Andes of South America are world’s biodiversity champion says news study
Rhett A. Butler, mongabay.com
August 18, 2005
Currently there are three “competitive” maps of the world’s biodiversity hotspots based on different criteria:
- areas rich in species diversity in general;
- threatened species specifically; and
- endemic species, which have a limited habitat.
A new study, based on bird distribution and detailed below, found that these three maps share only 2.5% of their total area, thus adding confusion to what hotspots should be priorities for conservation efforts. The overlap all occurs in the Andean region of South America, implying that this area is the world’s biodiversity champion when it comes to birds. South America is home to more than 3400 of the world’s 10,000 bird species.
Conservation International, a leading conservation organization, sponsors a web site on Global biodiversity hotspots, the richest and most threatened reservoirs of plant and animal life on Earth.
New global bird map suggests ‘hotspots’ not a simple key to conservation
Imperial College London release
The first full map of where the world’s birds live reveals their
diversity ‘hotspots’ and will help to focus conservation efforts,
according to research published in Nature today (18 August).
The findings are drawn from the most complete and detailed picture of
bird diversity yet made, based on a new global database of all living
The map also shows that the pattern of bird diversity is much more
complicated than previously thought.
The researchers conclude that different types of ‘hotspot’ – the most
bird-rich locations on the planet — do not share the same geographic
distribution, a finding with deep implications in both ecology and
For birds, hotspots of species richness are the mountains of South
America and Africa, whereas hotspots of extinction risk are on the
islands of Madagascar, New Zealand and the Philippines.
“In the past people thought that all types of biodiversity showed the
same sort of pattern, but that was based on small-scale analyses,” says
senior author Professor Ian Owens of Imperial College London. “Our new
global analyses show that different sorts of diversity occur in very
Biodiversity hotspots have a high profile in conservation, but are
controversial as their underlying assumptions remain untested. The key
assumption is that areas ‘hot’ for one aspect of diversity will also be
hot for other aspects.
Their analyses now show that surprisingly, this is not the case –
different types of hotspot are in fact located in different areas.
“Different types of diversity don’t map in the same way,” Prof Owens
says. “There is no single explanation for the patterns. Different
mechanisms are therefore responsible for different aspects of
biodiversity, and this points to the need to base conservation strategy
on the use of more than one measure of biodiversity.”
The team mapped three different measures of diversity for the study:
species richness, threatened species richness (as assessed by their
extinction risk), and endemic species richness (birds with a small
breeding range). Only the Andes in South America contains bird hotspots
under all three measures.
To understand the mechanisms behind large scale biodiversity patterns,
the researchers first had to construct global maps before delving into
“The prior bits of work were horribly dispersed: in paper maps on
expert’s desks, or in very old books and the heads of aging experts who
had originally surveyed the areas,” said Professor Owens.
It took five person years to get the data into a digital mapping format
known as a ‘GIS system’. This database was then used to score the
presence or absence of each of the nearly 10,000 different bird species
in a grid covering the world’s land area. Each of the 20,000 cells in
the grid is 100 km squared and contains an area similar to that of
“We hope that birds are a model for this type of work,” said Professor
Owens. “There is such a wealth of historical information about them.
They are also large, colourful and you can see them in the day time.
It’s very difficult to do at this scale for other organisms.”
The study is the result of a new form of ecological funding – a Natural
Environment Research Council Consortium Grant. These grants encourage
large-scale work and this was the first to be awarded, shared between
Imperial College London, the Institute of Zoology, and the Universities
of Sheffield and Birmingham. The next stages of the consortium work,
following the mapping, are to develop ecological and evolutionary
explanations for the bird diversity.
Notes to Editors:
This research is published in Nature (18 August 2005).
Title: Global hotspots of species richness are not congruent with
endemism or threat
Authors: C. David L. Orme1, Richard G. Davies3, Malcolm Burgess1, Felix
Eigenbrod1, Nicola Pickup1, Valerie A. Olson4, Andrea J. Webster5,
Tzung-Su Ding6, Pamela C. Rasmussen7, Robert S. Ridgely8, Ali J.
Stattersfield9, Peter M. Bennett4, Tim M. Blackburn5, Kevin J. Gaston3
and Ian P. F. Owens1,2
1 Division of Biology
2 NERC Centre for Population Biology, Imperial College London, Silwood
Park, Ascot, Berkshire SL5 7PY, UK
3 Biodiversity and Macroecology Group, Department of Animal and Plant
Sciences, University of Sheffield, Sheffield S10 2TN, UK
4 Institute of Zoology, Zoological Society of London, Regent’s Park,
London NW1 4RY, UK
5 School of Biosciences, University of Birmingham, Edgbaston, Birmingham
B15 2TT, UK
6 School of Forestry and Resource Conservation, National Taiwan
University, 1, Sec 4, Roosevelt Road, Taipei 106, Taiwan
7 Michigan State University Museum and Department of Zoology, West
Drive, East Lansing, Michigan 48824-1045, USA
8 Academy of Natural Sciences, 1,900 Benjamin Franklin Parkway,
Philadelphia, Pennsylvania 19103, USA
9 BirdLife International, Wellbrook Court, Girton, Girton Road,
Cambridge, CB3 0NA, UK
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