Exotic species usually spell trouble for natives.
Lake trout illegally released in Yellowstone Lake crippled native cutthroat trout populations and raised havoc with the entire ecosystem, including the grizzly bears at the top of the food chain.
Invasive spotted knapweed, unpalatable to most livestock and wildlife, crowds out native forage essential to game such as elk.
But the jury is still out on the Eurasian collared-dove (ECD), a non-native species that’s taking North America by storm.
ECDs have infiltrated the…