Polychaete worms (polychaetes, a type of round worms) usually occur in the coastal zone. Buried in the sand, they expect the tide to lean out from his hiding place. These are pushily – the inhabitants of the sandy shallows. But there is deep-sea polychaetes, such as Nereid pelagic, living in the soft mud in the depths of the White sea.
“Pelagic” is called the organisms living in the pelagic – in the water or on its surface. Why is the bottom dweller of the Nereid called pelagic? It turns out that once a year, in summer, long Arctic day, all Nereids float to the surface to spawn. It is unclear how the worms managed to simultaneously leave their homes and that is their signal to the ascent. Spawning Nereids light for fish and marine birds – “time to eat”. Caviar Nereids eating not only animals. Fried eggs this large worm, similar in flavor to fried, is a favorite dish of the locals.
ANGEL, DEVOURING THE HELL
Far from shore in the water column hovering angel. This is a small krilangi clam, smoothly waving translucent pinkish wings – outgrowths on the foot. Angelfish hovers vertically in the water, amazing grace. Looking at this miracle, and not think that before us is a voracious predator, the main production of which smaller predator – krilangi clam monkfish.
Monkfish malchevskogo angel and painted, as befits the devil, in black color. His defense is a fragile shell, where he hides when in danger. But the angel of the sea shell is not a hindrance. Easily destroying its tentacles, pulls the angel in the hell mouth. In translucent the body of Angela long will be seen the traces of “black Affairs” – the remains swallowed by hell. Continue reading
The main feature of the water balance of the Black sea is a significant excess river runoff (river in the sea bring about 355 km 3 of water per year) and precipitation over evaporation, so the water level in the Black sea 9-12 cm higher than the Mediterranean sea. Elevated levels constant due to surface runoff from the Black sea of Marmara. Surface runoff and prevailing North-easterly winds are the main pathogens circular system of currents in the Black sea clockwise, emerging in the North-Western part. Tidal currents in the Black sea is weak, the oscillation amplitude no more than 8 cm, Often they are clouded wind-tide phenomena.
Demersal waters over the Mediterranean, flowing through the Bosporus (Marmara from the Black sea to flow over the year of around 193 km 3 of water) Strait and spreading over the deep basin, plays a significant role in the hydrological regime of the Black sea. Waters of the Mediterranean sea are higher than the average oceanic salinity (about 38%), the density is much greater than the freshened surface water (to 1,017). This leads to the stable layer-by-layer shallow water, poor mixing, different as salt, temperature and gas regimes of these layers. Thus, the salinity in niinemaa (deeper than 150-200 m) in the Black sea up to 22 % 0 and slightly more at the bottom and in tribesperson area. The surface layers have a salinity of 17-18%, declining to 16%on the coast and up to 13% 0 th North-Western part of the sea. There is water exchange between the Black and Azov seas.
The water temperature of the upper layer in summer in the open sea reaches 25°, and in the shallow waters and in estuaries up to 28° C. At depths of 100-200 m and deeper temperature do not experience seasonal changes and to the bottom remains constant year round (about 8-9°). In winter, the surface waters of the Black sea are very cool, but only in the North-West and North-East areas the temperature can drop below zero (to -1.4°), with the sea in some years is covered with ice. Throughout the rest of the sea, and especially in the southern parts, the surface layers retain a temperature of about 8° C, i.e. equal to a constant temperature of depths, which impedes the convective mixing of waters even in the winter. Continue reading