Current research has identified five threats to humpback dolphin populations: habitat destruction; pollution; noise; insufficient food sources; and the impact of the fishing industry. But how big a problem is each one of these?
綜合目前學界的研究，威脅白海豚族群的 5 大因子，分別是棲地破壞、環境污染、噪音干擾、食物來源不足和漁業衝擊，但影響程度如何？