TABLK 5 



TABLE 6 



Abundance of organisms (specimens/ni') in 



the neuston and subneuston layers in 



Polygon South and Station 1 13 (south 



region) in the Bering Sea, 



August 26-29, 1988. 



Station 

 Number 



108 



109 



110 



111 



112 

 Average for polygon 



113 

 Average for region 



hydrozoan Agkmtha digitale, pteropods Limacina and Clioue, 

 larvae of bivalves, cirripeds, and ophiuinans. all adult stages of 

 Acartia tumida, nauplii. first three copepodite stages of 

 Pseiidocahinus ininutus, nauplii. IV-V copepodite stages and 

 adult Calanus glacialis, IV-V copepodite stages of 

 Epilahidocera amphitrites, nauplii oi Acartia longiremis and 

 Eucalanus biingii, hyperiids Paratheinisto japonica, zoea of 

 decapods and tunicate Oikopleura all predominate in the neuston 

 layer of the Gulf of Anadyr. Absolutely predominating in the 

 neuston layer were tintinnids. the pelagic polychaete Tomopiehs, 

 larvae of Bryozoa, nauplii of Calanus plumchrus and 

 Epilahidocera amphitrites, and larvae ( megalopa) of decapods. 



In comparison to the subneuston layer. 36*^ more organisms 

 predominated in the neuston layer. Average abundance in the 

 region was 17,238 specimens/m' (Table 6) which is almost 

 7 times less than in the east and 3.2 times less than in the south. 



Copepods dominated in the Gulf of Anadyr similar to 

 above-mentioned polygons, making up about 91%. In this 

 region, a large amount of detritus formed from dying 

 phytoplankton cells was found in zooneuston samples. A large 

 amount of organic matter suspended near the pelagic surface 

 layer possibly inhibited the development of neuston and was 

 one of the reasons for low indices. 



As to the Chirikov Gulf, foraminiferous. tintinnids. all 

 stages of ontogenesis of Oncea horealis, l-III stages of 

 copepodites of Calanus glacialis, and adult forms of Tortanus 

 and Epilahidocera were encountered only in the neuston layer. 



Similar to other regions of the Bering Sea. copepods (40% ) 

 prevailed in Chirikov Bay; however, here there were 

 significantly more zoobenthos larvae, especially the bivalves 

 (20%) and marine urchins (23%). 



The average number of organisms in the neuston layer of 

 Chirikov Gulf was 75.321 specimens/m\ which ranks second 

 after the East Polygon in the Bering waters studied (Table 7). 



The most northern water mass studied is the Chukchi Sea. 

 which has a quite diverse and abundant zooneuston. The 

 rotatorian Synchaeta, the hydrozoans Rathkea, Obelia, 

 Aglantlia, polychaete larvae, the pteropod Clione, larvae of 

 bivalves, cirripeds. ophiurans. and marine urchins, all stages of 

 ontogenesis of the copepods Aca/V/t/ longiremis, Pseudocalanus 



Abundance (specimens/m') of organisms 



in the neuston and subneuston layers 



of the Gulf of Anadyr of Bering Sea 



August 1-8, 1988. 



Station 

 Number 



Neuston 

 laver 



Subneuston 



layer 



TABLE 7 



Abundance of organisms (specimens/m') 



in the neuston and subneuston layers 



of Chirikov Gulf in the Bering Sea, 



August 19-23, 1988. 



minutus, Eutytemora pad flea, Eurytemora herdmani, Oithona 

 similis, eggs and nauplii of Calanus glacialis, nauplii of 

 Eucalanus hungii, nauplii and copepodite stages of Acartia 

 f(//?!/V/fl.furcilliaofeuphausiids.megalops of decapods, juvenile 

 polychaetes. and tunicates Oikopleura and Fritillaria 

 quantitatively predominated in the neuston layer. 

 Foraminiferous. the siphonophore Dimophyes arctica, 

 gastropod larvae. I-IIl copepodite stages of Eucalanus pacifica, 

 nauplii of Epilahidocera amihitrites, III-V copepodites of 

 Calanus plumchrus, hyperiids. eggs, and larvae of fish were 

 found in greater quantities in the neuston layer. 



In 86% of the cases, there were more organisms 

 predominating in the neuston layer (Table 8). 



Average abundance for hydrobionts in the 0-5 cm layers 

 was 43.464 specimens/m'. which is 1.5 times less than the 

 average abundance of organisms in this biotope of the Bering 

 Sea. 



187 



