Massar et al., J. Mater. Environ. Sci., 2017, 8 (12), pp. 4434-4443 4434 J. Mater. Environ. Sci., 2017, Volume 8, Issue 12, Page 4434-4443 http://www.jmaterenvironsci.com / Journal of Materials and Environmental Sciences ISSN : 2028-2508 CODEN : JMESCN Copyright © 2017, University of Mohammed Premier Oujda Morocco 1. Introduction Coastal zones are spaces of transition between the earth and the sea; the coastal lagoons brackish are part of coastal ecosystems that receive large quantities of organic nutrients and minerals due to the increase of the anthropogenic activity along these coasts and of the use of agricultural fertilizers in their watershed [1]. These ecosystems are host to a remarkable diversity of species. Crustaceans, polychaetes, bivalves and gastropods are the most typical taxa [2]. The macro-invertebrates represent a relevant component of marine ecosystems and constitute a key element in the benthic communities in lagoon and estuarine areas by supporting their biogeochemical cycles [3]. Coastal development inherent in economic progress has resulted in significant disruptions, particularly to biodiversity, due to their tourism and recreational importance [4]. In addition to climate change, anthropogenic activities threaten the maintenance of the environmental functions and services provided by these coastal ecosystems. These natural disturbances and anthropogenic can induce a recolonization continues in the benthic habitats view coastal that benthic organisms living in shallow waters are very sensitive to a number of disturbances, mainly pollution by the household and industrial waste [5]. Due to the habits relatively sedentary and therefore of the inability to prevent unfavorable conditions, benthic organisms are sensitive indicators to changes in environmental factors [6]. However, the profiles of recolonization may be strongly influenced by the Abstract The aim of this study is to assess the dynamics of colonization and patterns on succession of intertidal macrobenthic fauna living in the Sidi-Moussa lagoon (Atlantic Coast - Morocco) using an artificial substrate. To do this, an experimental collector was installed in the median part of the lagoon for eight months. It is comprised of seven shelves. Inside each of it placed; four plates in baked clay numbered (by group of two). Eight plates were collected monthly: four plates having stayed a month in the lagoon and four other cumulative plates who stayed more than a month. These plates are replaced to keep on the field the same number of plate in the crate. The different technical methods, statistics and mathematics used in Ecology (Specific Richness, Shannon index, Evenness) indicate that this colonization may be divided into two periods. A first period of colonization active where the number of colonizing species fluctuate quickly from one month to another and also one levy to the other; a second period, about 4 months after the beginning of the experiment, where the observed variations are lower amplitude. The results reveal a taxonomic diversity of 24 taxa divided into 18 families. For the monthly plates, we counted only the sedentary polychaetes (spirorbis and spirobranchus) with an increasing number in terms of individuals. However, cumulative plaques show a very high rate of fixation of polychaete (spirorbis), which is accompanied by moderately low colonization for gastropods, bivalves, followed by crustaceans and other marine invertebrates (Platyhelminthes, Cnidarians and Echinoderms). Study of the colonization of benthic macro invertebrate of Sidi Moussa lagoon (Atlantic Coast-Morocco): Use of an artificial device R. Massar 1 , A. Essedaoui 1,2 , A. Ferssiwi 1 , A. Aouji 1 , A. Bitar 1 1 Unity of Nutritional Physiopathology and Toxicology - Laboratory BNVRN Faculty of Science of El Jadida, Morocco. 2 Laboratory of life and earth sciences, Regional Center of the Trades of Education and Training Casablanca - Settat, Section of El Jadida, Morocco. Received 25 May 2017, Revised 07 Aug 2017, Accepted 13 Aug 2017 Keywords  Biodiversity  Benthic macro invertebrate  -Experimental Crate  Sidi Moussa lagoon  Colonization Bitar.a@ucd.ac.ma Phone: +212 6 61 13 75 40 Fax: +212 5 23 34 21 87