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Chapter 19A - Ecology (Lecture)

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by

Jackie Looney

on 26 August 2016

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Transcript of Chapter 19A - Ecology (Lecture)

Chapter 19A - Ecology
Job 12:7-9 - But ask the animals, and they will teach you, or the birds of the air, and they will tell you; or speak to the earth, and it will teach you, or let the fish of the sea inform you. Which of all these does not know that the hand of the LORD has done this?
19.1 - The Nature of
Ecology
The study of how living and nonliving things affect one another
Not just the study of pollution or how man is destroying the environment.
The Role of Ecology
Ecologists are called to:
study relationships between existing organisms
predict outcomes if factors are changed
recommend changes to environment
Ecologist not always called to correct problems
Changes can be difficult and complex
People must make wise choices concerning the environment, but realistic Christian values must also be considered
19.2 - The
Ecosystem
Defined

All living things and nonliving things and their interactions within a limited area
Problems with limiting an ecosystem is that all ecosystems depend upon other ecosystems
Abiotic Factors
The nonliving aspects (the physical environment) of the ecosystem
Biotic Factors
All the living things in an ecosystem
Individual
Population
Community
Ecosystem
Biosphere
Smallest
Largest
Ecologists are interested in many characteristics of a population, such as total number,
density
, or arrangement
Populations interact with each other, whether positively or negatively
Producers
and
Consumers
Organisms that manufacture their own food
Organisms that consume other organisms for food
Responsible for primary productivity in an ecosystem
Food Chain
Nutritional relationship between organisms
Ecological Pyramids
and
Food Webs

A diagram that show quantitative relationships between
biomass
or quantity of organisms in an ecosystem (divided into
tropic levels
)
A method of illustrating multiple nutritional relationships/interactions between populations in an ecosystem
Another important aspect of an ecosystem is its

biodiversity
Species Interaction
Neutralism
Competition
Predation
Symbiosis
Amensalism
Parasitism
Commensalism
Mutualism
Survival Strategies
Camouflage
Warning
Coloration
Radiant energy from sunlight is only significant source of energy in most ecosystems.
~50% of total light energy available is absorbed by the plants (rest reflected or lost as heat)
Of absorbed light, ~2% (~1 total light energy) converted to sugar.
Of energy stored in sugar, ~50% used for plant metabolism
In short, out of all light energy available to plants, only ~0.5% is available to the first consumer
Decomposers
Dead organic matter (detritus) is the last step in a food chain/web; material must be broken down
Various organisms (detritivores/decomposers) are responsible for this very important step (bacteria, fungi, crustaceans, scavengers)
Leviticus 11:10-23
10-12 - unclean fish (no fins and scales)
13-19 - unclean birds (raptors)
20-23 - unclean insects (anything but locusts/crickets/grasshoppers)
Job 24:20 - “The womb shall forget him; the worm shall feed sweetly on him”
Mimicry
Full transcript