Tool Chapter 6 Practical 5 Quantifying species loss tool

📉 Species Extinction Rate Calculator

Chapter 6 Practical 5: Quantifying Species Loss Across Different Time Periods

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Sixth Mass Extinction Alert
Current extinction rates are 100x higher than the natural background rate. This tool helps quantify the crisis using E/MSY metrics.

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E/MSY Formula

E/MSY = (E / (S × T)) × 10⁶

Where:
E = Number of extinctions
S = Total number of species
T = Time period in years
10⁶ = Standardization factor (per million)

Background Rate: The natural baseline extinction rate for mammals is approximately 1 E/MSY (0.1 - 1.0 range). This represents the normal turnover of species without human influence.

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Period Data Input

Pre-1500 (Background) Baseline

Background Rate (E/MSY)

Please enter a valid background rate between 0.1 and 2.0

1500 - 1900 (Early Modern) Historical

Extinctions

Please enter a valid number of extinctions

Total Species

Please enter a valid number of species

Time Period (years)

Please enter a valid time period

1900 - Present (Modern) CRITICAL

Extinctions

Please enter a valid number of extinctions

Total Species

Please enter a valid number of species

Time Period (years)

Please enter a valid time period

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Calculation Results

Background Rate

1.0

E/MSY

Early Modern Rate

14.5

E/MSY

15x background

Modern Rate

107.9

E/MSY

108x background

Key Finding

The modern extinction rate is 108 times higher than the natural background rate.

This indicates we are in the Sixth Mass Extinction (Anthropocene extinction), driven primarily by human activities including habitat destruction and overexploitation.

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Visualization

Note: The logarithmic scale view helps visualize the massive difference between background and modern rates that would otherwise be invisible on a linear scale.

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Primary Drivers (1900-Present)

🏗️ Habitat Loss 40%

🏹 Overexploitation 30%

🌡️ Climate Change 10%

🦎 Invasive Species 10%

🏭 Pollution 10%

Why This Matters

• 100x+ background rate indicates mass extinction event
• Habitat loss is the #1 driver (agriculture, urbanization)
• Rates likely underestimated (invertebrates, plants under-recorded)
• Urgent conservation policy needed based on these metrics

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Period Comparison Summary

Time Period	Duration	Extinctions	Rate (E/MSY)	vs Background	Primary Driver
Pre-1500	Millions of years	Natural turnover	~1.0	1x (Baseline)	Natural selection, climate
1500-1900	400 years	32	14.5	15x	Colonization, early agriculture
1900-Present	123 years	73	107.9	108x	Industrialization, habitat loss

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Viva Voce Preparation

What does E/MSY stand for and why is it used?

Extinctions per Million Square Yards - used for habitat measurement

Extinctions per Million Species-Years - standardizes rate for comparison

Endangered Mammal Species Yesterday - tracks recent extinctions only

Ecological Management System Yield - measures conservation success

What is the significance of 100x background extinction rate?

It indicates normal evolutionary turnover

It defines a mass extinction event (Sixth Extinction)

It shows conservation efforts are working

It represents a statistical error

Why use a logarithmic scale for visualization?

To make the graph look more scientific

To visualize massive differences between periods clearly

Because linear scales are prohibited in ecology

To hide the true extent of extinction

What is the Anthropocene?

A dinosaur extinction event

Current geological epoch dominated by human impact

The background extinction period

A conservation organization

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