Looking for the Asian Longhorn Beetle

No, I'm not bird watching.

I'm actually looking for the tell tale signs of the highly destructive Asian Longhorn Beetle on one of its favorite host species on the Commonwealth Avenue Mall -- the maples.

This event was organized by BU's Global Day of Service in partnership with the Friends of the Boston Public Garden, who provided guides and information sheets to identify the pest.

The Asian longhorn beetle was discovered in the Worcester, MA, area in August 2008 and has since been responsible for the decimation of more than 300,000 trees. To find the beetle, you must scan the entire tree for its exit hole, which is a perfect circle, slightly smaller than a dime. Given these tall trees on Commonwealth Avenue, you have to get a good method down so you don't keep scanning the same branches over and over again. And the brisk wind on Saturday made it extra challenging to hold the binocs steady, but we didn't find anything that was cause for concern.

Besides maples, the ALB also likes other hardwoods like birch and elm.

You can imagine that the state of Massachusetts is intent on eradicating this pest. Here's a guide
to identifying it and here is where to file a report. Invasive species, together with habitat fragmentation, pollution, overexploitation and climate change, is one of the main causes of the present biodiversity crisis.

A plague of frogs -- and other invasive species

If you're been reading at all about biodiversity loss, you know that there are five main causes to the present crisis, all of which are human-induced: habitat fragmentation, pollution, over-exploitation, introduction of invasive species and climate change. You may know that the dodo didn't go extinct because it was poorly adapted to its environment on the island of Mauritius; it went extinct because it was over-hunted by sailors and because the introduced rats, pigs, dogs and cats ate its eggs, which were laid on the ground.

Here's a list of 10 other species introductions that have gone awry, a reminder that we really don't understand ecosystems very well.