Geotraverse across the Sikhote Alin ? The Sea of Japan ? The Honshu Island ? The Pacific

1985 ◽  
Vol 7 (3) ◽  
pp. 379-387 ◽  
Author(s):  
A. G. Rodnikov ◽  
A. G. Gainanov ◽  
B. V. Yermakov ◽  
V. M. Kovylin ◽  
V. A. Seliverstov ◽  
...  
Keyword(s):  
Sea Of Japan ◽  
The Sea Of Japan ◽  
Sikhote Alin ◽  
The Pacific ◽  
Honshu Island

scholarly journals Long-term ocean acidification trends in coastal waters around Japan

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hiroshi Ishida ◽  
Ryosuke S. Isono ◽  
Jun Kita ◽  
Yutaka W. Watanabe
Keyword(s):  
Pacific Ocean ◽  
Ocean Acidification ◽  
Sea Of Japan ◽  
Ocean Current ◽  
The Sea Of Japan ◽  
Marginal Seas ◽  
The Pacific ◽  
Activity Measurements ◽  
The Pacific Ocean

AbstractThis study examines long-term ocean pH data to evaluate ocean acidification (OA) trends at two coastal research institutions located on the Sea of Japan and the Pacific Ocean. These laboratories are located away from the influences of large rivers and major industrial activity. Measurements were performed daily for the past 30 years (1980s–2010s). The average annual ocean pH for both sites showed generally negative trends. These trends were – 0.0032 and – 0.0068 year–1 (p < 0.001) at the Sea of Japan and Pacific Ocean sites, respectively. The trends were superimposed onto approximately 10-year oscillations, which appear to synchronize with the ocean current periodicity. At the Sea of Japan site, the ocean pH in the summer was higher, and the rate of OA was higher than during other seasons. Our results suggest that seasonality and ocean currents influence OA in the coastal areas of open oceans and can affect the coastal regions of marginal seas.

scholarly journals Henricia djakonovisp. nov. (Echinodermata, Echinasteridae): a new sea star species from the Sea of Japan

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e2863 ◽  
Author(s):  
Anton Chichvarkhin
Keyword(s):  
New Species ◽  
Sea Of Japan ◽  
Common Species ◽  
Sympatric Species ◽  
Variable Number ◽  
The Other ◽  
The Sea Of Japan ◽  
Sea Star ◽  
The Pacific ◽  
Russian Waters

A new sea star species,H. djakonovisp.n., was discovered in Rudnaya Bay in the Sea of Japan. This is a sympatric species of the well-known and common speciesHenricia pseudoleviusculaDjakonov, 1958. Both species are similar in body size and proportions, shape of skeletal plates, and life coloration, which distinguishes them from the otherHenriciaspecies inhabiting the Sea of Japan. Nevertheless, these species can be distinguished by their abactinal spines: in both species, they are short and barrel-like, but the new species is the onlyHenriciaspecies in Russian waters of the Pacific that possesses such spines with a massive, smooth, bullet-like tip. The spines inH. pseudoleviusculaare crowned with a variable number of well-developed thorns. About half (<50%) of the abactinal pseudopaxillae in the new species are oval, not crescent-shaped as inH. pseudoleviuscula.

Acquisition de cnidocystes et différenciation de pseudocolloblastes chez les larves et les adultes de deux cténophores du genre Haeckelia Carus, 1863

1989 ◽  
Vol 67 (9) ◽  
pp. 2169-2179 ◽  
Author(s):  
Danièle Carré ◽  
Claude Carré
Keyword(s):  
Mediterranean Sea ◽  
Sea Of Japan ◽  
Outer Layer ◽  
Glandular Cell ◽  
The Sea Of Japan ◽  
Unknown Type ◽  
The Pacific ◽  
New Type ◽  
The Mediterranean

The development of two species of cydippid Ctenophora, Haeckelia rubra and Haeckelia bimaculata, was studied to determine the origin and acquisition of exogenous cnidocysts in these two species, which lack colloblasts. A new type of cell, the pseudocolloblasts, is described. In H. rubra, the outer layer of the egg contains cnidocysts which are ingested by the larva after gastrulation; these cnidocysts make up the initial stock of exogenous cnidocysts that will allow the ctenophore to catch its first Cnidaria. In H. bimaculata, the outer layer of the egg is devoid of cnidocysts. The hatching larva has no cnidocysts either, but its tentacles are lined by an hitherto unknown type of glandular cell that we have named the pseudocolloblast. Pseudocolloblasts are composed of a secretory head bearing regularly interspaced, striated structures and an anchoring stalk. They eject their content progressively during successive phases of exocytosis. Pseudocolloblasts differ morphologically from real colloblasts, but they probably have the same function and they allow larvae of H. bimaculata to catch cnidarian larvae and thus acquire the exogenous cnidocysts present in postlarval and adult stages. Cnidocysts are identical in both species of Haeckelia in the Mediterranean Sea, consisting of macroisorhizas and microisorhizas in which the intracapsular filament has five circumferential pleats, a character typical of Narcomedusae. They differ in size from the cnidocysts found in H. rubra in the Pacific and in the Sea of Japan.[Journal translation]

scholarly journals Impact of a climate regime shift on the migration of Japanese common squid (Todarodes pacificus) in the Sea of Japan

2010 ◽  
Vol 67 (7) ◽  
pp. 1314-1322 ◽  
Author(s):  
Hideaki Kidokoro ◽  
Tsuneo Goto ◽  
Toru Nagasawa ◽  
Hiroshi Nishida ◽  
Tatsuro Akamine ◽  
...  
Keyword(s):  
Sea Of Japan ◽  
Regime Shift ◽  
The Sea Of Japan ◽  
Climate Regime ◽  
Spawning Grounds ◽  
Climate Regime Shift ◽  
Todarodes Pacificus ◽  
Common Squid ◽  
Japanese Common Squid ◽  
Honshu Island

Abstract Kidokoro, H., Goto, T., Nagasawa, T., Nishida, H., Akamine, T., and Sakurai, Y. 2010. Impact of a climate regime shift on the migration of Japanese common squid (Todarodes pacificus) in the Sea of Japan. – ICES Journal of Marine Science, 67: 1314–1322. Following a climate regime shift (RS) in 1989 in the northwest Pacific and Sea of Japan, the main spawning grounds of the Japanese common squid (Todarodes pacificus) shifted from inshore areas off Honshu Island to the Tsushima Strait, and the stock size increased. Migration patterns of T. pacificus occurred after the RS, based on tagging experiments conducted in July to September of 1984 and 1987–1991, are examined using monthly shifts in average latitude of recapture sites every 10 d. Before the RS, recaptures were in the central Sea of Japan and in inshore areas off Honshu Island, but after the RS, there were no recaptures inshore off Honshu Island. The average latitude of the recapture sites in September was about 36–37°N before the RS and north of 40°N (near the release sites) after the RS. It is likely that the location of the spawning grounds has changed.

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