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questions :Trophic level
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[Member (365WT)]answers [Chinese ]Time :2019-11-11
Autotrophic organisms are at the beginning of the food chain and together constitute the first trophic level. All animals that feed on producers (mainly green plants) are at the second trophic level, ie the vegetative level of herbivores. The third trophic level includes all carnivores that feed on herbivores. And so on, there will be a fourth trophic level and a fifth trophic level.

Since the energy is greatly reduced when flowing through the various nutrient levels, the next nutrient level can receive only 10% to 20% of the energy of the previous nutrient level, so the food chain cannot be too long. The trophic level in the ecosystem is not too long, generally only four or five, and rarely more than six.
Generally speaking, the higher the trophic level, the less the species, quantity and energy belonging to this trophic level. When a trophic level of biological species, quantity and energy is less than a certain degree, it is impossible to maintain another A trophic level exists.
From the producer's point of view, the organisms that obtain food through the same series are called trophic-level organisms, but the relationship of their food chains in the community or ecosystem is complex, except for producers and some food-eligible parts of the herbivores. Most other organisms are more or less belong to more than 2 trophic levels, and their trophic levels often vary with age and conditions. For example, wide fins feed on insects and algae; sweetfish grow with them. From secondary consumers to primary consumers: animal feeding in the seed stage, and conversion to plant feeding and omnivorous as the individual develops. The larvae feed on the horns and copepods and other small crustaceans, which continue Going upstream.During the trip to the river, the feeding organs evolved and the feeding gradually changed to lower algae...

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