Overfishing has had an incredible effect on the quantity and diversity of fish present in the oceans of the world, along with greatly reducing biodiversity. Because of this decline in fish numbers, and a number of complete fishery collapses, the industry is becoming increasingly dependent upon only a handful of shellfish species. And now, new
Previous studies of plant and animal migrations have offered indications that something — perhaps rising temperatures — was driving species northward and/or to higher altitudes. But these studies were isolated and doubts remained as to the true trigger of these movements and migrations. But now comes evidence from the largest-scale analysis to date that such northward, migratory expansions and accelerating movements up-slope are largely attributable to warming and climate change. The ecological impacts of these shifts are unknown at present.
