CHANGES WITH TIME OF DAY IN THE SPECIES AND NUMBERS OF BIRDS SEEN IN WANDOO WOODLAND
| Posted: |
12/09/2021 |
| Author(s): |
Graham W. Arnold |
Birds in four 2 ha portions of a 200 ha Wandoo
Eucalyptus wandoo woodland were censused
either in the first two hours or second two hours after sunrise. Many (39 percent) of the species were
recorded in only one of the two time periods, while the numbers of half of the species also differed
between the periods.
The birds in a separate four hectare portion of the woodland were censused nine times a day at
hourly intervals from dawn on three days (13 January, 7 May and 10 September 1981). The species,
number of species and number of individuals per species recorded, changed with the time of day. The
number of species recorded was relatively constant (10) over the first four hours, then fluctuated.
However, one census detected only 50 percent of the species found over nine censuses. Fifty
percent of species were recorded at only one or two censuses.
Reasons for these findings and their bearing on future bird census work are discussed.
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