. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE SEA OF OKHOTSK 793 Table 316. Vertical distribution of phytoplankton biomass and temperature ranges in central part of Sea of Okhotsk during the spring bloom Depth, m 0 10 25 50 Biomass, mg/m3 1,200 1,600 110 30 Temperature, °C 10-90 — — 1-58 The vertical distribution of Okhotsk plankton is greatly affected by the presence of the cold intermediate layer. Plankton biomass decreases markedly at depths of 40 to 50 m {Table 316), increasing again below the cold layer (at 100 to 150 m). This is clea
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE SEA OF OKHOTSK 793 Table 316. Vertical distribution of phytoplankton biomass and temperature ranges in central part of Sea of Okhotsk during the spring bloom Depth, m 0 10 25 50 Biomass, mg/m3 1,200 1,600 110 30 Temperature, °C 10-90 — — 1-58 The vertical distribution of Okhotsk plankton is greatly affected by the presence of the cold intermediate layer. Plankton biomass decreases markedly at depths of 40 to 50 m {Table 316), increasing again below the cold layer (at 100 to 150 m). This is clearly seen from specimens collected from the central part of the Sea during the spring bloom (Fig. 395) (M. Vinogradov, 1954). This vertical distribution of plankton is consistent with the changes of temperature. The sinking of phytoplankton and the vertical migration of zoo- plankton is restricted by the high range of temperature and density in the upper and lower limits of the cold intermediate layer. Oithona similis and Pseudocalanus elongatus are adapted to the surface zone (M. Vinogradov, 1954). Zooplankton organisms, which are capable of diurnal and seasonal vertical migrations into the upper layer of the Sea, characterize the transi- tional cold zone. They are composed mainly o\ Calanus tonsus (), ? finmarchicus and C. cristatus, Eucalanus bungii, Metridia okhotensis and, to a lesser extent, M. pacifica and Oncea borealis. The number of species in the deep layers is much higher, and some of them do not penetrate at all into the upper two horizons. These forms may be divided into two groups, those which migrate, and those which do not. The first group includes species living BIOMASS, g/m3 ? to ?? ??. BIOMASS, g/m3 0 0,5 1,0 (5 m wo ??? a /ooo ????. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
Size: 1221px × 2046px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber797
