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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Monitoring Common Tern Sterna hirundo breeding success to assess ecological effects of pipeline construction in the Wadden Sea
Auteurs :	Dietrich Frank, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (119(3-5) 1998)
Article en page(s) :	235-241
Résumé :	In 1994, a gas-pipeline was built through the National Park 'Niedersachsisches Wattenmeer' between Baltrum and Langeoog on the German North Sea coast. To assess the impact on the Wadden Sea ecosystem, an ecological monitoring programme was set up which included monitoring the breeding success of Common Terns on Baltrum. The colony, located in a saltmarsh about 4 km west of the pipelaying route, was studied annually from 1993 to 1995. Data from the construction year (1994) were compared to years prior to and after the construction as well as between Baltrum and a reference colony at Minsener Oldeoog (40 km away). Results concerning reproductive output, quantity and quality of nestling food and body mass development of chicks provided no evidence for a negative impact of the pipeline construction on Common Terns in 1994. Favourable weather conditions and good prey availability in 1994 resulted in an average breeding success of 1.8 chicks fledged per pair. Monitoring of Common Tern breeding success proved to be a powerful tool not only for long-term bio-monitoring, but also to assess short-term impacts on the Wadden Sea ecosystem. An essential requirement, however, are within-season reference data from comparable colonies as well as data from earlier years.

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