早前各地均收到中國寄送的不明種子包裹,招來各地區政府的警覺,不斷提醒市民千萬不要種植不明來歷的植物,以免釀成生態災難。465Please respect copyright.PENANAYBYfuxvIUt
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外來品種對本土生態所造成的傷害是可以非常巨大的。事實上,美國、加拿大及各歐洲地區現正亦面對著一場生態災難的風波。465Please respect copyright.PENANAGkZqs1lvom
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早在2002年,美國密歇根州首度發現名為Emerald Ash Borer的甲蟲(光臘瘦吉丁蟲, EAB)品種出現,相信是從亞洲經由黏附在貨物的方式抵達美國,其後亦陸續在加拿大及歐洲地區發現。465Please respect copyright.PENANArw01L1j7xK
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EAB及其幼蟲主要以侵蝕梣樹(Ash tree)為生,至今摧毀了美洲數以億計的梣樹。465Please respect copyright.PENANAjSwAJ7JGsH
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梣樹是製造傢俬、棒球棍及結他的材料,同時亦是各鳥類及昆蟲的住所。465Please respect copyright.PENANAaLRmYJ2KSM
而基於梣樹的樹木亦會用作柴火燃燒之用,人為物流同時間亦加速了EAB在各地區的散播。465Please respect copyright.PENANAVciNVld76o
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(圖2)然而,亞洲地區尤其是中國因為擁有龐大數量的EAB捕食者,所以樹木被受侵蝕的情況並不算是嚴重。465Please respect copyright.PENANAxZSZT915KU
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正因如此,美國及加拿大相繼引入中國4種不同品種的黃蜂(Ref1),藉此希望抑制EAB在大自然間的數量。465Please respect copyright.PENANAuR5B3UNpJS
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2009年至2014年間,美國分別在300個受侵地區釋放數十萬隻雌性黃蜂(及一定比例的男性),並錄得EAB幼蟲90%的下跌。465Please respect copyright.PENANAr02rNBBGdR
結果雖有成效,但這始終是一種引入外來物種對抗外來物種的做法,難保會否構成另一種生態災難,報告(Ref1)指出將會密切觀察引入中國黃蜂物種所帶來的效果。465Please respect copyright.PENANAgtX2SGx7wJ
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(圖3)同時間,科學家發現中國地區的樹木品種相對上較為有效抵抗EAB的侵襲。465Please respect copyright.PENANAEhWO25IzuW
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基於這點,科學家分析各地區的樹木基因(Ref2),推斷至少有53種基因促使中國樹木較為有效抵抗EAB侵襲。465Please respect copyright.PENANA89kP4M6kt5
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當中其中一種有著顯著分別的基因主要負責製造木質素(Lignin),而各文獻亦有證據指出木質素(Lignin)有著保護樹木內層及釋放物質吸引EAB捕食者前來的效果。465Please respect copyright.PENANA9kES3QGif1
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現時美國雖然已用上引入捕食者及殺蟲劑的做法抑壓EAB的數量增長,但樹木侵蝕的現象並未有完全地根治及解決。465Please respect copyright.PENANA7YjSLxClB7
長遠來說,利用基因改造技術把相關的基因編輯在美國本土的樹木,或許才能徹底根治問題。465Please respect copyright.PENANA8UbeWVMzms
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總而言之,外來物種的入侵,將會對當地的生態及經濟構成相當大的負擔,任何市民均有責任及義務杜絕此等事情發生。465Please respect copyright.PENANAFdTneUWFau
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Ref1:https://www.srs.fs.usda.gov/pubs/49122465Please respect copyright.PENANAm8XUJ0Zzrb
Ref2:https://www.nature.com/articles/s41559-020-1209-3465Please respect copyright.PENANAbJ1hMgDhc2