100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
AQA A Level Environmental Science Biological Resources - Fishing and Aquaculture 2024 Exam Review $7.49   Add to cart

Exam (elaborations)

AQA A Level Environmental Science Biological Resources - Fishing and Aquaculture 2024 Exam Review

 4 views  0 purchase
  • Course
  • A-level Environmental Science
  • Institution
  • A-level Environmental Science

AQA A Level Environmental Science Biological Resources - Fishing and Aquaculture 2024 Exam Review

Preview 2 out of 15  pages

  • May 21, 2024
  • 15
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
  • A-level Environmental Science
  • A-level Environmental Science
avatar-seller
RevisionKing
AQA A Level Environmental Science
Biological Resources - Fishing and
Aquaculture 2024 Exam Review
marine productivity: oceans - Answer>> - cover 70% of the
Earth's surface
- only small proportion is biologically productive
- limiting factors restrict the growth of the most important
photoautotrophic organisms

marine productivity: phosphates - Answer>> - most important
limiting factor for algal growth
- ms available for biological productivity where upwellings, ocean
currents and coastal inputs increase supplies near the sea
surface
- slow process due to the time spent in sedimentary rock at the
bottom of the ocean
- theres no gaseous state so slow transport
- low water solubility

marine productivity: upwelling - Answer>> - ocean productivity
is highest in zones where upwelling occurs
- dead organic matter in the ocean tends to be denser than water
and sinks to the bottom of the ocean
- decomposition causes nutrients to accumulate in this cold, deep
water
- strong off shore winds blow across the ocean surface push
water away
- water irses from beneath the surfcae to replace the water that
was pushed away
vital for bringing nutrients back to the surface
- can occur in open oceans where deep water is forced up over
seamounts

, marine productivity: coastal areas - Answer>> - more
productive than the open ocean:
1. upwelling tends to be strongest at the coast (continental shelf
creates a ramp up which upwelling occurs)
2. rivers will pick up nutrients from runoff/leaching and carry them
into the sea which in turn fertilisers algal growth

marine productivity: variations in light levels: photic/aphotic zones
- Answer>> - light needed for photosynthesis
- light can penetrate through the photic zone

marine productivity: temperature - Answer>> - sunlight
penetration will influence the temperature of the ocean at
increasing depth
- highest temperature is in the photic zone
- temperature drops very rapidly
- higher temperature increase enzyme activity and promote
productivity
- warmer water is less dense and tends to float on the colder,
denser water below -- prevents nutrient mixing

tropical oceans - Answer>> -productivity limited in many areas
by lack of nutrients due to wind pattern influencing upwelling
- limiting factor is the nutrients
- lower biomass

temperate oceans - Answer>> - light intensity, water
temperatures and nutrient availability limiting
- summer brings higher light intensity and water temperatures
- seasons
- warmer seasons higher biomass
- increase in temperature and light intensity
- built up in nutrients

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller RevisionKing. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $7.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

80364 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$7.49
  • (0)
  Add to cart