Question 1

What is the Holocene extinction and why is it called the Anthropocene?

Accepted Answer

The Holocene extinction is the sixth mass extinction event in Earth's history, currently in progress. Unlike previous extinctions caused by natural events, this one is attributed to human activities, leading scientists to provisionally call it the Anthropocene. The explosion of the human population—reaching 7.7 billion in 2019—drives habitat loss, overexploitation, invasive species introduction, and climate change.

Question 2

How does habitat loss from deforestation threaten biodiversity?

Accepted Answer

Deforestation and land transformation for agriculture push species into smaller, fragmented home ranges with fewer resources and increased survival challenges. This human activities and habitat fragmentation reduces available space and isolates populations, making species more vulnerable to extinction and preventing natural migration patterns essential for species survival and ecosystem balance.

Question 3

What role do invasive species play in biodiversity loss?

Accepted Answer

Invasive species drastically alter ecosystems by outcompeting native species for resources and preying on them. Without natural predators to control their populations, invasive species cause rapid declines in biodiversity. Their introduction represents a major threat alongside habitat loss and climate change in driving current extinction rates.

Question 4

How does global climate change reduce habitable space for species?

Accepted Answer

Rising average global temperatures from increased carbon dioxide and greenhouse gas emissions decrease habitable space for many species and alter migratory and seasonal activity patterns. These global climate change effects disrupt ecosystems by making traditional habitats unsuitable, forcing species to relocate or face extinction if they cannot adapt quickly enough.

Question 5

Why is overexploitation of species a major biodiversity threat?

Accepted Answer

Many species used for food and medicine are harvested beyond their reproductive capacity due to high economic demand. This overexploitation prevents populations from recovering, leading to species decline and potential extinction. The mismatch between harvest rates and reproductive rates creates unsustainable pressure on vulnerable species populations.

Question 6

What does the Yellowstone wolf reintroduction reveal about apex predators?

Accepted Answer

Wolf reintroduction to Yellowstone correlates with rebounding Aspen tree populations, suggesting apex predators are essential to ecosystem biodiversity. When wolves were removed, prey populations increased and overgrazed young Aspen saplings, causing tree decline, erosion, and habitat loss for other species. This demonstrates how top predators maintain ecological balance.

Question 7

How can sustainable development help balance human needs with biodiversity conservation?

Accepted Answer

Sustainable development and management of ecosystems requires planning that accounts for biodiversity loss while meeting human resource needs. The Dust Bowl case study shows that poorly planned agriculture without native ground cover caused ecological collapse. Balancing civilization's progress with conservation strategies protects both current biodiversity and future generations' access to ecosystem services.

Minacce alla biodiversità

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