Year-end Sale % OFF 
Abstract
This paper presents the results of observations on the state of two bird species populations listed in the Red Book of the Russian Federation Recurvirostra avosetta L., Larus ichthyaetus Pall. The populations of these species in the State Natural Reserve Tryochozyorki Tract have been studied by the authors for 8 years. The wetland is a key ornithological area of international importance. The paper presents information obtained in 2020, which has been compared with the information received in 20132018 which was published. For R. avosetta L. the maximum number of breeding pairs (127) and the maximum value of the average clutch size (3,6) were noted for the entire observation period. The reproduction of R. avosetta L. started earlier than in previous years. For L. ichthyaetus L. a relatively high number (no less than 280300 pairs) and also the maximum value of the clutch size (3,0) were noted, the breeding time of the species turned out to be typical for this territory. The analysis showed a favorable state of the populations of these species. The previously stated assumption about the relationship of the studied indicators of the nesting biology of these species with the level of water content of the territory was further confirmed.
Highlights
Введение Recurvirostra avosetta L. и Larus ichthyaetus Pall. – виды птиц, занесённые в Красную книгу Российской Федерации [1] и Республики Хакасия [2]
В 2015 году уровень был максимально низким, все острова соединились с берегами, акватория уменьшилась на 80%
Для L. ichthyaetus отмечена сравнительно высокая численность и максимальный размер кладки
Summary
Введение Recurvirostra avosetta L. и Larus ichthyaetus Pall. – виды птиц, занесённые в Красную книгу Российской Федерации [1] и Республики Хакасия [2]. Урочище – одно из немногих мест гнездования R. avosetta и единственное место гнездования L. ichthyaetus в Южно-Минусинской котловине. Рассматриваются: сроки гнездования, число гнездящихся пар, размер кладки и яиц в 2020 году, в сравнении с предыдущими годами, с позиций влияния абиотических факторов. Отсутствие гнездования наблюдали в годы как с низким (2015, 2017), так и с высоким (2017, 2019) уровнем воды. В урочище Трёхозёрки начало откладки яиц чаще наблюдали со второй пентады мая [15, с.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
