根據(jù)一項(xiàng)研究,，一個(gè)改造全世界海洋中的微藻華從而減少大氣二氧化碳濃度的設(shè)計(jì)方案可能讓海洋被神經(jīng)毒素污染。
Charles Trick及其同事報(bào)告說(shuō),，為海洋施加鐵肥——這種策略是為了增加生活在海洋表層水的消耗二氧化碳的生物的數(shù)量——很可能促進(jìn)偽菱形藻的生長(zhǎng)。
偽菱形藻是一個(gè)浮游植物屬,，它們產(chǎn)生導(dǎo)致記憶喪失性貝類中毒的神經(jīng)毒素的一種成分,。如果人吃了以這種藻類為食的魚（如鳳尾魚和沙丁魚），自然產(chǎn)生的這種毒素有可能導(dǎo)致人類健康風(fēng)險(xiǎn),。
這組科學(xué)家檢查了在北太平洋亞寒帶進(jìn)行鐵富集實(shí)驗(yàn)過(guò)程中采集的水樣,，并確定了菱形藻的群落比對(duì)照組增加了一倍，而富鐵環(huán)境可能增加藻類產(chǎn)生的神經(jīng)毒素,，而這種毒素的自然釋放特別促進(jìn)了可能有害的浮游生物的進(jìn)一步生長(zhǎng),，因此也就增加了在鐵施肥的過(guò)程中有毒藻華出現(xiàn)的幾率。這組作者說(shuō),，他們的研究可能影響著眼于鐵施肥和深海碳截存的投資,。（生物谷Bioon.com）
生物谷推薦原文出處：
PNAS doi: 10.1073/pnas.0910579107
Iron enrichment stimulates toxic diatom production in high-nitrate, low-chlorophyll areas
Charles G. Tricka,1, Brian D. Billb,c, William P. Cochlanb, Mark L. Wellsd, Vera L. Trainerc, and Lisa D. Pickelld
Oceanic high-nitrate, low-chlorophyll environments have been highlighted for potential large-scale iron fertilizations to help mitigate global climate change. Controversy surrounds these initiatives, both in the degree of carbon removal and magnitude of ecosystem impacts. Previous open ocean enrichment experiments have shown that iron additions stimulate growth of the toxigenic diatom genus Pseudonitzschia. Most Pseudonitzschia species in coastal waters produce the neurotoxin domoic acid (DA), with their blooms causing detrimental marine ecosystem impacts, but oceanic Pseudonitzschia species are considered nontoxic. Here we demonstrate that the sparse oceanic Pseudonitzschia community at the high-nitrate, low-chlorophyll Ocean Station PAPA (50° N, 145° W) produces approximately 200 pg DA L?1 in response to iron addition, that DA alters phytoplankton community structure to benefit Pseudonitzschia, and that oceanic cell isolates are toxic. Given the negative effects of DA in coastal food webs, these findings raise serious concern over the net benefit and sustainability of large-scale iron fertilizations.
