隔离是海洋鱼类种族延续的一大威胁
文章来源:未知 文章作者:meng 发布时间:2010-07-07 02:44 字体: [ ]  进入论坛
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At first glance it may seem like a good idea to be a fish living the quiet life on a small and isolated1 reef. But a team of researchers has found that the opposite is the case(情况属实) on Australia's Great Barrier Reef.

Using 15 years of long-term monitoring data collected from 43 reefs by the Australian Institute of Marine2 Science (AIMS), the researchers from AIMS and the University of Adelaide have found that fish living on small, isolated reefs face a greater risk of local extinction3.

The results have been published in Ecology, the journal of the Ecological4 Society of America.

"Our results support the idea that small and isolated reefs are more susceptible(易受……影响的) to local species extinctions because of the tendency for their fish populations to be more variable," says project leader Dr Camille Mellin, a Postdoctoral Fellow from AIMS and the University of Adelaide's Environment Institute.

"Isolated reefs receive relatively5 fewer 'immigrant' fish from adjacent(临近的) reefs. If there is a disturbance6(干扰,骚乱) to the population, such as a cyclone7 or coral bleaching8(漂白,退色) , fish species on isolated reefs are much slower to recover. These populations are not as resilient(有弹力的) to changes and are not easily replenished9(装满,添加) , increasing their probability of extinction."

By contrast, larger, more populated reefs see fewer large fluctuations10(波动,起伏) in the fish population. This is partly due to the increased competition between species, and partly because of predators11, which keep the population size in check(受控制的) .

"Our research suggests that conservation resources might be better allocated12(分配,分派) to the protection of large, connected habitats," Dr Mellin says.

As a result of the research, a map has been produced predicting the patterns of variability of coral reef fish species on the Great Barrier Reef.

"This new map is a potential new tool for the managers of the Great Barrier Reef Marine Park, but it's important to emphasize that it is just one tool. When making management decisions for the Reef, a whole range of issues needs to be taken into account," Dr Mellin says.

Professor Corey Bradshaw, Director of Ecological Modeling at the University of Adelaide, says the research is "an essential piece in the marine planning puzzle". "If data for other reefs around the world become available, it would be possible to assess threats to species in those parts of the world using the same techniques," he says.

"Our research also demonstrates the need for long-term data sets," says Dr Julian Caley, Principal Research Scientist at AIMS. "This work would not have been possible without AIMS' commitment to the long-term monitoring of the Great Barrier Reef. This dataset(资料组) is unique in the world and the only one that would have made this study possible."

The Great Barrier Reef is the world's largest reef system, composed of more than 2900 individual reefs and 900 islands stretching(拉伸) for more than 2600 kilometers (1600 miles).



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1 isolated bqmzTd     
adj.与世隔绝的
参考例句:
  • His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
  • Patients with the disease should be isolated. 这种病的患者应予以隔离。
2 marine 77Izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • 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。
3 extinction sPwzP     
n.熄灭,消亡,消灭,灭绝,绝种
参考例句:
  • The plant is now in danger of extinction.这种植物现在有绝种的危险。
  • The island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。
4 ecological IrRxX     
adj.生态的,生态学的
参考例句:
  • The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • Each animal has its ecological niche.每种动物都有自己的生态位.
5 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • 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。
6 disturbance BsNxk     
n.动乱,骚动;打扰,干扰;(身心)失调
参考例句:
  • He is suffering an emotional disturbance.他的情绪受到了困扰。
  • You can work in here without any disturbance.在这儿你可不受任何干扰地工作。
7 cyclone cy3x7     
n.旋风,龙卷风
参考例句:
  • An exceptionally violent cyclone hit the town last night.昨晚异常猛烈的旋风吹袭了那个小镇。
  • The cyclone brought misery to thousands of people.旋风给成千上万的人带来苦难。
8 bleaching c8f59fe090b4d03ec300145821501bd3     
漂白法,漂白
参考例句:
  • Moderately weathered rock showed more intense bleaching and fissuring in the feldspars. 中等风化岩石则是指长石有更为强烈的变白现象和裂纹现象。
  • Bleaching effects are very strong and show on air photos. 退色效应非常强烈,并且反映在航空象片上。
9 replenished 9f0ecb49d62f04f91bf08c0cab1081e5     
补充( replenish的过去式和过去分词 ); 重新装满
参考例句:
  • She replenished her wardrobe. 她添置了衣服。
  • She has replenished a leather [fur] coat recently. 她最近添置了一件皮袄。
10 fluctuations 5ffd9bfff797526ec241b97cfb872d61     
波动,涨落,起伏( fluctuation的名词复数 )
参考例句:
  • He showed the price fluctuations in a statistical table. 他用统计表显示价格的波动。
  • There were so many unpredictable fluctuations on the Stock Exchange. 股票市场瞬息万变。
11 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
12 allocated 01868918c8cec5bc8773e98ae11a0f54     
adj. 分配的 动词allocate的过去式和过去分词
参考例句:
  • The Ford Foundation allocated millions of dollars for cancer research. 福特基金会拨款数百万美元用于癌症研究。
  • More funds will now be allocated to charitable organizations. 现在会拨更多的资金给慈善组织。
TAG标签: fish reefs isolated
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