The academic structure for ecology, as a new
science was established by geographers. The prominence of the
discipline of geography in the nineteenth century, its
contributions to other sciences, and its widespread interest for
the general reader are seldom appreciated today. But geography in
that period was a powerful cultural force; Humboldt, Lyell, and
Darwin are only the most famous of its students. Strictly speaking,
however, it was an aberrant group among geographers who first
attempted to describe the topography of living things.
Throughout most of the nineteenth century, as
today, the most familiar school of biogeography was the study of
flora and fauna. Essentially this was a matter of compiling
statistical data on the distribution of species around the world
and then deriving from such data a system for classifying
geographic regions. The floristic geographer was bound to be
interested in the adaptations of organisms to their environments, a
process that Haeckel included in the territory of ecology. But this
interest was limited; the controlling purpose of the dominant
school was taxonomic more than ecological. To reverse this order of
priorities was precisely the intention of the lesser-known, rival
school, which was at first known as "physiognomic," then
"physiological," and finally as "ecological" geography. This school
preferred to talk about the forms of "vegetation" and their
determinants rather than about the distribution of the earth's
plant species.
The variety of life is an expression of
geography. Geographical ranges of species vary in size from a few
square metres to almost the entire globe. Geographical boundaries,
beween species are determined by the local solar economy and the
planetary economy; i.e. effects of climate and seasons and the
effects of geomorphological events in Earth's history.
These two economies of material energy define
local biogeographical systems which determine the evolution
of species and the diversity of
communities.
Biodiversity is now declining through the impact
of human activities. 'Conservation' is the local
response to preserve and enhance geographical variety amongst
living things.