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| Pedrotti, Ml; Fenaux, L. |
| A survey of-selected echinoderm larvae and postlarvae was conducted during Almofront-1 cruise in the eastern Alboran Sea (Mediterranean Sea). In the study zone, surface waters from the Atlantic current enter via Gibraltar forming a hydrologically complex area with associated eddies and gyres. The distribution pattern of echinoderm larvae is described and related to specific biological and physical frontal processes responsible for larval retention or dispersal. In the part of Alboran Sea, influenced by Mediterranean waters, echinoderm larvae and postlarvae were quite scarce in comparison to the stations localised in the Atlantic jet and sites under influence of Atlantic waters where species richness and larval abundance were higher. The Anticyclonic gyre... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00094/20494/18163.pdf |
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| Pedrotti, Ml; Marchi, B; Lemee, R. |
| The biological activity of a methanolic extract of the introduced species Caulerpa taxifolia and caulerpenyne (main secondary metabolite of the alga) was tested on embryogenesis, pluteus and metamorphosis stages of the sea urchin Paracentrotus lividus. The bioassays revealed different levels of toxicity according to the egg and larval development stages. Larval development was the most sensitive phase, followed by gastrulation. Methanolic extracts at a concentration of 1.0 mu g ml(-1) and caulerpenyne at a concentration of 100 ng ml(-1) (300 nM) tested on young larvae (4-arm stage) cause death within four hours. The same concentrations of methanolic extract, tested on eggs, blocked cleavage up to early blastula stage, whereas a double concentration of... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00094/20484/18154.pdf |
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