Rock lobsters prey on sea urchins, and increased rock lobster densities coincided with significant decreases in urchins.
岩石龙虾以海胆为食，而岩石龙虾密度的增加正好与海胆数量的显著减少相吻合。
Paris street urchins used to shoot fancy people with rocks as they rode their carriages through the muddy streets of Paris.
巴黎的顽童们过去经常用他们的弹弓“袭击”那些驾着马车穿过巴黎泥泞街道的人们。
The bright red color of a fire urchin warns predators that its spines are poisonous. Sea otters are the major predators of sea urchins.
火海胆鲜红的颜色警告捕食者它的刺有毒。海獭是海胆的主要捕食者。
Fewer otters would have allowed sea urchin populations on which the otters preyed to expand and the urchins' grazing pressure on kelp forests to increase.
海獭的减少会使海胆的数量增加，因为海獭以此为食，从而增加海胆对海藻林的食草压力。
Since the disappearance of sea urchins from the waters up the coast of South Florida, many coral reefs there have been smothered by the uncontrolled growth of algae.
自从海胆从南佛罗里达海岸的海水中消失后，那里有许多珊瑚礁被不受控制生长的藻类所扼杀。
He dives for urchins and traps lobster.
他潜水来捕捉海胆和龙虾。
There are some 700 species of sea urchins worldwide.
全世界有700多种海胆。
Fish pick at the urchins, which feed on bits of algae.
鱼类吃海胆，海胆以小块的藻类为食。
Sea urchins brandish their spines on the seafloor near the Channel Islands.
海胆在海峡群岛附近的海底挥舞着它们的棘突。
Sea a urchins brandish their spines on the seafloor near the Channel Islands.
海胆在海峡群岛附近的海底挥舞着它们的棘突。 。
Without sea otters keeping sea urchins in check, their population has exploded.
没了海獭约束海胆，海胆的数量变得庞大起来。
For instance, it appears the ancestor of brainless starfish and sea urchins had a brain.
例如，无脑海星和海胆的祖先似乎曾有大脑。
No corals, no sea urchins and no who-knows-what-else would be bad news indeed for the sea.
海绵、海胆以及其他那些为人所知的生物的消失对海洋来说可不是好消息。
Sea urchins, like their close relatives the sea stars (starfish), don't technically have eyes.
海胆如它们的近亲海星一样，并没有真正的眼睛。
Echinoid: an echinoderm of the class echinoidea which includes the sand dollars and sea urchins.
海胆：一种属于海胆纲的棘皮动物，包括沙钱和海胆。
Bottom-dwelling creatures like mussels, brittle stars and sea urchins have not developed any defenses.
类似贻贝、海蛇尾和海胆这样生活在海底的生物尚未演化出任何防御能力。
But when the creatures were presented with the larger disks, some urchins fled while others moved closer.
但是，当向这些生物提供更大的磁盘时，一些海胆会逃走，而其它一些则会向磁盘移近。
Popularlyknown as starfish, sea stars are actually echinoderms, closely relatedto sea urchins and sand dollars.
海星实际上是棘皮动物，和海胆和饼海胆是近亲。
Later experiments with other species could reveal the role spine density plays in how well urchins can see.
今后通过对其他物种的实验，才能揭示这些棘的密度是如何发挥作用使海胆能够“看”到东西的。
The biggest losers included clams and pencil urchins; their exoskeletons dissolved at the highest CO2 levels.
最大的败者是蛤和铅笔海胆，它们的外骨骼在二氧化碳水平高的环境中溶解了。
Port Jackson sharks can grow up to 1.6 meters long (5.5 ft) and typically feed on crustaceans, sea urchins, and fish.
来自PortJackson的鲨鱼最大可以长到1.6米长(5.5英尺)，通常以甲壳类动物，海胆和鱼为食。
One reason is their diet: they eat only starfish (and sometimes sea urchins), and they reportedly prefer to eat them alive.
原因之一是它们的饮食：它们只能吃到海星(有时是海胆)，据报道它们喜欢吃活的。
On the sea bed at depths of up to 3,000ft are vast coral reefs, forests of willowy feather-stars and russet-red sea urchins.
在深达近千米的海底，生长着大片绮丽的珊瑚礁、婀娜多姿的海星和黄褐色的海胆。
Though they are commonly called starfish, these animals are not fish at all. They are echinoderms, closely related to sea urchins.
虽然它们通常被称为海星，这些动物不是鱼，它们是棘皮动物，与海胆密切相关。
Reaching 5 feet (1.5 meters) long, wolffish have conspicuous dentition suited to a diet of hard-shelled mollusks, crabs, and sea urchins.
体长最多可达5英尺(1.5米)的狼鱼有着明显的齿系以适应由裹着硬壳的软体动物，蟹类以及海胆组成的食谱。
Sea Urchins Animals of all shapes and sizes have made the trip into space including a group of particularly adventurous sea urchins.
海胆 不同形状和大小的动物被送入了太空，包括一种特别富有冒险精神的海胆。
Urchins feed on algae and invertebrates-a recent study found that the sound of their teeth scraping on reefs can cause a rise in ocean noise.
海胆以海藻和无脊椎动物为食——一项近期的研究发现它们牙齿磨礁石发出的声音会增加海洋的噪音。
Feeds during the day, primarily on mollusks, but also takes fishes, as well as other invertebrates such as brittle stars and sea urchins.
白天进食，主要是软体动物，而且还吃鱼类，以及其他无脊椎动物，如海蛇尾和海胆。
Seafood includes bony and cartilaginous fishes, crustaceans, mollusks, edible jellyfish, sea turtles, frogs, sea urchins, and sea cucumbers.
海味包括多刺和软骨的鱼、甲壳动物、软件动物、可食用的水母、海龟、蛙、球海胆和海参。
Seafood includes bony and cartilaginous fishes, crustaceans, mollusks, edible jellyfish, sea turtles, frogs, sea urchins, and sea cucumbers.
海味包括多刺和软骨的鱼、甲壳动物、软件动物、可食用的水母、海龟、蛙、球海胆和海参。
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