Shadowing Practice: Cambridge IELTS 17 Test 4 Reading passage 1 - Learn English Speaking with Video
Les maken...
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Bats to the Rescue How Madagascar's bats are helping to save the rainforest.
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There are few places in the world where relations between agriculture and conservation are more strained.
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Madagascar's forests are being converted to agricultural land at a rate of 1% every year.
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Much of this destruction is fueled by the cultivation of the country's main staple crop, rice.
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And a key reason for this destruction is
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that insect pests are destroying vast quantities of what is grown by local subsistence farmers, leading them to clear forests to create new paddy fields.
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The result is devastating habitat and biodiversity loss on the island, but not all species are suffering.
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In fact, some of the island's insectivorous bats are currently thriving, and this has important implications for farmers and conservationists alike.
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Enter University of Cambridge zoologist Ricardo Rocha.
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He's passionate about conservation and bats.
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More specifically, he's interested in how bats are responding to human activity and deforestation in particular.
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Rocha's new study shows
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that several species of bats are giving Madagascar's rice farmers a vital pest control service by feasting on plagues of insects.
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And this, he believes, can ease the financial pressure on farmers to turn forest into fields.
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Bats comprise roughly one-fifth of all mammal species in Madagascar and 36 recorded bat species are native to the island,
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making it one of the most important regions for conservation of this animal group anywhere in the world.
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Co-leading an international team of scientists, Rocha found
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that several species of indigenous bats are taking advantage of habitat modification to hunt insects swarming above the country's rice fields.
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They include the Malagasy mouse-eared bat, Major's long-fingered bat, the Malagasy white-bellied free-tailed bat, and Peters' wrinkle-lipped bat.
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These winter species are providing a valuable free service to Madagascar as biological pest suppressors, says Rocha.
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We found that six species of bat are preying on rice pests, including the paddy-swarming caterpillar and grass webworm.
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The damage which these insects cause puts the island's farmers under huge financial pressure, and that encourages deforestation.
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The study, now published in the journal Agriculture, Ecosystems, and Environment, set out to investigate the feeding activity of insectivorous bats in
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the farmland bordering the Rana Mofana National Park in the southeast of the country.
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Rocha and his team used state-of-the-art ultrasonic recorders to record over a thousand bat-feeding buzzes, echolocation sequences used by bats to target their prey,
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at 54 sites, in order to identify the favorite feeding spots of the bats.
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They next used DNA barcoding techniques to analyze droppings collected from bats at the different sites.
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The recordings revealed that bat activity over rice fields was much higher than it was in continuous forest, seven times higher over rice fields which were on flat ground,
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and 16 times higher over fields on the sides of hills, leaving no doubt that the animals are preferentially foraging in these man-made ecosystems.
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The researchers suggest that the bats favor these fields
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because lack of water and nutrient runoff make these crops more susceptible to insect pest infestations.
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DNA analysis showed that all six species of bat had fed on economically important insect pests.
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While the findings indicated that rice farming benefits most from the bats, the scientists also found indications that the bats were consuming pests of other crops,
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including the black twig borer, which infests coffee plants, the sugarcane cicada, the macadamia nut borer, and the sober tabby,
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a pest of citrus fruits.
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The effectiveness of bats as pest controllers has already been proven in the USA and Catalonia, said co-author James Kemp from the University of Lisbon.
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But our study is the first to show this happening in Madagascar, where the stakes for both farmers and conservationists are so high,
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local people may have a further reason to be grateful to their bats.
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While the animal is often associated with spreading disease, Rocha and his team found evidence that Malagasy bats feed not just on crop pests,
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but also on mosquitoes, carriers of malaria, Rift Valley fever virus and elephantiasis, as well as blackflies, which spread river blindness.
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Rocha points out that the relationship is complicated.
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When food is scarce, bats become a crucial source of protein for local people.
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Even the children will hunt them.
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And as well as roosting in trees, the bats sometimes roost in buildings, but are not welcomed there because they make them unclean.
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At the same time, however, they are associated with sacred caves and their ancestors, so they can be viewed as beings between worlds,
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which makes them very significant in the culture of the people.
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And one potential problem is that while these bats are benefiting from farming, at the same time deforestation is reducing the places where they can roost,
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which could have long-term effects on their numbers.
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Rocha says, With the right help, we hope that farmers can promote this mutually beneficial relationship by installing bat houses.
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Rocha and his colleagues believe that maximizing bat populations can help to boost crop yields and promote sustainable livelihoods.
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The team is now calling for further research to quantify this contribution.
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I'm very optimistic, says Rocha.
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If we give nature a hand, we can speed up the process of regeneration.
📺 Zelfde Kanaal
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Woordenschat en spreektips bij deze les
Deze spreekles op niveau B2 is gebaseerd op de video “Cambridge IELTS 17 Test 4 Reading passage 1”. Deze woorden komen het vaakst terug: bat, pest, Rocha, species, farmers. Deze video bevat 53 zinnen en 881 woorden om na te spreken. Het gesproken deel duurt 5:18. De spreker praat in een natuurlijk tempo van ongeveer 166 woorden per minuut, dicht bij een alledaags gesprek. Slechts 71% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
De 15 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| pest zelfstandig naamwoord | /pɛst/ | pest, plaag |
| farmer zelfstandig naamwoord | /ˈfɑɹ.mɚ/ | boer, boerin |
| insect zelfstandig naamwoord | /ˈɪn.sɛkt/ | insect, kerfdier |
| crop zelfstandig naamwoord | /kɹɑp/ | gewas, voedselgewas |
| deforestation zelfstandig naamwoord | /dɪˌfɒɹɪsˈteɪʃən/ | ontbossing |
| insectivorous bijvoeglijk naamwoord | /ˌɪnsɛkˈtɪv(ə)ɹəs/ | insectenetend |
| swarm zelfstandig naamwoord | /swɔɹm/ | zwerm |
| paddy zelfstandig naamwoord | /ˈpædi/ | rijstveld |
| ecosystem zelfstandig naamwoord | /ˈikoʊˌsɪstəm/ | ecosysteem |
| prey zelfstandig naamwoord | /pɹeɪ/ | prooi |
| ancestor zelfstandig naamwoord | /ˈæn.sɛs.tɚ/ | voorouder |
| biodiversity zelfstandig naamwoord | /ˌbaɪoʊdəˈvɚsəti/ | biodiversiteit, soortenrijkdom |
| blindness zelfstandig naamwoord | /ˈblaɪndnəs/ | blindheid |
| caterpillar zelfstandig naamwoord | /ˈkætɚˌpɪlɚ/ | rups |
| cicada zelfstandig naamwoord | /sɪˈkeɪ.də/ | cicade |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| point out werkwoord | aanwijzen, aanduiden |
Uitspraak om op te letten
- De “th”-klanken: thrive /θɹajv/, southeast /sawˈθɪjst/
- De klanken “sh” en “zh”: deforestation /dɪˌfɒɹɪsˈteɪʃən/, echolocation /ˌɛkoʊloʊˈkeɪʃən/, infestation /ˌɪnfɛsˈteɪ̯ʃən/, preferentially /ˈpɹɛf.ɜː(ɹ)ˌɛn.ʃə.li/, implication /ˌɪmpləˈkeɪʃən/
- Lange woorden — let op de klemtoon: deforestation /dɪˌfɒɹɪsˈteɪʃən/, insectivorous /ˌɪnsɛkˈtɪv(ə)ɹəs/, ecosystem /ˈikoʊˌsɪstəm/, biodiversity /ˌbaɪoʊdəˈvɚsəti/, caterpillar /ˈkætɚˌpɪlɚ/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: farmland /ˈfɑːɹmlænd/, forage /ˈfoɹɪd͡ʒ/, livelihood /ˈlaɪvlihʊd/, comprise /kəmˈpɹaɪz/, maximize /ˈmæksəmaɪz/
- /æ/ — opener dan de Nederlandse “e”: paddy /ˈpædi/, habitat /ˈhæb.ɪ.tæt/, ancestor /ˈæn.sɛs.tɚ/, caterpillar /ˈkætɚˌpɪlɚ/, farmland /ˈfɑːɹmlænd/
- /g/ — een harde plofklank, geen Nederlandse “g”: plague /plɛɡ/, colleague /ˈkɒliːɡ/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als pest, farmer, insect.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.