Biodiversity and Evolution

 

BIODIVERSITY AND EVOLUTION

 

In this module, expected to: you are 1. Relate species extinction to the failure of populations of organisms to adapt to abrupt changes in the environment,  Explain the importance of biological diversity. Find out how changes in the environment can affect species extinction.  Distinguish environmental changes that 

may result in the loss of the species.

 

2. Make a multimedia presentation of a timeline of extinction of representative microorganisms, plants, and animals

 

Key Questions: 1. What causes species extinction? 2. How can changes in the environment affect the continued survival of the species?

 

Park reserve in Calauit, Palawan

 

Activity 1 Index of Diversity Objective: 1. Measure species distribution using mathematical way of expressing the amount of biodiversity and species distribution in a community. 

 

Guide Questions: 1.

Compare how your tree I.D. would be different in a vacant lot than that in a grass lawn . Explain your answer

2. If humans were concerned about biological diversity, would it best to have a low or high I.D. for a particular environment? Explain your answer.

 

PopulationPertains to the number of organisms of the same species living in a certain place.

 

Biodiversity refers to the variety of life in an area.

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Communities with many different species (a high index of diversity) will be

able to withstand environmentall changes environmenta better than communitie communitiess with only a few species (a low index of diversity).

 

Activity 2 Measuring Population Density Objective:  Determine the pattern of population distribution using mathematical formula Compare the distribution patterns of the different populations.

 

Bermuda grass clover

Lilies

 

Density = number of individuals Size of area Population name

Number of organism

BERMUDA

55

CLOVER

14

LILIES

19

Example Exam ple : Density Density of bermu bermuda da = 55 360

Density

 

Guide Questions: Compare the distribution patterns of the three populations. 2. Which population has the greatest density?_____________________   __ 1.

 

3. Infer from recorded data from the possible causes for the differences in the population density. 4. What conditions could change the density of any of the population? 5. Describe how a population’s density can be used to learn about the needs and characteristics of that population.

 

Populations •

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can be of the same size, but they may have different densities Population sizes change when new members move into the ecosystem. Decreases when member move out of the ecosystem. Death rate and birth rate can also affect a population size.

 

Limiting Factors Anything that limits the size of a population, example is environmental environmen tal factors. It keep a population from increasing in size and help balance an ecosystem.

 

Limiting Factors 1.

Availability of food

2.

Water Light Temperature Soil nutrients

3. 4. 5.

 

Carrying capacity The maximum population size the an environment can support.