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Non-indigenous species in the Romanian Black Sea littoral zone: Mya arenaria, Rapana venosa and others Marian-Traian Gomoiu GeoEcoMar, Constantza, Romania.

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Presentation on theme: "Non-indigenous species in the Romanian Black Sea littoral zone: Mya arenaria, Rapana venosa and others Marian-Traian Gomoiu GeoEcoMar, Constantza, Romania."— Presentation transcript:

1 Non-indigenous species in the Romanian Black Sea littoral zone: Mya arenaria, Rapana venosa and others Marian-Traian Gomoiu GeoEcoMar, Constantza, Romania curriculum in natural environmental science, 2005

2 Length classes frequency of Mya arenaria shells from beach deposits curriculum in natural environmental science, 2005

3 Comparative quantitative distribution of Mya arenaria populations at the Romanian Black Sea littoral in 1982 vs. 1974 curriculum in natural environmental science, 2005

4 Quantitative variation of Corbula mediterranea and Mya arenaria populations from the Black Sea sedimentary bottoms between Danube mouth and Constanta curriculum in natural environmental science, 2005

5 Elements for synoptic analysis of Mya arenaria population in 1981 curriculum in natural environmental science, 2005

6 Frequency (%) of main molluscs species at different depths in 1981 at the Romanian littoral of the Black Sea, including nuclei delimitation of communities formation (Ce-Cardium edule lamarcki My - Mya arenaria Cb - Corbula mediterranea Mg - Mytilus galloprovincialis Ss - Spisula subtruncata Pr - Paphia rugata Cp - Plagiocardium papillosum) curriculum in natural environmental science, 2005

7 Average structure of molluscs biomass on the sedimentary bottoms at the Romanian Black Sea littoral in the beginning of 1980s curriculum in natural environmental science, 2005

8 Spatial distribution of Mya arenaria losses by mass mortality at the Romanian Black Sea coast. curriculum in natural environmental science, 2005

9 Comparative situation of molluscs associations ante- (1960-1961) and post- (1986-1990) Mya arenaria introduction into the Black Sea curriculum in natural environmental science, 2005

10 The expansion ways into the Black Sea of some immigrant species: Rapana venosa, Rithropanopaeus harrisii and Menmiopsis leidyi curriculum in natural environmental science, 2005

11 Average size class structure of Rapana venosa populations living on sandy and rocky bottoms curriculum in natural environmental science, 2005

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