Phytoplankton composition related to the environmental conditions in the coastal waters of the Gulf of Erdek

1545-1559Seasonal changes of phytoplankton communities in the coastal waters of the Gulf of Erdek from November 2006 to August 2008 were examined in relation to some environmental variables and 95 species from 6 different algae groups were identified. In addition, two species were recorded for the first time in the Turkish coastal waters and one species for the Sea of Marmara. The maximum total phytoplankton abundance (1.99 × 105 cells L-1) were observed in May 2008, with Pseudo-nitzschia sp. being the most dominant species of that month (1.52 × 105 cells L-1). Both the Bray-Curtis diversity index and the Euclidean distance indicated that the upper and lower water layers were separated from each other at the stations, and the Spearman’s rank-correlation and CCA analyses also showed that environmental variables affected the abundance of species. Furthermore, according to the CCA diagram, especially the temperature and dissolved oxygen had a bigger impact on the distribution of species. The Shannon-Wiener diversity index (Hʹ) values were low when Pseudo-nitzschia sp., Prorocentrum micans, Gymnodinium sp. and Prorocentrum scutellum were dominant over other species in the sampling period

First record of Ferosagitta galerita (Dallot, 1971) [Chaetognatha] in the Mediterranean Sea

The first record of Ferosagitta galerita in the Mediterranean Chaetognatha fauna is reported. The morphological and ecological features of this species, which was hitherto only known to live near Madagascar in the Indian Ocean, are given in detail. With this new finding, the number of chaetognath species to be known in the Mediterranean Sea is increased. © The Author 2007. Published by Oxford University Press. All rights reserved

Phytoplankton composition related to the environmental conditions in the coastal waters of the Gulf of Erdek

Seasonal changes of phytoplankton communities in the coastal waters of the Gulf of Erdek from November 2006 to August 2008 were examined in relation to some environmental variables and 95 species from 6 different algae groups were identified. In addition, two species were recorded for the first time in the Turkish coastal waters and one species for the Sea of Marmara. The maximum total phytoplankton abundance (1.99 x 10(5) cells L-1) were observed in May 2008, with Pseudonitzschia sp. being the most dominant species of that month (1.52 x 10(5) cells L-1). Both the Bray-Curtis diversity index and the Euclidean distance indicated that the upper and lower water layers were separated from each other at the stations, and the Spearman's rank-correlation and CCA analyses also showed that environmental variables affected the abundance of species. Furthermore, according to the CCA diagram, especially the temperature and dissolved oxygen had a bigger impact on the distribution of species. The Shannon-Wiener diversity index (H') values were low when Pseudo-nitzschia sp., Prorocentrum micans, Gymnodinium sp. and Prorocentrum scutellum were dominant over other species in the sampling period

Adaptability and vulnerability of zooplankton species in the adjacent regions of the Black and Marmara Seas.

During 2005–2008 species composition, abundance patterns, natural mortality rates and salinity effects on zooplankton were studied in the Bosphorus regions of the Black and Marmara Seas. The tendencies to diminish for abundance and biomass of the Black Sea originated zooplankton species and to increase for the proportion of their carcasses in the direction from the Black Sea toward the Marmara Sea were found. The mortality in the Black Sea species increased with depth in the Marmara Sea. The contribution of organic matter of carcasses of the Black Sea originated organisms to bacterial processes in the deep strata of the Marmara Sea was estimated. Different salinity and temperature regimes restrict mutual penetration of the species in these seas