Biotic/Abiotic factors Carrying capacity Techniques of Field Ecology

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Presentation transcript:

Biotic/Abiotic factors Carrying capacity Techniques of Field Ecology Unit 2 Ecology Biotic/Abiotic factors Carrying capacity Techniques of Field Ecology

Environments & Ecosystems What is the relationship between the environment and an ecosystem? The environmental factors that affect ecosystems: Biotic Abiotic

Can you identify the biotic and abiotic factors in this ecosystem?

Populations Can you write your own definition for the term population? Populations will grow if the ___________ rate exceeds the ________ rate. Populations ____________ grow indefinitely forever. Why?

Population Growth rates Factors that limit population growth are called limiting factors; they can be either biotic or abiotic factors Examples of limiting factors - predators - food - reproductive mates - weather

Graph of population growth 2. What is part A of the graph? 1. What is going on in this part of the graph?

Counting the size of Populations Is not easy! Often the populations are inaccessible to humans Ecologists try to determine population sizes in order to assess species diversity and to predict changes over time Ecologists use several different methods to count population sizes in the field Capture & release Random sampling Quadrant studies

Capture & release

Quadrant sampling It would be practically impossible to count every organism in the entire area

Random sampling Scientists take samples from various accessible places to get an estimate of population size

Analysis of populations over time