Antarctic blue whales have been perceived again in the sub-Antarctic island of South Georgia. An international-team of researchers discovered the animals five decades after whaling (捕鲸业) nearly caused them to disappear forever. “The ocean resources at South Georgia were heavily developed during the early 20th-century industrial whaling,” says lead author Susannah Calderan, an ecologist with the Scottish Association for Marine Science.
Antarctic blue whales were plentiful in the area until whaling began there in 1904, kicking off the beginning of industrial whaling in the Southern Ocean. While hunters originally focused on species that could be easily caught, like the humpback whale, the focus quickly moved to the blue whale. Between 1904 and 1973, 345,775 Antarctic blue whales were killed in the Southern hemisphere (半球)and in the northern Indian Ocean. Around South Georgia, blue whale catches were reported year-round without stopping. Between 1904 and 1971, industrial whaling caused 42, 698 blue whales’ death, Blue whales almost disappeared in these areas.
Researchers studied all Antarctic blue whale data from the last three decades. They examined sightings (目睹)from scientific surveys collected by observers on ships, as well as opportunistic sightings reported by seamen and ship passengers to the South Georgia. They also examined acoustic(声音的)recordings of blue whale.
They found that whale surveys from ships off South Georgia resulted in just one blue whale sighting between 1998 and 2018. But more recent surveys suggest better news. A survey in February of 2020 found nearly 60 blue whale sightings, and several acoustic detections (探测).A total of 41 blue whales have been recognized through photos from South Georgia between 2011 and 2020.
“Their return is very meaningful, as it was widely thought that blue whales at South Georgia might have been hunted beyond a point where they could recover, and might never be seen again in great numbers at South Georgia,” Calderan says. “Our research shows that, populations can recover even from very low levels if they’re given enough protection.”
【小题1】What does the underlined word “perceived” in paragraph 1 mean?A.Kept. | B.Found. | C.Hunted. | D.Destroyed. |
A.The development of industrial whaling. |
B.The cause of blue whales’ disappearance. |
C.The wide spread of blue whales in the past. |
D.The tricks of catching blue whales easily. |
A.There is an increasing return of blue whales. |
B.Blue whales are in a more dangerous situation. |
C.More and more people like watching blue whales. |
D.South Georgia is a good place to watch blue whales. |
A.The risk of killing whales at higher rates. |
B.The sign of Antarctic blue whales’ return. |
C.The way of protecting Antarctic blue whales. |
D.The effect of the great loss of ocean resources. |
Summer is a great time to hit the beach, but a few East Coast beach goers have recently had their fun in the sun turned into a nightmare. In July alone, there have been at least five known shark attacks at Carolina beaches. Although shark attacks are actually quite rare, these animals still inspire fear in ocean waters.
Skip feeding time.
You don't need to dump shark repellent(驱鲨剂)into the sea when you swim, but it helps to be less attractive as a target. Since sharks tend to attack individuals, swim or surf in groups. Don't wear brightly colored or high-contrast swimwear that is attractive to sharks, and leave the shiny jewelry at home in case of being mistaken for the scales(鳞片)of a fish.
Fight back.
When a shark wants to eat you, you'll know in advance: It will hunch its back, lower its fins, and rush at you in a zigzag pattern. Use your dive knife or anything else you' re packing to discourage it.
A.Don't act like dinner. |
B.Don't go into the water individually. |
C.Also watch your movement in the water. |
D.Nevertheless, the following three aspects could help. |
E.If you have a surfboard or bodyboard, use it as a shield. |
F.If you actually get trapped, avoid irregular movements and splashing. |
G.The time of a day has always been a factor in a possible shark attack on humans. |
Are you afraid of sharks? What about snakes or spiders? Put those fears aside:because in the U.S. you’re far more likely to be killed or injured by a deer skipping across the road.
Deer cause more than 200 humans deaths each year, plus some 29,000 injuries,all because of l.2 million collisions between vehicles and deer.Most incidents occur in the eastern U.S. , where deer prosper without natural predators like wolves and mountain lions.
‘‘That’s the region in the U.S. where deer-vehicle collisions are such a problem,and where it seems like an effective large carnivore reintroduction could make a really big difference.’’ says wildlife biologist Laura Prugh from University of Washington.She thinks it would help to reintroduce predators like mountain lions,also known as cougars,pumas or panthers,to parts of their historic range from which they’ve been driven out.
The researchers say that bringing the predators back to the eastern U.S. would mean 22 percent fewer collisions between cars and deer over three decades.Each year would see five fewer human deaths,680 fewer injuries and a savings of some $50 million.Sophie L. Gilbert thinks there are great socioeconomic benefits of large predator restoration through reduced wildlife-vehicle collisions and she says,“Cougars have shown that they can coexist in short distance with people,with very few conflicts,in a lot of areas out west.”
Still,some folks might be understandably nervous about this kind of plan.After all , reintroducing predators doesn’t come without risks to pets and to livestock,and very occasionally to people.
“Our fear of large predators is so natural and intense that I don’t think it’s possible to just completely clear it with statistics…what I hope is that knowing that there actually can be some measurable benefits might make people a little more supportive and maybe balance that fear a little bit.”says Laura.
Indeed,the statistics show that cougars would prevent five times as many human deaths from deer-related accidents as they would cause by attacks.But it’ll be a tough sell:the press will cover cougar attacks,but a statistically prevented death does not make the news.Nevertheless,“If people in the west can put up with having mountain lions around.I would hope that New Yorkers would be up for the challenge as well.”
【小题1】The underlined word in paragraph 3 is closest in meaning to __________.
A.a meat-eating animal | B.a grass-eating animal |
C.a cat-like animal | D.a dangerous animal |
A.To minimize the accidents caused by deer. |
B.To maintain biodiversity and ecological balance. |
C.To take up the challenge from people in the west. |
D.To reduce people’s fear of this dangerous creature. |
A.Because the risks outweigh the benefits. |
B.Because mountains lions like eating people. |
C.Because mountain lions tend to get too close to people. |
D.Because the benefits are not as eye-catching as its risks. |
A.Puma:a Tough Sell | B.A New Study on Puma |
C.Deer Cause Huge Life Losses | D.Deer or Pumas:a Hard Choice |
Have you always dreamed of having a garden,but thought you didn’t have enough space (空间)?
Plan your layout (布局) carefully.
Make use of vertical (垂直的) space. One of the best ways to make the most of your small garden is to use vertical gardening skills. Vertical gardening is an excellent way to add more greenery to your small garden without taking up too much space.
Include the eatable into your garden. Growing your own food is not only satisfying,but it can also save you money on groceries Even if you only have a small garden. you can still consider growing various fruits,vegetables, which can be grown ta containers like boxes and pots.
With these tips in mind,you can create a beautiful and productive garden in even the smallest space. Happy gardening!
A.Follow design rules. |
B.It’s time to think again. |
C.Choose suitable plants. |
D.First,owning a garden is important. |
E.You can grow plants on walls or ladders. |
F.Before planting. think about how to use your garden. |
G.They can provide fresh and delicious food throughout the season. |
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