 |
|
Doug
Butterworth
|
|
Doug
Butterworth, University of Cape Town, made a presentation on dynamics of
renewable species populations and applicability to Appendix listing. He
outlined references used in commercial fisheries analysis to study species
dynamics, including the optimal utilization theory and explained the link
between biological over exploitation and maximum sustainable yield (MSY)
in ensuring sustainable harvest. He suggested species faced with the
threat of extinction or “depensation” (reduction of population due to
low annual growth rate not necessarily linked to human exploitation) could
qualify for Appendix I listing whereas species not faced with depensation
but below MSY levels could qualify for Appendix II listing. He said
species eligible for sustainable harvest should be monitored and listed in
Appendix II if their population decreased. Listen
to the RealAudio |
|
Willem Wijnstekers with John Field,
Biologist with the USFWS Scientific Authority
|
Image of the overhead display used by Pamela
Mace
|
|
On
encouraging parties to factor in quantitative analyses when proposing
species for listing, Kevern Cochrane, FAO supported the use of the
best scientific information based on available data (both quantitative
and qualitative)
|
Jabatan Perhutanan, Forestry Department Peninsula, Malaysia (left), in
discussion with fellow delegate, N.P. Singh, Botanical Survey of
India
|
|
Harald
Martens, Germany, challenged the applicability of Butterworth’s
conceptual model to species other than fish |
|
|
Pamela
Mace
|
Pamela
Mace, US National Marine Fisheries Service, linked listing criteria
and the viability of marine species. She highlighted that the
conceptual framework could be applicable to other species. She spoke
of repercussions of commercial exploitation on marine and other
organisms and their capacity to rebound and recolonize and noted
irreversible habitat changes are less prevalent in the marine
environment. She said the extent of decline of a population should be
the ultimate criterion for Appendix listing but demonstrated
situations where the rate of decline may be indicative of listing
necessity, including where the species� decline is still occurring.
She
also addressed: application of different criteria for different life
histories or taxonomic groupings; combining productivity, historical
extent of decline and recent rate of decline; and usefulness of
numeric guidelines.
Regarding
definitions and guidelines for listing, she called for: placing more
emphasis on the extent of decline; relating minimum population numbers
to life histories or taxonomic groupings; varying numeric guidelines
for decline criteria with productivity; and using generation time to
index productivity. Listen
to the RealAudio. |
|
Commenting
on Pamela Mace�s presentation on the criteria and viability of
marine species, Patricia D�vila, Mexico, noted the absence of readily
available historical information, particularly for plant species, and
said qualitative data must be defined and used in a viable framework.
|
Patricia D�vila
|
|
Ronald
Orenstein
|
Regarding
the four biological criteria for listing in Appendix I, debate arose
over language qualifying individuals as �mature�. Ronald
Orenstein, IWC, questioned the use of the term mature, using the
example of the Philippine Cockatoo, which has many mature
individuals but low recruitment. |
|
Referring
to the IUCN formal definition, Alison Rossner, IUCN, said �mature
individuals� are those known or inferred to be able to reproduce
|
Alison
Rosser
|
|
Marinus
Hoogmoed, the Netherlands, Chair of the Animals Committee (left), Rod
Hay, Oceania representative for the Animals Committee in the CWG
(center) and Greg Leach, Oceania representative for the Plants
Committee in the CWG.
Picture opposite >>
|
|
|
John Donaldson
|
Regarding
biological criteria for Appendix I listing, John Donaldson, Africa
representative for the Plants Committee in the CWG, supported
rephrasing the reference to mature individuals concentrated in one
sub-population. He suggested alternative language that highlights
the number of individuals critical to different life history phases
and to the continuance of the species. |
|
Chidziya Edson, Department of National Parks and Wildlife
Management, Zimbabwe with Juma Kayera, Wildlife Division, CITES
Management Authority, Ministry of National Resources and Tourism,
Tanzania and Jaques Berney, World Conservation Trust (IWMC)
|
Violette Lacloche, ENB, and Doug Butterworth in conversation
|
|
Displays
showcasing local culture and ecology and national conservationists |
<<
Back to main page <<
Second Joint Meeting of the Animals and Plants Committees,
homepage.
General Information from the CITES website.
ENB's coverage of CITES COP-11
Agenda of the Plants Committee.
Agenda
of the Animals Committee.
CITES homepage.
Traffic.org
|
