Silvereyes do all three, and these movements are not (necessarily)
related to age. Different subspecies show different patterns of
movement, ranging from sedentary to resident to part-migratory, with
evidence of seasonal altitudinal movements in se Aust and NZ. Some
western Vic birds also appear to move in a NW-SE pattern into SA. The
Tasmanian subspecies is part-migratory; large numbers winter in Tas,
but many cross Bass Strait and travel up the eastern seaboard, and
some also filter through a western route into SA; further
complicating this is that banding records suggest that individual
birds do not migrate from Tas every year. So you have variation in
movement patterns both between and within subspecies.
cheers,
James
At 09:32 PM 8/31/2006, L&L Knight wrote:
Following on from Dan's description of the various migrants that
visit the Lamington Plateau in SEQ, it might be interesting to
discuss species that have populations/groups that:
1. Migrate latitudinally;
2. Migrate altitudinally;
3. Don't migrate at all.
Do we have examples of species in Australia that do all three? In
particular, are there species that have groups that fit into each of
these groups for their entire lifecycles rather than moving from one
pattern to another as they age?
Regards, Laurie.
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