Interactions in Ecosystems
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Questions and Answers

In which type of symbiotic relationship does one species benefit while the other is unaffected?

  • Competition
  • Commensalism (correct)
  • Parasitism
  • Mutualism
  • Which of the following is NOT a characteristic of mangroves?

  • They grow in dry, sandy soil. (correct)
  • They provide shelter for wildlife.
  • They thrive in warm, salty environments.
  • They help protect coastlines.
  • What is the primary source of nutrients in estuaries and coastal wetlands?

  • Predation by seagulls
  • Sea salt evaporation
  • Mangrove roots
  • The mixing of freshwater and saltwater (correct)
  • Which type of symbiotic relationship is represented by a leech attaching to a fish and drinking its blood?

    <p>Parasitism (A)</p> Signup and view all the answers

    How do seagrass beds contribute to coastal ecosystems?

    <p>They stabilize shorelines and reduce wave impact. (D)</p> Signup and view all the answers

    What type of water is found in estuaries?

    <p>Brackish water (D)</p> Signup and view all the answers

    Which of the following is an example of a mutualistic relationship?

    <p>A clownfish living in a sea anemone (B)</p> Signup and view all the answers

    What is the term for the close and long-term interaction between two different species?

    <p>Symbiosis (C)</p> Signup and view all the answers

    What is the primary source of the majority of ocean salts, according to the content?

    <p>Tectonic movements releasing minerals (C)</p> Signup and view all the answers

    Which of the following substances is not released through outgassing from volcanoes and rift vents due to tectonic movement?

    <p>Oxygen (B)</p> Signup and view all the answers

    What is the primary function of chlorophyll in plankton?

    <p>To help capture sunlight for photosynthesis (C)</p> Signup and view all the answers

    What is the main reason plankton stay near the surface of the water?

    <p>To access sunlight for photosynthesis (B)</p> Signup and view all the answers

    Which of these is NOT a type of salt mentioned in the text?

    <p>Rock Salt (B)</p> Signup and view all the answers

    What is the primary difference between plankton and zooplankton?

    <p>Plankton are plant-like, while zooplankton are animal-like (B)</p> Signup and view all the answers

    What does the statement 'The Ocean is in Chemical Equilibrium' imply about the ocean’s salt content?

    <p>The salt content is relatively constant (A)</p> Signup and view all the answers

    What is the primary function of cilia in some plankton?

    <p>To help plankton move and catch food (D)</p> Signup and view all the answers

    Which of the following is NOT a dissolved salt found in seawater?

    <p>Calcium (A)</p> Signup and view all the answers

    What is the primary reason for the ocean's chemical equilibrium?

    <p>Continuous input and output of dissolved salts (C)</p> Signup and view all the answers

    Which of these is an example of a source of ocean salts from the Earth's crust?

    <p>All of the above (D)</p> Signup and view all the answers

    Which of the following is NOT a reason why plankton stay near the surface of the water?

    <p>To obtain dissolved salts (B)</p> Signup and view all the answers

    Which of these statements accurately describes the role of precipitation and evaporation in ocean salinity?

    <p>Evaporation increases salinity, while precipitation decreases salinity. (D)</p> Signup and view all the answers

    Which of the following is the most abundant dissolved ion in seawater?

    <p>Chloride (A)</p> Signup and view all the answers

    How does higher salinity affect the freezing point of water?

    <p>It lowers the freezing point. (A)</p> Signup and view all the answers

    Which of the following structures is NOT used by some plankton for movement or obtaining food?

    <p>Chlorophyll (C)</p> Signup and view all the answers

    What is the primary way in which tectonic movement contributes to the ocean's salt content?

    <p>By releasing deeply trapped substances like chlorine and sulfur through outgassing from volcanoes (D)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a third trophic level consumer?

    <p>Herbivore (C)</p> Signup and view all the answers

    Which of the following is an example of an abiotic factor that affects an organism's survival?

    <p>The amount of rainfall in the area (C)</p> Signup and view all the answers

    Which level of organization includes all living organisms on Earth?

    <p>Biosphere (C)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a food web?

    <p>Represents a linear relationship between organisms (C)</p> Signup and view all the answers

    Which of the following statements accurately describes the relationship between producers and consumers?

    <p>Consumers consume producers to gain energy (C)</p> Signup and view all the answers

    Which of the following statements correctly describes the role of decomposers in an ecosystem?

    <p>Decomposers obtain energy from breaking down dead organisms (D)</p> Signup and view all the answers

    Which of the following is the most appropriate definition of a biome?

    <p>A group of ecosystems with similar abiotic factors and dominant communities (B)</p> Signup and view all the answers

    Which of the following is NOT an example of biotic factors?

    <p>Temperature (B)</p> Signup and view all the answers

    What is the main reason why mangroves are perfectly suited to survive in their unique environment?

    <p>All of the above. (D)</p> Signup and view all the answers

    Which of the following is NOT a threat to estuaries?

    <p>Increased fishing pressure. (C)</p> Signup and view all the answers

    What is the primary characteristic that distinguishes the Dysphotic zone from the Aphotic zone?

    <p>The presence of sunlight. (A)</p> Signup and view all the answers

    What type of estuary is characterized by a barrier between the ocean and a river's freshwater?

    <p>Bar Built Estuary (B)</p> Signup and view all the answers

    Which of the following is an example of a commensal symbiotic relationship?

    <p>A jackfish swimming alongside a shark. (C)</p> Signup and view all the answers

    What is the main role of estuaries and coastal wetlands in maintaining water quality?

    <p>They filter out toxic pollutants, excess nutrients, and sediments. (C)</p> Signup and view all the answers

    Which of the following organisms is NOT commonly found in estuaries?

    <p>Seals (A)</p> Signup and view all the answers

    What is the main reason why estuaries are considered highly productive ecosystems?

    <p>They receive a mixture of freshwater and saltwater, providing abundant nutrients. (C)</p> Signup and view all the answers

    Which of the following factors DOES NOT contribute to the unique characteristics of estuaries?

    <p>Consistent water temperature. (C)</p> Signup and view all the answers

    What is the primary benefit that both species gain in a mutualistic symbiotic relationship?

    <p>All of the above. (D)</p> Signup and view all the answers

    What is the significance of the 'National Estuarine Research Reserve System' established in 1972?

    <p>It designates certain estuaries as protected areas. (D)</p> Signup and view all the answers

    Which of the following DOES NOT describe the Benthic Zone?

    <p>Located in the Pelagic zone. (D)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the Epipelagic zone?

    <p>Characterized by the presence of chemosynthetic organisms. (B)</p> Signup and view all the answers

    What is the primary function of the special pores in the vascular plants found in estuaries and mangroves?

    <p>To remove excess salt from their tissues. (B)</p> Signup and view all the answers

    What is the primary reason why estuaries are considered nurseries for many types of fish?

    <p>All of the above. (D)</p> Signup and view all the answers

    What is ecology?

    <p>The scientific study of interactions among and between organisms and their environment.</p> Signup and view all the answers

    What is the main energy source for life on Earth? How do autotrophs harness this energy?

    <p>The main energy source for life on Earth is the sun. Autotrophs, such as plants, harness this energy through photosynthesis.</p> Signup and view all the answers

    Producers capture more than 2% of the sun's energy.

    <p>False (B)</p> Signup and view all the answers

    What are trophic levels?

    <p>Each step in a food chain or web.</p> Signup and view all the answers

    Which type of organism makes its own food from light or chemical energy?

    <p>Producers/Autotrophs (B)</p> Signup and view all the answers

    Which type of organism gets energy by eating other organisms?

    <p>Consumers/Heterotrophs (B)</p> Signup and view all the answers

    What must a consumer have to survive?

    <p>A producer.</p> Signup and view all the answers

    What is the difference between a food chain and a food web?

    <p>A food chain shows a single path of energy transfer, while a food web depicts interconnected food chains, showcasing a more complex network of energy flow in a community.</p> Signup and view all the answers

    Why is it important that arrows in a food web point from prey to predator?

    <p>The arrow represents the flow of energy from the organism being eaten (prey) to the organism consuming it (predator).</p> Signup and view all the answers

    Explain why interactions are important in an ecosystem.

    <p>Interactions create a web of interdependence between organisms and their environment, fostering a complex balance and contributing to the intricate functioning of the ecosystem.</p> Signup and view all the answers

    Define organism.

    <p>An individual living thing made up of one or many cells.</p> Signup and view all the answers

    Which of the following is the largest level of organization?

    <p>Biosphere (B)</p> Signup and view all the answers

    What is a population?

    <p>A group of organisms of the same species that live in the same area.</p> Signup and view all the answers

    What is a community?

    <p>Groups of different populations that live in the same area.</p> Signup and view all the answers

    What is an ecosystem?

    <p>All organisms in specific areas plus non-living, physical environments.</p> Signup and view all the answers

    What is a biome?

    <p>A group of ecosystems with the same climate and dominant communities.</p> Signup and view all the answers

    What is the biosphere?

    <p>All living parts of the planet - from 8 km above to 11 km below earth's surface.</p> Signup and view all the answers

    Which of the following is an example of a biotic factor?

    <p>Availability of food (D)</p> Signup and view all the answers

    Define habitat.

    <p>Where an organism lives (its address).</p> Signup and view all the answers

    What is symbiosis?

    <p>A close and long-term interaction between two different species that can be mutualistic, commensal, or parasitic.</p> Signup and view all the answers

    What is competition?

    <p>Organisms of two species use the same limited resource, leading to a negative impact on each other.</p> Signup and view all the answers

    What is predation?

    <p>A member of one species, the predator, eats all or part of the body of a member of another species, the prey.</p> Signup and view all the answers

    What is mutualism?

    <p>A long-term, close association between two species in which both benefit.</p> Signup and view all the answers

    What is commensalism?

    <p>A long-term, close association between two species in which one benefits, and the other is unaffected.</p> Signup and view all the answers

    What is parasitism?

    <p>A long-term, close association between species in which one benefits, and the other is harmed.</p> Signup and view all the answers

    Where do mangroves thrive?

    <p>Mangroves thrive in warm, salty environments, often found in tropical and subtropical regions.</p> Signup and view all the answers

    What are estuaries?

    <p>Places where freshwater from rivers mixes with salty ocean water.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of estuaries?

    <p>Constant temperature (D)</p> Signup and view all the answers

    What is brackish water?

    <p>A mixture of salt and freshwater.</p> Signup and view all the answers

    Coastal aquatic systems can help filter pollutants and excess nutrients from water.

    <p>True (A)</p> Signup and view all the answers

    What type of estuary is formed by faulting?

    <p>Tectonic (D)</p> Signup and view all the answers

    What are the main threats to estuaries?

    <p>Development, dredging, disposal of dredged sediments, and toxic runoff.</p> Signup and view all the answers

    What is the National Estuarine Research Reserve System?

    <p>A system created by Congress in 1972 to protect and manage estuaries across the United States.</p> Signup and view all the answers

    What are some adaptations that organisms living in estuaries have?

    <p>Organisms living in estuaries have evolved adaptations to tolerate varying salinity levels, such as strong shells in oysters and the ability to migrate with tides in fish and zooplankton.</p> Signup and view all the answers

    What is ocean salinity?

    <p>The total quantity or concentration of dissolved inorganic solids in water.</p> Signup and view all the answers

    Seawater is mostly composed of water.

    <p>True (A)</p> Signup and view all the answers

    What is the most abundant salt in seawater?

    <p>Sodium chloride (NaCl).</p> Signup and view all the answers

    Why does seawater evaporate more slowly than freshwater?

    <p>Dissolved salts attract water molecules, making it harder for seawater to evaporate compared to freshwater.</p> Signup and view all the answers

    Every element present in the Earth's crust and atmosphere is present in seawater, but in extremely small amounts.

    <p>True (A)</p> Signup and view all the answers

    What are some sources of the ocean's salts?

    <p>The ocean's salts come from a variety of sources, including rain, groundwater, crashing waves, river water, and hydrothermal vents.</p> Signup and view all the answers

    How are tectonic movements involved in the ocean's chemistry?

    <p>Tectonic movements release substances like carbon dioxide, chlorine, sulfur, hydrogen, fluorine, and nitrogen through volcanic activity and rift vents, contributing to the ocean's composition.</p> Signup and view all the answers

    What is chemical equilibrium in the ocean?

    <p>The proportions and amounts of dissolved salts per unit volume of ocean remain relatively stable because the ocean is constantly receiving and losing salts.</p> Signup and view all the answers

    What are plankton?

    <p>Small, plant-like organisms that live in the water and produce their own food through photosynthesis.</p> Signup and view all the answers

    What are flagella?

    <p>Whip-like tails used by some plankton to move through the water.</p> Signup and view all the answers

    What are cilia?

    <p>Tiny, hair-like structures that help some plankton move and capture food.</p> Signup and view all the answers

    What is chlorophyll?

    <p>A green substance in phytoplankton that helps them convert sunlight into food through photosynthesis.</p> Signup and view all the answers

    Why do plankton stay near the surface of the water?

    <p>To maximize access to sunlight for photosynthesis, which is essential for their survival.</p> Signup and view all the answers

    Why do plankton move up and down in the water?

    <p>To find optimal light conditions for photosynthesis, avoid predators, and maintain their place in the food chain.</p> Signup and view all the answers

    Flashcards

    Interactions

    The relationship between biotic and abiotic factors that affects organisms and ecosystems.

    Symbiosis

    A long-term interaction between two different species, can be mutualistic, commensal, or parasitic.

    Competition

    When two species compete for the same limited resources, negatively impacting each other.

    Mutualism

    A symbiotic relationship where both species benefit from the interaction.

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    Commensalism

    A symbiotic relationship where one species benefits and the other is unaffected.

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    Parasitism

    A symbiotic relationship where one species benefits at the expense of the other.

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    Mangroves

    Coastal trees/shrubs that thrive in salty environments, vital for ecosystems.

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    Estuaries

    Where freshwater from rivers meets salty ocean water, creating productive ecosystems.

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    Table Salt

    A mix of sodium and chlorine, primarily used for seasoning.

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    Epsom Salt

    A mineral compound made of magnesium sulfate (MgSO4).

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    Sources of Ocean Salts

    Salts enter oceans via rain, groundwater, rivers, and surf.

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    Chemical Equilibrium in Oceans

    Salts in ocean water maintain nearly constant proportions.

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    Plankton

    Small, plant-like organisms in water that perform photosynthesis.

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    Zooplankton

    Animal-like organisms that drift in water and may consume others.

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    Chlorophyll

    Green pigment in phytoplankton that captures sunlight for photosynthesis.

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    Flagella and Cilia

    Structures that help plankton move—flagella are whip-like, cilia are tiny hairs.

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    Ecology

    The scientific study of interactions among organisms and their environment.

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    Energy Flow

    The transfer of energy from one organism to another in an ecosystem.

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    Trophic Levels

    The levels in a food chain showing different roles of organisms in energy transfer.

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    Producers

    Autotrophs that make their own food using sunlight or chemicals.

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    Primary Consumer

    The first consumer in a food chain, usually herbivores that eat producers.

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    Decomposers

    Organisms that break down dead matter, recycling nutrients into the soil.

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    Food Chain vs. Food Web

    Food chains show linear energy transfers, while food webs show interconnected chains in a community.

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    Biotic vs. Abiotic Factors

    Biotic factors are living influences; abiotic factors are non-living characteristics affecting organisms.

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    Ocean Salinity

    The total concentration of dissolved solids in ocean water, typically around 3.5%.

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    Salinity Variations

    Changes in salinity due to precipitation, evaporation, and runoff from land.

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    Dissolved Salts

    The salts in seawater, primarily sodium chloride, that affect water properties.

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    Chloride Ion

    The most abundant ion in seawater, making up a significant portion of dissolved salts.

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    Hydrothermal Vents

    Underwater openings that release minerals into the ocean, contributing to salt content.

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    Tectonic Movements

    Earth processes that supply minerals to seawater through volcanic activity and rifting.

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    Plankton Migration

    The upward and downward movement of plankton to optimize light exposure and avoid predators.

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    Phytoplankton

    Plant-like plankton that use photosynthesis to produce their food.

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    Zooplankton Details

    Animal-like plankton that drift in water and feed on other organisms.

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    Concentration of Dissolved Solids

    The proportion of dissolved materials in seawater, affecting density and evaporation.

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    Habitat

    Where an organism lives, like its address.

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    Niche

    The role and use of resources by an organism in its habitat.

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    Pelagic Zone

    Water portion of the ocean divided into zones, including Neritic and Oceanic.

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    Neritic Zone

    The ocean area between the low tide mark and the continental shelf.

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    Epipelagic Zone

    Upper Oceanic zone with light penetration, where most marine life exists.

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    Mesopelagic Zone

    Middle Oceanic layer with limited sunlight, from 200m to 1000m deep.

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    Abyssal Pelagic

    Deep ocean zone below 4000m, known for its extreme depths.

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    Photic Zone

    Sunlit zone where light penetrates down to 200m, supporting abundant life.

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    Brackish Water

    A mixture of saltwater and freshwater found in estuaries.

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    Coral Reefs

    Biodiverse underwater ecosystems formed by coral polyps.

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    Consumers

    Organisms that obtain energy by eating others; heterotrophs.

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    Secondary Consumers

    2nd level consumers that eat primary consumers; can be carnivores or omnivores.

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    Tertiary Consumers

    3rd level consumers that eat secondary consumers; often top predators.

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    Food Chain

    A linear representation of energy transfer between organisms.

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    Food Web

    Complex network of interconnected food chains within an ecosystem.

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    Biotic Factors

    Living influences that affect organisms in an ecosystem.

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    Abiotic Factors

    Non-living characteristics that shape ecosystems, like climate and soil type.

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    Dysphotic Zone

    Twilight zone of the ocean from 200m to 1000m where light decreases rapidly.

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    Salinity

    The measure of dissolved salts in water, affecting marine life.

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    Oceanic Zones

    Distinct regions of the ocean, including neritic and pelagic zones.

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    Intertidal Zone

    Area between high and low tide marks, rich in marine life.

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    Benthic Zone

    The ocean floor, home to various organisms adapted to its conditions.

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    Seasonal Species

    Species that inhabit estuaries during specific seasons, often as juveniles.

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    Marine Biodiversity

    The variety of species in ocean ecosystems, essential for resilience and balance.

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    Nutrient Cycling

    The movement and exchange of organic and inorganic matter back into the production of living matter.

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    Study Notes

    Interactions in Ecosystems

    • Biotic (living) and abiotic (non-living) factors influence organism survival and growth.
    • Ecosystem productivity depends on biotic and abiotic factors.
    • Symbiosis involves long-term relationships (mutualistic, commensal, parasitic).
    • Competition occurs when species use shared, limited resources. (Example: crabs and snails competing for hiding places)
    • Predation involves one species consuming another. (Example: seagulls eating fish)
    • Mutualism benefits both species. (Example: clownfish cleaning anemones, benefiting both)
    • Commensalism benefits one species without affecting the other. (Example: jackfish swimming with sharks)
    • Parasitism benefits one species and harms the other. (Example: leeches feeding on fish blood)
    • Interactions: a complex web of interdependence between organisms and their environment.

    Estuaries and Mangroves

    • Mangroves are coastal trees/shrubs, mainly tropical/subtropical, adapted to salt and oxygen-poor environments. Adaptations include specialized roots and leaves.
    • Mangroves provide coastal protection, wildlife shelter, and water filtration.
    • Estuaries are freshwater/saltwater mixing zones (river mouths, inlets, bays, sounds, marshes, mangrove forests).
    • Estuaries and Coastal Wetlands are highly productive due to available light and nutrients.
    • Seagrass beds support diverse marine life, stabilize shorelines, and reduce waves.
    • Brackish water is a mixture of freshwater and saltwater.
    • Estuaries provide valuable ecological and economic services for humans (water quality, food, timber, recreation, storm damage reduction, erosion).
    • Coral Reefs, Estuaries and Mangroves are high biodiversity centers harboring many organisms, notably a significant fraction of marine species and serve as nurseries.
    • Estuaries characteristics: daily tidal rhythms, freshwater runoff, salinity fluctuations, diverse substrates.
    • Four types: drowned river mouths (Chesapeake Bay), fjords (glacially carved), barrier-built, tectonic.
    • Mangroves and vascular plants can remove excess salt.
    • Invertebrates (barnacles, mussels, periwinkles, fiddler crabs, marsh snails, shrimp, clams, worms)
    • Seasonal fish species (striped bass, bluefish, menhaden, surfperch).
    • Birds like herons, sandpipers, pelicans, ospreys, ducks, geese.
    • Mammals like manatees.
    • Threats: development, dredging, sediment disposal, toxic runoff.
    • Estuaries support adaptations for tolerating varying salinity (invertebrates like oysters, phytoplankton, zooplankton that migrate with tides).
    • Conservation efforts: National Estuarine Research Reserve System.

    Ocean Salinity

    • Ocean salinity is the total dissolved inorganic solids in seawater. (97.2% of Earth's surface water is marine).
    • Salinity ranges between 3.3% and 3.7%. Variability caused by precipitation, evaporation, and freshwater runoff.
    • Ocean salts primarily come from weathering of rocks, groundwater, river runoff, volcanic activity and tectonic movements.
    • The majority of the components from ocean water come from tectonic movement.
    • The most abundant salt is sodium chloride (NaCl). Other major salts include chloride, sodium, sulfate, magnesium, calcium, potassium, and bicarbonate.
    • Ocean water has chemical equilibrium, meaning salt proportions remain relatively constant.
    • Ocean (seawater) is about 96.5% water and 3.5% dissolved substances.

    Plankton and Zooplankton

    • Plankton are microscopic plant-like organisms performing photosynthesis.
    • Zooplankton are animal-like organisms drifting in water, some growing into larger animals.
    • Movement: Plankton use flagella, cilia, or spines for movement and buoyancy.
    • Nutrition: Zooplankton may consume other organisms.
    • Sunlight: Plankton primarily reside near the surface for optimal photosynthesis, moving vertically to find food, avoid predators, and manage a position in the food chain.
    • Photosynthesis: Plankton use chlorophyll to convert sunlight into energy.

    Energy Flow

    • Autotrophs harness energy via photosynthesis.
    • Producers trap less than 2% of solar energy.
    • Trophic levels represent each step in a food chain or web.
    • Producers (autotrophs): 1st trophic level, create their food via light or chemical energy.
    • Consumers (heterotrophs): 2nd, 3rd etc. trophic levels, feeding on other organisms. (1st level=primary consumer, herbivore, 2nd level=secondary consumer, carnivore or omnivore, 3rd level=tertiary consumer, carnivore or omnivore)
    • Decomposers (detritivores) break down dead organisms returning nutrients to the environment.
    • Food chain: shows energy transfer from sun through organisms.
    • Food web: interconnected food chains.

    Levels of Organization

    • Levels of organization: individual, population, community, ecosystem, biome, biosphere.
    • Individual: single organism of a species.
    • Population: group of same-species organisms.
    • Community: group of different populations.
    • Ecosystem: all organisms and their abiotic surroundings.
    • Biome: ecosystems with similar climate & dominant communities.
    • Biosphere: all life on Earth.

    Biotic and Abiotic Factors

    • Biotic factors: living influences on an organism. (predators, prey, competitors).
    • Abiotic factors: non-living aspects influencing survival (climate, soil type, salinity, temperature, precipitation).
    • Interactions of biotic and abiotic factors determine organism survival and ecosystem productivity.

    Organisms, Habitats and Niches

    • Organism: individual living thing (single-celled or multi-celled).
    • Habitat: an organism's living area.
    • Niche: organism's role in its environment (physical & biological conditions, its use of them). (Example: Bullfrog-eats insects, worms, and lives near water)

    Ocean Zones

    • Intertidal zone: between high/low tide.
    • Neritic zone: low tide to continental shelf.
    • Benthic zone: ocean seafloor.
    • Pelagic zone: open water portion of the ocean (vertical regions).
    • Oceanic zone: open ocean waters.
    • Epipelagic: upper part of oceanic zone, sunlight.
    • Mesopelagic: middle part of oceanic zone, light penetration weaker.
    • Bathypelagic: deeper oceanic zone
    • Abyssal Pelagic: even deeper, seabed
    • Hadalpelagic: deepest part in ocean trenches
    • Light Zones: photic (sunlit, highest productivity), disphotic (twilight), aphotic (dark).
    • Ocean depth increases: temperature decreases, pressure increases, salinity generally more stable or slightly increasing.

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    Description

    Explore the complex relationships that define ecosystems, including survival, growth, and productivity driven by both biotic and abiotic factors. This quiz covers concepts like symbiosis, competition, predation, mutualism, and commensalism through real-life examples. Test your understanding of how these interactions impact the environment and species involved.

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