日韩色综合-日韩色中色-日韩色在线-日韩色哟哟-国产ts在线视频-国产suv精品一区二区69

手機APP下載

您現在的位置: 首頁 > 在線廣播 > 科學美國人 > 科學美國人地球系列 > 正文

科學美國人60秒:清理布朗克斯河 讓鯡魚回家

來源:可可英語 編輯:aimee ?  可可英語APP下載 |  可可官方微信:ikekenet
 下載MP3到電腦  批量下載MP3和LRC到手機
加載中..
i10=W7yyVrym

urW_zXfE^FLc3jUQ^#;-

This is Scientific American — 60-Second Science. I'm Steve Mirsky.
"So here's the first of the alewives, all silvery, they're all about the same size, you can't tell the boys from the girls. These will be the first."
Stephen Gephard, fisheries biologist with the Connecticut Department of Energy and Environmental Protection.
Gephard brought 400 alewives down from the Nutmeg state to be released into the Bronx River on the grounds of the Bronx Zoo on April 20th. The Bronx River was once so polluted that it was called an open sewer. But it's been cleaned up to the point where it can now once again support these fish, which were common here in the 19th century.
"Alewives are herring, they're kind of like a miniature shad." John Waldman is an aquatic conservation biologist at Queens College, who was on hand for the release.
"They're born in fresh water, they rear for the first year in freshwater then go to sea, spend a few years growing larger and then return to the river they were born in, much like salmon or sturgeon or shad. It's called an anadromous life history. And this river appears to have a small relic run that never really expanded because it was limited by the habitat."

2PE)cMf]loqJylZ#;qK

鯡魚.jpg

XwTsd%q#R%8T%OJf_

"And now there's a fish ladder on the first dam and these fish that are being stocked today, 400 alewives...and the idea here is that if they spawn in this section, the young will kind of imprint on this area, run downstream and then return when they're old to spawn several years from now and want to go over the fish ladder."
"In the meantime, several fish have used the fish ladder on their own this week that were from wild fish that were existing as a little relic stock, I believe, in this section of the river, so between the two I think the future looks very promising to have a much larger run."
"The water here behind the Bronx Zoo is just perfect for alewife spawning, it's very slow moving, it's just what they like. And there's a series of dams above this first dam that are probably going to have fish ladders in the future, too. And if we get them all online working, this little river that flows through the heart of the Bronx could become a major alewife producer, which is kind of fun in its own right, to have such an urban location producing these wild fish, but it also is a great tie to the ocean."
"Alewives and other bait fish really drive the marine food chain, and this is a contribution to our greater coastal waters. So I'm very excited by the prospects of this restoration."
Gephard: "Alright, we gotta get 'em in the water."
For the Scientific American — 60-Second Science Science. I'm Steve Mirsky.

Y@yZ|(Xw2g9(q;

2&QA-RX&4+-(2)l_,)

2L7,U1phP#saSa7WgJY(VmIvDnpbRPk6QMUx6H~*X^Gt=N!gsnU

重點單詞   查看全部解釋    
relic ['relik]

想一想再看

n. 神圣的遺物,遺跡,紀念物

 
habitat ['hæbitæt]

想一想再看

n. (動植物的)產地,棲息地

聯想記憶
pressure ['preʃə]

想一想再看

n. 壓力,壓強,壓迫
v. 施壓

聯想記憶
urban ['ə:bən]

想一想再看

adj. 城市的,都市的

聯想記憶
protection [prə'tekʃən]

想一想再看

n. 保護,防衛

聯想記憶
sewer ['səuə,'sjuə]

想一想再看

n. 下水道,陰溝,裁縫師

聯想記憶
bait [beit]

想一想再看

n. 餌,引誘
vt. 嘲笑,縱犬攻擊,以餌引

聯想記憶
contribution [.kɔntri'bju:ʃən]

想一想再看

n. 貢獻,捐款(贈)

 
imprint ['imprint,im'print]

想一想再看

vt. 刻上記號(加特征,印刷,蓋印,壓印,銘記)

聯想記憶
stock [stɔk]

想一想再看

n. 存貨,儲備; 樹干; 血統; 股份; 家畜

 
?
發布評論我來說2句

    最新文章

    可可英語官方微信(微信號:ikekenet)

    每天向大家推送短小精悍的英語學習資料.

    添加方式1.掃描上方可可官方微信二維碼。
    添加方式2.搜索微信號ikekenet添加即可。
    主站蜘蛛池模板: av电影在线| 接吻戏| 少年歌行电视剧演员表| 道东道西| 结婚请帖怎么写| 命运的逆转| 张志忠演员| 黄大年主要事迹概括| 男同操视频| 穿上触手内衣被调教堕落| 小绵羊男星是谁| 保镖电影大全免费| 村上信五| 王若涵| 甜蜜杀机 电影| 正在直播乒乓赛事| 韩国电影诱惑| 杨东波| 石隽| 让我们的家更美好教学设计| 刘沙| 卧虎演员表| 坏老师| 拔萝卜视频免费播放| 原神黄色漫画| 陕西卫视节目表| 西海情歌原歌词全文| 潘雨辰主演的电视剧大全| 艋舺| 狂野鸳鸯| 赵在允| 三年片观看免费完整版中文版| 猫小帅睡前故事| 美女下面流水| 肉丸3| 澳大利亚《囚犯》| 郑艳丽曹查理主演的影片| 音乐会电视剧免费观看完整版 | 小绵羊男星是谁| 条件概率经典例题| 你在想什么|