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Powerpoint Presentation: Ecology
Powerpoint Presentation: Biosphere and Biomes
Powerpoint Presentation: Energy Flow

 

Ecology Index

The Competitive Exclusion Principle
Ecological Succession: Lake - Woodland Transition
Populations and Sampling
Modelling Population Growth
Biodiversity and conservation
What can be done to stop the loss of biodiversity?
Conservation Alternatives
The Carbon Cycle
The Nitrogen Cycle Flow Chart
The Nitrogen Cycle
Eutrophication
Methanogens and Biogas

Topic Chapters Index

 

The Biosphere

The part of the planet Earth occupied by living organisms. Where they interact with themselves and the non-living parts of the plant to maintain the biogeochemical cycles (e.g. carbon cycle).

Arguably from 10 km altitude (the limit of the troposphere) to 3 km below sea level (the deepest ocean trench). Bacteria have even been found living in oil deposits several km down in solid rock.

 

ECOLOGY

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Introduction

 

Ecology

The study of living organisms in the natural environment. How they interact with one another and how the interact with their nonliving environment.

Ecosystem

Community + Abiotic environment, interacting

Community

All the populations of the different species living and interacting in the same ecosystem.

Species

A group of organisms that can breed to produce fully fertile offspring.

Populations

A group of organism of the same species which live in the same habitat at the same time where they can freely interbreed.

Biodiversity

The total number of different species in an ecosystem and their relative abundance.

Habitat

The characteristics of the type environment where an organism normally lives. (e.g. a stony stream, a deciduous temperate woodland, Bavarian beer mats).

 

Energy and organisms

 

Autotrophs

Organisms which can synthesise their own complex, energy rich, organic molecules from simple inorganic molecules (e.g. green plants synthesis sugars from CO2 and H2O)

Heterotrophs

Organisms who must obtain complex, energy rich, organic compounds form the bodies of other organisms (dead or alive).

Detritivores

Heterotrophic organisms who ingest dead organic matter. (e.g. earthworms, woodlice, millipedes)

Saprotrophs

Heterotrophic organisms who secrete digestive enzymes onto dead organism matter and absorb the digested material. (e.g. fungi, bacteria)

 

The place of an organism in its environment

Niche = Habitat + role + tolerance limits to all limiting factors

 

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