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DỊCH TRANSCRIPT & GIẢI CHI TIẾT ĐỀ THI IELTS LISTENING CAMBRIDGE 11-TEST 1 - PART 4

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DỊCH TRANSCRIPT & GIẢI CHI TIẾT ĐỀ THI IELTS LISTENING CAMBRIDGE 11-TEST 1 - PART 4

 

Questions 31 – 40

Complete the notes below.

Write ONE WORD ONLY for each answer.

Ocean Biodiversity

Biodiversity hotspots

●   areas containing many different species

●   important for locating targets for 31……………

●   at first only identified on land

Boris Worm, 2005

●   identified hotspots for large ocean predators, e.g. sharks

●   found the ocean hotspots:

     –   were not always rich in 32………………

     –   had higher temperatures at the 33……………..

     –   had sufficient 34…………….. in the water

Lisa Ballance, 2007

●   looked for hotspots for marine 35……………..

●   found these were all located where ocean currents meet

Census of Marine Life

●   found new ocean species living:

     –   under the 36………………

     –   near volcanoes on the ocean floor

Global Marine Species Assessment

●   want to list endangered ocean species, considering:

     –   population size

     –   geographical distribution

     –   rate of 37……………….

●   Aim: to assess 20,000 species and make a distribution 38………………. for each one

Recommendations to retain ocean biodiversity

●   increase the number of ocean reserves

●   establish 39……………… corridors (e.g. for turtles)

●   reduce fishing quotas

●   catch fish only for the purpose of 40……………..

SCRIPTS

I’ve been looking at ocean biodiversity, that’s the diversity of species that live in the world’s oceans. About 20 years ago biologists developed the idea of what they called ‘biodiversity hotspots’. These are the areas which have the greatest mixture of species, so one example is Madagascar. These hotspots are significant because they allow us to locate key areas for focusing efforts at conservation (Q31). Biologists can identify hotspots on land, fairly easily, but until recently, very little was known about species distribution and diversity in the oceans, and no one even knew if hotspots existed there.

Then a Canadian biologist called Boris Worm did some research in 2005 on data on ocean species that he got from the fishing industry. Worm located five hotspots for large ocean predators like sharks, and looked at what they had in common. The main thing he’d expected to find was that they had very high concentrations of food, but to his surprise that was only true for four of the hotspots – the remaining hotspots was quite badly off in that regard (Q32). But what he did find was that in all cases, the water at the surface of the ocean had relatively high temperatures, even when it was cool at greater depths (Q33), so this seemed to be a factor in supporting a diverse range of these large predators. However, this wasn’t enough on its own, because he also found that the water needed to have enough oxygen in it (Q34) – so these two factors seemed necessary to support the high metabolic rate of these large fish.

A couple of years later, in 2007, a researcher called Lisa Balance, who was working in California, also started looking for ocean hotspots, but not for fish – what she was interested in was marine mammals, things like seals (Q35). And she found three places in the oceans which were hotspots, and what these had in common was that these hotspots were all located at boundaries between ocean currents, and this seems to be the sort of place that has lots of the plankton that some of these species feed on.

So now people who want to protect the species that are endangered need to get as much information as possible. For example, there’s an international project called the Census of Marine Life. They’ve been surveying oceans all over the world, including the Arctic. One thing they found there which stunned other researchers was that there were large numbers of species which live below the ice (Q36) – sometimes under a layer up to 20 metres thick. Some of these species had never been seen before. They’ve even found species of octopus living in these conditions. And other scientists working on the same project, but researching very different habitats on the ocean floor, have found large numbers of species congregating around volcanoes, attracted to them by the warmth and nutrients there.

——————–

However, biologists still don’t know how serious the threat to their survival is for each individual species. So a body called the Global Marine Species Assessment is now creating a list of endangered species on land, so they consider things like the size of the population – how many members of one species there are in a particular place – and then they look at their distribution in geographical terms, although this is quite difficult when you’re looking at fish, because they’re so mobile, and then thirdly they calculate the rate at which the decline of the species is happening. (Q37)

So far only 1,500 species have been assessed, but they want to increase this figure to 20,000. For each one they assess, they use the data they collect on that species to produce a map showing its distribution (Q38). Ultimately they will be able to use these to figure out not only where most species are located but also where they are most threatened.

So finally, what can be done to retain the diversity of species in the world’s oceans? Firstly, we need to set up more reserves in our oceans, places where marine species are protected. We have some, but not enough. In addition, to preserve species such as leatherback turtles, which live out in the high seas but have their nesting sites on the American coast, we need to create corridors for migration, so they can get from one area to another safely. As well as this, action needs to be taken to lower the levels of fishing quotas to prevent overfishing of endangered species. And finally, there’s the problem of ‘by-catch’. This prefers to the catching of unwanted fish by fishing boats – they’re returned to the sea, but they’re often dead or dying. If these commercial fishing boats used equipment which was more selective, so that only the fish wanted for consumption were caught, this problem could be overcome.

OK. So does anyone have any …

 


1. Mua bộ đề gần 400 bài ielts reading - Dịch và giải chi tiết Chỉ 199k bao gồm toàn bộ đề trong bộ Cambridge ( từ bộ 1 -18) và nhiều đề thi thực tế ( xem danh sách 400 đề ielts reading tại đây). Xem bài mẫu tại đây, Bài mẫu 1, bài mẫu 2, bài mẫu 3. Giải đề bao gồm phần dịch bài đọc, dịch phần câu hỏi, giải thích chi tiết, có thể tải về, in phần đề để luyện tập. Để mua bộ đề. Vui lòng điền thông tin theo form tại đây và thanh toán theo thông tin CK trong form. 

2. Mua bộ đề Ielts listening từ Cam 10-18 - Dịch và giải chi tiết Chỉ 99k bao gồm phần dịch transcript, dịch câu hỏi, giải đề. Xem bài mẫu tại đây. Để mua bộ đề Vui lòng điền thông tin theo form tại đây và thanh toán theo thông tin CK trong form. 

3. Đặc biệt dành tặng 100 bạn hoàn thành buổi học thử miễn phí khóa học Ielts Speaking online 1 kèm 1, các bạn sẽ được tặng bộ đề 400k bài Ielts reading và bộ đề Ielts Listening bộ Cam từ 10-18 gồm bài dịch và giải chi tiết, giải thích từ vựng khó ( thời hạn sử dụng trong vòng 2 tháng). Xem thông tin khóa học Ielts Speaking online 1 kèm 1 và đăng ký học thử tại đây.

 


 

ANSWER

31   conservation

32   food/ foods

33   surface

34   oxygen/ O2

35   mammals

36   ice

37   decline / declining / decrease

38   map

39   migration

40   consumption

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