Migration Pattern Caught On Film

Check this article for great migration photos caught on film.

The discussion of migrants is actually more serious than we might think as Catherine explains on the New Scientist Environment:

Take, for instance, salmon. Born in rivers, they head out to sea to fatten up as adults. A couple of years later, they head back inland en masse to mate and die. Their decaying carcasses enrich the rivers and feed, among others, the next generation of salmon. “Salmon fry are literally sustained by their parents,” say Wilcove and Wikelski.

More importantly, by moving around, urinating, defecating and decaying along the way, salmon like all other migrants help spread nutrients around ecosystems.

I guess that the decreasing numbers of fish and birds means less nutrients for the future generations and another imbalance to the already fragile ecosystems.