美國(guó)科學(xué)家發(fā)現(xiàn)舊金山河口的污染物質(zhì)持續(xù)影響著條紋鱸魚(yú)幼魚(yú)發(fā)育,，之前曾發(fā)現(xiàn)這種魚(yú)甚至在適合生存的環(huán)境中也會(huì)出現(xiàn)種群數(shù)量嚴(yán)重下降,，最新發(fā)現(xiàn)可能能幫助尋找方法來(lái)應(yīng)對(duì)其種群數(shù)量下降,。相關(guān)研究論文發(fā)表在美國(guó)《國(guó)家科學(xué)院院刊》（PNAS）上,。
加州大學(xué)David Ostrach及其同事強(qiáng)調(diào),，舊金山河口的諸如PCBs,、DDT以及其他外源化學(xué)物質(zhì)等人造污染物導(dǎo)致條紋鱸魚(yú)幼魚(yú)發(fā)育產(chǎn)生變化,。
舊金山在1935年以前一直支持條紋鱸魚(yú)的商業(yè)捕撈,，之后該市的官員規(guī)定除非是釣魚(yú)運(yùn)動(dòng),，否則不能捕捉這種魚(yú)。在之后的40年中,，這種魚(yú)繁衍的很好,。但是從20世紀(jì)70年代開(kāi)始一直到今天，這種魚(yú)的種群數(shù)量因?yàn)楣I(yè),、農(nóng)業(yè)和城市污染的原因而大幅度下降,。
研究人員發(fā)現(xiàn)所有在河里捕捉到的魚(yú)體內(nèi)都含有生物顯著水平的污染物。分析表明野生條紋鱸魚(yú)幼魚(yú)比對(duì)照組的幼魚(yú)更瘦也更小,。進(jìn)一步的研究表明在河里捕捉到的幼魚(yú)的大腦更小,、肝臟發(fā)育反常,，而且和對(duì)照組相比糖原耗盡，這意味著野生幼魚(yú)用于尋找食物和躲避捕食者的能量更少,。研究人員報(bào)告說(shuō),，河口的雌魚(yú)攝取并傳給魚(yú)卵的化合物可能是造成對(duì)幼魚(yú)不利影響的原因。（生物谷Bioon.com）
生物谷推薦原始出處：
PNAS,，doi:10.1073/pnas.0802616105,，David J. Ostrach，Joe G. Zinkl
Maternal transfer of xenobiotics and effects on larval striped bass in the San Francisco Estuary
David J. Ostracha,b,1, Janine M. Low-Marchellic, Kai J. Edera, Shaleah J. Whitemanb, and Joe G. Zinklb
aJohn Muir Institute of the Environment, Center for Watershed Sciences, and
bDepartment of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, One Shields Avenue, Davis, CA 95616; and
cDepartment of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093
Edited by Dixon Landers, U.S. Environmental Protection Agency, Corvallis, OR, and accepted by the Editorial Board October 3, 2008 (received for review March 14, 2008)
Abstract
Aquatic ecosystems around the world face serious threats from anthropogenic contaminants. Results from 8 years of field and laboratory investigations indicate that sublethal contaminant exposure is occurring in the early life stages of striped bass in the San Francisco Estuary, a population in continual decline since its initial collapse during the 1970s. Biologically significant levels of polychlorinated biphenyls, polybrominated diphenyl ethers, and current-use/legacy pesticides were found in all egg samples from river-collected fish. Developmental changes previously unseen with standard methods were detected with a technique using the principles of unbiased stereology. Abnormal yolk utilization, brain and liver development, and overall growth were observed in larvae from river-collected fish. Histopathological analyses confirmed and identified developmental alterations. Using this methodology enabled us to present a conclusive line of evidence for the maternal transfer of xenobiotics and their adverse effects on larval striped bass in this estuary.
