corvus
Posted : 10/15/2006 6:23:05 PM
Ron, while I agree that the criticisms of the FAP don't detract from the value of Lorenz's reserach, I believe they are fairly important criticisms. The thing about behaviour is that it can be interpreted in a large variety of ways, so being super specific about definitions is really important just to make sure everyone is talking about the same thing.
I agree with Vinia that the development of FAPs may be triggered by the environment. To me, it's the development of the FAP that's really interesting. Often animals are born knowing the basics of what being a member of their species is all about, but have to refine their skills before they can be competetive in the mating game. For example, birds are usually born knowing how to sing the way the rest of their species does, but if you've ever heard a young bird attempting to replicate an adult of it's species it's pretty hilarious. They need lots of practice before they sound good. I think there have been studies where they raised birds in isolation and discovered that the birds did know instinctively what they should sound like, but needed to hear adult songs to refine their technique. To me, that's an excellent example of what people here are talking about. It's pretty clear cut how it comes about and what the influences are.
kennel_keeper, even imprinting isn't that clearcut. Cuckoos are raised in other bird's nests, but still know they're a cuckoo when they fledge. I also know that rock wallabies fostered to tammar wallaby mothers have no doubt that they're rock wallabies and should therefore be climbing trees despite their mother's distress when they hop up into places a tammar wallaby can't go. And yet, other animals imprint blindly to whoever feeds them as a baby. It can be unpredictable, and unpredictable observations are a real pain in the neck for any behavioural ecologist. They're meaningless until you can find a pattern.
Talking about stimuli, I'm reminded of the fact that baby lambs are born with one stomach. They only develop the other three when they start nibbling on grass or other vegetation. If you raised a lamb in a lab and only ever fed it milk, it would never become a ruminant. It's not behaviour as such, but it's interesting in that behaviour can stimulate physiological development as well.