CHANGES IN THE ABUNDANCE OF SILVEREYES IN A CENTRAL VICTORIAN VINEYARD DURING THE GRAPE RIPENING PERIOD
| Posted: |
05/08/2021 |
| Author(s): |
Thomas C. Burton |
Population parameters of Silvereyes in Chateau Leamon, a vineyard in central Victoria, were
estimated on the basis of capture-recapture methods employed during the grape ripening seasons
1988-1993, using the Jolly-Seber model, the Peterson model and a model of Seber. In the context of
low survival rates, results from the Jolly-Seber model were erratic, and as short seasons yielded few
data, the Jolly-Seber model was too wasteful. Populations generally rose during a season, despite the
loss of many Silvereyes from the population, indicating that birds moved into the vineyard during the
season. Annual survival rates were very low (mean 25% p.a.). The Tasmanian subspecies typically
arrived between late March and early April, and formed up to 26% of the total Silvereye population.
Few Silvereyes banded in the vineyard were recovered elsewhere.
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