TY - JOUR AU - ISMAEL, A. AU - HALIM, Y. PY - 2012/09/07 Y2 - 2024/03/28 TI - Potentially harmful Ostreopsis spp. in the coastal waters of Alexandria - Egypt JF - Mediterranean Marine Science JA - Mediterr. Mar. Sci. VL - 13 IS - 2 SE - Research Article DO - 10.12681/mms.300 UR - https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/12272 SP - 208-21 AB - <em>Ostreopsis </em>spp. has been reported for the first time from the Egyptian Mediterranean waters. Macroalgal samples were collected monthly between June 2005 and December 2007, from the rocks at Abu Qir, from less than 1.5 m depth, and their associated microalgae examined. Populations of two <em>Ostreopsis </em>morphotypes were found to occur in this location, east of Alexandria, viz., <em>O</em>. cf <em>ovata </em>Fukuyo and <em>Ostreopsis</em> morph1. The <em>Ostreopsis </em>spp. was abundant and dominant during the summer. They were more abundant as epiphytes of the brown algae <em>Padina </em>sp. and <em>Sargassum </em>sp., less abundant on the red algae <em>Corallina </em>sp., <em>Jania </em>sp., <em>Laurencia </em>sp. and even less so on the green algae <em>Ulva </em>spp. <em>Ostreopsis </em>cf. <em>ovata </em>was also identified during the summer months on the same macroalgal species, although in a much lower abundance. <em>Ostreopsis </em>spp. alternated in dominance with the benthic cyanobacteria <em>Oscillatoria </em>spp. and the diatom <em>Licmophora </em>sp. Other benthic dinoflagellates recorded at low abundance included <em>Amphidinium carterae</em>, <em>Gymnodinium </em>sp. and <em>Prorocentrum lima</em>. ER -