Re: Primate communication linked to social bonding

On Fri, 26 Aug 2005 23:45:21 +0200, Lance wrote:

> The data analysis showed strong relationships between vocal repertoire
> size and group size, as well as between repertoire size and the amount of
> time spent grooming, says McComb: "This suggests that changes in
> communication can facilitate changes in social behaviour."

> The analysis only revealed correlations, so it was impossible to
> determine causal relationships - whether increases in vocal repertoire
> caused increases in group size and time spent grooming, or vice versa.

Neither relationship seems probable.
All of these factors are more likely dependant on the amount/density of
food in the local environment. A richer food supply allows larger groups
(which are preferable to help spot predators and permit enhanced mate
choice). More easily obtained food allows more time for non-foraging
social activities like grooming and vocalising.

Any scientific study elucidating correlations and hoping to infer causal
links should include what are called 'confounding variables', like food
availability in this case. It's not enough to look at just your two or
three favourite factors and have a plausible story.

Toby
.