An acceptable starting point for any discussion about the importance of food for birds is the work of Lack (1954). He maintained that they are limited by their food. A great deal of work has since been directed towards testing this hypothesis, and today most would accept that Lack was right — about carnivorous birds. The problems arise with herbivorous birds. Many would not accept that they are limited by their food. One of the reasons for this has been that most studies look only at the quantity of food, with no thought for its quality, and consider only the energy needs of the animals.
KeywordsSalt Marsh Successful Breeding Soluble Nitrogen Territorial Behaviour Black Grouse
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