The fate of the Common Pochard is discussed intensively in the relevant forums. Scientific research suggests that the sex ratio of the populations of Common Pochard (Aythya ferina), a medium-sized diving duck, in Europe and North Africa has changed. This could play a role in the decline of the species in the Western Palearctic.
Sex ratio results have just been published in the Wildfowl & Wetlands Trust (WWT) Journal Wildfowl. These conclusions show that populations are becoming increasingly “masculine”. Using the data obtained in January 2016, the researchers compared counts from surveys conducted in January 1989 and January 1990 in the same region. The proportion of men in the total population was 62% in the years 1989 to 1990 and in 2016 this disparity even increased to 71%.
Interesting clues for the pochard, a bird in a sharp population descent, provides an investigation of ZIMMERMANN, H. (2010), which was published in: Brut und Mauser der Tafelente Aythya ferina im Naturschutzgebiet Fischteiche in der Lewitz (Breeding and moulting of the pochard Aythya ferina in the nature reserve fish ponds in the Lewitz) in Orn. Newsletter Meckl.-Vorp. 46: 367-373.
The fish ponds in the Lewitz are a traditional breeding and moulting area of the Common Pochard in Mecklenburg-Vorpommern in Continue reading Pochard: a bird population in decline