. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 294 BIOLOGY OF THE SEAS OF THE While plankton in the straits leading to the Baltic Sea does not differ much from that of the North Sea, in the upper parts of the Gulfs of Bothnia and Finland the plankton has a purely fresh-water character. Instead of the numerous marine species Chaetoceros, Rhizosolenia, Ceratium tripos and ? fusus, a considerable number of hydro-medusae, Copepoda (Oithona nana, Eurytemora hirundo, Paracalanus parvus, Acartia longiremis), the marine species of Rotifera (sp
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 294 BIOLOGY OF THE SEAS OF THE While plankton in the straits leading to the Baltic Sea does not differ much from that of the North Sea, in the upper parts of the Gulfs of Bothnia and Finland the plankton has a purely fresh-water character. Instead of the numerous marine species Chaetoceros, Rhizosolenia, Ceratium tripos and ? fusus, a considerable number of hydro-medusae, Copepoda (Oithona nana, Eurytemora hirundo, Paracalanus parvus, Acartia longiremis), the marine species of Rotifera (species of the genus Synchaeta mastigocera), numerous. Fig. 138. Penetration of certain Copepoda into the depths of the North Sea and into the Baltic Sea (Pesta). 1 Eurytemora hirundoides typicus; 2 E. hirundo; 3 Oithona; 4 Southern boundary of Oithona similis (northeastern in the Baltic Sea); 5 Northern boundary of Oithona rnana; 6 Eastern boundary of Centropages; 7 Metridia longa; 8 Northern boundary of Paracalanus parvus; 9 Northern boundary of Pseudocalanus elongatus; 10 Northern boundary of Acartia bifilosa; J J Southern boundary of Limnocalanus grimaldi. Tintinnoidea (Parafavella, Tintinnopsis), a series of the species Sagita, the pteropod mollusc Limacina retroversa and others, we have east of the Darss ridge throughout the Baltic the blue-green algae Aphanizomenon flos-aquae, Nodularia spumigena and Anabaena baltica; the diatoms Chaetoceros wig- hami, Thalassiosira baltica and Ch. danicum, which sometimes bring about a summer and autumn flowering of the peridineans P. depressum and P. pellu- cidum, Prorocentrum micans, Dinophysis baltica, Goniaulax catenata and others, some Infusoria, for instance Tintinnopsis campanula, Helicostomella subulata, among the Rotifera a preponderance of Brachionidae, and the species Collotheca pelagica. Most of the Rotifera belong to euryhaline fresh- water forms (Brachionus angularis, B. pala, B. bakeri, Anuraea aculeata,. Please note that t
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