tailieunhanh - Coastal Pollution: Effects on Living Resources and Humans - Chapter 10

Ảnh hưởng của ô nhiễm ven biển từ Hoa lợi Tài nguyên Cá và Động vật có vỏ Cá thu di cư ở vùng nước ven biển của Tây Bắc Đại Tây Dương Rachael Carson, Trong cuốn sách đầu tiên của cô Theo Gió biển được xuất bản vào năm 1941, đã viết trong mục đích Hầu như thơ mộng vẫn Về mặt kỹ thuật hoàn hảo về ngôn ngữ di cư mùa xuân hàng năm của Đại Tây Dương Scomber scombrus cá thu vào các vùng nước ven biển của Trung Hoa Đại Tây Dương, và mô tả sâu sắc. | 10 Effects of Coastal Pollution on Yields from Fish and Shellfish Resources Mackerel Migrations in Coastal Waters of the Western North Atlantic Rachael Carson in her first book Under the Sea Wind published in 1941 wrote in almost poetic but still technically impeccable language about the annual spring migrations of Atlantic mackerel Scomber scombrus into the coastal waters of the Middle Atlantic States and described in poignant terms the fates of billions of offspring produced during that mass movement the many ways that death can and does come to far more than 99 of the helpless eggs and larvae in a hostile ocean environment. But Ms. Carson published her first book about the sea in a simpler time well before toxic industrial chemicals were found to be so lethal to marine organisms and more than two decades before she published her major work Silent Spring 1962 that aroused public sensitivities to the menace of pesticides in the terrestrial environment. So in the spring of2006 as in every other spring the mackerel will again move in great masses over the continental shelves of the Middle Atlantic States. As they migrate they will as usual produce uncountable numbers of offspring except that now the beleaguered defenseless young will encounter an additional source of disability and death in the form of increasing levels of chemicals synthesized by man and discarded from his wasteful industrial processes. Developing embryos within the floating eggs and hatched larvae in the surface waters will encounter strange and often lethal man-made chemical creations PCBs DDT polycyclic aromatic hydrocarbons and many others with which marine animals have had no previous evolutionary experience and to which the younger life stages are particularly vulnerable. The precise percentage of all the mackerel offspring that will be disabled or killed this coming spring by the relatively new environmental stressor pollutants at lethal levels is not easily determined but it is substantial