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Plants can pull carbon dioxide, the planet warming greenhouse gas, out of earth's atmosphere. But these aren't the only living organisms that affect carbon dioxide levels and thus global warming. Nope, I'm not talking about humans. Humble1 sea otters3 can also reduce greenhouse gases, but indirectly4 helping5 Kelp plants. That finding is in the Journal Frontiers in Ecology and the Environment. Researchers used 40 years of data to look at the effect of sea otter2 populations on Kelp. Depending on the plant density6, one square meter of Kelp forest can absorb anywhere from tens to hundreds of grams of carbon per year. But when sea otters are around, kelp density is high and plants can suck more than twelve times as much carbon. That's because otters nosh on kelp-eating sea urchins7. In the mammal's presence, the urchins hide away and feed on kelp detritus8 rather than living carbon absorbing plants. So climate researchers need to note that the herbivores plants and predators9 that eat them also have roles to play in the carbon cycle.
1 humble | |
adj.谦卑的,恭顺的;地位低下的;v.降低,贬低 | |
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2 otter | |
n.水獭 | |
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3 otters | |
n.(水)獭( otter的名词复数 );獭皮 | |
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4 indirectly | |
adv.间接地,不直接了当地 | |
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5 helping | |
n.食物的一份&adj.帮助人的,辅助的 | |
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6 density | |
n.密集,密度,浓度 | |
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7 urchins | |
n.顽童( urchin的名词复数 );淘气鬼;猬;海胆 | |
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8 detritus | |
n.碎石 | |
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9 predators | |
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) | |
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