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Fig. 33 Quantitative and qualitative changes (mg/m 3 ) of zooplankton in 



the Motovsky Gulf in 1931 (Manteufel). 1 Calanus finmarchicus ; 2 



Balanus larvae ; 3 Decapoda larvae ; 4 Thysanoessa biennis ; 5 Copepoda 



(summer community) ; 6 Limacina retroversa ; 7 Varia. 



plankton (64 and 63 per cent) and that the relative amounts of some other 

 groups present in the open sea and in the gulf were also constant (other 

 Copepoda, Euphausiacea and Coelenterata). 



In large inlets and fjords widely open to the sea, the composition of plankton 

 is intermediate between that of the open sea and of the closed bays and in- 

 lets. Copepoda (and particularly Calanus finmarchicus) constitute, as men- 

 tioned above, the preponderant part of the plankton (Fig. 33). The June maxi- 

 mum of zooplankton is connected actually with the development of C. fin- 

 marchicus. For a biomass of almost up to 300 mg/m 3 (1931) the zooplankton 

 consists of 92 per cent Calanus finmarchicus. 



In small bays and inlets, more or less isolated form the open sea, the neritic 

 character of the plankton is most strongly marked (Fig. 34). The May maxi- 

 mum of the phytoplankton is controlled here also by the mass development 



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Fig. 34. Changes of zooplankton biomass (mg/m 3 ) in one small isolated Guba of the 

 western Murman Peninsula in a layer of 10 to 25 m (Manteufel). The area of the 

 circle corresponds to the biomass represented by the numerals. 1 Nauplii-Cirri- 

 pedia ; 2 Polychaeta larvae ; 3 Decapoda larvae ; 4 Calanus finmarchicus, 5 Fritillaria 

 borealis ; 6 Neritic Copepoda ; 7 Pseudoealanus elongatus ; 8 Cladocera ; 9 Euphau- 

 siacea larvae ; 10 Medusae ; 11 Varia. 



