February 23 - March 1, 2014: Issue 151

 Endangered Little Tern Fishing off Mona Vale Beach - Summer Birds 2014

 Endangered Little Tern Fishing off Mona Vale Beach

The Little Tern (Sternula albifrons) is listed as Endangered (Threatened Species Conservation Act 1995 (New South Wales): December 2013) as Sternula albifrons the Little Tern is a very small migratory tern (21-25cm) with a wingspan of 41–47 cm. It is found in several locations around the world. In Australia it is most commonly found breeding from Tasmania to the Gulf of Carpentaria. Like many terns its appearance changes between breeding and non breeding plumage.

This one spotted fishing at Mona Vale beach is the first we’ve espied this Summer. By its markings, especially the distinctive stripe to its bill, indicates this one is a breeding bird.

The Little Tern breeds on the coasts and inland waterways of temperate and tropical Europe and Asia. It is strongly migratory, wintering in the subtropical and tropical oceans as far south as South Africa and Australia.

There are three subspecies, the nominate albifrons occurring in Europe to North Africa and western Asia; guineae of western and central Africa; and sinensis of East Asia and the north and east coasts of Australia.

The Little Tern breeds in colonies on gravel or shingle coasts and islands. It lays two to four eggs on the ground, which is why you need to keep your dogs from running in areas set aside for the birds we share the planet with. 

The Little Tern feeds by plunge-diving for fish, usually from saline environments. The offering of fish by the male to the female is part of the courtship display.

Some people confuse this lovely bird with other species, especially the Fairy Tern and Saunders's Tern, because of its size and white forehead in breeding plumage. Its thin sharp bill is yellow with a black tip and its legs are also yellow. In winter, the forehead is more extensively white, the bill is black and the legs duller. The call is a loud and distinctive creaking noise.

At the beginning of the 19th century the Little Tern was a common bird of European shores, rivers and wetlands, but in the 20th century populations of coastal areas decreased because of habitat loss, pollution and human disturbance.

The loss of inland populations has been even more severe, since due to dams, river regulation and sediment extraction it has lost most of its former habitats. The Little Tern population has declined or become extinct in many European countries, and former breeding places on large rivers like the Danube, Elbe and Rhine ceased. Nowadays, only few river systems in Europe possess suitable habitats; the Loire/Allier in France, the Vistula/Odra in Poland, the Po/Ticino in Italy, the Daugava in Latvia, the Nemunas in Lithuania, the Sava in Croatia and the Drava in Hungary and Croatia. The status of the Little Tern on the rivers Tagus and lower Danube is uncertain.

The Drava population is one of the most threatened. Old fashioned water management practices, including river regulation and sediment extraction, endanger the remaining pairs. Only 15 pairs still breed on extensive sand or gravel banks along the border between Hungary and Croatia. The WWF and its partners are involved in working for the protection of this bird and this unique European river ecosystem. The Little Tern is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

In Australia, Little Terns have hybridised with Fairy Terns (Cox & Close 1977; Higgins & Davies 1996; McCarthy 2006; Ross et al. 1999). Extralimitally, hybridisation with the Common Tern has also been reported (McCarthy 2006).

References 

Department of the Environment (2014). Sternula albifrons in Species Profile and Threats Database, Department of the Environment, Canberra. Available from: http://www.environment.gov.au/sprat..

NSW: Listed as Endangered (Threatened Species Conservation Act 1995 (New South Wales): December 2013) as Sternula albifrons

QLD: Listed as Endangered (Nature Conservation Act 1992 (Queensland): July 2012) as Sternula albifrons

SA: Listed as Endangered (National Parks and Wildlife Act 1972 (South Australia): June 2011) as Sterna albifrons

VIC: Listed as Threatened (Flora and Fauna Guarantee Act 1988 (Victoria): February 2014) as Sterna albifrons

Little Tern. (2014, January 8). In Wikipedia, The Free Encyclopedia. Retrieved  from http://en.wikipedia.org/w/index.php?title=Little_Tern&oldid=589776848

Fishing 

 

 

Report and Pictures by A J Guesdon, 2014.