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Lessepsian invasion

In recent years we have been witnessing a large-scale invasion of many alien tropical species into the Eastern Mediterranean through the Suez Canal, termed Lessepsian invasion. This process is promoted both by the ongoing warming of sea surface temperature (SST) in the last decades, and the establishment of hyper-oligotrophic conditions in the Eastern Mediterranean as a result of closure of the Nile River by the High Aswan Dam. The unique position of Israel at the vicinity of the two recently connected oceanic provinces, The Red Sea and the Eastern Mediterranean provides an unmatched opportunity to investigate the scale and magnitude of the Lessepsian invasion and to understand its effect on the marine coastal ecosystems. This study focuses on several species of larger benthic foraminifera (LBF) that are indicative to tropical and subtropical regions and serve as an excellent biomonitoring tool for the marine ecosystems of these environments

Bayesian phylogenetic tree (GTR+I+Γ) showing the phylogenetic position of 72 partial SSU 18S rDNA of soritids. The 52 sequences obtained for this study are marked by their DNA isolate numbers. Numbers at nodes indicate (from left to right) posterior probabilities (BI) and bootstrap values (ML). The tree is rooted on Parasorites sp.

Specimens of Sorites variabilis and Amphisorus hemprichii showing a faint rim around the apertures. 1-2. S. variabilis. 1. Lateral view of live specimen (scale 100 μm); 2. Apertural face with faint rim around the apertures (scale 50μm); 3. Apertural face of A. hemprichii with faint rim around the apertures (scale 50μm).

Department of geological and Environmental Sciences

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