In some of them e.g., angler fish (Melanocetus) and gulper eel (Eurypharynx) the water content is very high, about 95%. Some bathypelagic fishes are economy’ designs showing reduction of bony skeletons except for their jaws and contain watery muscles. Due to extreme pressure the bodies i deep-sea fish and other animals are very much compressed.
The amount of detritus coming into deeper waters depends on seasonal production cycles at the surface. Because of lack of cues like light and temperature change, it was once thought that there was no seasonality in the deep sea, but this is not so. It is characterized by high pressure, low temperature, absence of light, calmness of water, absence of phytoplankton and other producers, scarcity of food and resulting competition and soft bottom.Īpart from containing bacteria and perhaps fungi, the community of aphotic zones is characteristically animal.
0 kommentar(er)
