科學(xué)60秒:牡蠣味鮮美 環(huán)保價更高
來源：滬江聽寫酷
2011-07-09 10:00
The Chesapeake Bay could get helped by a new antipollution expert: farmed oysters. For decades, the Chesapeake has been ___1___ by excess nutrients, such as nitrogen, from agricultural and municipal run-off. The nutrients feed algal blooms, which ___2___ the oxygen in the water. And those oxygen-poor waters no longer support the Bay’s rich biodiversity.
The Chesapeake used to be home to wild oysters, but 99 percent of them are gone. The tasty bivalves are known for removing excess phytoplankton from water and ___3___ nutrients in their shells and flesh. So scientists from Virginia Commonwealth University measured the nutrient-chomping potential of the Eastern oyster Crassostrea virginica.
They tested dried tissue and shells from oysters in two aqua-culture sites. Turns out that if a farmed oyster grows to 76 millimeters, it’s a pretty effective ___4___. Eight large-scale oyster farms could clean a ton of nitrogen from the Chesapeake. The study was published in the Journal of Environmental Quality. [Colleen Higgins, Kurt Stephenson and Bonnie Brown, Nutrient Bioassimilation Capacity of Aquacultured Oysters: Quantification of an Ecosystem Service]
Such farming won’t make the bay ___5___ again, but the researchers say the oysters are effective at cleaning the area where they’re grown. And so for a biologically better Chesapeake, pass the hot sauce.
【視聽版科學(xué)小組榮譽出品】
The Chesapeake used to be home to wild oysters, but 99 percent of them are gone. The tasty bivalves are known for removing excess phytoplankton from water and ___3___ nutrients in their shells and flesh. So scientists from Virginia Commonwealth University measured the nutrient-chomping potential of the Eastern oyster Crassostrea virginica.
They tested dried tissue and shells from oysters in two aqua-culture sites. Turns out that if a farmed oyster grows to 76 millimeters, it’s a pretty effective ___4___. Eight large-scale oyster farms could clean a ton of nitrogen from the Chesapeake. The study was published in the Journal of Environmental Quality. [Colleen Higgins, Kurt Stephenson and Bonnie Brown, Nutrient Bioassimilation Capacity of Aquacultured Oysters: Quantification of an Ecosystem Service]
Such farming won’t make the bay ___5___ again, but the researchers say the oysters are effective at cleaning the area where they’re grown. And so for a biologically better Chesapeake, pass the hot sauce.
【視聽版科學(xué)小組榮譽出品】
plagued
suck up
sequestering
water filter
pristine
切薩皮克灣救星降臨：新防污能手——養(yǎng)殖牡蠣。幾十年來，氮肥等隨農(nóng)業(yè)和城市徑流注入切薩皮克灣，致使其水質(zhì)富營養(yǎng)化，進而使得海灣中藻類瘋長，水中的氧氣吸收殆盡，從而導(dǎo)致海灣生物多樣性遭到破壞。
切薩皮克灣曾是野生牡蠣的聚居地，但如今99%的牡蠣已經(jīng)另覓居所。鮮美的牡蠣能夠?qū)傞L的浮游植物“驅(qū)逐”出水域，并將水中過多的養(yǎng)分“收押”到自己體內(nèi)。弗吉尼亞州立邦聯(lián)大學(xué)的科學(xué)家們對東岸牡蠣吸收水中養(yǎng)分的能力進行了測試。
科學(xué)家們對兩個水產(chǎn)養(yǎng)殖地的牡蠣的干燥組織及牡蠣殼進行了測試。結(jié)果發(fā)現(xiàn)，養(yǎng)殖牡蠣長到76毫米長時就是一個絕佳的水質(zhì)凈化器。8個大型牡蠣養(yǎng)殖場養(yǎng)殖的牡蠣能夠幫助處理切薩皮克灣中一噸的氮肥。這項研究報告發(fā)表在《環(huán)境質(zhì)量雜志》上。
牡蠣養(yǎng)殖雖無法幫助切薩皮克灣完全恢復(fù)原貌，但科學(xué)家們表示牡蠣能夠幫助凈化當(dāng)?shù)厮|(zhì)。所以，為了切薩皮克灣能擁有一個良好的生態(tài)環(huán)境，上辣醬——吃牡蠣~
