Hi folks
All efforts to unsubscribe from the list have failed. Can you please unsubscribe me from your end.
Thanks and happy birding
Ricki Coughlan
On 10/12/2010, at 12:03 PM, birding-aus-request@vicnet.net.au wrote:
> Send birding-aus mailing list submissions to > birding-aus@vicnet.net.au > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.vicnet.net.au/mailman/listinfo/birding-aus > or, via email, send a message with subject or body ‘help’ to > birding-aus-request@vicnet.net.au > > You can reach the person managing the list at > birding-aus-owner@vicnet.net.au > > When replying, please edit your Subject line so it is more specific > than “Re: Contents of birding-aus digest…” > > > Today’s Topics: > > 1. Re: Silver Gull Aerial Predation (Ben Hope) > > > ———————————————————————- > > Message: 1 > Date: Fri, 10 Dec 2010 10:29:13 +1100 > From: Ben Hope > Subject: Re: [Birding-Aus] Silver Gull Aerial Predation > To: birding-aus@vicnet.net.au > Message-ID: > > Content-Type: text/plain; charset=ISO-8859-1 > > Michael, > > I agree that the availability of rubbish leads to over abundance of > many > species, particularly at land fill sites. Although if the rubbish > were to > disappear over night (or even over a longer period as silver gulls > can live > ~30 years) it would probably result in prey switching by the > scavengers. > This may result in depleted insect and other prey taxa numbers while > the > scavenger numbers correct themselves. THe birds may also become > aggressive > as food resource become more limited. As some one else pointed out > reducing > silver gull numbers may also impact on other fauna (notably predators > feeding on silver gull and other species competing for the same > resources) > now dependant on the over abundance species as a food resource. > > It is an interesting problem, but not one with an easy answer! > > Cheers, > Ben > > > Date: Thu, 9 Dec 2010 23:21:40 +1100 > From: “michael norris” > Subject: Re: [Birding-Aus] Silver Gull Aerial Predation > To: “Jon Irvine” , “‘birding-aus’” > > Message-ID: < > 88148C0E216B4D8BB2F855CC6C7F062B@michael1> > Content-Type: text/plain; format=flowed; charset=”iso-8859-1″; > reply-type=original > > Hi Jon > > No – it’s not good to see them catching live prey, especially at > night. > > German research has indicated, if not proved, that light pollution has > serious effects on insect diversity and abundance. For instance, the > “vacuum > cleaner” impact sucks insects into the light and, for some species > where one > sex does not fly, this means the potential partners die in > disproportionate > numbers when they are killed by bats… and silver gulls…. > > And why are the gulls feeding on live prey? Because their vastly > increased > numbers, and now all-year round breeding, in urban areas as a result > of > trash means there are many more individuals short of day time food > that need > to hunt at night. > > I guess we agree the trash is the issue to be tackled. Ian Temby’s > work on > silver gulls in Melbourne includes accounts of roof top nests > surrounded by > chicken bones. And estimates the damage caused by their excretions > etc in > the millions. > > Michael Norris > > > —————————— > > _______________________________________________ > birding-aus mailing list > birding-aus@vicnet.net.au > http://lists.vicnet.net.au/mailman/listinfo/birding-aus > > > End of birding-aus Digest, Vol 57, Issue 16 > *******************************************
===============================
To unsubscribe from this mailing list, send the message: unsubscribe (in the body of the message, with no Subject line) to: birding-aus-request@vicnet.net.au
http://birding-aus.org ===============================