ASPECTS OF THE BREEDING BIOLOGY OF THE REEF EGRET Egretta sacra
| Posted: |
19/07/2021 |
| Author(s): |
Neil McKilligan |
Reef Egret
Egretta sacra nest site characteristics, nest attendance, vocalizations and eggs and chicks are
described. Male and female Egrets spend equal time at the nest site at all stages of nesting. Incubation typically
involved long sittings (mean about 21.6 hours, standard deviation (s) = 9.46). The timing of feeding and nest
attendance is correlated with the tidal cycle, but differences between Reef Egrets and colonial nesters, such as
the Cattle Egret
Ardeola ibis, might also come from the greater security provided by solitary nesting. Prior to
egg laying, the Reef Egrets leave their nests unattended for long periods while they feed at low tide. Male Cattle
Egrets guard their nests continuously at this stage. The Reef Egret guards advanced chicks whereas the Cattle
Egret does not. This guarding is only at high tide when there are fewer feeding opportunities and they perch
some distance from the nest, possibly to avoid advertising its location. Compared with other egret species the
Reef Egret would appear to have a small clutch and a long nesting season. A second brood is also indicated
for some pairs. These may be adaptations to a chronic shortage of food for egrets in the coral reef environment.
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