Statistics Flashcards
What percentage of endangered terrestrial vertebrates are
threatened with habitat loss
c. 80% of endangered terrestrial vertebrates
threatened with habitat loss
How many tree species can one hectacre contain in the tropics?
1 hectare can have 650 tree species
What percentage of forest were logged between 2000-2005?
Between 2000-2005, 20% of tropical forests were logged
(e.g. Asner e
How many hectares are in permanent timber estates?
400 million hectares are in permanent timber estates
What percentage of the Amazon is within 12km of a road?
90 % of the Amazon is within 12km of a road
50% is within 3km
25% within 1km
How many million mammals are hunted a year?
15 million for subsidence
How many of the species we know of are traded?
25% of the vertebrates we know of are traded
45% of birds
How much will food production grow by in 40 years?
In the next 40 years, agricultural production could grow by 60–100%
What percentage of data deficient species are likely to be threatened?
64% of DD terrestrial mammals predicted to be
threatened
How many people depend on fish for protein?
c.1.5bn people with around 20% of their per
capita intake of animal protein
400 million poor people depend critically on fish
for their food, particularly in small island developing
states, Bangladesh, and Ghana
How many boats are there?
The total number of fishing vessels in the world in 2020
was c.4.1 million
• 2/3 of the global fleet is in Asia
• Motorized vessels represented 62% (2.5M) of all fishing
vessels in 2020
• Small vessels dominate in all regions: c.81% of global
motorized fishing vessels in 2020 were <12 m in length,
mostly undecked
• Vessels >24 m make up <5% of the total fleet
source: FAO SOFIA 2022, https://www.fao.org/3/cc0461en/online/sofia/20
Fish
n 2020, 44% of fish for direct human consumption was
live, fresh or chilled
• Common processing methods include freezing,
preserving and curing, but this requires additional
infrastructure
• In developing countries, capacity for preservation is low,
and most (70%) fish are sold live, fresh, or chilled
• Up to 35% of global fisheries production is lost or wasted
due to inadequate preservation and infrastructure (in
poorer countries) or at the consumption stage (in richer
countries)
How much fish do we eat?
Currently around 89% of fisheries production is directly
consumed by people, cf. 67% in the 1960s
Anchoveta are used to feed livestock
o obtain a similar quantity of meal from soy beans would
require 60,000km2 additional tropical agriculture
rawl gears removed 6–41% of faunal biomass per pass
• Recovery times post trawling were 1.9–6.4 y
• Otter trawls caused the least depletion, removing 6% of biota
per pass and penetrating the seabed on average down to 2.4
cm
• Hydraulic dredges caused the most depletion, removing 41%
of biota and penetrating the seabed on average 16.1 cm
