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Flashcards in Conservation Deck (10)
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1
Q

What is biodiversity loss?

A

Global or local loss of genes, populations, species or ecosystems

Overall downward trend as a result of the human footprint.

2
Q

What is the benchmark for a mass extinction?

A

75% extinction over 2 million years.

Only one taxa is extinct, but there are large numbers for threats of extinction.

3
Q

Extinction rate vs magnitude?

A

Our current extinction rates are approaching the mass extinction rate.

Lower magnitude, but same rate!

4
Q

Causes and drivers of biodiversity loss?

A

Species risk of extinction doubles for mammals by 2060 due to human effects.

World human population growth - biggest driver.

Africa has the biggest biodiversity but also the largest human population growth - BIG THREAT.

Over consumption - meat production can’t increase at the same rate as the human population. Livestock also cause global warming.

Agriculture and logging are the biggest threat to mammals and birds.

Over exploitation - depletion of fisheries. Biomass of predatory fish in the 14 main fisheries have massively declined since commercial fishing started.

5
Q

What is the ecological footprint?

A

Global hectares required per person. Massively over-consuming in wealthy countries.

6
Q

Shark declines?

A

By 80%.

39 species are listed as endangered.

26-73 million sharks get harvested annually. They have a massive effect on their ecosystem so v bad.

7
Q

Effects of neonicotinoids?

A

Neurotoxins used as pesticides to limit arthropod pests and increase crop production.

However, thought to impact pollinators and be responsible for declines in bees, with
even sub-lethal doses thought to be harmful.

Bees are disoriented and can’t find their hives. EU has this year banned some use of the substance.

8
Q

Effects of fungi on amphibians?

A

Chytridiomycosis fungus affects amphibian skin - very sensitive to water loss. Affects their skin permeability to water.

Linked to dramatic declines/extinctions in W North America, Central America, South America, E Australia, E Africa

9
Q

Impacts of biodiversity loss?

A

Ecological collapse

Ecosystem services:

  • pollination: estimation of the worth of pollination by insect is about £440 m per annum in UK.
  • novel bio-pharmaceuticals: cone snails are threatened due to habitat degradation of coral reefs and mangroves. Conopeptides have potential use as analgesic medications. More effective than morphine but no addiction.
10
Q

Solutions to biodiversity loss?

A

Environmental policy - conventions and treaties. 1992.

Between 1900 and 2014, the number of designated protected areas rose from 13.4 million km^2 to 32 million. High proportion might not actually be protected.

Can connect protected areas with habitat corridors for large predators. Kavango-Zambezi Trans-frontier conservation area.