the two winter and autumn seasons have a similar percentage of 80% and the summer and spring seasons show a similar percentage of 50%. Also, based on cluster analysis of two structures A, D, the similarity level of 45% and B, C indicate the similarity level of 80%
علوم زیستی دریا
atefe soleimani; Mahsa Haghi; mohammad zakeri; majid shekari
Abstract
Feeding strategy of blue swimming crab (Portunus pelagicus) was investigated monthly in Khuzestan province water from April-2016 to march-2017. Samples were catch by trawl net. The content of P. pelagicus stomachs, percentage of occurrence frequency and Frequency percentage of feeding items was checked. ...
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Feeding strategy of blue swimming crab (Portunus pelagicus) was investigated monthly in Khuzestan province water from April-2016 to march-2017. Samples were catch by trawl net. The content of P. pelagicus stomachs, percentage of occurrence frequency and Frequency percentage of feeding items was checked. In crab stomachs different feeding items group such as crustacean, mollusks, sponges, phytoplanktons, corals, fish, sand particles and etc. Was observed. The highest frequency of occurrence belonging to sponges, crustaceans and mollusks, respectively. Furthermore, Frequency percentage of sponges (38.65%) was higher than other preys. Costello's graphical model analysis Results analysis of P. pelagicus stomach content by Costello's model showed that this crab is a predator with specific feeding nich and feeding specific prey include sponges, crustacean and mollusks during a year. Though, it's feeding pattern show few seasonally fluctuations. In this model, phytoplanktons, fish, polycheats, corals, nematode, protista, ctenophore, nematodes, cestod, sea insects and sand identified as accidental or rare prey. Probably, ingest by crab while feeding from specific prey.