首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
earthworm本题有关从澳洲引入到苏格兰的物种的名称。录音原文中的all Australian species“一个澳洲物种”的言下之意即来自澳洲。
earthworm本题有关从澳洲引入到苏格兰的物种的名称。录音原文中的all Australian species“一个澳洲物种”的言下之意即来自澳洲。
admin
2022-03-29
85
问题
Good afternoon. I want this afternoon as an introduction to our ecology module to offer examples of exotic pests — non-native animals or plants which are, or may be, causing problems — which might prove a fruitful topic for seminar papers later in the term. People and products are crisscrossing the world as never before, and on these new global highways, plants and animals are traveling too.
Exotic plants and animals are turning up in Antarctica and on the most remote islands on Earth. For example, the Australian red-backed spider — it’s made its way to countries fairly near home, such as New Zealand and Japan, as some of you may know — well, it’s also been found on Tristan da Cunha, which is a remote island, thousands of miles from anywhere,
way out in the middle of Atlantic.
Now, another famous animal invader in the other direction, so to speak, from England to Australia in the southern hemisphere, is the rabbit. This was in 1830 and it might seem less of a threat, but it became an extraordinarily destructive pest. The fact that rabbits increased so rapidly is perhaps more understandable when we remind ourselves that they had originally been introduced to England from continental Europe eight centuries earlier.
This was because they were regarded as a luxury food source,
and in spite of having warm fur, they probably originated on the hot dry plains of Spain, which of course explains why they thrive in the climate of Australia.
A much less cuddly example of a pest introduced to Australia, this time from America, is fire ants. These are increasing and spreading very fast.
Their huge nests can now be found in gardens in the city of Brisbane
and they are costing the Australian government a great deal of money in control measures. These were an accidental introduction, rather than a deliberate one, brought to Australia, probably in horticultural imports or in mud on second-hand machinery.
As a biologist and conservationist, I have become increasingly concerned about these matters Exotic invasions are irreversible and deserve to be taken more seriously even when they aren’t particularly damaging. For example, something that is not necessarily a major disaster compared to other ecological experiments:
in 1975 an Australian species of earthworm was deliberately introduced to the northern hemisphere, in Scotland,
because they were bigger than the natives.
The aim was that they would be more effective than native species, but in fact, they don’t do more for the soil condition than the smaller locals which they displace.
Although they don’t do a lot of harm, as far as we know up to now, this will probably prove to have been a mistake.
A much more serious case, also in Scotland, as well as other countries, along with the latest victim, Iceland, is the New Zealand flatworm.
This is a most unwelcome newcomer in these regions of north-west Europe.
Basically, this flatworm came into these countries by accident.
It’s now been realised that it was actually carried in the plant pots
containing exotic ornamental shrubs and so on, and as it eats local earthworms, and doesn’t benefit the local ecology in any way, it is a real pest.
Next, there’s a further instance,
this time in the water and it’s come from Japan. It’s a delicious but very fast-spreading seaweed
and is one of many exotic species, large and small, in the seas covering the rocks around Australia. Unfortunately, it is replacing indigenous seaweeds and permanently altering the ecosystem. However, to look at the situation from a business point of view — it is now being harvested and exported, dried, back to Japan, its original home, where it’s particularly popular. So sometimes we may find accidental benefits from apparently harmful arrivals.
Well, you could say that world ecology is now going the same way as popular culture. Global music and fashions, food and drinks are taking over from local ones in every land. And in ecosystems, we find vigorous exotic invaders overwhelming native species and natural habitats.
But can we find any examples of invaders which appear to be a problem and then find that in fact they may not be such a big issue after all? We might take as an example a native of Australia, the budgerigar, the most common pet parrot in the world, of course. Because there have been many escapes over the years, it is now to be found flying about in feral flocks where the climate suits it. So,
these flocks of budgerigars have been getting very numerous in the south-east of the United States,
particularly in residential areas. People have been getting quite worried about this, but it has been observed that the size of the flocks has diminished somewhat recently.
The fact that they are smaller is thought to be due to the fact that new competitors for their habitat have arrived from other places.
That’s the last example for now. What I’d like you to consider is this: Is the planet Earth moving towards a one-word ecosystem? How far would it be a wholly bad development?
选项
答案
earthworm
解析
本题有关从澳洲引入到苏格兰的物种的名称。录音原文中的all Australian species“一个澳洲物种”的言下之意即来自澳洲。
转载请注明原文地址:https://kaotiyun.com/show/ty8O777K
本试题收录于:
雅思听力题库雅思(IELTS)分类
0
雅思听力
雅思(IELTS)
相关试题推荐
READINGWATSA.Inmanydevelopedcountriesliteracyskirtsareundersiege.Thisistrueeveninsocietieswhereaccesstop
Matcheachpersonwithanappropriatestatement,A-F.Writethecorrectletter,A-F,inboxes36-40onyouranswersheet.Li
TheFlavorIndustryA.Readthroughthenutritionalinformationonthefoodinyourfreezer,refrigeratororkitchenpantry,
LookatthearticleClubsforStudents.Whichclubwouldyoucontactforeachoftherequirementsbelow!Writetheappropriatel
THEKEYLESSSOCIETYA.StudentswhowanttoentertheUniversityofMontreal’sAthleticComplexneedmorethanjustaconvention
THEKEYLESSSOCIETYA.StudentswhowanttoentertheUniversityofMontreal’sAthleticComplexneedmorethanjustaconvention
Politiciansmayhave’misjudgedthepublicmood’because______
Whenisthedeadlineforhandingindissertations?Theprofessorsaysthatquestionnairesmaynotgetintervieweesreal______.
CircleFOURlettersA~G.WhichFOURactivitiesoftheUnionarementionedbythespeaker?(A)raisingmoneyforgoodcauses(B)po
mirror定位句为“Thereisagoldclockandagoldenframedvintagemirror.”。本题的解题方法与上两题相近,都是要凭借题目中出现的并列信息来进行判断。这道题一定要看清楚题目上的itemorder
随机试题
关于淋巴瘤的叙述,不正确的是
护士巡视病房时,发现某患者输液不滴,注射部位肿胀,主诉疼痛,无回血。因需长时间输液,要注意保护、合理使用血管,应选用
甲公司、乙公司2015年有关交易或事项如下:(1)1月1日,甲公司向乙公司控股股东丙公司定向增发本公司普通股股票1400万股(每股面值为1元,市价为15元),以取得丙公司持有的乙公司70%股权,实现对乙公司财务和经营政策的控制,股权登记手续于当日办理
以下指标中,()是属于地理细分。
三维体育健康观是指()。
王某与张某因发生纠纷互殴,致张某轻伤,当地公安分局经调查,作出对王某拘留15天的行政处罚,并责令王某赔偿张某2000元医疗费。王某向上级公安局申请复议,复议机关改变原公安分局的决定,让王某赔偿张某1000元。王某仍不服,向人民法院提起行政诉讼。经审理,法院
人一般都偏好醒目的颜色。在婴幼儿眼里,红、黄都是醒目的颜色,这与成人相同;但与许多成人不同的是,黑、蓝和白色是不醒目的。市场上红、黄色为主的儿童玩具,比同样价格的黑、蓝和白色为主的玩具销量要大。以上信息最能支持以下哪项结论?
The"standardofliving"ofanycountrymeanstheaverageperson’sshareofthegoodsandserviceswhichthecountryproduces.A
Nobodydeniestheimperativesoffood,shelter,defence,healthandeducation.
Ifyouexplainedthesituationtoyoursolicitor,he______abletoadviseyoumuchbetterthanIcan.
最新回复
(
0
)