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        白海豚故事并非孤案 保護海洋生物多樣性需多方發力

        2019年06月10日 04:35 來源:科技日報 參與互動 

          本報記者 陳 瑜

          剛剛過去的小長假,不少人選擇了親海旅游。遺憾的是,近幾年,人們有時在近海可以清楚地看到海水出現綠潮甚至白潮現象。

          “目前人們并不掌握地球上海洋生物物種的精準數字,但不可否認的是,因為生物多樣性下降導致的生態災害正在加劇。”6月8日是第十一個世界海洋日,談及世界海洋日“珍惜海洋資源 保護海洋生物多樣性”主題,中科院海洋所李新正研究員說:“很正常,也很及時,確實需要引起全社會的廣泛關注。”

          海洋生物多樣性受到威脅

          白海豚屬于鯨類的海豚科,與大熊貓、華南虎屬同級別的珍稀瀕危物種。

          “目前正在開展的白海豚全國普查,將進一步摸清不同種群的數量。”但自然資源部第三海洋研究所(以下簡稱海洋三所)王先艷博士估計,即使在種群最多的珠江口海域,白海豚的數量也僅為2500頭左右。

          白海豚的故事并非孤案。

          “按照1988年的國家野生動物保護名錄,2006年評估結果中有400多種瀕危動物,如今這一數字已有明顯增加。”山東大學(威海)海洋學院副教授王亞民告訴記者,目前國家一級保護的海洋動物包括儒艮、中華白海豚、中華鱘、紅珊瑚和黃島長吻蟲五種,其中儒艮和黃島長吻蟲幾乎絕跡,故真正有保護價值的國家一級保護物種僅剩下三種。此外,我國珊瑚礁被破壞率高達80%。

          人類活動是最主要因素

          “人類活動、氣候變化,是影響海洋生物多樣性的兩大原因。”李新正分析,近海的開發區建設、海洋工程、過度捕撈等人類活動,導致海洋生態變化,引發海洋生物資源衰退等問題。

          被列入國家一級保護動物的半索動物多鰓孔舌形蟲和黃島長吻蟲主要分布在膠州灣及其附近海域。根據過去的調查資料,這兩個物種在上世紀80年代以前尚能較易采到。但近20多年已很難見到。

          “去年我們十幾個人花了大半天時間在原來有記錄的棲息地找了一圈,才找到一只黃島長吻蟲。”李新正總結,那些只生活在某個特殊環境、恰巧該區域經濟又特別發達的海洋生物物種的數量縮減最快。

          王亞民特別提到捕撈對海洋生物多樣性的影響。

          我國是捕撈大國,漁船為世界之最,捕撈量比其他國家明顯超出一個數量級。由于捕撈強度太大,我國漁業資源正在衰退,許多魚類的體長、體重都在減少,處于高危險的境地。

          要給予基礎性研究更多關注

          王亞民告訴記者,目前我國與國際合作,采取了許多措施,包括制定國家保護動物名錄、制定休漁與減船制度、建立各種保護區和保護站、制止非法貿易、救助和人工孵化等,發起了中華鱘保護行動、長江江豚保護行動、海龜保護國家行動計劃等,同時成立了許多聯盟以保護海洋哺乳動物、鯨豚類等。

          保護區被認為是對處于瀕危狀態的海洋生物的最好保護。

          但在李新正看來,要落實還是很難。“由于海上的特殊環境,比如珊瑚礁保護區,要運行維護很有難度。再比如,有些沿海經濟發達地區發展空間受限,設立保護區與向海要地發生了沖突。”

          “我們應該首先進行全面的物種多樣性調查,摸清家底,掌握我國海洋生物的資源狀況,這是最基礎性的工作。但目前以分子生物學為主要研究方法的遺傳多樣性研究更容易得到支持。”李新正告訴記者,新中國成立以來,我國開展過兩次大的海洋調查和無數次地區性海洋生物調查,迄今已記錄的我國海域的海洋生物有近三萬種,但實際的海洋生物物種數量和資源狀況遠沒有調查清楚。他呼吁,未來能對海洋物種多樣性這一基礎性研究給予更多傾斜關注。

          (科技日報北京6月9日電)

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