Charles S. Elton (29 March 1900 – 1 May 1991) was an English zoologist and animal ecologist. In 1927, Elton published his classic Animal Ecology, outlining the principles behind ecological studies of animal behavior and life history, such as food chains, size of food items, ecological niche, and the concept of a pyramid of numbers to represent the structure of an ecosystem in terms of feeding relationships. There he also introduced ideas such as the food cycle, the connection between various parts of the ecosystem, and the concept of food pyramid and trophic levels. He also discussed how ecosystems are organized and ordered, in what later became the foundation of the ecosystem concept. 

Flora and Fauna (are umbrella terms that refer to many different types of life. What is counted as flora and fauna is dependent upon the specific region, climate, or time period. A region might be a specific habitat or biome like grasslands or savannas. For this reason, what classifies as a particular group of flora or fauna can be up for debate depending upon how groups of scientists classify a time period or region)

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Growth in ecology: Population ecology is the study of how populations — of plants, animals, and other organisms — change over time and space and interact with their environment. ... growth: how the size of the population is changing over time.

Habitat (the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical manifestation of its ecological niche. Thus, habitat is a species-specific term, fundamentally different from concepts such as environment or vegetation assemblages, for which the term habitat-type is more appropriate)

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the Inner-shelf of the Great Barrier Reef, Australia.

Journal of Ecosystem and Ecography (is an international open access journal publishing the quality peer-reviewed research articles relevant to the field of Environmental Sciences. It aims to publish those papers that are most influential in their fields or across fields; that will significantly advance scientific understanding. The journal selects the articles to be published with a single bind, peer review system, following the practices of good scholarly journals. It supports the open access policy of making scientific research accessible to one and all)

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Kangaroos form an integral part of our natural ecosystems, playing an important role in promoting regeneration of native plants and reducing the fuel load in forests and grasslands. Kangaroos and wallabies belong to the 'super-family' macropodidae (from the Greek word for 'large foot').

Lord Howe Island (is considered to be an outstanding example of an island ecosystem developed from submarine volcanic activity. The island’s isolation and its varied landscape of mountains, valleys, hills, lowlands and sea-cliffs have resulted in a diverse array of habitat types supporting many distinctive flora and fauna groups)

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Ecosystem management is an approach to ecosystem maintenance and restoration that aims to promote the long-term sustainability of ecosystem functioning and thus, meet socioeconomic, political, and cultural needs by ensuring the persistence of ecosystem services. Building upon traditional natural resource management approaches, ecosystem management, which integrates ecological, socioeconomic, and institutional priorities, is a holistic, adaptive method for evaluating and achieving ecosystem resilience and sustainability.

Natural Capital (is the world's stock of natural resources, which includes geology, soils, air, water and all living organisms. Some natural capital assets provide people with free goods and services, often called ecosystem services. Two of these (clean water and fertile soil) underpin our economy and society, and thus make human life possible)