<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Between 2002 and 2019, monitoring of Common Tern <italic>Sterna hirundo</italic> and Little Tern <italic>Sternula albifrons</italic> along the Sava River near Zagreb, Croatia was conducted. Natura 2000 site “Sava kod Hrušćice” was designated to protect colony at river islands, with estimated population sizes of 100–150 pairs of Common and 20 pairs of the Little Tern. Flooding of the colony caused breeding failure in several years. Common Terns moved to breed on islands in gravel pits with a total population around 150 pairs, while Little Tern did not breed after 2010. In the last few years, terns have not bred at Hrušćica and the only colony inside the Natura 2000 site is situated on a breeding platform at Siromaja gravel pit. Channelling of rivers and hydropower plants are the main threats, changing natural dynamics of water level and causing reduction of gravel sediment in rivers.</p></abstract>

Between 2002 and 2019, monitoring of Common Tern Sterna hirundo and Little Tern Sternula albifrons along the Sava River near Zagreb, Croatia was conducted. Natura 2000 site “Sava kod Hrušćice” was designated to protect colony at river islands, with estimated population sizes of 100–150 pairs of Common and 20 pairs of the Little Tern. Flooding of the colony caused breeding failure in several years. Common Terns moved to breed on islands in gravel pits with a total population around 150 pairs, while Little Tern did not breed after 2010. In the last few years, terns have not bred at Hrušćica and the only colony inside the Natura 2000 site is situated on a breeding platform at Siromaja gravel pit. Channelling of rivers and hydropower plants are the main threats, changing natural dynamics of water level and causing reduction of gravel sediment in rivers.

Dynamics of Common <italic>Sterna hirundo</italic> and Little Tern <italic>Sternula albifrons</italic> populations along the Sava River in North-western Croatia between 2002 and 2019

Acrocephalus

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Dynamics of Common  and Little Tern  populations along the Sava River in North-western Croatia between 2002 and 2019

Between 2002 and 2019, monitoring of Common Tern Sterna hirundo and Little Tern Sternula albifrons along the Sava River near Zagreb, Croatia was conducted....

Dynamics of Common Sterna hirundo and Little Tern Sternula albifrons populations along the Sava River in North-western Croatia between 2002 and 2019

Published Online: Apr 03, 2020

Page range: 49 - 54

Received: Sep 06, 2019

Accepted: Oct 14, 2019

DOI: https://doi.org/10.1515/acro-2019-0002

Keywords
Common Tern, Little Tern, Sava River, monitoring, Natura 2000 site, threats

© 2019 Jelena Kralj et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Dynamics of Common Sterna hirundo and Little Tern Sternula albifrons populations along the Sava River in North-western Croatia between 2002 and 2019

Published Online: Apr 03, 2020

Page range: 49 - 54

Received: Sep 06, 2019

Accepted: Oct 14, 2019

DOI: https://doi.org/10.1515/acro-2019-0002

KeywordsCommon Tern, Little Tern, Sava River, monitoring, Natura 2000 site, threats

© 2019 Jelena Kralj et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Common Tern, Little Tern, Sava River, monitoring, Natura 2000 site, threats