How Wolves Change Rivers – by George Monbiot
Rating: ****
This TEDx Talk was about how the wolves changed the
behaviour of the rivers, animals and vegetation. In 1995 wolves were
reintroduced at Yellowstone National Park in the United States, and the
scientists discovered that the wolves had changed the behaviour of the deer and
caused them to avoid certain spots in the park where they could get trapped
while being hunted by wolves. This caused or the vegetation in those areas to
grow back. With the vegetation growing back, it brought in more song birds and
beavers since they do enjoy the trees. The number of bears also rose thanks to
the regeneration of shrubs with berries. The rivers changed too because there
were more trees and roots that would stop the erosion happening on the river
banks. With the wolves killing coyotes, the number of rabbits and mice rose and
so did the number of hawks, weasels, foxes and badgers. The carcases that the
wolves would leave would be eaten up by eagles, and ravens, which would cause
for their numbers to start rising also. Wolves may be small in group but can
make a huge change in the ecosystem around them.
This TEDx Talk was very eye opening and interesting to
listen to. I made me think about how fragile our ecosystem is and how fragile
the food chain can be. It’s like a domino effect that that if you remove one,
it can screw up the whole chain. Just by adding one extra piece to the
ecosystem at Yellowstone Park, it changed everything for the better and not the
worst.
Samantha,Meloche TEDx Talk: https://www.youtube.com/watch?v=ysa5OBhXz-Q
Such a fascinating TED Talk. An email has been sent with feedback.
ReplyDelete