最早的有性繁殖生物是自由漂浮的浮游生物。
The first organisms that reproduced sexually were free-floating plankton.
海洋中浮游植物的数量在变化。
浮游植物是生长在海里的微小植物。
Phytoplankton are microscopic plants that grow in the ocean.
但浮游植物易受海洋变暖趋势的影响。
But phytoplankton are vulnerable to the ocean's warming trend.
浮游植物很容易受到海洋变暖趋势的影响。
有些地区虽然富含氮化合物，但浮游生物却很少。
Some areas, though rich in these nitrogen compounds, have few plankton.
然而，浮游植物只在铁含量足够高的地表水中繁殖。
However, phytoplankton flourish only in surface waters where iron levels are sufficiently high.
这种现象的核心是被称为浮游植物的微小海洋微生物。
At the heart of the phenomenon lie tiny marine microorganisms called phytoplankton.
根据浮游植物的种类和浓度，海洋颜色有从绿色到蓝色不等。
Ocean colour varies from green to blue, depending on the type and concentration of phytoplankton.
海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。
This change in plankton found in marine deposits is what marks the boundary between the Cretaceous and the Tertiary.
这些营养物质会对海星产生影响，因为它们会增加浮游植物的生长。
These nutrients have an effect on the starfish, because they cause an increase in the growth of phytoplankton.
海马常用尾巴将自己固定在水草或珊瑚枝上，以过往的浮游动物为食。
Anchoring themselves to blades of grass or fingers of coral with their tails, seahorses spend their time feeding on zooplankton.
这本书有许多海洋动物的彩色照片，从浮游生物到小丑鱼乃至逆戟鲸。
This book has large color photographs of sea animals, from plankton to clownfish to orcas.
科学家利用海洋颜色的变化来估计叶绿素含量以及海洋浮游植物的生物量。
Scientists use these changes in ocean color to estimate chlorophyll concentration and the biomass of phytoplankton in the ocean.
这些地区的铁含量特别低，海洋学家推测，铁的缺乏阻碍了浮游生物的繁殖。
These areas have particularly low concentrations of iron, and oceanographers hypothesize that this shortage of iron prevents plankton from thriving.
但在某些水域，如北极水域，气候变暖将使浮游植物的生存条件变得更加恶劣。
But in some waters, such as those of the Arctic, a warming will make conditions worse for phytoplankton.
然而，尽管当地铁浓度立即提高，在一个这样的区域实验释放铁化合物却没有产生大量的浮游生物。
However, an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately.
气态星球上可能存在巨型浮游生物。它们像小型飞船那样漂在厚厚的大气中，靠“吃”闪电获取能量为生。
There may be giant plankton on gaseous planets. They float in a thick atmosphere like small spaceships and live by "eating" lightning.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
气候变暖改变了海洋的主要特征，并会影响浮游植物的生长，因为它们不仅需要阳光和二氧化碳才能生长，而且还需要营养。
Warming changes key characteristics of the ocean and can affect phytoplankton growth, since they need not only sunlight and carbon dioxide to grow, but also nutrients.
气候变化将加速某些地区浮游植物的生长，同时减少其他地区的浮游植物，导致海洋的外观发生变化。
Climate change will fuel the growth of phytoplankton in some areas, while reducing it in other spots, leading to changes in the ocean's appearance.
浮游生物通常在海洋表面附近某些含氮化合物浓度足够高的区域大量繁殖，而海洋表面正是浮游生物生存的地方。
Plankton generally thrive in areas of the ocean with sufficient concentrations of certain nitrogen compounds near the surface, where plankton live.
年幼的刺冠海星在出生后的第一个月就以浮游植物为食，所以海洋中肥料越多，浮游植物就越多，也意味着海星越多，这对珊瑚礁非常不利。
Larval CoT starfish eat phytoplankton in their first month of life, so more fertilizer in the ocean means more phytoplankton, which means more starfish, bad for the reefs.
当浮游植物死后沉到海底，细菌开始将其分解。
When the plants die, they sink to the ocean floor where bacteria begin to break them down.
浮游植物通过光合作用消耗空气中的二氧化碳产生氧气。
Photosynthesis by phytoplankton removes carbon dioxide from the air and produces oxygen.
浮游植物的成长取决于二氧化碳，阳光以及养分的多寡。
Phytoplankton growth depends on the availability of carbon dioxide, sunlight, and nutrients.
我想在清凉的水里浮游，忘记纽约蒸笼里的热浪。
I want to float in cool waters and forget about the heat wave in steaming New York City.
应用推荐