2263 본문읽기 20
카테고리 없음2023. 5. 13. 20:47
728x90
반응형
2263-35
The animal in a conflict between attacking a rival and fleeing may initially not have sufficient information to enable it to make a decision straight away. If the rival is likely to win the fight, then the optimal decision would be to give up immediately and not risk getting injured. But if the rival is weak and easily defeatable, then there could be considerable benefit in going ahead and obtaining the territory, females, food or whatever is at stake. By taking a little extra time to collect information about the opponent, the animal is more likely to reach a decision that maximizes its chances of winning than if it takes a decision without such information. Many signals are now seen as having this information gathering or 'assessment' function, directly contributing to the mechanism of the decision-making process by supplying vital information about the likely outcomes of the various options.
2263-36
The fossil record provides evidence of evolution. The story the fossils tell is one of change. Creatures existed in the past that are no longer with us. Sequential changes are found in many fossils showing the change of certain features over time from a common ancestor, as in the case of the horse. Apart from demonstrating that evolution did occur, the fossil record also provides tests of the predictions made from evolutionary theory. For example, the theory predicts that single-celled organisms evolved before multi-celled organisms. The fossil record supports this prediction ― multi-celled organisms are found in layers of earth millions of years after the first appearance of single-celled organisms. Note that the possibility always remains that the opposite could be found. If multicelled organisms were indeed found to have evolved before single-celled organisms, then the theory of evolution would be rejected. A good scientific theory always allows for the possibility of rejection. The fact that we have not found such a case in countless examinations of the fossil record strengthens the case for evolutionary theory.
2263-37
In economics, there is a principle known as the sunk cost fallacy. The idea is that when you are invested and have ownership in something, you overvalue that thing. This leads people to continue on paths or pursuits that should clearly be abandoned. For example, people often remain in terrible relationships simply because they've invested a great deal of themselves into them. Or someone may continue pouring money into a business that is clearly a bad idea in the market. Sometimes, the smartest thing a person can do is quit. Although this is true, it has also become a tired and played-out argument. Sunk cost doesn't always have to be a bad thing. Actually, you can leverage this human tendency to your benefit. Like someone invests a great deal of money in a personal trainer to ensure they follow through on their commitment, you, too, can invest a great deal up front to ensure you stay on the path you want to be on.
2263-38
Simply maintaining yields at current levels often requires new cultivars and management methods, since pests and diseases continue to evolve, and aspects of the chemical, physical, and social environment can change over several decades. In the 1960s, many people considered pesticides to be mainly beneficial to mankind. Developing new, broadly effective, and persistent pesticides often was considered to be the best way to control pests on crop plants. Since that time, it has become apparent that broadly effective pesticides can have harmful effects on beneficial insects, which can negate their effects in controlling pests, and that persistent pesticides can damage non-target organisms in the ecosystem, such as birds and people. Also, it has become difficult for companies to develop new pesticides, even those that can have major beneficial effects and few negative effects. Very high costs are involved in following all of the procedures needed to gain government approval for new pesticides. Consequently, more consideration is being given to other ways to manage pests, such as incorporating greater resistance to pests into cultivars by breeding and using other biological control methods.
2263-39
The dynamics of collective detection have an interesting feature. Which cue(s) do individuals use as evidence of predator attack? In some cases, when an individual detects a predator, its best response is to seek shelter. Departure from the group may signal danger to nonvigilant animals and cause what appears to be a coordinated flushing of prey from the area. Studies on dark-eyed juncos (a type of bird) support the view that nonvigilant animals attend to departures of individual group mates but that the departure of multiple individuals causes a greater escape response in the nonvigilant individuals. This makes sense from the perspective of information reliability. If one group member departs, it might have done so for a number of reasons that have little to do with predation threat. If nonvigilant animals escaped each time a single member left the group, they would frequently respond when there was no predator (a false alarm). On the other hand, when several individuals depart the group at the same time, a true threat is much more likely to be present.
The animal in a conflict between attacking a rival and fleeing may initially not have sufficient information to enable it to make a decision straight away. If the rival is likely to win the fight, then the optimal decision would be to give up immediately and not risk getting injured. But if the rival is weak and easily defeatable, then there could be considerable benefit in going ahead and obtaining the territory, females, food or whatever is at stake. By taking a little extra time to collect information about the opponent, the animal is more likely to reach a decision that maximizes its chances of winning than if it takes a decision without such information. Many signals are now seen as having this information gathering or 'assessment' function, directly contributing to the mechanism of the decision-making process by supplying vital information about the likely outcomes of the various options.
2263-36
The fossil record provides evidence of evolution. The story the fossils tell is one of change. Creatures existed in the past that are no longer with us. Sequential changes are found in many fossils showing the change of certain features over time from a common ancestor, as in the case of the horse. Apart from demonstrating that evolution did occur, the fossil record also provides tests of the predictions made from evolutionary theory. For example, the theory predicts that single-celled organisms evolved before multi-celled organisms. The fossil record supports this prediction ― multi-celled organisms are found in layers of earth millions of years after the first appearance of single-celled organisms. Note that the possibility always remains that the opposite could be found. If multicelled organisms were indeed found to have evolved before single-celled organisms, then the theory of evolution would be rejected. A good scientific theory always allows for the possibility of rejection. The fact that we have not found such a case in countless examinations of the fossil record strengthens the case for evolutionary theory.
2263-37
In economics, there is a principle known as the sunk cost fallacy. The idea is that when you are invested and have ownership in something, you overvalue that thing. This leads people to continue on paths or pursuits that should clearly be abandoned. For example, people often remain in terrible relationships simply because they've invested a great deal of themselves into them. Or someone may continue pouring money into a business that is clearly a bad idea in the market. Sometimes, the smartest thing a person can do is quit. Although this is true, it has also become a tired and played-out argument. Sunk cost doesn't always have to be a bad thing. Actually, you can leverage this human tendency to your benefit. Like someone invests a great deal of money in a personal trainer to ensure they follow through on their commitment, you, too, can invest a great deal up front to ensure you stay on the path you want to be on.
2263-38
Simply maintaining yields at current levels often requires new cultivars and management methods, since pests and diseases continue to evolve, and aspects of the chemical, physical, and social environment can change over several decades. In the 1960s, many people considered pesticides to be mainly beneficial to mankind. Developing new, broadly effective, and persistent pesticides often was considered to be the best way to control pests on crop plants. Since that time, it has become apparent that broadly effective pesticides can have harmful effects on beneficial insects, which can negate their effects in controlling pests, and that persistent pesticides can damage non-target organisms in the ecosystem, such as birds and people. Also, it has become difficult for companies to develop new pesticides, even those that can have major beneficial effects and few negative effects. Very high costs are involved in following all of the procedures needed to gain government approval for new pesticides. Consequently, more consideration is being given to other ways to manage pests, such as incorporating greater resistance to pests into cultivars by breeding and using other biological control methods.
2263-39
The dynamics of collective detection have an interesting feature. Which cue(s) do individuals use as evidence of predator attack? In some cases, when an individual detects a predator, its best response is to seek shelter. Departure from the group may signal danger to nonvigilant animals and cause what appears to be a coordinated flushing of prey from the area. Studies on dark-eyed juncos (a type of bird) support the view that nonvigilant animals attend to departures of individual group mates but that the departure of multiple individuals causes a greater escape response in the nonvigilant individuals. This makes sense from the perspective of information reliability. If one group member departs, it might have done so for a number of reasons that have little to do with predation threat. If nonvigilant animals escaped each time a single member left the group, they would frequently respond when there was no predator (a false alarm). On the other hand, when several individuals depart the group at the same time, a true threat is much more likely to be present.
728x90
반응형
