Newsletter
Ardea alba Linnaeus, 1758
by Ms. Nur Aina Amira Binti Mahyudin, Ms. Nur Athirah Binti Fauzi & Mr. Kaviarasu Munian
Newsletter
Ardea alba Linnaeus, 1758
by Ms. Nur Aina Amira Binti Mahyudin, Ms. Nur Athirah Binti Fauzi & Mr. Kaviarasu Munian

Ardea alba, commonly known as Great White Egret or Great Egret was first described by Linnaeus in the year 1758. Previously, it was classified under the genus Casmerodius as C. albus (Sibley & Monroe 1990, 1993), but recently Hoyo and Collar (2014) revised its genus and placed it under the genus Ardea. The four subspecies of Ardea alba are classified according to a different region where populations in the southern Palearctic (from central Europe to Russian Far East) known as A. alba, while A. modesta population are distributed in India to northeastern China and Japan to Australia. In addition, the subspecies A. melanoryncha is recorded in Africa, and Madagascar and A. egretta found in North and South America.

Compared to other egret groups, this species has a much larger body size. The wingspan of this bird can reach up to 145 cm, and the body length ranges from 94 cm to 104 cm. It has a long S-shaped neck, long leg, white body and a dagger-like bill. The non-breeding adult has a yellow bill with blackish legs, while the breeding adult has a blackish bill and a reddish leg. The juvenile has a similar morphology as the non-breeding adult. In flight, its neck is tucked in, and the legs extend far from its tail.

The species can be found in both freshwater and saltwater habitats such as coastal and inland water bodies, paddy fields and mangroves (del Hoyo et al.,1992). It is a diurnal feeder and commonly active during dawn and dusk in coastal areas where its feeding behavior is influenced by the tide cycle (Kushlan & Hancock, 2005). During hunting, the bird stands still observing its prey, and as its target passes by, it will strike with its bill at an incredible speed. The diets for this species include fishes, frogs, crustaceans, and other small aquatic animals. In drier habitats, lizards, small birds and mammals are some of the choices of its food (del Hoyo et al., 1992).

An average life span of Ardea alba in the wild can be up to 15 years. The populations in the tropics are usually bred in a place (del Hoyo et al., 1992) and sometimes will migrate to another habitat when the rainfall season starts (Brown et al., 1982). Ardea alba usually moves locally in response to breeding or wintering needs. Thus, it is resident or partially migrant species when one fraction of the population is migratory while the others are sedentary (CorrĂȘa et al., 2016). Commonly, the Great Egret starts making its nest when the raining season peaks as the food resources are abundantly available (Kushlan & Hancock, 2005). Great Egret in Palearctic and Nearctic ecozone will begin to migrate when comes its breeding season (Flint et al.,1984; del Hoyo et al., 1992). Kushlan and Hancock (2005) reported that the populations in the temperate region breed in the summer and winter seasons. Once the breeding season over, the bird will migrate to a new breeding site (del Hoyo et al., 1992).

The conservation status for Ardea alba in the IUCN Red List of Threatened Species as Least Concern (LC) due to its extensive distribution range. Besides, the population size is large. Thus, it does not approach the threshold for Vulnerable. However, in the past, Great Egret were highly threatened by hunting for their white feather and used in plume trade. Nowadays, the species suffered from loss and degraded of wetland habitats due to invasions, land reclamations and pollution. Ardea alba is totally protected under the Wildlife Conservation Act 2010 (Act 716) in the second scheduled where hunting is not permitted.

References

  1. BirdLife International. 2019. Ardea alba (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2019: e.T22697043A155465940. Retrieved March 09, 2021, from https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T22697043A155465940.en
  2. Brown, L.H., Urban, E.K. & Newman, K.B. (1982). The Birds of Africa, Volume 1. Academic Press, London. pp. 521.
  3. Correa, T.C., Del Lama, S.N., De Souza, J.R. & Mino, C.I. (2016). Genetic structuring among populations of the great egret, Ardea alba egretta, in major Brazilian wetlands. Aquatic Conservation: Marine and Freshwater Ecosystems. 26 (2): pp. 333-349
  4. del Hoyo, J. & Collar, N.J (2014). HBW and Birdlife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK. pp. 904.
  5. del Hoyo, J., Elliott, A. & Sargatal, J. (1992). Handbook of the Birds of the World, Vol. 1: Ostrich to Ducks. Lynx Edicions, Barcelona, Spain, Spain. pp. 696.
  6. Flint, V., Boehmer, L., Kostin, Y.V. & Kuznetsov, A.A. (1984). A field guide to birds of the USSR. Princeton University Press, Princeton, New Jersey.
  7. Kushlan, J.A. & Hancock, J.A. (2005). The Herons. Oxford University Press, Oxford, U.K.
  8. Pratt, H.D. (2011). Observations on species limits in the Great Egret (Ardea alba) complex. Journal of Heron Biology and Conservation. 1 (5): pp. 5
  9. Sibley, C.G. & Monroe, B.L. (1990). Distribution and Taxonomy of Birds of the World. Yale University Press, New Haven, United States of America.
  10. Sibley, C.G. & Monroe, B.L. (1993). A supplement to 'Distribution and Taxonomy of Birds of the World'. Yale University Press, New Haven, United States of America.
QR Code
Scan QR code for mobile experience

Other articles

Dendrelaphis cyanochloris (Wall, 1921)

Ms. Nur Aina Amira Binti Mahyudin   •   15 Sep 2021   •   231 views

Galeopterus variegatus Audebert, 1799

Ms. Nor Hazwani Binti Ahmad Ruzman & Mr. Mohammad Shahfiz Azman   •   31 Aug 2021   •   242 views

Cycas clivicola K.D. Hill

Ms. Fatin Qurratul 'ain Binti Saberam   •   16 Aug 2021   •   336 views

Sterculia foetida L. (Malvaceae)

Mrs. Norzielawati Bt. Salleh   •   30 Jul 2021   •   461 views

Cheilinus undulatus Ruppell, 1835

Mr. Tan Kok Kiat   •   15 Jul 2021   •   329 views
Today, there are less than 200 Malayan tigers left in our country.
#SaveOurMalayanTiger. Visit www.harimau.my
Malaysia Biodiversity Information System (MyBIS)
Copyright © 2021, Ministry of Energy and Natural Resources (KeTSA). All rights reserved. DISCLAIMER - The Malaysian Government, and Ministry of Energy and Natural Resources (KeTSA) shall not be liable for any loss or damage caused by the usage of any information obtained from this website. By entering this site, you acknowledge and agree that no portion of this site, including but not limited to names, logos, trademarks, patents, sound, graphics, charts, text, audio, video, information or images are either MyBIS property or the property permitted by third-party and shall not be used without prior written approval from the owner(s).
Best viewed using latest Mozila Firefox, Google Chrome and Internet Explorer 10 with Resolution 1024 x 768px or above. Version 2.0 / 2016