Selection by Brent Geese Branta bernicla for different leaf lengths of Aster tripolium on saltmarsh

Abstract

In early winter Brent Geese feeding on lower saltmarsh selected Aster tripolium leaves in the length classes 30-89 mm and especially 40-59 mm; i.e. in the mid-range of available sizes. Small leaves (mean size 25 mm) had proportionately more crude protein and water-soluble carbohydrates than large leaves (113 mm), and a lower ash, water and salt content. Thus, Brent Geese were not selecting the most nutritious leaves though they may have been selecting the mid-range to maximize the rate of intake of nutrients.