Egg size, weight and fresh egg density of the Scaly-sided Merganser Mergus squamatus in South Primorye, Russia

摘要

Egg biometrics data were collected in 2003-2007 in the core breeding area of the Scaly-sided Merganser Mergus squamatus in South Primorye, Russia. Mean egg length was 62.5 mm (s.e. +/- 0.1 mm) and mean maximum diameter was 44.7 mm (+/- 0.1). Data on fresh egg weight and density for the Scaly-sided Merganser are published for the first time; fresh egg weight was 70.7 g ( +/- 0.9) and density was 0.56 g/cc (+/- 0.002). The mass of a full clutch equates to similar to 76.7% of the females body mass before egg laying, and all average Scaly-sided Merganser egg weighs similar to 7.2% of the female's body mass before egg-laying.