Dotychczasowe kierunki badań planktonu na wodach szelfu północno-zachodniej Afryki

Streszczenie w języku angielskim

Bibliographical references (pages 71-72)

Pages 67-72 ; 24 cm

Abstract in English

Strony 67-72 ; 24 cm

The paper presents the evolution of research problems concerned with plankton which has taken place during the period from the first oceanographic expeditions to these waters up to recent years. During the first phase of these studies publications on the subject were mainly concerned with listing findings, and information on the species composition of phyto- and zooplankton, then the next stage dealt with distribution and biology of different species or whole groups of organisms (including different systematic units). In turn attention was concentrated on questions of the biological productivity of these waters, leading up to problems of energy transformation on the first trophic levels. Work on these latter questions has only just been initiated and further analysis is required. Attention is drawn to a certain unevenness in the degree to which research has progressed in different parts of the shelf, as is also the case in relation to different systematic units. The need is emphasised for intensifying work on the identification and biology of the juvenile stages of fish (eggs and larvae) and shrimps, and also the degree to which plankton is used by fish as food. It is also necessary to elaborate collective keys for identifying species of phyto-and zooplankton occurring in the waters of the nort-west African shelf.

Bibliografia na stronach 71-72