文章来源:未知 文章作者:meng 发布时间:2010-10-07 01:13 字体: [ ]  进入论坛

A first-of-its-kind study that tracked the oceanic migrations1 of adult Atlantic sturgeon(鲟鱼) that were caught and tagged in the Hudson River discovered that these fish move vast distances in the Atlantic Ocean, traveling as far south as Georgia and as far north as Nova Scotia, Canada. The findings indicate that recovery of Atlantic sturgeon fisheries(渔业,渔场) will need to address long-range oceanic threats to the species in addition to local measures closer to spawning3 grounds(产卵场) . These results are particularly timely given the announcement on October 5 by NOAA's Fisheries Service, proposing that five populations of Atlantic sturgeon along the U.S. East Coast, including the population examined in this study, receive protection under the federal Endangered Species Act (http://www.nefsc.noaa.gov/press_release/2010/News/NR1025/index.html). The researchers used pop-up satellite archival tags (PSAT), which were affixed4 to sturgeon in their freshwater spawning grounds in the Hudson River. This relatively6 new technology enabled researchers to track fish movements over a larger area, and without the bias7(偏见) that can occur with other commonly used methods such as fixed5 acoustic8 arrays or fishery-dependent observations.

"This study of Atlantic sturgeon provides us with new insight into the very critical oceanic phase of the lives of these fish," said Dr. Ellen Pikitch, Executive Director of the Institute for Ocean Conservation Science at Stony9 Brook10 University and co-author of the study. "Effective restoration policies for sturgeon must consider threats to the species throughout their life cycle."

As is the case for most species of sturgeon, Atlantic sturgeon spawn2 in fresh water but spend the majority of their lives in the sea, A status review conducted in 2007 identified five Distinct Population Segments for Atlantic Sturgeon, which are genetically11 and ecologically distinct groups of fish.

"This research demonstrates Atlantic sturgeon from the New York Bight move widely through the near-shore Atlantic Ocean and thus, likely mix with groups of other Atlantic sturgeon along the East Coast of the United States, making the conservation and management of Distinct Population Segments as separate and distinct groups very difficult, if not impossible," said Daniel L. Erickson, Oregon Department of Fish and Wildlife, and primary author of the study, who was a researcher for the Institute and the Wildlife Conservation Study while the study was being conducted. "The results also suggest that PSAT technology can be an effective means for studying Atlantic sturgeon and possibly other sturgeon species, and is particularly helpful for uncovering oceanic behavior and for defining critical habitat."

This method of study was first applied12 to sturgeon by Erickson and Dr. Pikitch to understand the migratory13 behavior of green sturgeon on the West Coast. Results of that study have since been used by NOAA's Fisheries Service to help delineate critical marine14 habitat for these sturgeon, which were recently listed as threatened.

The research revealed three major sturgeon aggregation15 areas of these Atlantic sturgeon, including aggregations16 off the southwest shore of Long Island, the New Jersey17 shore, and off shore of Delaware Bay. A small concentration was also found within Long Island Sound. While most of the tags popped off within the mid-Atlantic Bight, two of the tagged sturgeons traveled much further afield(在战场上,去野外) , with one traveling north to Cobequid Bay off Nova Scotia and the other traveling south to the coast of Georgia.

"Atlantic sturgeon were almost rendered(描绘,渲染) extinct in the late 1800s due to over-fishing, and recent protections enacted18 to save these fish have prevented further declines," said Dr. Pikitch. "If we want Atlantic sturgeon to make a full recovery, we need to understand and address the threats these fish face during their oceanic phase. This study provides the most comprehensive picture of the migratory behavior of sturgeon in the ocean to date."

Atlantic sturgeon are directly harvested in Canadian waters, and although they are currently protected from directed take in U.S. waters, they are subject to by-catch mortality by commercial fisheries. Bycatch mortality of Atlantic sturgeon over a broad swath(细长的列) of ocean may be an important factor impeding19(临近的) their recovery. This week, NOAA's Fisheries Service proposed that five populations of Atlantic sturgeon along the U.S. East Coast receive protection under the federal Endangered Species Act. The Gulf20 of Maine population is proposed for listing as threatened, and endangered status is proposed for the Chesapeake Bay, New York Bight, Carolina, and South Atlantic populations. Species listed as endangered receive the full protection of the Endangered Species Act, including a prohibition21 against "take," defined to include harassing22, harming, pursuing, wounding, killing23, trapping, capturing, or collecting. Similar prohibitions24 usually extend to threatened species.


1 migrations 2d162e07be0cf65cc1054b2128c60258     
n.迁移,移居( migration的名词复数 )
  • It foundered during the turmoils accompanying the Great Migrations. 它在随着民族大迁徙而出现的混乱中崩溃。 来自辞典例句
  • Birds also have built-in timepieces which send them off on fall and spring migrations. 鸟类也有天生的时间感应器指导它们秋春迁移。 来自互联网
2 spawn qFUzL     
  • The fish were madly pushing their way upstream to spawn.鱼群为产卵而疯狂地向上游挤进。
  • These fish will lay spawn in about one month from now.这些鱼大约一个月内会产卵。
3 spawning e223115a66b2213a16c438abb9a400cb     
  • Encounter sites have a small chance of spawning a "Commander" NPC. 遭遇战地区有很小的几率遇到NPC指挥官。
  • Instantly revives your Champion at your Spawning Pool, 9 minute cooldown. 立即在出生地复活你的英雄,冷却时间9分钟。
4 affixed 0732dcfdc852b2620b9edaa452082857     
adj.[医]附着的,附着的v.附加( affix的过去式和过去分词 );粘贴;加以;盖(印章)
  • The label should be firmly affixed to the package. 这张标签应该牢牢地贴在包裹上。
  • He affixed the sign to the wall. 他将标记贴到墙上。 来自《简明英汉词典》
5 fixed JsKzzj     
  • Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗?
  • Once the aim is fixed,we should not change it arbitrarily.目标一旦确定,我们就不应该随意改变。
6 relatively bkqzS3     
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
7 bias 0QByQ     
  • They are accusing the teacher of political bias in his marking.他们在指控那名教师打分数有政治偏见。
  • He had a bias toward the plan.他对这项计划有偏见。
8 acoustic KJ7y8     
  • The hall has a fine acoustic.这个大厅的传音效果很好。
  • Animals use a whole rang of acoustic, visual,and chemical signals in their systems of communication.动物利用各种各样的听觉、视觉和化学信号来进行交流。
9 stony qu1wX     
  • The ground is too dry and stony.这块地太干,而且布满了石头。
  • He listened to her story with a stony expression.他带着冷漠的表情听她讲经历。
10 brook PSIyg     
  • In our room we could hear the murmur of a distant brook.在我们房间能听到远处小溪汩汩的流水声。
  • The brook trickled through the valley.小溪涓涓流过峡谷。
11 genetically Lgixo     
  • All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
  • Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物
12 applied Tz2zXA     
  • She plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
13 migratory jwQyB     
  • Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
  • This does not negate the idea of migratory aptitude.这并没有否定迁移能力这一概念。
14 marine 77Izo     
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
15 aggregation OKUyE     
  • A high polymer is a very large aggregation of units.一个高聚物是许多单元的非常大的组合。
  • Moreover,aggregation influences the outcome of chemical disinfection of viruses.此外,聚集作用还会影响化学消毒的效果。
16 aggregations 4c4f91ef635e1dd162c5cdd100d293aa     
n.聚集( aggregation的名词复数 );集成;集结;聚集体
  • A pattern of overlapping aggregations is usually found. 通常可发现一种叠聚集现象。 来自辞典例句
  • The atoms of the different chemical elements are different aggregations of atoms of the same kind. 不同化学元素的原子是同类原子的不同聚合物。 来自辞典例句
17 jersey Lp5zzo     
  • He wears a cotton jersey when he plays football.他穿运动衫踢足球。
  • They were dressed alike in blue jersey and knickers.他们穿着一致,都是蓝色的运动衫和灯笼短裤。
18 enacted b0a10ad8fca50ba4217bccb35bc0f2a1     
制定(法律),通过(法案)( enact的过去式和过去分词 )
  • legislation enacted by parliament 由议会通过的法律
  • Outside in the little lobby another scene was begin enacted. 外面的小休息室里又是另一番景象。 来自英汉文学 - 嘉莉妹妹
19 impeding 8qtzd2     
  • Fallen rock is impeding the progress of rescue workers. 坠落的石头阻滞了救援人员的救援进程。
  • Is there sufficient room for the kiosk and kiosk traffic without impeding other user traffic? 该环境下是否有足够的空间来摆放信息亭?信息亭是否会妨碍交通或者行走? 来自About Face 3交互设计精髓
20 gulf 1e0xp     
  • The gulf between the two leaders cannot be bridged.两位领导人之间的鸿沟难以跨越。
  • There is a gulf between the two cities.这两座城市间有个海湾。
21 prohibition 7Rqxw     
  • The prohibition against drunken driving will save many lives.禁止酒后开车将会减少许多死亡事故。
  • They voted in favour of the prohibition of smoking in public areas.他们投票赞成禁止在公共场所吸烟。
22 harassing 76b352fbc5bcc1190a82edcc9339a9f2     
v.侵扰,骚扰( harass的现在分词 );不断攻击(敌人)
  • The court ordered him to stop harassing his ex-wife. 法庭命令他不得再骚扰前妻。 来自《简明英汉词典》
  • It was too close to be merely harassing fire. 打得这么近,不能完全是扰乱射击。 来自辞典例句
23 killing kpBziQ     
  • Investors are set to make a killing from the sell-off.投资者准备清仓以便大赚一笔。
  • Last week my brother made a killing on Wall Street.上个周我兄弟在华尔街赚了一大笔。
24 prohibitions 1455fa4be1c0fb658dd8ffdfa6ab493e     
禁令,禁律( prohibition的名词复数 ); 禁酒; 禁例
  • Nowadays NO PARKING is the most ubiquitous of prohibitions. 今天,“NO PARKING”(禁止停车),几乎成了到处可见的禁止用语了。
  • Inappropriate, excessive or capricious administration of aversive stimulation has led to scandals, lawsuits and prohibitions. 不恰当的、过度的或随意滥用厌恶性刺激会引起人们的反感、控告与抵制。