b iodiversity envirothon 2009. w hat is biodiversity the variation of life forms within a given...
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WHAT IS BIODIVERSITY
The variation of life forms within a given ecosystem, biome or for the entire Earth. Biodiversity is often used as a measure of the health of biological systems.En.wikipedia.org/wiki/Biodiversity
The variety of different species, the genetic variability of each species, and the variety of different ecosystems that they form.www.ec.gc.ca/water/en/info/gloss/e_gloss.htm
Is the variety of all life forms, the different plants and animals and micro-organisms, the genes they contain and the ecosystems of which they form part.www.glenelg-hopkins.vic.gov.au/
DEFINE:
the number of different species found in an environment
the variety of genes within a breeding population
Species Biodiversity
Genetic Biodiversity
Ecosystem Biodiversity
refers to the diversity of a particular ecosystem or natural unit consisting of all plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors of the environment.
EXAMPLES OF BENEFITS OF BIODIVERSITYBIOLOGICAL RESOURCES
Food for humans and other organismsMedical and pharmaceutical resourcesBreeding populations (crops, biological resources)
ECOSYSTEM SERVICESProtection of water resourcesProtection of soilNutrient recycling and storagePollution controlClimate stability
SOCIAL BENEFITSRecreation and tourismResearch and educationCultural valueAesthetics
SoilsSoil is by far the most biologically diverse part of Earth. The soil food web includes beetles, springtails, mites, worms, spiders, ants, nematodes, fungi, bacteria, and other organisms. These organisms improve the entry and storage of water, resistance to erosion, plant nutrition, and break down of organic matter. A wide variety of organisms provides checks and balances to the soil food web through population control, mobility, and survival.
ForestryForest biological diversity is a broad term that refers to all the life forms found within forested areas and the ecological roles they perform.
WildlifeThe term “wildlife” refers to all non-domesticated animals. It thus singles out one component of biodiversity. Changes in biodiversity can directly affect wildlife.
AquaticsAquatic biodiversity can be defined as the variety of life and the ecosystems that make up the freshwater, tidal, and marine regions of the world and their interactions. Aquatic biodiversity encompasses freshwater ecosystems and marine ecosystems,
BIODIVERSITY RELATED TO SOILS, FORESTRY, WILDLIFE AND AQUATICS
FACTS ABOUT BIODIVERSITY
1.7 million different species of organisms have been identified on Earth today. There is an estimate that maybe there are 10- 100 million species on Earth.
More than 7000 species of plants are cultivated or harvested from the wild.
Medicines - 118 of the top 150 prescription drugs in America contain chemicals derived from plants, fungi and other species.
BIODIVERSITY LOSS AND SOLUTIONS
Deforestation Lack of Good Land
Conservation Techniques Habitat Alteration Fragmentation of Forests
and Ecosystems Overpopulation by Humans Poor Policies by
Governments Imported Goods Global Climate Change Asteroid Impacts
Causes for
Biodiversity Loss
Solutions to
Solving the Losses
Reforestation Conservation Education Legislation Incentive Programs
to Encourage Conservation
Plant Natives Buy Locally
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Examples of Nature’s Affect on Biodiversity
Wildfires
Too Much Rain
Drought
Extreme Cold
Extreme Hot
Volcanoes
Sea Level Rise
Glaciation
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Examples of Humans Negative Affects on Biodiversity:
Building Dams
Oil Spills
Cutting Forests
Pollutants
BAYOUS AND STREAMS RELATED TO BIODIVERSITY?
Freshwater resources include lakes and ponds, rivers and streams, reservoirs, wetlands, and groundwater. These habitats provide the resource of freshwater and homes to a host of organisms.
The rates of extinction of freshwater species and the number of endangered freshwater species are alarming. For example, 21 out of 822 native American fish species have become extinct.
BIODIVERSITY AND HUMAN FOOD SUPPLY AND NUTRITION
Since agriculture began 12,000 years ago, approximately 7000 plant species and several thousand animal species have been used for human food.
Even today world hunger is an issue
Biodiversity contributes directly to food security, nutrition and well-being by providing a variety of plant and animal foods from domesticated and wild sources.
Food Supply Nutrition
Eating a variety of foods provides the human body with important essential nutrients.
Biodiversity can also serve as a safety-net to vulnerable households during times of crisis, present income opportunities to the rural poor, and sustain productive agricultural ecosystems.
GEO
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The first, 450 million years ago, occurred shortly after the evolution of the first land-based plants and 100 million years after the Cambrian explosion of animal life beneath the seas.
The second extinction spasm came 350 million years ago, causing the formation of coal forests.
Then the Earth experienced two mass extinctions during the Triassic period, between 250 and 200 million years ago.
The fifth mass extinction, probably caused by a giant meteor collision, occurred 65 million years ago, at the end of the Cretaceous period, and ended the reptilian dominance of the Earth. This led to the current mammalian domination of the Earth.
MAJOR CHANGES IN BIODIVERSITY OVER TIME Five (5)
major extinctions in the 4 billion year historyof life on Earth.
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65 MYA – Asteroid Impact, Volcanoes, Change in Ecology (K-T Boundry)The end of the dinosaurs!!
200MYA Asteroid Impacts, VolcanoesChange in Ecology
250 MYA –THE GREAT EXTINCTIONEnvironmental Changes 96% of all marine70% of land vertebratesInsect extinction
350MYA – Cause UnclearOnly marine life lostPossible O2 loss in water
450MYA – 2nd Largest ExtinctionGlobal Temperature Drop
Beginning of Geologic Time.