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The bentic diatoms of the Bandar Tawahi (Gulf of Aden, Republic of Yemen)

100%

Bafana C. A. , Witkowski A.

Oceanological Studies

1995

nr 69/10

77-96

Diatoma from the surface sediments of the coastal area of Bandar Tawahi, a small embayment of the Gulf of Aden (Khormaksar), were studied by means of light (LM) and electron microscopes (SEM and TEM).Species analysis revealed the presence of numerous taxa, some of which are rare and little known such as: Mastoneis biformis, Navicula giffeniana and N. platyventris.In the case of each species, the ecological requirements (salinity preferences, life form) and geographical distribution are given.

Microphytobenthos of the shallow littoral of the Southern Baltic

100%

Plinski M. , Kwiatkowski J.

nr 4

65-79

The microphytobenthos is the ecological fraction of small plant organisms found in sediments. Hitherto only a few investigations into the microphytobenthos in the southern Baltic have been carried out. The objective of the present study was to determine the species com-position and relative abundance of epipsammic taxa in the shallow littoral zone in the southern Baltic as well as the seasonal fluctuations at selected stations in the Gulf of Gda?sk. The results indicate that three regions of the Polish coastline can be distinguished with respect to the spe-cies composition of microphytobenthic diatoms. The distribution of diatom species is probably related to the environmental conditions occurring in particular regions of the Polish coastline. The percentage of certain diatom species tends to follow a clear seasonal pattern.

International and European standards for algal-based monitoring

100%

Kelly M.

nr 1

77-81

International and European standards relevant to algal-based monitoring have been developed by the International Standards Organisation (ISO) and the Comite Europeen de Normalisation (CEN). This work has been given new impetus by the publication of the EU Water Framework Directive (2000/60/EC), which requires the use of CEN and ISO standards where available. Standards addressing diatom sampling and analysis, macrophyte survey, algal survey and phytoplankton analysis are all either published or under development by CEN. There is also a standard under development dealing with quality assurance of ecological assessments in the aquatic environment. Together, these standards should ensure that robust data are collected that can be used for intercalibrations between Member States.