Численность птиц в шесть раз превышает население Земли

В мире насчитывается 50 миллиардов различных видов птиц. Это около шести птиц на человека, из расчета популяции населения Земли. Такие данные приводятся в отчете о новом исследовании  Университета Нового Южного Уэльса (UNSW Sydney).

Больше всего, по подсчетам ученых, на земле домовых воробьёв – 1,6 миллиардов особей. Много еще и скворцов – 1,3 миллиарда. Кольчатых чаек – 1,2 миллиарда и ласточек – 1,1 миллиардов. Эти четыре вида птиц относятся к так называемому «клубу миллиарда» — это виды с наиболее глобальной популяцией.

«Удивительно, что лишь несколько видов доминируют в общем количестве отдельных птиц в мире», — отмечает ведущий автор исследования доктор Кори Каллаган.

На фоне «клуба миллиарда» очень скромно выглядят около 12 процентов птиц, которые имеют популяцию менее 5 тысяч особей. К ним относятся китайская хохлатая крачка, шумная птица-кустарник и невидимый рельс  (поручень Уоллеса).

Останутся ли эти виды – ученые выяснят через 10 лет, когда проведут повторное исследование.

«Если численность их населения сокращается, это может стать настоящим сигналом тревоги для здоровья нашей экосистемы», — отметил доцент Уилл Корнуэлл, эколог UNSW Science и соавтор исследования.

Основой для исследования ученых стали наблюдения 600 тысяч орнитологов, которые внесли свои изменения в набор данных eBird в период с 2010 по 2019 год. Впоследствии орнитологическая лаборатория Корнелла, которая управляет сайтом eBird, предоставила данные в свободный доступ.



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