鱼类尿液能促进珊瑚礁生长
文章来源:未知 文章作者:enread 发布时间:2016-08-17 08:15 字体: [ ]  进入论坛
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Coral reefs wouldn't be the same without their beautiful fish. A diversity of colorful, beautifully patterned species lives in tandem1 with coral reefs around the world, having adapted their appearance, body structure and lifestyle to take refuge in the folds of spiny2, spongy, slippery reefs.
 
Recent studies suggest that coral reefs, however, are just as dependent on these fish for key nutrients3 that help coral grow. When fish urinate, they release phosphorus into the water. This phosphorus, along with nitrogen excreted as ammonium through the gills of fish, is crucial to the survival and growth of coral reefs.
 
A new study appearing Aug. 16 in Nature Communications takes this a step further, finding that in coral reefs where fishing occurs, nearly half of these key nutrients are absent from the ecosystem4.
 
The main reason? Fewer large-bodied and predator5 fish to pee nutrients into the water, the study found.
 
"Part of the reason coral reefs work is because animals play a big role in moving nutrients around," said lead author Jacob Allgeier, a postdoctoral researcher at the University of Washington's School of Aquatic6 and Fishery Sciences.
 
"Fish hold a large proportion, if not most of the nutrients in a coral reef in their tissue, and they're also in charge of recycling them. If you take the big fish out, you're removing all of those nutrients from the ecosystem."
 
Paper co-authors Abel Valdivia at the Center for Biological Diversity in San Francisco and Courtney Cox at Smithsonian Marine7 Station at Fort Pierce, Florida, surveyed 143 fish species at 110 sites across 43 Caribbean coral reefs that varied8 in the amount of fishing pressure sustained -- ranging from marine preserves that banned all fishing to heavily fished reefs where large predator fish are almost gone.
 
The researchers found that reefs with more large, predator fish had healthy levels of nutrients, while reefs depleted9 of large fish had nearly 50 percent fewer nutrients, including phosphorous and nitrogen, essential to their survival.
 
"This study is useful to understand alternative ways fishing is affecting coral reef ecosystems," Allgeier said.


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1 tandem 6Ibzp     
n.同时发生;配合;adv.一个跟着一个地;纵排地;adj.(两匹马)前后纵列的
参考例句:
  • Malcolm's contract will run in tandem with his existing one.马尔科姆的合同将与他手头的合同同时生效。
  • He is working in tandem with officials of the Serious Fraud Office.他正配合欺诈重案办公室的官员工作。
2 spiny 3F9zU     
adj.多刺的,刺状的;n.多刺的东西
参考例句:
  • This is the Asiatic ornamental shrub with spiny branches and pink blossoms.这就是亚洲的一种观赏灌木,具有多刺的枝和粉红色的花。
  • Stay away from a spiny cactus.远离多刺仙人掌。
3 nutrients 6a1e1ed248a3ac49744c39cc962fb607     
n.(食品或化学品)营养物,营养品( nutrient的名词复数 )
参考例句:
  • a lack of essential nutrients 基本营养的缺乏
  • Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
4 ecosystem Wq4xz     
n.生态系统
参考例句:
  • This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
  • We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
5 predator 11vza     
n.捕食其它动物的动物;捕食者
参考例句:
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
6 aquatic mvXzk     
adj.水生的,水栖的
参考例句:
  • Aquatic sports include swimming and rowing.水上运动包括游泳和划船。
  • We visited an aquatic city in Italy.我们在意大利访问过一个水上城市。
7 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。
8 varied giIw9     
adj.多样的,多变化的
参考例句:
  • The forms of art are many and varied.艺术的形式是多种多样的。
  • The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。
9 depleted 31d93165da679292f22e5e2e5aa49a03     
adj. 枯竭的, 废弃的 动词deplete的过去式和过去分词
参考例句:
  • Food supplies were severely depleted. 食物供应已严重不足。
  • Both teams were severely depleted by injuries. 两个队都因队员受伤而实力大减。
TAG标签: nutrients fish coral
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