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In an ecosystem, which of the following processes primarily contributes to the conversion of inorganic compounds into organic matter?
In an ecosystem, which of the following processes primarily contributes to the conversion of inorganic compounds into organic matter?
What role do decomposers play in an ecosystem's nutrient cycle?
What role do decomposers play in an ecosystem's nutrient cycle?
Considering the flow of energy in an ecosystem, what is the primary distinction between autotrophs and heterotrophs?
Considering the flow of energy in an ecosystem, what is the primary distinction between autotrophs and heterotrophs?
How does chemosynthesis differ from photosynthesis in terms of energy source?
How does chemosynthesis differ from photosynthesis in terms of energy source?
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Which of the following statements accurately describes the relationship between producers, consumers, and decomposers in an ecosystem?
Which of the following statements accurately describes the relationship between producers, consumers, and decomposers in an ecosystem?
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Which step of the hypothetico-deductive method involves conducting repeated trials to ensure reliability and validity?
Which step of the hypothetico-deductive method involves conducting repeated trials to ensure reliability and validity?
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An ecologist is studying how a group of deer interact with each other and their environment. Which level of ecological organization is the ecologist primarily focused on?
An ecologist is studying how a group of deer interact with each other and their environment. Which level of ecological organization is the ecologist primarily focused on?
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Which of the following best describes the relationship between a community and an ecosystem?
Which of the following best describes the relationship between a community and an ecosystem?
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Considering the levels of organization of matter, which sequence represents a progression from simpler to more complex?
Considering the levels of organization of matter, which sequence represents a progression from simpler to more complex?
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A scientist observes that a certain species of fish only reproduces asexually. What can be inferred about this species based on this information?
A scientist observes that a certain species of fish only reproduces asexually. What can be inferred about this species based on this information?
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Which of the following scenarios best illustrates the ecological principle of interdependence?
Which of the following scenarios best illustrates the ecological principle of interdependence?
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How might the concept of 'finiteness of resources' directly influence the carrying capacity of a population within an ecosystem?
How might the concept of 'finiteness of resources' directly influence the carrying capacity of a population within an ecosystem?
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How does autecology differ from synecology?
How does autecology differ from synecology?
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A scientist observes that a specific plant species thrives only in soils with a pH between 6.0 and 7.5. This range represents the plant's:
A scientist observes that a specific plant species thrives only in soils with a pH between 6.0 and 7.5. This range represents the plant's:
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If a researcher is investigating how different species of plants compete for sunlight in a forest, which field of ecology is this research most aligned with?
If a researcher is investigating how different species of plants compete for sunlight in a forest, which field of ecology is this research most aligned with?
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A scientist is studying how the color of a moth's wings affects its survival rate in different environments. They are specifically interested in how natural selection pressures lead to changes in the moth population over time. Which field of ecology does this scenario align with?
A scientist is studying how the color of a moth's wings affects its survival rate in different environments. They are specifically interested in how natural selection pressures lead to changes in the moth population over time. Which field of ecology does this scenario align with?
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In which of the soil horizons would you expect to find the highest concentration of organic material?
In which of the soil horizons would you expect to find the highest concentration of organic material?
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A new housing development clears a large area of forest. According to ecological principles, what is the most likely long-term consequence regarding the 'balance of nature'?
A new housing development clears a large area of forest. According to ecological principles, what is the most likely long-term consequence regarding the 'balance of nature'?
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Which of the following scenarios best illustrates the impact of 'time' as an abiotic factor on an ecosystem?
Which of the following scenarios best illustrates the impact of 'time' as an abiotic factor on an ecosystem?
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How does wind, as an abiotic factor, MOST directly influence the rate of transpiration in plants and evaporation in animals?
How does wind, as an abiotic factor, MOST directly influence the rate of transpiration in plants and evaporation in animals?
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Which of the following scenarios exemplifies the principle that 'everything goes someplace' in an ecosystem?
Which of the following scenarios exemplifies the principle that 'everything goes someplace' in an ecosystem?
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Which of the following is MOST likely to be a limiting factor for primary productivity in a deep freshwater lake?
Which of the following is MOST likely to be a limiting factor for primary productivity in a deep freshwater lake?
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A severe drought drastically reduces the water availability in both a terrestrial forest and a nearby freshwater ecosystem. Which of the following correctly identifies the primary limiting factors impacted in each ecosystem due to the drought?
A severe drought drastically reduces the water availability in both a terrestrial forest and a nearby freshwater ecosystem. Which of the following correctly identifies the primary limiting factors impacted in each ecosystem due to the drought?
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Which of the following best describes the role of decomposers in an ecosystem?
Which of the following best describes the role of decomposers in an ecosystem?
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What is the primary distinction between detritivores and decomposers in their ecological roles?
What is the primary distinction between detritivores and decomposers in their ecological roles?
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How might a significant change in ambient temperature affect the rate of decomposition in an ecosystem?
How might a significant change in ambient temperature affect the rate of decomposition in an ecosystem?
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An organism functions best at its optimum temperature. If the environmental temperature fluctuates far beyond this optimum, what is the least likely consequence for the organism?
An organism functions best at its optimum temperature. If the environmental temperature fluctuates far beyond this optimum, what is the least likely consequence for the organism?
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How do poikilotherms primarily regulate their body temperature?
How do poikilotherms primarily regulate their body temperature?
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A lizard is observed moving between sunny and shady spots throughout the day. This behavior is most likely a strategy for:
A lizard is observed moving between sunny and shady spots throughout the day. This behavior is most likely a strategy for:
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Consider an animal species that can maintain a stable internal body temperature across a wide range of environmental conditions. Which of the following is the most likely characteristic of this species?
Consider an animal species that can maintain a stable internal body temperature across a wide range of environmental conditions. Which of the following is the most likely characteristic of this species?
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How does the process described by the overall reaction $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$ relate to the role of detritivores and decomposers in an ecosystem?
How does the process described by the overall reaction $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O$ relate to the role of detritivores and decomposers in an ecosystem?
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Which of the following explains how plants in cold environments avoid frostbite?
Which of the following explains how plants in cold environments avoid frostbite?
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How do camels adapt to arid conditions to conserve water?
How do camels adapt to arid conditions to conserve water?
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What is the most significant role of light as an abiotic component in an ecosystem?
What is the most significant role of light as an abiotic component in an ecosystem?
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How does the depletion of the ozone layer primarily affect living organisms?
How does the depletion of the ozone layer primarily affect living organisms?
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Which characteristic of soil is most affected by the amount of rainfall and the slope of the land?
Which characteristic of soil is most affected by the amount of rainfall and the slope of the land?
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How does 'soil structure' contribute to plant growth?
How does 'soil structure' contribute to plant growth?
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What role do chlorofluorocarbons (CFCs) and nitrogen oxides (NO) play in the environment?
What role do chlorofluorocarbons (CFCs) and nitrogen oxides (NO) play in the environment?
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What is 'physiological drought' in the context of plants in cold environments?
What is 'physiological drought' in the context of plants in cold environments?
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Flashcards
Behavioral Ecology
Behavioral Ecology
The study of the role of imprinting and instinct in social interactions among animals.
Law of Interdependence
Law of Interdependence
Everything in nature is connected and affects everything else.
Ernst Haeckel
Ernst Haeckel
Coined the term 'Ecology' from the Greek word 'oikos' in 1869.
Abiotic Components
Abiotic Components
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Natural Selection
Natural Selection
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Electron Transport
Electron Transport
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Detritivores
Detritivores
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Decomposers
Decomposers
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Homeotherms
Homeotherms
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Poikilotherms
Poikilotherms
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Heterotherms
Heterotherms
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Optimum Temperature
Optimum Temperature
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Producers
Producers
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Autotrophs
Autotrophs
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Photosynthesis
Photosynthesis
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Consumers
Consumers
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Scientific Method
Scientific Method
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Hypothetico-Deductive Method
Hypothetico-Deductive Method
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Levels of Organization of Matter
Levels of Organization of Matter
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Ecology
Ecology
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Autecology
Autecology
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Synecology
Synecology
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Population Ecology
Population Ecology
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Chemical Ecology
Chemical Ecology
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Soil Horizon O
Soil Horizon O
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Soil Horizon A
Soil Horizon A
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Wind's Role in Ecosystems
Wind's Role in Ecosystems
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Time in Ecosystems
Time in Ecosystems
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Limiting Factors in Terrestrial Ecosystems
Limiting Factors in Terrestrial Ecosystems
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Frostbite
Frostbite
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Physiological Drought
Physiological Drought
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Xerophytes
Xerophytes
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Hydrophytes
Hydrophytes
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Halophytes
Halophytes
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Shade Tolerance
Shade Tolerance
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Photoperiodism
Photoperiodism
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Soil Texture
Soil Texture
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Study Notes
Introduction to Ecology: Ecosystems Components
- All things originate from the earth and return to it—Menander
What is Science?
- Science is the process of gaining knowledge and investigating by making observations, posing questions, and testing through experimentation.
Scientific Method
- Hypothetico-deductive method
- Steps:
- Observation (direct or indirect)
- Problem definition (within the domain of science; not a "Why?" question)
- Hypothesis formulation (temporary explanation)
- Experimentation/data gathering (a series of experiments)
- Theory formulation (not speculation)
Ecology and Levels of Organization of Matter
- Ecology (from Greek oikos, meaning home) is the study of how organisms interact with one another and their non-living environment (biotic and abiotic components).
- Studies natural connections in air, water, and soil.
- Matter organization:
- Subatomic particles → Atoms → Molecules → Protoplasm → Cells → Tissues → Organs → Organ Systems → Organisms → Populations → Communities → Ecosystems → Biosphere → Planet (Earth) → Solar System → Galaxy → Universe
Ecosystem Organization
- Organism: Composed of cells.
- Eukaryotic vs. Prokaryotic
- Species: Groups of organisms similar in appearance, behavior, and genetics.
- Sexual vs. Asexual reproduction
- 1.5 million named species; likely 10-14 million more.
- Populations: Groups of individuals of the same species.
- Communities: Groups of different populations.
- Ecosystems: Communities of organisms and their environment.
- Biosphere: All ecosystems on Earth.
Subdivisions of Ecology
- Autecology: Study of individual organism life histories and behaviors adapting to environmental conditions.
- Synecology: Study of groups of organisms interacting as a unit.
Fields of Ecology
- Population Ecology: Study of population growth and fluctuations.
- Chemical Ecology: Study of chemical use in animal recognition, trail-making, courtship, and defense.
- Physiological Ecology: Study of individual organism responses to temperature, moisture, light, and environmental factors.
- Evolutionary Ecology: Study of natural selection and evolution of populations.
- Behavioral Ecology: Study of imprinting and instinct's role in animal social lives.
Scientists Who Made Contributions in Ecology
- Theophrastus (300BC): Studied the relationship between organisms and the environment; considered the father of botany.
- Ernst Haeckel: Father of ecology; coined the term ecology from Greek roots.
- Thomas Malthus (1766-1834): Studied populations.
- Charles Darwin (1809-1882): Developed the theory of natural selection.
Laws of Ecology
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- Law: Nature knows best; Principle: Balance of nature.
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- Law: All forms of life are important; Principle: Diversity and Stability.
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- Law: Everything changes; Principle: Change.
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- Law: Everything is connected to everything else; Principle: Interdependence.
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- Law: Everything goes somewhere; Principle: Pollution and Accumulation.
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- Law: Our's a finite resources; Principle: Finiteness of resources.
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- Law: There is no such thing as a free lunch; Principle: Energy.
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- Law: Nature is beautiful, and we are the stewards of God's creation; Principle: Stewardship
Major Ecosystem Components
- Abiotic components:
- Temperature, water, moisture, light, soil, wind, precipitation, salinity, and time.
- Tolerance limits for populations, limiting factors affecting population abundance.
- Biotic components:
- Producers (plants),
- Consumers (animals),
- Decomposers (bacteria, fungi).
- Biotic interactions (predation, competition, symbiosis, parasitism, commensalism).
Biotic Components of Ecosystems
- Producers (autotrophs): Source of all food; photosynthesis.
- Consumers (heterotrophs):
- Aerobic respiration, Anaerobic respiration (methane, H₂S).
- Decomposers (matter recyclers): Release organic compounds into soil and water used by producers.
Producers: the First Trophic Level
- Autotrophs ("self-feeders"): Capture solar energy for photosynthesis producing sugars.
- Green plants, cyanobacteria, algae.
- Chemosynthetic bacteria: Use geothermal energy in hot springs or deep-sea vents to produce food.
Photosynthesis: Function of Producers
- Light reaction: Uses light to produce ATP and NADPH; releases oxygen, happens in grana.
- Dark reactions (Calvin cycle): Uses ATP and NADPH plus CO₂ to produce sugar, happens in stroma.
Overall Reaction of Photosynthesis
- 6CO₂ + 12H₂O + light energy → C₆H₁₂O₆ + 6O₂ + 6H₂O
Consumers
- Primary consumers (second trophic level): Herbivores (deer, grasshoppers) that consume plants.
- Secondary Consumers (third trophic level): Carnivores that prey on primary consumers (wolves, rodents).
- Tertiary Consumers (fourth trophic level): Predators at the highest trophic level; consume secondary consumers (hawks, owls).
- Omnivores: Consume both plants and animals.
Cellular Respiration Overview
- Transformation of chemical energy (organic compounds) in food into usable chemical energy (ATP) for cells.
- Occurs in plants and animals; steps include glycolysis, Krebs cycle, and electron transport.
Detritivores and Decomposers
- Detritivores: Consume non-living organic matter (scavengers of waste or dead bodies); example: millipedes.
- Decomposers: Break down leaf litter and non-living materials; Enhance topsoil and recycle nutrients; example: fungi, bacteria.
Abiotic Components: Temperature
- Affects living things in two ways: (1) affects internal processes; (2) affects behavior in ecosystems.
- Living things function optimally within specific temperature ranges.
- Minimum temperature: Lower limit, where organisms can still function.
- Maximum temperature: Highest limit, where organisms can still function.
- Optimum temperature: Ideal temperature, where organisms function best.
- Tolerance limits for populations.
Abiotic Components: Water
- Plants and animals maintain a favorable water balance.
- Plant adaptations:
- Xerophytes (arid conditions): Succulent tissue.
- Hydrophytes (aquatic): Floating/submerged, air spaces.
- Halophytes (marine): Succulent tissue.
Abiotic Components: Light
- Main source of energy in ecosystems.
- Important for photosynthesis and the formation of vitamin D in animals.
- Shade tolerance: Ability of plants to survive & grow in shade.
- Photoperiodism: Reactions to changes in day length.
- Ozone: Protects Earth from excessive solar radiation, ozone depletion: Caused by CFCs & NO.
Abiotic Components: Soil
- Formed by mechanical or chemical weathering of rocks plus addition of humus.
- Soil texture: Clay (fine particles), sand (coarse particles), silt (medium), loam (mixture).
- Soil moisture (water content): Affected by texture, rainfall, slope, and underlying rock types.
- Soil acidity: Affected by the presence of lime or granite.
- Soil structure: arrangement of soil particles, creating peds (larger structures) for water and gas drainage.
- Soil color: iron affects color (reddish/brownish or gray).
- Soil profile: Layers (horizons) differ in composition; example: O, A, B, C, R horizons.
Abiotic Components: Wind or Air
- Wind is an agent for pollination and seed dispersal.
- Transpiration in plants and evaporation in animals occur faster in the presence of wind.
- Strong winds can damage ecosystems.
Abiotic Components: Time
- Ecosystems are dynamic and affected by time.
- Factors influenced by time include food-hunting-gathering abilities (affecting predator-prey relationships) and reproductive cycles & mate-finding in organisms. - Important for organisms' movements and locomotion based on time.
Limiting Factors Influence on Land and H₂O
- Terrestrial: Sunlight, temperature, precipitation, soil nutrients, fire frequency, wind, latitude, and altitude.
- Aquatic/Marine: Light penetration (water clarity), water currents, dissolved nutrient concentrations, dissolved oxygen concentrations, and salinity.
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Description
This lesson explores the fundamental processes within ecosystems, including energy flow, nutrient cycles, and the roles of producers, consumers, and decomposers. It also describes the levels of ecological organization from individual organisms to entire ecosystems. Chemosynthesis and photosynthesis are compared.