Contemporary textbooks in ecology incorporate the terms and language which have been developed through the competing and often seemingly incompatible conceptual bases. Advocates of the prevailing trend in ecology which has been dubbed as the evolutionary ecology, have been criticising the major premises and concepts of the old-fashioned ecosystem ecology. Yet they can not but adopt concepts and premises of the ecosystem ecology when they have to handle concrete problems in ecology. It is particularly noticeable in handling the practical issues at the textbook of environmental sciences, but the same tendency could be seen from most of the general textbooks in ecology. The obvious reason is the usefulness of those concepts and methods developed from different disciplinary bases developed for different purposes. The incompatibility between premises and assumptions in evolutionary biology and ecology has been noticed from the inception of the ecology as a discipline, yet significant conflicts between the evolutionary viewpoints and functional viewpoints in ecology started from the early 1970s. Nevertheless, in spite of the diverse opinions on the nature of ecology, the practitioners of ecology in general seem to be rather liberally using the conceptual and methodological tools borrowed from the evolutionary ecology, ecosystem ecology, population ecology, and the community ecology. Through a brief historical reflections on the rather puzzling diversities in ecological perspectives on nature, I was led to a conclusion that the methodological pluralism and conceptual diversity do not necessarily mean unfavorable fragmentation of the discipline. Methodological and conceptual diversity in ecology could mean equipping adequate instruments to grasp the many faces of ecological scopes, and to describe the multi-faceted layers of nature. Indeed, the diversity could be a sign of health rather than a sign of crisis in ecology.