GRE写作Issue部分精品素材分享之野生动物

2015年08月14日17:47 来源：小站整理

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控制野生动物危害

The primary objective of any control program should be to reduce damage in a practical, humane and environmentally acceptable manner. Wildlife managers and wildlife control operators base control methods on the habits and biology of the animals causing damage, in order that their efforts will be more effective and will serve to maximize safety to the environment, humans and other animals.

A key to controlling wildlife damage is prompt and accurate determination of which animal is causing the damage. Even someone with no training or experience can often identify the pest by thoroughly examining the damaged area. Because feeding indications of many wildlife species are similar, other signs—such as droppings, tracks, burrows, nests or food caches—are usually needed to make a positive species identification.

控制有害野生动物的合适方法

After you properly identify the wildlife pest, you can choose control methods appropriate to the animal species involved. Improper control methods may harm but not kill the animal, causing it to become leery of those and other methods in the future. For example, using traps and poison baits improperly or in the wrong situation may teach the animal that the control method is harmful. This may make the animal difficult to control later, even with the correct method. Four steps lead to a successful nuisance wildlife control program:

1. Correctly identify the species causing the problem.

2. Alter the habitat, if possible, to make the area less attractive to the wildlife pest.

3. Use a control method appropriate to the location, time of year, and other environmental conditions.

4. Monitor the site for re-infestation in order to determine if additional control is necessary.

The most commonly used methods for controlling nuisance wildlife around homes and gardens include exclusion, habitat modification, repellents, toxic baits, glue boards, traps and frightening.

转基因生物

A Genetically Modified Organism (GMO) is an organism whose genetic material has been altered using the genetic engineering techniques generally known as recombinant DNA technology. Genetically Modified (GM) crops today have become a common source for genetic pollution, not only of wild varieties but also of other domesticated varieties derived from relatively natural hybridization.

It is being said that genetic erosion coupled with genetic pollution is destroying that needed unique genetic base thereby creating an unforeseen hidden crisis which will result in a severe threat to our food security for the future when diverse genetic material will cease to exist to be able to further improve or hybridize weakening food crops and livestock against more resistant diseases and climatic changes.