Sunday, January 27, 2008

Commensal Mice

Here's an excerpt from an article I read yesterday in New Scientist (in my opinion, the best science magazine out there):

Beastly tales: Rewriting human history

by Bob Holmes, 19 January 2008

ACCORDING to the history books, the Madeira archipelago 600 kilometres west of Africa was discovered in 1419 when Portuguese mariners were blown off-course by a storm. In Roman times Pliny and Plutarch wrote about islands that might be Madeira, but there is no definite account of the islands, nor any signs of people, prior to the arrival of the Portuguese. The mice of Madeira Island, however, tell a different and unexpected story.

The mice are not native to the island and must have arrived on European ships. Genetically, they most closely resemble the mice of Portugal. However, some of their DNA has strong similarities to that of mice found in Scandinavia - a strong hint that Viking ships found Madeira long before the Portuguese. "It might have been a temporary occupation, or just a few boats landing for a short period of time," says Jeremy Searle, an evolutionary biologist at the University of York in the UK and an author of the study (Heredity, vol 99, p 432). "But the mice are telling us something that no artefact so far has told us."

What this piece is saying is that human history can be uncovered by looking at the plants and animals that accompany us, either as stowaways or as sources of food. Those commensal mice that have been a part of our lives since humans first started storing grain, have been following humans on their migrations around the world.

It's not just lab mice that have been teaching us about ourselves.

Here's a link to the original paper. Here's more about Archaezoology.

BTW, "kilometres" and "artefact" are explained by the London address on the masthead.

Wednesday, January 16, 2008

The Sminthophobe

There were mice scrabbling in my walls yesterday evening, so what did I do? I went running to my Dear Husband, Sminthius, to come to my rescue. He set some traps in the attic, but I was still awakened at four am by the sounds of scratching and gnawing.

How many lab mice have I handled in my life? I daren't count. Why can't I stand a mouse in my house? I'm a sminthophobe.

Lab mice and wild mice are very different animals. (I could write a book...)

In fact, wild mice are very different from each other. Of course there are different species, but they can be classified another way, by their relationships with humans.

Truly wild mice, ABORIGINAL mice, live their lives completely independently of humans. They don't eat our food or invade our homes. They may never have contact with humans or our stuff at all.

COMMENSAL mice, like the ones in my ceiling, rely on humans for food and/or shelter, even if it's only for a part of their lives (like winter).

FERAL mice are mice that used to be commensal, but have abandoned their human neighbors and "gone native."

So now you know.

I still want them OUT OF MY HOUSE!