Lecture 1 Flashcards

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1
Q

pros of living in the water?

A

it provides a medium that is x800 more dense than air & more viscous this means there is less need for structural support

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2
Q

cons of living in water?

A

in regions with strong currents(intertidal region) major stress a placed on organisms especially given the higher density of water when compared to air
diffusion is much slower in water than air

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3
Q

When do spring tides occur?

A

Spring tides occur when the sun and moon are lined up, so get
maximum gravitational pull → maximum tidal range

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4
Q

When do neap tides occur?

A

Neap tides occur when sun, earth and moon form a right angle and gravitational effects are minimal

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5
Q

what is the zone from 200-250m called?

A

surface layer (photic zone/pelagic)

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6
Q

what is the zone from 200m-2km called?

A

midwater (mesopelagic) → deep sea

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7
Q

what is the bottom layer of the ocean called?

A

Abyssal bottom (bathypelagic and abyssopelagic)

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8
Q

What is the worldwide circulation of water called?

A

the thermohaline circulation

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9
Q

how are the oceans often divided?

A

Oceans can be divided into biogeographical regions defined by temperature

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10
Q

which light wavelength penetrates water the best?

A

blue

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11
Q

which light wavelength penetrates water the worst?

A

red

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12
Q

What are the basic nutrients?

A

N, Si, P and Fe (& Zn)

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13
Q

What could cause nutrient supply to not be stable?

A

water column is stratified,

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14
Q

What depletes nutrients In (semi)enclosed water bodies and stratified systems?

A

algal activity will deplete the nutrients leading to establishment of
oligotrophic conditions

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15
Q

why are upper layers of ocean often depleted in nutrients?

A

Due to phytoplankton activity in the upper layers, these waters are often characterised by nutrient depletion.

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