La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	A review of population estimates of the Eurasian Black Tern Chlidonias niger niger
Auteurs :	Ian van der Winden, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (129(1) 2008)
Article en page(s) :	47-50
Résumé :	The recent updates of estimates of the Eurasian Black Tern population size are reviewed. Based on known densities in European countries, the average density in Asia is calculated. The total Eurasian population is estimated at 120,000 and 248,000 pairs. This leads to a lion-breeding population size of 300,000 to 620,000 and a 4,600 1% Ramsar threshold. This is lower than in recent updates, but I assume it to be more realistic. There are strong indications of a recent decline, as numbers in stopover areas are lower and even declining at the most important European stopover site Ijsselmeer.

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