Saturday, October 11, 2014

Resistance is futile against alien Asian invaders

Carl Zimmer reports in the NY Times:
Many alien species in the northeastern United States, including the emerald ash borer and Japanese barberry, invaded from East Asia. But the opposite is not true. Few species from the northeastern United States have become problems in East Asia. ...

But as far back as the 19th century, some scientists saw a role for evolution. In “The Origin of Species,” Charles Darwin wrote that we shouldn’t be surprised by native species “being beaten and supplanted by the naturalised productions from another land.”

Darwin reasoned that these victories were inevitable. Different species might adapt to a particular ecological niche in different parts of the world. Put them in the same place, in the same niche, and one might well outcompete the other because it has evolved superior attributes. ...

Dr. Fridley speculated that a similar imbalance could explain why the Northeast gets so many invasive species from East Asia. Today both regions have a similar climate. But the United States was buried by glaciers during the Ice Ages, while East Asia was spared. Its species continued to grow more diverse, to evolve and eventually to become superior competitors — ready to invade, once humans started acting as their chauffeurs. ...

The evolutionary imbalance hypothesis, as Dr. Sax and Dr. Fridley call their hypothesis, could have a grim implication for conservation biologists trying to preserve native species: They may be fighting millions of years of evolution.

“If that’s true, the phrase, ‘Resistance is futile’ comes to mind,” said Dr. Stachowicz.
I wonder if anyone is applying this analysis to human beings. The Jains of India have been declining in numbers, but they are quite prosperous outside of India.

Asian people and customs are welcomed in the USA, but China tries to limit American infludence there. NPR reports:
"There are many Christians and Catholics among the pro-democracy leaders in Hong Kong, the older generation," says Joseph Cheng, who teaches political science at City University of Hong Kong.

Cheng, 65, is also a pro-democracy activist and a Christian himself. He says many of the movement's leaders were educated in Hong Kong's Christian missionary schools, which helped shape their beliefs.

"There is this Christian spirit," says Cheng, who wears a yellow ribbon pinned to his shirt pocket — a symbol of the movement. "You are more willing to suffer. Social justice means more to you."

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