The distinction between nekton and plankton is not always sharp. They are the main predators in most marine food webs. The nekton are active swimmers and are often the most famous organisms in sea waters. Phytoplankton carries out photosynthesis, while zooplankton is represented by heterotrophic consumers. Plankton can be classified into phytoplankton, zooplankton and microbes (bacteria). Most planktonic protists are eukaryotes, predominantly unicellular organisms. Plankton are represented by a wide variety of organisms such as algae, bacteria, protozoa, larvae of some animals and crustaceans. They live off the nutrients in seawater and through photosynthesis. However, most planktonic organisms are animals less than 1 millimeter in length. Plankton range in size from tiny microbes that are 1 micrometer long to jellyfish, whose gelatinous bell can be up to 2 meters wide and whose tentacles can extend over 15 meters. However, not all species go with the flow, many forms can control their movements, and their survival depends almost entirely on their independence. Most of the plankton spends their existence swimming with the ocean currents. The term plankton is derived from the Greek planktos, which means wandering or drifting. They are essential components of the aquatic food webs, as they provide food for nekton (crustaceans, fish and squid) and benthos.They also have a global impact on the biosphere, as the balance of the components of the Earth's atmosphere is highly dependent on their photosynthetic activities. Plankton are microscopic inhabitants of the pelagic environment. It includes tiny animals and fish larvae. Zooplankton that feeds on phytoplankton.Phytoplankton, which produces food through photosynthesis.Most plankton species are too small to be seen with the naked eye. The other two groups are nekton (actively swimming animals) and benthos (these are living organisms that inhabit the bottom). When you imagine life in the ocean, then usually all associations are somehow associated with fish, although in fact fish is not the most common form. Plankton is the most common form of life in the aquatic environment Benthos are organisms that live on the ocean floor and include plants, animals and bacteria. Some of these creatures, such as lobsters and snails, can move on their own along the bottom, but their lifestyle is so strongly tied to the ocean floor that they would not be able to survive away from this environment. This group includes lobsters, starfish, worms of all kinds, snails, oysters, and many more. What is benthos? The third type of marine animals that spend their entire life at the bottom of the ocean. This large-scale category includes a number of very diverse creatures that are very different from each other in many ways. A variety of fish, octopuses, whales, moray eels, dolphins and squids are all examples of nekton. The nekton class makes up the largest part of the animals living in the ocean. Zooplankton can also include temporary larval forms of organisms that can grow and leave plankton communities and join groups such as nekton, benthos. Zooplankton is represented by drifting animals, which are usually small in size, but can grow to quite large sizes (for example, jellyfish). They are divided into three groups: plankton, nekton, benthos. It includes animals that are ecologically associated with the bottom, including many echinoderms, benthic fish, crustaceans, molluscs, annelids, and so on. Benthos are organisms found in the lowest layers of aquatic habitats. Necton consists of animals that can actively swim and dive in the water, these are fish, turtles, whales, sharks and others. Plankton is formed by algae and small animals that swim near the surface of the water. Plankton, nekton, benthos are three groups into which all aquatic living creatures can be divided.
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