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Harrath A.H.,King Saud University | Harrath A.H.,Research Unit Animal Reproduction and Developmental Biology | Sluys R.,University of Amsterdam | Ghlala A.,Unite de Recherche de Biologie Animale et Systematique Evolutive | Alwasel S.,King Saud University
Journal of Cave and Karst Studies | Year: 2012

The paper describes the first species of freshwater planarians collected from subterranean localities in northern Africa, represented by three new species of Dendrocoelum Örsted, 1844 from Tunisian springs. Each of the new species possesses a well-developed adenodactyl, resembling similar structures in other species of Dendrocoelum, notably those from southeastern Europe. Comparative studies revealed previously unreported details and variability in the anatomy of these structures, particularly in the composition of the musculature. An account of this variability is provided, and it is argued that the anatomical structure of adenodactyls may provide useful taxonomic information. Source


Hamdi N.,Unite de Recherche de Biologie Animale et Systematique Evolutive | Charfi F.,Unite de Recherche de Biologie Animale et Systematique Evolutive
Alauda | Year: 2012

From September 2001 to August 2004 the reduced freshwater influx into lake Ichkeul has doubled the salinity level, reduced the water level and productivity in the Ichkeul wetland. The number of wintering waterbirds has been reduced by 40% when compared to previous data (reduction of 54.88% in the winter number of birds and 22.37% in migrant numbers). Finally, an action plan to preserve this winter site and its waterbirds is proposed. Source


Zakhama-Sraieb R.,Unite de Recherche de Biologie Animale et Systematique Evolutive | Charfi-Cheikhrouha F.,Unite de Recherche de Biologie Animale et Systematique Evolutive
Journal of the Marine Biological Association of the United Kingdom | Year: 2010

The marine amphipod fauna of Tunisian shallow water was studied during 2003 to 2009. In this paper, we reportfor the first timethe presence of two lessepsian amphipod species Elasmopus pectenicrus and Stenothoe gallensis from the south-east Tunisian coast. © 2010 Marine Biological Association of the United Kingdom. Source


Sghaier Y.R.,Unite de Recherche de Biologie Animale et Systematique Evolutive | Zakhama-Sraieb R.,Unite de Recherche de Biologie Animale et Systematique Evolutive | Charfi-Cheikhrouh F.,Unite de Recherche de Biologie Animale et Systematique Evolutive
Botanica Marina | Year: 2011

Primary production and biomass of Cymodocea nodosa in the Ghar El Melh lagoon (N-E of Tunisia) were measured from November 2006 to October 2007. Leaf growth was determined using the Zieman method and rhizome production was measured by marking and monitoring terminal rhizomes. The following parameters were measured: the number of new leaves per year (16 leaves year -1), the leaf Plastochrone Interval (23 days) and the life span of single leaves (from 2 to 7 months). Seasonality was apparent, with maximum growth in July, maximum leaf production (3.35 g dry weight m -2 d -1) in August, maximum leaf biomass (127.2 g dry weight m -2) and maximum of the shoot density (1437 shoots m -2) in September. Forty-five to 65% of all shoots were reproductive, with flowering density higher than generally observed in C. nodosa elsewhere in the Mediterranean. Environmental parameters (insolation, water temperature and salinity) had a strong seasonal influence on seagrass morphology and production; shoot density, biomass and leaf production were high in summer and low in winter. © 2011 by Walter de Gruyter Berlin Boston. Source

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