+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The ecology of the calanus ponticus population in the deeper layer of its concentration in the black sea

, : The ecology of the calanus ponticus population in the deeper layer of its concentration in the black sea. Journal of Plankton Research 14(3): 447-458

The layer of daytime concentration of Calanus ponticus (VC and VI C) performing daily vertical migrations and the layer of 'winter stock' aggregation are confined to the depth of maximal gradient of the main pycnocline under an unusually sharp oxycline. The concentration layer thickness ranges from 2 to 20-30 m and the Calanus concentration in it is > 250 ind. m-3, sometimes being 3500 ind. m-3 and even more. The population in the concentration layer is divided into two ecological groups: I, feeding and migrating specimens of copepodite stages V and VI, their body lipid contents being 25-60 .mu.g min-1; and II, non-feeding and non-migrating specimens of copepodite stage V, their body lipid contents being 100-150 .mu.g ind.-1. The relationship with oxygen concentration was studied in both ecogroups. The experiments show that specimens of ecogroup II can exist at an oxygen concentration of 0.06 ml l-1, but at such concentration falling into anabiosis. They die at 0.04 ml O2 l-1. Estimates of respiration of the group II specimens ('winter stock') show that lipids they store are sufficient for 7 months' survival. Depth of Calanus concentration is determined by water density rather than concentration of oxygen.


DOI: 10.1093/plankt/14.3.447

Other references

Duhamel C.; Parent B.; Peillon C.; Guedon C.; Ducrotte P.; Lerebours E.; Colin R., 1991: Endoscopic injection of adrenaline for severe peptic ulcer haemorrhage in high surgical risk patients. Endoscopic adrenaline-hypertonic injection was attempted in 40 patients admitted for oesophagogastroduodenal ulcer haemorrhage unresponsive to conventional medical treatment and presenting with severe underlying disease or advanced age (< 80 ye...

Warter, J.; Metails, P.; Sacrez, A., 1964: Diagnostic Significance Of The Determination Of Lactic Dehydrogenase Isoenzymes. Gaceta Medica de Mexico 94: 1203-1214

Camblin, C.Christine.; Ledoux, K.; Boudewyn, M.; Gordon, P.C.; Swaab, T.Y., 2006: Processing new and repeated names: effects of coreference on repetition priming with speech and fast RSVP. Previous research has shown that the process of establishing coreference with a repeated name can affect basic repetition priming. Specifically, repetition priming on some measures can be eliminated for repeated names that corefer with an entity...

Reichel W.; Wigger W.; Mietzsch G.; Quellhorst E.; Scheler F., 1972: Differential diagnosis of the type of glomerulo nephritis that rapidly leads to renal insufficiency. Schlegel, B (Ed ) Verhandlungen Der Deutschen Gesellschaft Fuer Innere Medizin (Proceedings Of The German Association For Internal Medicine ) Wiesbaden, West Germany April 9-13, Xxviii+1666p Illus Verlag Von J F Bergmann: Muenchen, West Germany 1482-1485

Cooper, Aw, 1973: Notice to pecan growers and nurseryman relative to the naming and release of the Shoshoni pecan. Proceedings of annual convention of the Southeastern Pecan Growers Association: 6th 176-177

Boussac, Jean., 1908: Sur la distribution des niveaux et des facies du Mesonumrnulitique dans les Alpes. Compte Rendu de l'Academie des Sciences Paris, 147 1086-1089

Connolly, J.A.;, P.A.; Fischbach, G.D., 1982: Extracts of electric lobe and electric organ from Torpedo californica increase the total number as well as the number of aggregates of chick myotube acetylcholine receptors. Saline extracts prepared from the electric lobe, the electromotor nerves, and the electric organ (the electromotor system) of Torpedo californica increase the number of ACh receptors on uninnervated chick myotubes in culture, while extracts from T...

Luciani, G.Battista.; Viscardi, F.; Pilati, M.; Barozzi, L.; Faggian, G.; Mazzucco, A., 2008: Operative risk and outcome of surgery in adults with congenital valve disease. To define risk and outcome of surgery in adults with congenital valve disease (CVD), experience between 2002 and 2005 with 371 CVD operations (288 males, aged 56 +/- 9 years) was compared with 2102 for acquired valve disease (AVD) (69 +/- 22 years...

Maddux, H.R.; Varia, M.A.; Spann, C.O.; Fowler, W.C.; Rosenman, J.G., 1990: Invasive carcinoma of the uterine cervix in women age 25 or less. The incidence of cervix cancer in young women appears to be increasing. However, the influence of young age on prognosis remains unknown. There is almost no information on the prognosis of very young women, age 25 years or less, with invasive cerv...

Biswas, S.; Mukhopadhyay, P.; Saha, SK., 1995: Insecta: Coleoptera: Adephaga: family Gyrinidae and family Haliplidae. Unknown