These lines indicate the average change in latitude and depth for 105 marine fish and invertebrate centers of abundance in the U.S., 1982 to 2013. Details of the calculation are explained here.
When combined with information on changing temperatures in the oceans around North America, these data suggest that climate may be driving many marine fish and invertebrates to shift north and deeper. These shifts affect fisheries by changing where, when and which species can be caught.
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