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Mesopelagic
Basics
Mesopelagic Food Web
Body Design
Deep Sea & Floor
Vents Communities
100

The deep ocean is divided into these two major regions.

Mesopelagic zone and deep sea
100

Instead of hunting, organisms in the mesopelagic do this to obtain food.

Sit and wait

100

Mesopelagic fishes have large, sensitive _____ that help them see despite the lack of light.

Eyes

100

The deep-sea has consistent physical conditions in terms of salinity, darkness, and this other variable. 

Temperature (it's very cold)

100

Hydrothermal vents increase this variable, making the water more suitable for communities of species

Temperature

200

Oxygen is still required by these organisms thankfully there is plenty of it in the deep sea due to the ________ of oceanic waters 

Mixing

200
The term for organisms that, at rest, do not float or sink

Neutrally buoyant

200

Some fishes have this type of eye which acts like a tiny telescope, providing long-range vision

Tubular eye

200

Zonation in the deep sea is due to this variable.

Pressure

200
Some bacteria can undergo this process that allows them to use the energy of the vent to make organic matter.

Chemosynthesis

300

The mesopelagic represents this area of the ocean depths.

About 200-1000 meters

300

The term in which some mesopelagic organisms move up to epipelagic zone at night to find food. 

Vertical Migration

300

Some fishes in the mesopelagic have a sensitive _____ _____ which help them sense vibrations in the water.

Lateral line

300

This is the term for a relationship between a male and female of the same species when the male permanently attaches himself to her blood supply.

male parasitism

300

Chemosynthetic baceria have a symbiotic relationship with these organism in hydrothermal vent communities

Giant tube worms

400

There is a tiny amount of light in the highest regions of the mesopelagic but not enough to support this process of autotrophs

Photosynthesis

400
Fishes that swim up to the epipelagic at night in search of food have this anatomical structure that makes them more buoyant, helping them move up or down through the water column.

Swim bladder

400

Some organisms in the mesopelagic are this bright color, which is virtually invisible because it had few pigments.

Red

400

This group of organisms represents the largest animal group on the deep sea floor.

Meiofauna

400

This is a highly sensitive chemical that can capture a single photon of light every eight hours

Bacteriochlorophyll

500

The structures that allow some mesopelagic organisms to produce light

Photophores

500

Mesopelagic regions thrive all the more if the epipelagic region above them has a high ______ _______.

Primary Productivity

500

These are the two biological chemicals that allow for bioillumination.

Luciferin and Luciferase

500
Suspension feeders are few but this other type of feeder dominates the deep sea floor

Deposit feeders

500

Hydrothermal vents are hot enough to produce black body radiation which produces this type of light that some organisms can use for photosynthesis.

Infrared light