|Several jellyfish floating in the sea. © image: Istockphoto.com/leru|
Why the number is increasing? Biologists warn of the spread of dangerous species. Experts are worried that more and more jellyfish abound in our seas. Also in the Mediterranean so many jellyfish are like never before traveling. Biologists are concerned that there is a spread of dangerous species. The possible causes of the rising number of sea creatures are known to experts. A large bear responsibility, especially men.
Contribute What causes the explosive proliferation of jellyfish and how the survival tricks of the dangerous beauty of the sea look:
1. No new phenomenon
It is clear that plagues of jellyfish in European beaches are nothing new. Depending on the reproduction cycle of the cnidarians, the flow volume of the water and temperature, thousands of animals are washed ashore, especially in summer months repeatedly. Because jellyfish belong to the group of plankton and are carried by the water flow, the animals are not able to determine their own itinerary through the seas themselves.
2. The responsibility of the people
Jellyfish plagues are strongly influenced by human intervention in the marine environment. The global overfishing and the resulting drop in natural enemies are as mitbestimmend such as global warming, which has led to an explosion in certain particularly robust species. Because jellyfish are survivalists who can also adapt to the most adverse circumstances. Since 600 million years drive the transparent cnidarians, which consist of 98 percent water, our oceans - in almost unchanged form.
The overfishing jellyfish often lack the natural enemies. Climate change favors, according to experts, in addition to the rise of toxic species northwards. Many animals go through the widened recently there.
3. Toxic hunting
The hunting techniques are the ones that make many people afraid of jellyfish. Because a few millimeters up to several meters large animals hunt their prey - fish and plankton - mostly by their poison tentacles. Poison that can be threatening for humans. While living in the Mediterranean Sea jellyfish species cause previously rarely more than burning and itchy hives, other Medusenarten can sometimes be fatal beauties. Off the coasts of Australia about living the most toxic seafood earth - the sea wasp. With 60, up to two meters long tentacles the rangy and almost translucent jellyfish venom burns in the skin of their prey. The result: Within a few minutes skeletal and cardiac muscle, and breathing become paralyzed. The venom of the sea wasp is so aggressive that more people every year die from it than by shark attacks.
Helps contact with the sea wasp only a quickly administered antidote satisfy simpler measures in conventional species of jellyfish. So experts recommend following an involuntary contact with a jellyfish may still stuck tentacles to solve with vinegar, rub the affected area with sand and then cool with cold compresses or ice cubes.
4. Eternal life.
That the simple but for millions of years proven and highly successful design principle of jellyfish is gradable, the research findings of an Italian marine biologists confirm. Ferdinand Boero of the University of Lecce discovered years ago in the Mediterranean a new jellyfish. The peculiarity of Turritopsos nutricula: eternal life. If the body cells of the small jellyfish in the course of their lives older and die, so it is possible the animal sink to the ocean floor. There will lose all your nerve and stinging cells their function, and from the jellyfish to a new, young animal forms. The unique in the animal world process always repeats itself, once the organism of jellyfish is old - for all eternity.