摘要:

The North Canary Basin (NW Africa) falls within a major eastern boundary upwelling system. This part of the coastal upwelling system is seasonal and is characterised by the development of large filaments migrating seawards. Hence, 16 samples from this location were selected to identify an “upwelling signal” in the composition of the dinoflagellate cyst assemblages.

ISSN:0017-3134    

DOI:10.1080/00173139908559225

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Cultures of a strain ofAmphidinium carteraeHulburt isolated from a eutrophic basin in Alexandria were investigated for the optimum growth conditions, including vitamin requirements, the assimilation index and the potential toxicity of this species. A division rate of 2.7 day–1, was reached on the second and third day under optimum conditions, with and without addition of B12and biotin. The rate of C14assimilation per unit chlorophyll ranged from 0.2 to 5.4 mgC.(mg Chla)-1.h–1according to the growth conditions and to cell size. As the cell density increased in the cultures, the cell size decreased and their photosynthetic efficiency increased. Toxicity ofA. carteraeto brine shrimp resulted from grazing and not from membrane diffusion of extracellular toxins.

ISSN:0017-3134    

DOI:10.1080/00173139908559226

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

We identify a variety of areas and topics that have received relatively little attention hitherto or where there are significant residual problems, following earlier researches. Questions of interest both to palaeontologists and neontologists are emphasized. They are presented in the hope of stimulating new researches on themes presently neglected.

ISSN:0017-3134    

DOI:10.1080/00173139908559227

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor