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Intraspecific competition is a competition between individuals from the same species

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Interspecific competition is the competition between individuals of different species

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Bioaccumulation is the gradual accumulation of substances

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exclusion principle says that two species can't coexist if they occupy exactly the same niche

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Continuous increase or decrease in a population in which the rate of change is proportional to the number of individuals at any given time.

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Pyramid of numbers shows the total number of individual organisms at each level in the food chain of an ecosystem.

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is a graphical representation of the energy found within the trophic levels of an ecosystem

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Dissolved organic matter (DOM) is found in every water body, both marine and freshwater

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Nekton are living organisms that are able to swim and move independently of currents.

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An organism is considered plankton if it is carried by tides and currents, and cannot swim well enough to move against these forces

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relating to, or living or occurring in the open sea

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Benthic refers to anything associated with or occurring on the bottom of a body of water.

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detritus is dead particulate organic material

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an organism (such as an earthworm or a fungus) that feeds on dead and decomposing organic matter.

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trophic level of an organism is the position it occupies in a food web.

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biological diversity is the variety and variability of life on Earth

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Zooplankton are small, aquatic microorganisms in the water column that include crustaceans, rotifers, open water insect larvae and aquatic mites

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organisms that contain chlorophyll and require sunlight in order to live and grow

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a host is a larger organism that harbours a smaller organism

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Symbiont is the term used to refer to an organism living in a symbiosis.

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cleaner organisms that remove ectoparasites and other material, such as mucus, scales and skin, from the body surfaces of other apparently co-operating animals.

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Parasitism is a nonmutual relationship between two organisms in which one benefits at the expense of the other.

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a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.

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Symbiosis is any type of a close and long-term biological interaction between two different biological organisms

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Symbiosis is any type of a close and long-term biological interaction between two different biological organisms

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A food web is all of the food chains in an ecosystem.

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A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another

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Organism that breaks down dead organic material

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An omnivore is an organism that eats plants and animals

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A carnivore is an organism that mostly eats meat, or the flesh of animals

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An herbivore is an organism that mostly feeds on plant

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A consumer in a food chain is a living creature that eats organisms from a different population

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DDT is an insecticide used in agriculture

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Prey is the organism which the predator eats.

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Ecological niche is a term for the position of a species within an ecosystem

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predators are those animals that live by preying on other organisms for food.

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An abiotic factor is a non-living part of an ecosystem that shapes its environment

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A biotic factor is a living organism that shapes its environment.

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Ecology is the study of organisms and how they interact with the environment around them

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What are marine habitats?

Marine habitats include coastal zones, intertidal zones, sandy shores, rocky shores, mudflats, swamps and salt marshes, estuaries, kelp forests, seagrasses, and coral reefs