G1 - ENVISCI MANUSCRIPT

COMPONENTS OF THE ECOSYSTEM

• Producers: Organisms that create their own food through photosynthesis, such as plants and algae.

• Consumers: Organisms that rely on other organisms for energy, including herbivores, carnivores, and omnivores.

• Decomposers: Organisms that break down dead matter and recycle nutrients back into the ecosystem, including fungi and bacteria.

• Abiotic Factors: Non-living components of the ecosystem that influence living organisms, such as sunlight, water, soil, and temperature.

• Trophic Levels: The hierarchical levels in an ecosystem, representing the flow of energy from producers to various levels of consumers, illustrating the interconnectedness of food chains and webs. Producers: Organisms that create their own energy through photosynthesis or chemosynthesis, forming the base of the food chain and providing energy for all other trophic levels.

Definitions of Ecology (Cabardo)

• Ecology: A branch of biology studying the relationships of living organisms with their environment.

• Origin of the term: Coined by Ernst Haeckel in 1866, derived from the Greek oikos (house) and Latin logos (study).

• Environment: Comprises physical factors and biological conditions affecting organisms' survival, growth, and reproduction.

Key Aspects of Environment

• Physical factors include:

  • Temperature

  • Humidity

  • Moisture

  • Soil

• Biological conditions: Factors affecting growth and survival but not directly utilized by organisms.

Hierarchical Levels of Life Organization

• Individuals: Organisms of the same kind (species).

• Population: Same species in a given area.

• Community: Interacting organisms in a particular area.

• Ecosystem: Various species populations interacting within the environment, exchanging matter and energy.

Ecosystems

• Types: Land-based (terrestrial) and water-based (aquatic).

• Terrestrial ecosystems consist of biomes characterized by similar vegetation. Aquatic ecosystems include diverse water environments.

Biotic Components of Ecosystems

Classifications of Organisms

1. Producers (Autotrophs): Manufacture organic matter from inorganic substances.

   • Photoautotrophs: Use sunlight (e.g., plants).

   • Chemoautotrophs: Derive energy from chemical compounds.

2. Consumers (Heterotrophs): Feed on producers or other consumers.

   • Primary Consumers: Herbivores.

   • Secondary Consumers: Carnivores.

   • Omnivores: Eat both plants and animals.

3. Decomposers: Breakdown dead matter to recycle nutrients (e.g., bacteria, fungi).

Abiotic Components of Ecosystems

• Physical and chemical factors affecting organisms:

1. Light: Source of energy; important for photosynthesis.

   • Heliophytes: Grow in full sunlight.

   • Sciophytes: Grow in shady conditions.

2. Temperature: Influences types of organisms present.

3. Water: Essential for life; plants classified as:

   • Hydrophytes: Require lots of water.

   • Mesophytes: Moderate water.

   • Xerophytes: Low water.

4. Atmospheric Gases: Influence organism survival (e.g., CO2 for photosynthesis, O2 for respiration).

5. Wind: Affects pollination, seed dispersion, and soil erosion.

6. Soil: Source of minerals and moisture; quality affects plant growth.

7. Physiographic Factors: Includes altitude, slope, and sunlight.

Law of Tolerance (Bautista)

• Shelford's Law of Tolerance: Organism success based on environmental factors with certain limits.

• Minimum, maximum, and optimum levels determine an organism's survival.

• Organisms with extensive tolerance for some factors may have limited tolerance for others.

Principles of Limiting Factors (Bornales)

Definition

• Limiting factors limit the growth and distribution of organisms in environmental science.

• Can be abiotic or biotic elements affecting organism success.

Effects of Limiting Factors

• Growth: Specific resources are essential; scarcity slows growth or halts it.

• Distribution: Determines geographical limits of species.

• Survival: Organisms must exist within certain environmental conditions.

Types of Limiting Factors

1. Abiotic Factors: Non-living elements influencing survival.

   • Examples: Temperature, water availability, soil composition.

2. Biotic Factors: Living components affecting growth and reproduction.

   • Examples: Competition for resources, predation, disease, symbiotic relationships.

Major Types of Ecosystems (Baculi)

1. Forest Ecosystems: Complex web of diverse species; key characteristics include canopy, biodiversity, and nutrient cycling.

   • Types: Tropical rainforests, temperate forests, boreal (taiga) forests.

2. Grassland Ecosystems: Predominantly grasses; key characteristics include herbivores and fire adaptations.

   • Types: Temperate grasslands, savannas, steppes, pampas.

3. Desert Ecosystems: Harsh climate with adapted species; characterized by water scarcity.

   • Types: Hot and dry deserts, semi-arid deserts, coastal deserts, cold deserts.

4. Tundra Ecosystems: Limited biodiversity and harsh conditions; key characteristics include permafrost and fragile balance.

   • Types: Arctic tundra, alpine tundra, Antarctic tundra.

5. Aquatic Ecosystems: Diverse environments in water; vulnerable to pollution and invasive species.

   • Types: Coral reefs, open ocean, deep sea, kelp forests, mangroves.

Energy Flow Through Ecosystems (Busio)

• Primary energy source is solar energy.

• Energy flows via the food chain and food web.

• Photosynthesis converts sunlight into chemical energy stored in organic products.

Trophic Levels

1. Producers (first level): Plants.

2. Primary consumers (second level): Herbivores.

3. Secondary consumers (third level): Carnivores.

4. Tertiary consumers (last level): Top carnivores.

Food Chains

1. Grazing Food Chain (GFC): Typical chain from producers to consumers.

2. Detritus Food Chain (DFC): Follows from dead organic matter to decomposers.

3. Parasitic Food Chain (PFC): Involves exploitation of larger organisms by smaller ones.

Carbon and Oxygen Cycles (Bautista)

Carbon Cycle

• Primary reservoir: Carbon dioxide in atmosphere and water.

• Photosynthesis plays a crucial role in sequestering atmospheric CO2.

• Released back via respiration and decomposition.

• Long-term carbon sinks include fossil fuels and marine sediments.

Human Impact on Carbon Cycle

• Activities such as burning fossil fuels lead to increased CO2 concentrations.

• Consequences include the greenhouse effect and global warming.

• Strategies to mitigate: Transition to renewable energy and reforestation.

Oxygen Cycle

• Constitutes 21% of Earth's atmosphere; primarily replenished through photosynthesis.

• Linked to carbon cycle; oxygen is released during photosynthesis and consumed during respiration.

Nitrogen Cycle (Bornales)

Importance

• Nitrogen essential for life; constitutes 78% of the atmosphere but is biologically inert.

Nitrogen Fixation

• Non-biological (lightning, etc.) and biological (nitrogen-fixing bacteria).

Key Processes

1. Ammonification: Decomposition of organic matter to produce ammonia.

2. Nitrification: Conversion of ammonia to nitrite and then nitrate.

3. Assimilation: Plants absorb nitrogen in usable forms.

4. Denitrification: Conversion of nitrates back to nitrogen gas.

Human Impact

• Excess nitrogen from human activities leads to environmental issues like acid rain and eutrophication.

Phosphorus Cycle

Characteristics

• Phosphorus is a sedimentary cycle; key reservoirs include rocks and sediments.

• Phosphorus is vital for plant growth; often a limiting factor.

Human Impact

• Mining and runoff introduce excessive phosphorus, causing eutrophication.

Sulfur and Hydrologic Cycles (Cabardo)

Sulfur Cycle

• Occurs in gaseous and sedimentary forms; essential for amino acids and proteins.

• Processes include mineralization, oxidation, and microbial immobilization.

Human Impact

• Emissions from fossil fuel burning and smelting lead to health issues and environmental damage.

Hydrologic Cycle

• Driven by solar energy; involves evaporation, condensation, and precipitation.

Human Impact

• Increased pollution and land use changes affect water cycles, leading to consequences like flooding and erosion.

COMPONENTS OF THE ECOSYSTEM

• Biotic factors: Include all living organisms within the ecosystem, such as plants, animals, and microorganisms that interact with each other and their environment.

• Abiotic factors: Encompass non-living elements like sunlight, temperature, soil, and water that influence the ecosystem's structure and function.

• Interactions between biotic and abiotic factors: These interactions are crucial for maintaining the balance of the ecosystem, as they determine the availability of resources and the overall health of the environment. The synergy between these factors drives ecological processes, influencing species distribution, population dynamics, and energy flow within the ecosystem. Understanding the interplay between biotic and abiotic components is essential for predicting ecosystem responses to environmental changes, such as climate shifts, habitat destruction, and pollution. Human impact: Human activities, including urbanization, agriculture, and industrialization, significantly alter both biotic and abiotic components of ecosystems, leading to changes in species composition, habitat loss, and ecosystem degradation. The consequences of these alterations can be profound, resulting in reduced biodiversity, disrupted food webs, and diminished ecosystem services that are vital for human well-being. To mitigate these impacts, it is critical to implement sustainable practices that promote conservation, restore habitats, and enhance resilience against environmental stressors. Furthermore, public awareness and education play a crucial role in fostering a culture of sustainability, encouraging individuals and communities to engage in conservation efforts and make informed decisions that benefit both the environment and society. In addition, policies that prioritize environmental protection and resource management are essential to ensure that future generations can enjoy the benefits of healthy ecosystems. This includes supporting renewable energy initiatives, reducing waste through recycling and composting, and promoting sustainable agriculture practices that minimize chemical use and conserve water resources. These actions not only help in preserving natural resources but also contribute to economic stability by creating green jobs and fostering innovation in sustainable technologies. By integrating these strategies into our daily lives and policy frameworks, we can create a synergistic approach that addresses the challenges posed by climate change and biodiversity loss. To further enhance these efforts, collaboration among governments, non-profit organizations, and the private sector is vital in developing comprehensive programs that address environmental issues on a larger scale. This multi-stakeholder approach allows for the pooling of resources and expertise, ensuring that initiatives are both effective and inclusive in their implementation. In addition, public awareness campaigns play a crucial role in educating communities about the importance of sustainability and encouraging individual actions that contribute to environmental preservation. By fostering a sense of shared responsibility, these campaigns can mobilize grassroots movements that drive change at the local level. Furthermore, establishing measurable goals and outcomes will help track progress and hold stakeholders accountable for their contributions to environmental sustainability. This accountability can be reinforced through regular reporting and feedback mechanisms, allowing stakeholders to assess the effectiveness of their strategies and make necessary adjustments to improve outcomes. Ultimately, this continuous cycle of evaluation and adaptation will enhance collaboration among stakeholders and lead to more successful and sustainable environmental practices. Implementing innovative technologies and practices will further support these initiatives, providing tools that empower communities to reduce their ecological footprints and adapt to changing environmental conditions.

Definitions of Ecology (Cabardo)

• Ecology: A branch of biology studying the complex relationships between living organisms and their environment, encompassing both biotic (living) and abiotic (non-living) components.

• Origin of the term: Coined by Ernst Haeckel in 1866, derived from the Greek oikos (house) and Latin logos (study), reflecting the idea of studying organismal homes.

• Environment: Encompasses all physical, chemical, and biological factors that comprise the habitat of organisms, influencing their survival, growth, and reproduction.

Key Aspects of Environment

• Physical factors include:

  • Temperature: Affects metabolism and survival of organisms.

  • Humidity: Influences physiological functions and water availability for organisms.

  • Moisture: Essential for plant growth and organismal hydration.

  • Soil: Provides essential minerals and nutrients for plants and habitat for various organisms.

• Biological conditions: Include factors such as competition, predation, and symbiosis that affect organismal interactions and survival but are not directly utilized as resources.

Hierarchical Levels of Life Organization

• Individuals: The basic unit; organisms of the same kind (species) that display distinct characteristics.

• Population: Groups of the same species living in a specific area, showing dynamics such as growth and decline due to various ecological factors.

• Community: An assemblage of populations of different species interacting in a particular area, characterized by species diversity, abundance, and interplay.

• Ecosystem: A functional unit comprising various species populations interacting with each other and with the physical environment, exchanging matter and energy, forming a complex web of interactions.

Ecosystems

• Types:

  • Land-based (terrestrial): Comprising various biomes characterized by distinct vegetation patterns, climate, and geography.

  • Water-based (aquatic): Encompasses freshwater (lakes, rivers) and marine environments (oceans, estuaries), each supporting unique ecosystems with varying biodiversity.

Biotic Components of Ecosystems

Classifications of Organisms

• Producers (Autotrophs): Organisms that produce organic matter from inorganic substances through processes like photosynthesis and chemosynthesis.

  • Photoautotrophs: Organisms (e.g., plants, algae) that use sunlight to create their food.

  • Chemoautotrophs: Organisms (like certain bacteria) that rely on chemical compounds as energy sources.

• Consumers (Heterotrophs): Organisms that obtain energy by consuming other organisms.

  • Primary Consumers: Herbivores that eat plants.

  • Secondary Consumers: Carnivores that eat herbivores.

  • Omnivores: Organisms that consume both plant and animal matter.

• Decomposers: Organisms (e.g., bacteria, fungi) that break down dead organic matter, facilitating nutrient recycling in ecosystems.

Abiotic Components of Ecosystems

• Physical and chemical factors affecting organisms include:

  • Light: Vital for photosynthesis; heliophytes thrive in sunlight while sciophytes prefer shade.

  • Temperature: Influences physiological rates and distributions of species, defining habitats.

  • Water: Crucial for life; plants are categorized based on water requirements:

    • Hydrophytes: Require abundant water.

    • Mesophytes: Adapted to moderate water conditions.

    • Xerophytes: Well-suited for arid environments with minimal water.

  • Atmospheric Gases: Essential for respiration and photosynthesis; CO2 and O2 levels are critical for ecosystem health.

  • Wind: Influences pollination, seed dispersal, climate regulation, and soil erosion processes.

  • Soil: The foundation for terrestrial ecosystems, providing minerals and moisture; soil quality affects plant health and growth.

  • Physiographic Factors: Include altitude, slope, and exposure to sunlight which can influence biodiversity and species distribution.

Law of Tolerance (Bautista)

• Shelford's Law of Tolerance: Key to understanding how organisms interact with their environment, indicating that an organism's success is contingent upon specific environmental factors that must fall within certain limits.

  • Defines minimum, maximum, and optimum levels for survival, growth, and reproduction.

  • Some organisms exhibit extensive tolerance for certain environmental factors but possess limited tolerance for others, shaping community structures.

Principles of Limiting Factors (Bornales)

Definition

• Limiting factors: Environmental constraints that determine the growth, distribution, and population dynamics of organisms in a given ecosystem. These factors can be either abiotic or biotic.

Effects of Limiting Factors

• Growth: The availability or scarcity of specific resources can either enhance or impede growth rates and reproductive success.

• Distribution: Limiting factors help define the geographical range in which a particular species can thrive.

• Survival: Organisms must exist within environmental conditions that allow for basic necessities such as food, water, and shelter.

Types of Limiting Factors

• Abiotic Factors: Non-living aspects influencing organism survival. For example:

  • Temperature: Extremes can be detrimental to survival.

  • Water Availability: Directly affects hydration and metabolic processes.

  • Soil Composition: Can impact the types of plants that can grow, which in turn affects the entire ecosystem.

• Biotic Factors: Living influences that can limit growth and reproduction such as:

  • Competition: Organisms vie for limited resources.

  • Predation: Presence of predators can control prey population dynamics.

  • Disease: Pathogens can directly impact population sizes and health of organisms.

  • Symbiotic Relationships: Such as mutualism and parasitism, can influence species relationships within communities.

Major Types of Ecosystems (Baculi)

• Forest Ecosystems: Feature a complex web of diverse species; characterized by layered canopies, high biodiversity, and nutrient cycling processes.

  • Types:

    • Tropical Rainforests: High biodiversity and dense vegetation fit for diverse life forms.

    • Temperate Forests: Distinct seasons with significant biodiversity.

    • Boreal (Taiga) Forests: Coniferous forests supporting unique adapted species.

• Grassland Ecosystems: Dominated by grasses, often found in areas with less rainfall, exhibiting adaptations to herbivory and fire.

  • Types:

    • Temperate Grasslands: Rich soils, often transformed into agricultural lands.

    • Savannas: Grasslands interspersed with trees, supporting diverse wildlife.

    • Steppes and Pampas: Vast open spaces characterized by grasses.

• Desert Ecosystems: Characterized by extreme conditions with adapted species; notable for water scarcity, requiring specialized survival mechanisms.

  • Types:

    • Hot and Dry Deserts: Known for extreme temperatures.

    • Semi-arid Deserts: Less extreme temperature ranges with some vegetation.

    • Coastal Deserts: Near oceanic bodies with recurring fog.

    • Cold Deserts: Characterized by cold winters and mild summers.

• Tundra Ecosystems: Reflect limited biodiversity and harsh climate; key features include permafrost and a fragile ecological balance.

  • Types:

    • Arctic Tundra: Cold, dry conditions with short growing seasons.

    • Alpine Tundra: Found at high altitudes, reminiscent of arctic tundra.

    • Antarctic Tundra: Cold, dry regions of Antarctica.

• Aquatic Ecosystems: Comprised of diverse water environments that are significant for global ecological health; sensitive to pollution and introducing invasive species.

  • Types:

    • Coral Reefs: Rich marine ecosystems, critical for marine biodiversity.

    • Open Ocean: Covers the majority of Earth's surface, supporting diverse marine life.

    • Deep Sea: Unique adaptations in species due to high pressure and darkness.

    • Kelp Forests: Underwater forests providing habitat and food sources.

    • Mangroves: Coastal ecosystems vital for shoreline protection and biodiversity prevention.

Energy Flow Through Ecosystems (Busio)

• Primary energy source: Solar energy is the foundation for all food chains in ecosystems.

• Energy flows through ecosystems via the food chain and food web, illustrating interactions between organisms at various trophic levels.

• Photosynthesis: The biochemical process that converts sunlight into chemical energy stored in organic products, fueling higher trophic levels.

Trophic Levels

1. Producers (first level): Plants serving as the primary energy source.

2. Primary consumers (second level): Herbivores that consume producers.

3. Secondary consumers (third level): Carnivores that prey on primary consumers.

4. Tertiary consumers (last level): Top carnivores that maintain population controls.

Food Chains

• Grazing Food Chain (GFC): The most common chain illustrating flow from producers through herbivores to carnivores.

• Detritus Food Chain (DFC): Describes energy flow from dead organic matter to decomposers.

• Parasitic Food Chain (PFC): Explains energy dynamics in parasitic relationships, where smaller organisms exploit larger ones for resources.

Carbon and Oxygen Cycles (Bautista)

Carbon Cycle

• Primary reservoir: Carbon dioxide present in the atmosphere and aquatic systems.

• Photosynthesis: Crucial in sequestering atmospheric CO2, converting it into organic forms.

• Carbon release through processes such as respiration and decomposition, allowing carbon to re-enter the atmosphere.

• Long-term carbon sinks: Include fossil fuels and marine sediments that store carbon over geological timescales.

Human Impact on Carbon Cycle

• Human activities, particularly fossil fuel combustion, lead to increased atmospheric CO2 concentrations, contributing to the greenhouse effect and global warming.

• Mitigation strategies: Include transitioning to renewable energy sources and implementing reforestation efforts to enhance carbon capture.

Oxygen Cycle

• Oxygen constitutes 21% of Earth’s atmosphere, mainly replenished through photosynthesis.

• This cycle is tightly linked to the carbon cycle; oxygen is released during photosynthesis and consumed during respiration by both plants and animals.

Nitrogen Cycle (Bornales)

Importance

• Nitrogen is essential for life, forming a significant part of biological molecules; it constitutes 78% of the atmosphere, yet it remains biologically inert without specific processes to convert it into usable forms.

Nitrogen Fixation

• Non-biological: Occurs through processes such as lightning, releasing nitrogen in a reactive form.

• Biological: Performed by nitrogen-fixing bacteria, converting atmospheric nitrogen into ammonia, usable by plants.

Key Processes

• Ammonification: Refers to the decomposition of organic matter, producing ammonia from dead organisms.

• Nitrification: Conversion of ammonia into nitrite and subsequently into nitrate, forms that plants can absorb.

• Assimilation: The process where plants absorb nitrogen in forms that they can use directly.

• Denitrification: The reduction of nitrates back into nitrogen gas, returning nitrogen to the atmosphere.

Human Impact

• Excess nitrogen from anthropogenic activities contributes to environmental issues such as acid rain and eutrophication, negatively affecting aquatic systems and biodiversity.

Phosphorus Cycle

Characteristics

• The phosphorus cycle is largely sedimentary, with key reservoirs including phosphate rocks and sediments in aquatic systems.

• Phosphorus is essential for plant growth and often acts as a limiting factor in ecosystems, influencing productivity levels.

Human Impact

• Human activities, particularly mining and agricultural runoff, introduce excessive phosphorus into environments, leading to eutrophication, a process that can result in harmful algal blooms and dead zones in aquatic ecosystems.

Sulfur and Hydrologic Cycles (Cabardo)

Sulfur Cycle

• The sulfur cycle has both gaseous and sedimentary phases; sulfur is necessary for the formation of amino acids and proteins essential for living organisms.

• Key processes include mineralization (release of sulfur by decomposers), oxidation (conversion of sulfides to sulfate), and microbial immobilization (uptake by organisms).

Human Impact

• Emissions from fossil fuel burning and metal smelting generate significant sulfur compounds in the atmosphere, leading to acid rain and related health risks.

Hydrologic Cycle

• The hydrologic cycle is driven by solar energy, incorporating processes of evaporation, condensation, precipitation, and infiltration, circulating water through the environment.

• Human Impact: Increased pollution, land use changes, and climate change affect this cycle, resulting in negative effects such as flooding, reduced freshwater supply, and soil erosion.

Conclusion: Understanding the components and dynamics of ecosystems is crucial for conservation efforts, sustainable resource management, and navigating the ecological impacts of human activities.