Contemporary science is preoccupied with that which exists; it rarely accounts for what is missing. But often the key to a system’s persistence lies with information concerning lacunae. In…Full description
basic ecological concepts 1
Draft of 11/21/03 By Robert G. Bailey, USDA Forest Service, Inventory & Monitoring Institute Ecological Climate Classification
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Secret power of PyramidsFull description
This presentation was prepared for my Grade 11 Students. (this is not the final version). It covered some aspects of section E of 2004 Syllabus content.Full description
Ecological truth PROCEEDINGS-Scientific and Pofessional Conference on natural resourses and enviromental protection
piramids science
Pyramids of Giza Lesson
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Mark Lehner brings his many years of field research in Egypt to this definitive book. He examines the pyramids in unprecedented detail, covering the practical aspects―the quarries, ramps, an…Deskripsi lengkap
Looking into the ancient pyramids and discover for yourself see hidden secrets of the pyramids and how to tap it.Full description
Mark Lehner brings his many years of field research in Egypt to this definitive book. He examines the pyramids in unprecedented detail, covering the practical aspects―the quarries, ramps, and tools...Full description
Mark Lehner brings his many years of field research in Egypt to this definitive book. He examines the pyramids in unprecedented detail, covering the practical aspects―the quarries, ramps, and tools...
Mark Lehner brings his many years of field research in Egypt to this definitive book. He examines the pyramids in unprecedented detail, covering the practical aspects―the quarries, ramps, an…Descrição completa
2011 Ecological Profile of Tagaytay City, PhilippinesFull description
human in their ecological settingFull description
Ecological Pyramids: Energy Pyramid from Silver Springs, FL. Energy always decreases, but biomass and numbers can vary in certain circumstances.
Biomass Pyramid - Biomass refers to the weight of each trophic level.
Pyramid of Numbers
When organisms feed, toxic and radioactive substances are magnified in the food chain, causing those organisms at higher trophic levels to receive higher doses of the substances. Many birds of prey became threatened by consuming DDT, which decreased calcium in the egg shell. As a result, eggs broke and populations decreased rapidly in hawks, owls, eagles, pelicans, etc.
The exchange and flow of energy within an ecosystem is dependent upon the communities and species occupying that ecosystem, and is connected to various nutrient cycles, as shown in the next few illustrations.
Material cycling in the environment. The Carbon cycle. Any disruption in any of the nutrients can have major effects on the environment. Oil, gas, peat, and coal are formed from dead organisms over periods of millions of years. Most of these substances were formed from organisms that lived in the Carboniferous Period (over 300 million years ago). Therefore, these are not renewable resources; once gone, they cannot be replaced.
