Another thought about this. Is it a valid thing to use the number of
species seen as an indication of whether the dog's presence affects the
number of bird individuals present? Even if you were to still see 100
species, it would be a difficult thing to check if you're still seeing
the same numbers of those species. Unless you were actually counting
individuals, I think the number of species seen only indicates how many
species were totally driven away.
wrote on :
> I haven't rally followed this thread closely but wonder if we
> are looking at the right variables here, eg is it simply the
> dog or human or their behaviour, or the noise of their toys,
> the colour of their clothing etc? I saw nearly 100 species on
> a walk I used to regularly do in Brisbane and the diversity
> and bird behaviour at any period never seemed to change
> whether I was with my dog or not. Obviously there are places
> such as roost or breeding sites where it would seem obvious
> that minimal disturbance would be advisable (but also taking
> account of the fact that the presence of "natural" predators
> is probably important for ecological balance - unless of
> course that balance has been thrown way out of kilter by
> human interference) but we need to very careful about
> extrapolating from such findings.
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