The scope of ecology  (Page 19/2)

Introduction

"Ecology is the entire science of the relations of the organism to the surrounding exterior world, to which relations we can count on the broader sense all of the conditions of existence. These are partly of organic, partly of inorganic nature... It is the "household' of nature."

Ecology is the study of the interactions of living organisms with their environment. The Greek root of the word, and the basis for Haeckel's analogy above, is οἶκος (oikos), which means house or dwelling-place. Ecology simply means "knowledge of the house". One core goal of ecology is to understand the distribution and abundance of living things in the physical environment. Attainment of this goal requires the integration of scientific disciplines inside and outside of biology, such as biochemistry, physiology, evolution, biodiversity, molecular biology, geology, and climatology. Some ecological research also applies aspects of chemistry and physics, and it frequently uses mathematical models.

Levels of ecological study

When a discipline such as biology is studied, it is often helpful to subdivide it into smaller, related areas. For instance, cell biologists interested in cell signaling need to understand the chemistry of the signaling molecules (which can be sugars, proteins, lipids, gases, or other compounds), as well as the result of cell signaling. Ecologists interested in the factors that influence the survival of an endangered species might use mathematical models to predict how current conservation efforts affect endangered organisms. To produce a sound set of management options, a conservation biologist needs to collect accurate data, including current population size, factors affecting reproduction (like physiology and behavior), habitat requirements (such as plants and soils), and potential human influences on the endangered population and its habitat (which might be derived through studies in sociology and urban ecology). Within the discipline of ecology, researchers work at four specific levels, sometimes discretely and sometimes with overlap: organism, population, community, and ecosystem ( [link] ).

Organismal ecology

Researchers studying ecology at the organismal level are interested in the adaptations that enable individuals to live in specific habitats. These adaptations can be morphological, physiological, and behavioral. For instance, the Karner blue butterfly ( Lycaeides melissa samuelis ) ( [link] ) is considered a specialist because the females preferentially oviposit (that is, lay eggs) on wild lupine. This preferential adaptation means that the Karner blue butterfly is highly dependent on the presence of wild lupine plants for its continued survival.