Vol. 54, 2015
diversity of amphipods (Crustacea: Peracarida) on shallow algae and
seagrass in lagoonal ecosystem of the Mediterranean Tunisian coast
Zaabar, Rym Zakhama-Sraieb*, Faouzia Charfi-Cheikhrouha and Mohamed
Bio-Ecologie et Systématique Evolutive, Département de Biologie
Animale, Faculté des Sciences de Tunis, Université Tunis El Manar, 2092
Manar II, Tunis, Tunisia
lagoon is a semi-enclosed marine ecosystem, where various types of
human activities have been developed. To investigate the distribution
and temporal variation of amphipod assemblage, monthly sampling was
conducted at the Menzel Jemil site from October 2009 to September 2010.
total number of 3,620 specimens were collected from floating algae and
seagrass allowing the identification of 10 amphipod species. Moreover,
several indices, species richness, dominance, mean density, and
diversity index were estimated to characterize the amphipode
assemblage. Gammarus aequicauda
was the most dominant species in all seasons. In addition, the minimum
and maximum values of species richness of amphipod were observed in
January (3 species) and April (8 species), respectively. The mean
density and species richness were negatively correlated with plant
biomass. Mean Shannon index (H′) and evenness (J′)
were 1.62 ± 0.34 and 0.67 ± 0.16, respectively. Non-metric
multidimensional scaling (MDS) analysis based on the mean species
density showed three seasonal groups of samples. Therefore, canonical
correspondence analysis (CCA) made it possible to summarize the overall
situation for the species, monthly sampling, and environmental
parameters on a single graph.
Conclusions: Thus, the temperature, turbidity, and chlorophyll a content are the most often reported factors for the distribution and structure of amphipods in the Bizerte lagoon.
Key words: Coastal lagoon; Temporal distribution; Amphipod assemblage; Tunisia.
*Correspondence: E-mail: firstname.lastname@example.org