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Spatial distribution and structure of benthic polychaete communities of essaouira intertidal rocky shores(Atlantic coast of Morocco)

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Journal of Oceanology and Limnology 2020年第1期38卷 143-155页

作者： CHOUIKH Nor-eddine GILLET Patrick LANGSTON WJ CHEGGOUR Mohamed MAAROUF Abdelmalek MOUABAD Abdelfattah Laboratory“Aliments Environnement et santé”Faculty of Sciences and TechnicsB.P.549Cadi Ayyad UniversityMarrakech 40000Morocco Mer Molécules Santé Department of Biology EnvironmentFaculty of Sciences UCOAngers 49008France Marine Biological Association the LaboratoryCitadel HillPlymouth PL12PBUnited Kingdom Department of Biology Ecole Normale SupérieureB.P.2400Cadi Ayyad UniversityMarrakech 40000Morocco

Polychaetes are one of the most important groups ofmacrobenthic organisms in coastal and marine environments,in terms of diversity and abundance,and play an important role in the functioning of *** study aims to describe the structure and spatial distribution ofpolychaete communities along essaouira's rocky shoreline(Atlantic coast of Morocco)in relation to the major environmental variables such as granulometry,salinity,temperature,pH,and intertidal *** sites from these intertidal rocky shores were sampled using a quadrat method during the summer 2016.A total of 4435 individuals belonging to 34 taxa were *** the families,Sabellaridae(24%)and Nereididae(23%)were ranked first in terms of abundance of *** alveolata(24%)and Perinereis cultrifera(13%)were the dominant ***(H')values varied from 2.28 to ***'s index(J')varied between 0.62 and *** was essentially due to the low dominance of few *** analysis was used to characterise essaouira's rocky shores on the basis of benthic polychaete *** analysis confirmed the presence of three distinct *** to canonical correspondence analysis,the structure and distribution of faunal assemblages of benthic polychaetes was mainly related to topographical complexity,water temperature,hydrodynamic conditions and *** conclude that these rocky shores show typically high benthic polychaete diversity compared to the taxonomic list of other rocky *** addition,these results constitute a baseline data for the development of a sustainable network for long-term monitoring of benthic polychaete community changes due to ecological factor influences and anthropogenic activity impacts.

关键词： polychaetes taxonomic diversity essaouira rocky shore faunal assemblage

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Groundwater Chemical Evolution in the essaouira Aquifer Basin—NW Morocco

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Open Journal of Modern Hydrology 2013年第3期3卷 130-137页

作者： Mohammed Bahir Rachid El Moukhayar Najiba Chkir Hamid Chamchati Paula Galego Fernandes Paula Carreira Geodynamics Laboratory Magmatic Géoressources and Georisks Université Cadi Ayyad Marrakech Morocco Geography Departement Faculty of Letters and Humanities Sfax University Sfax Tunisia Nuclear Technology Institute Sacavém Portugal.

The sustainability of groundwater resources for drinking water supplies, agriculture, and industry a prime concern in countries dominated by arid and semi-arid climates such as Morocco. The growing demand for groundwater coupled with impacts from land use and climate change make sustainability an even more important water management goal. In order to make sound decisions about water use and protection of water quality, managers and policy makers must have a sound understanding of such factors as the location and amount of groundwater recharge and groundwater ages. Due to the population growth and climate change (causing long periods of drought) in the world, many countries have intensively increased their use of water sources for supplying potable water to population and for their agricultural (irrigation) and industrial developments. Due to the lack of surface waters, people exploit mainly underground water reservoirs. So, it is necessary to study and characterize these water reservoirs to avoid any excess of exploitation. The water resources of the essaouira basin are characteristic of a semi-arid climate, and are severely impacted by the climate (quantity and quality). Considering the importance of the essaouira aquifer in the groundwater supply of the region, a study was conducted in order to comprehend this aquifer groundwater evolution. It is an aquifer located on the Atlantic coastline, southern (Morocco), corresponding to a sedimentary basin with an area of near200 km2. Covering the Palaeozoic bedrock, the sedimentary series range from the Triassic to the Quaternary. The geological structures delineate a syncline bordered by the Tidzi diapir of Triassic age which outcrops to the East and South. In the essaouira basin a multi-aquifer was identified constituted by detrital deposits of the Plioquaternary and dolomitic limestones of the Turonian. The Plioquaternary is unconfined below the Senonian marls. However, in some places it can be in direct contact with t

关键词： essaouira Basin Aquifer Hydrogeochemistry Mass Balance Model

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