مقالههای M.M. Dorgham
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
نویسنده(ها): M.M. Dorgham
اطلاعات انتشار: International Journal Of Environmental Research، هفتم،شماره۳، Summer ۲۰۱۳، سال ۰
تعداد صفحات: ۱۲
Plankton studies are one of the major items of the marine scientific activities in the ROPME SeaArea، whereas numerous investigations have been conducted on the plankton during the past century. Forphytoplankton، species composition، abundance and biomass، primary production، harmful algal blooms، redtide، toxic species، and eutrophication were considered. Zooplankton studies included species compositionand abundance، certain zooplankton groups and few studies on certain species. The main achievement of these studies was the identification of large number of phytoplankton and zooplankton species in different parts of the RSA and estimation of their abundance.The survey of these studies revealed the occurrence of several gaps in the plankton research in ROPME Sea Area. For example، the majority of these studies were carried out in the inner part، while some of them were done in the middle part. Several studies were based on samples collected once only during certain time of the year or on samples collected from localized areas. The role of the function groups of the both phytoplankton and zooplankton، the harmful algal blooms، toxic phytoplankton species، the role of small phytoplankton groups rather diatoms and dinoflagellates and vertical migration of zooplankton were little concerned. In addition، the continuous record of the Indo–Pacific species entering the inner RSA from the Sea of Oman appeared to be completely missed.The present study attempts to stress the achievements as well as the gaps in the earlier plankton studies in the ROPME Sea Area in order to propose a scientific plan for comprehensive study of plankton community relative to the prevailing environmental conditions in the concerned area.
اطلاعات انتشار: International Journal Of Environmental Research، نهم،شماره۱، Winter ۲۰۱۵، سال ۰
تعداد صفحات: ۱۰
The alien polychaetes are widely distributed in the whole Mediterranean Sea as well as in the Egyptian waters. The objective of this study is to highlight the distribution and abundance of the alien polychaetes along the Alexandria coast, their contribution to the total polychaete community and the changes they caused in the community structure. Through monthly sampling polychaetes were collected at four sites of different ecological characteristics During June 2005 – May 2006 from hard substrates at 0.5–1m depth andfrom soft bottom of the intertidal zone. Ten alien species were recorded from the study area, five of them (Linopherus canariensis Langerhans, 1881, Loimia medusa Savigny in Lamarck 1818, Syllis schulzi Hartmann– Schröder 1960, Phyllodoce longifrons Ben–Eliahu 1972 and Leodice antennata Savigny in Lamarck, 1818)were found for the first time in the Egyptian waters. Six species were widely distributed in the study area demonstratingconsiderable different count on both the spatial and temporal scales, with total count fluctuating between 10 – 18810 ind\m2 (individual\m2), constituting 14.3% – 45.5% of the total polychaetes and peaks occurring in different times at the sampling sites. Syllis schulzi and Pseudoneries anomala were the major components, accounting for 53.4 and 41.5% of the alien polychaetes, and of pronouncedly less contribution was Linopheruscanariensis (3.8%), in addition to occasional active contribution of Hydroides elegans and Loimia medusa, which displayed at times up to 22% and 19% respectively at some sampling sites.
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