I have long been of the impression and think it correct, that parrots are primarily seed eaters. This was not my invention but I believe supported by good evidence.
On that basis, the seed is the food they are seeking, rather than the fruit, although they will consume fruit also. On that basis, parrots almost certainly digest all or most of the seed they eat, which thus is not passed through them. So parrots are likely
to be minimally if at all involved in seed dispersal. This is different from the situation of
Silvereyes, Currawongs and others that spread invasive species into the natural areas
those being largely fruit (not seed) eaters, it appears do not destroy the viability of seed and are dispersers. Therefore I do not easily or at all accept Rosemary’s last point.
Of course the situation could be more involved and there may be variations between plants and between parrot species. If there is evidence that I am wrong in my main point, I would like to be shown that I should abandon that idea.
Philip
From: Rosemary Blemings [
Sent: Wednesday, 29 May, 2019 7:12 PM
To: COG Chat
Cc: Ryu Callaway; Chris Davey; Sandra Henderson; ; ;
Subject: Re: [canberrabirds] Superb Parrots in the Hughes area
Thank you all for sharing these Superb Parrot sightings.
As there was a photo and a mention of the Superbs eating Privet berries:
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do the birds’ digestive systems enhance or destroy the berries’ viability?
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Privets and Cotoneasters are the commonest berried invasive species in the ACT as numerous volunteer and professional landcarers will attest.
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The ACT’s avian emblem photographically-specialises in eating Hawthorn berries. (Hawthorns are now rarer in suburban gardens than the other two invasives.)
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Ironic that spectacular birds such as Superb Parrots and Gang - Gangs are helping Silvereyes, Currawongs and others spread invasive species into the natural areas all species so desperately need!
