Livestock in salt marshes help farmers and geese

If livestock are allowed to graze in salt marshes in the Wadden Sea area, the vegetation remains in a good condition for the hundreds of thousands of Brent Geese which forage there en route to Siberia. When such grazing does not take place on a large scale, the geese are likely to become more dependent on pastures. This is the conclusion reached by biologists from the University of Groningen in a Technology Foundation STW project.

Each spring about 200,000 Brent Geese depart from England and France to the Siberian tundra to breed. En route they descend on salt marshes and polders in the Wadden Sea area to eat young grass. Farmers noted that geese seemed to have a preference for grasslands with short vegetation. STW researchers at the University of Groningen havenow discoveredthe reasons for this. The ecologists measured the preference of the geese for small experimental areas. Some areas had little grass and others had much. Some areas contained a high protein level (a measure of the nutritional quality) and some a low level. The biologists studied the behaviour of the birds and counted the number of droppings on each trial area. From the droppings, the time spent by the geese in an area could be determined, as geese produce droppings at very regular intervals. The study revealed that geese prefer grass areas where the rate of protein ingestion is the highest.

That is the case for short grass, as in general this has a high protein level. Furthermore, Brent Geese find it easier to eat short grass than long grass. Grazing livestock can help to keep the grass short when its growth is particularly strong, as is the case in spring. If the geese are not chased away, they regularly return to the same area. By doing this they keep the grass short and thus maintain the quality of their own food. A policy in recent years of tolerating geese in certain agricultural areas along the Dutch Wadden Sea coast has therefore been favourable for the geese, as they prevent th

Contact: Michel Philippens
Netherlands Organization for Scientific Research

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