To Migrate or Not to Migrate

To: L&L Knight <>, Birding Aus <>
Subject: To Migrate or Not to Migrate
From: "James O'Connor" <>
Date: Fri, 01 Sep 2006 11:03:58 +1000
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.



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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