The Plankton Police A body has been washed ashore. How could I help the police to decide if it was drowned or if the body was dumped in the sea after.

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The term plankton is applied to those organisms that are the drifters of the sea.

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Presentation transcript:

The Plankton Police A body has been washed ashore. How could I help the police to decide if it was drowned or if the body was dumped in the sea after death? DO NOT TELL THEM THE ANSWER.

All will be able to complete a sample tally and interpret some results. Most will be able to differentiate between high and low biodiversity, and give reasons for its importance. Some will be able to define the term biodiversity and describe how it is maintained.

Key Words biodiversity habitat species Tally Sampling

What are Plankton? Plankton are amongst some of the tiniest living organisms found in our oceans but they are arguably the most important. They are divided into two groups: Phytoplankton and Zooplankton

Why are plants so important? Phytoplankton Phytoplankton are tiny plants. Why are plants so important?

These are some of the creatures that feed on phytoplankton

Tiny plant eaters - zooplankton These are tiny microscopic animals that also eat phytoplankton. The are the main food source for lots of other sea creatures. Some organisms are permanently part of the Zooplankton. Some are larvae that grow into larger organisms like crabs. Pictures are Herring, Shrimp and Krill

Aim- To measure the biodiversity of Southampton Water Using a petri dish quadrat to sample

Instructions You need to pour a fixed amount of sample water (collected on the trip) onto your dish. Carefully place it under the microscope and find square 1 under low power. You need to count the number of each species you see in that square and write it in your table. Repeat the process until you have counted species in every square.

What to count…. Chain Diatom Barnacle larvae Egg capsule Copepods Sea squirt They will see other plankton but it easier for them to count six types only. Note the egg capsule is very large and looks like a fried egg. Diatoms

Which type of plankton is the most common Which type of plankton is the most common? Is it a phytoplankton or a zooplankton? How do you know?

Can you estimate how much plankton you would drink if you gulped whilst swimming in the sea? The total number of plankton in my ____ml sample was…. The average person’s mouth can hold 120ml of water. This means I could swallow……

Can you improve your answer? A body has been washed ashore. How could I help the police to decide if it was drowned or if the body was dumped in the sea after death?