Limnology zoologist) and Einar Naumann (a Swedish botanist) co-founded the International Society of Limnology (SIL, from Societas Internationalis Limnologiae). Forel's original definition of limnology, "the oceanography of lakes", was expanded to encompass the study of all inland waters, and influenced Benedykt Dybowski's work on Lake Baikal. Prominent early American limnologists included G. Evelyn Hutchinson, Ed Deevey, E. A. Birge, and C. Juday. Physical properties of aquatic ecosystems are determined by a combination of heat, currents, waves and other seasonal distributions of environmental conditions. The morphometry of a body of water depends on the type of feature (such as a lake, river,
Association for the Study of Ethnicity and Nationalism to identify and develop a separate subject-area as a field of study in its own right, and unify the body of scholars in the field; [and] (3) to bring to the attention of the wider scholarly community, and the public, the need to treat the subject-area as a well-defined field of interdisciplinary study, which requires the collaboration of scholars from a variety of intellectual backgrounds." "Nations and Nationalism" has been selected to be indexed in the "Current Contents: Social & Behavioral Sciences Index" and the "Social Sciences Citation Index", but the impact factor has not yet been announced. Each spring,