Data on the breeding success of several characteristic coastal breeding bird species in the Wadden Sea have been collected each year since 2015. Ten bird species considered representative of specific habitats and food groups are being monitored. The monitoring scheme on breeding success in coastal breeding birds is run as an ‘early warning system’ to follow the reproductive capacity of the bird populations in the Wadden Sea and understand the processes underlying fluctuations in populations. It is a valuable addition to the monitoring of population numbers and is carried out under a trilateral agreement with Germany and Denmark (TMAP). The data are also included in the OSPAR biodiversity indicator B3 under the Marine Strategy Framework Directive. The 2019 results indicate that little has changed in the poor breeding success observed in previous years, although there were some positive exceptions locally and for some species, partly related to special conservation measures.

Data have been collected on the breeding success of several characteristic coastal breeding bird species in the Wadden Sea each year since 2015. Ten bird species considered representative of specific habitats and food groups are being monitored in a trilateral context. The monitoring scheme on breeding success in coastal breeding birds is run as an ‘early warning system’ to follow the reproductive capacity of the bird populations in the Wadden Sea and understand the processes underlying fluctuations in populations. It is a valuable addition to the monitoring of population numbers and is carried out under a trilateral agreement with Germany and Denmark (TMAP). The data are also included in the OSPAR biodiversity indicator B3 under the Marine Strategy Framework Directive. The 2018 results indicate that little has changed in the poor breeding success observed in previous years, although there were some positive exceptions locally and for some species, partly related to special conservation measures.

Data have been collected on the breeding success of several characteristic coastal breeding birds in the Wadden Sea each year since 2005. Ten birds species considered representative of specific habitats and food groups are being monitored. The monitoring scheme on breeding success in coastal breeding birds is run as an ‘early warning system’ to follow the reproductive capacity of the bird populations in the Wadden Sea and understand the processes underlying fluctuations in populations. It is a valuable addition to the monitoring of population numbers and is carried out under a trilateral agreement with Germany and Denmark (TMAP). The results from 2015–2016 and an analysis of data series from the period 2005–2016 (sometimes longer) show that several species on average reared too few young to sustain stable population size in many of these years, especially the Eurasian Oystercatcher, Pied Avocet, Common Tern and Arctic Tern, and in recent years also the Black-headed Gull, whose breeding success has significantly declined since 1995. Other species showing a significant decline in breeding success are the Spoonbill and Common Tern. The only species to show any significant improvement in breeding success since 2005 is the Lesser Black-backed Gull

Data have been collected on the breeding success of several characteristic coastal breeding birds in theWadden Sea each year since 2005. Ten birds species considered representative of specific habitats and foodgroups are being monitored. The coastal breeding birds reproduction monitoring network is run as an ‘earlywarning system’ to follow the reproductive capacity of the bird populations in the Wadden Sea andunderstand the processes underlying fluctuations in populations. It is a valuable addition to the monitoring ofpopulation numbers and is carried out under a trilateral agreement with Germany and Denmark (TMAP). Theresults from 2014 show that many species of coastal breeding birds are still facing difficulties. The breedingsuccess of Eurasian Oystercatcher, Pied Avocet, Black-headed Gull, Common Tern and Arctic Tern inparticular is too low or much too low to maintain a stable population. In contrast, the breeding success ofHerring Gull is better than a few seasons ago. Erection of electric fencing around breeding sites of PiedAvocet and Black-headed Gull to protect them from predation has led to higher nest success. The maincauses of poor breeding performance appear to be predation by foxes and brown rats and insufficient foodavailability for the young