Succession and Aquatic Organisms

Bottom dwelling organisms.

• Plankton
• Fish
• Mammals
• Benthos

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Two factors that determine where an organism lives in aquatic ecosystem are 

• Temperature and sunlight
• Neighbors and housing prices
• Fish and wildlife
• Darkness and tree height

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Aquatic life is abundant, diverse, and full of sunlight at which zone?

• littoral zone

• benthic zone

• limnetic zone

The bottom region of oceans and bodies of fresh water is 

• Benthos
• Benthic Zone
• Limnetic Zone
• Nekton

An area in which fresh water from a river mixes with salt water from the ocean

• Mangrove Swamp
• Estuary
• Marshes
• Wetland

Salinity refers to

• how many plants are in the water

• how many organisms live in the water

• how much salt in is water

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A disease reduces the number of young salmon in a river. Which population will MOST likely increase as a result?

• trout and eagle

• algae and trout

• sculpin and algae

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Which is a difference between abiotic and biotic factors?

• Abiotic factors are plants and biotic factors are animals.

• Abiotic factors are all living things and biotic factors are all nonliving things.

• Abiotic factors are all nonliving things and biotic factors are all living things.

Which type of ecosystem has the greatest variation in temperature from its top to its bottom?

• lake

• pond

• ocean

• estuary

The major abiotic factors that influence aquatic ecosystems include

• water temperature and amount of light
• plants and animals
• water and plants growing there

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