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Kind of food waste

2019-08-19 来源: 51Due教员组 类别: Paper范文

下面为大家整理一篇优秀的paper代写范文- Kind of food waste,供大家参考学习,这篇论文讨论了种内残食。当外界条件严酷,生物为了生存和发展,就会进行种内斗争。种内斗争残酷的结局,就是种内残食。在自然界中不同种群之间相互残食属于正常的自然现象,但在同种群生物个体之间的残食现象也屡见不鲜,不但在凶残的肉食动物种群内发生残食现象,而且在植食动物的种群内也经常发生残食现象。

In nature, mutual cannibalism among different populations is a normal natural phenomenon, but it is also common among individuals of the same population. It occurs not only in the population of ferocious carnivores, but also in the population of herbivores.

When the external conditions are harsh, organisms fight for survival and development within species. The cruel end of intraspecific struggle is intraspecific cannibalism. For example, in some water bodies, if there are no other fish than bass, the adults of the bass will feed on the larvae of the species. During the harsh winter months, when wolves cannot find prey, they feed on the weak, sick or young. This is the animal out of survival instinct, forced by the helpless, in the population of the law of the jungle. Intraspecific cannibalism also occurs when there is plenty of food in the environment, the population number increases, and the population density increases. For example, in the breeding of captive scorpions and centipedes, they always look for a secluded corner to lay eggs, while some similar individuals take advantage of the reduced self-defense ability of the spawnery to kill, cannibalize their own species and occupy the nest of their victims. But if they are being nursed and attacked by their own kind, the aggressor will most likely be eaten by the nest owner.

Sometimes, the external environment conditions are good, the animals have a good life, do not lack any living conditions, also often occur intra-species cannibalism phenomenon. For example, fabre, a famous French entomologist, once described that certain species of necrophage can live in harmony in their youth, but when they grow old, they start to cannibalize each other until they are exhausted. According to fabre, this phenomenon is an anomaly when creatures are exhausted, when they reach the point of exhaustion. In addition, wolves, sharks and other animals, regardless of external conditions, they will cannibalize the injured companions. It follows that this cannibalism is by no means a unique, accidental anomaly, and is purely due to the murderous nature of carnivores.

In the kuru highlands of New Guinea, adult men eat the brains of the dead. This is a tribal burial ritual. In the history of human development, there used to be cannibal tribes, whose cannibalism was mainly due to beliefs, sacrifices and other customs. Herbivores don't eat each other, do they? Not really. Flying locusts are plant-eating insects, but when a female grasshopper encounters a dead male, she will feed him a meal without mercy. This seems to give us a hint that the ancestors of locusts were once carnivores or omnivores, and had the habit of cannibalism.

Female mantises have no qualms about savoring their mates when or after they mate. Faber even observed that within two weeks, the same female ate seven of her mated males. Certain species of spiders, scorpions, centipedes, etc. Some people believe that cannibalism is caused by females being stronger than males, resulting in predatory females. So why do the males of these animals fight fiercely for mates, but not fight back when eaten by their mates? Many believe it is for the nutritional needs of laying eggs or giving birth, so why, in captivity where food is unusually plentiful, do females prefer the bodies of their lovers? Others think it is to make room for the offspring. The larvae of the mantis are not born until the following spring. Obviously, this is not reasonable. Based on observations and experiments, I think part of the reason is the need to reproduce -- by cannibalizing males that no longer function, reducing the number of individuals competing for food, the females are likely to have more food to feed their offspring. But the main reason may be accidental ingestion. When we raised the adults of the yellow mealworms, we found that if the eggs were not collected in time or mixed with the eggs in the feed, the yellow mealworms would eat them all indiscriminately. Obviously, yellow mealworm feeding eggs belong to accidental feeding. The female mantis, spider, scorpion that is in copulation period temperament is manic, appetite is exuberant, regard the partner that is under oneself control as prey to undertake by mistake feed, should be none odd long. More eloquently, different species use different but equally effective precautions to protect males from being eaten by mistake: some males tie up their females before mating; Some have special appendages that are used to plug up the female's open mouthparts during mating. Some bring their silk-wrapped prey to the female first and mate with her while she is busy eating.

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