Second level Third level Identifying Algae Activity Fourth

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ALGAE DIVERSITY Scientists estimate there are somewhere between 30 000 to 1 000 different

ALGAE DIVERSITY Scientists estimate there are somewhere between 30 000 to 1 000 different species of algae You are here (humans occupy just one branch) Every branch on the tree of life with a red dot represents a family containing an algae species

IDENTIFYING ALGAE Scientists need a way to identify the different species of algae -

IDENTIFYING ALGAE Scientists need a way to identify the different species of algae - especially if they want to use them for biotechnology applications. They do this in one of two ways. Using DNA analysis in the lab Visual identification under the microscope using a Dichotomous Key

DICHOTOMOUS KEY • Dichotomous means ‘split into two parts’ • A dichotomous key is

DICHOTOMOUS KEY • Dichotomous means ‘split into two parts’ • A dichotomous key is a stepwise series of statements or questions that have either a yes or no answer. • Depending on the response, you will move to another question, and eventually make your way down the list until you reach your answer. • Dichotomous keys are a fast, costeffective method for identification when scientists are conducting fieldwork.

EXAMPLE

EXAMPLE

ACTIVITY INSTRUCTIONS STEP ONE: Download or open the Amazing Algae Activity Worksheet STEP TWO:

ACTIVITY INSTRUCTIONS STEP ONE: Download or open the Amazing Algae Activity Worksheet STEP TWO: Work through each image and identify the algae based upon its visual features using the Dichotomous Key

Algae A FUN FACT When added to cattle feed, this algae has been shown

Algae A FUN FACT When added to cattle feed, this algae has been shown to reduce the methane emissions of a burping cow by up to 80% 1 cm

Algae B 100 μm

Algae B 100 μm

Algae C FUN FACT This algae can be found both in aquatic environments as

Algae C FUN FACT This algae can be found both in aquatic environments as well as in soil and is often referred to as witch’s jelly or star slime 10 μm

Algae D 5 μm

Algae D 5 μm

FUN FACT This algae is most often found in tropical reef ecosystems and is

FUN FACT This algae is most often found in tropical reef ecosystems and is commonly referred to as Sea Pearls or Sailor’s Eyeballs 1 cm Algae E

Algae F 5 μm

Algae F 5 μm

Algae G FUN FACT 2 μm This algae has a hard, glass-like cell wall

Algae G FUN FACT 2 μm This algae has a hard, glass-like cell wall made from silica and there can be as many as ten million of them in just 1 L of seawater!

Algae H m 10 c

Algae H m 10 c

ALGAE IMAGE CREDITS 1. 2. 3. 4. 5. 6. 7. 8. Damsea/Shutterstock F. Neidl

ALGAE IMAGE CREDITS 1. 2. 3. 4. 5. 6. 7. 8. Damsea/Shutterstock F. Neidl – Shutterstock Elif Bayraktar – Shutterstock Apichan Thongkrajang – Shutterstock Damsea – Shutterstock Maple Ferryman – Shutterstock Jubal Harshaw – Shutterstock Ethan Daniels - Shutterstock

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