THE THEMATIC ASSESSMENT REPORT ON INVASIVE ALIEN SPECIES AND THEIR CONTROL
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effectiveness of management actions across scales and in 
various contexts. The Invasive Alien Species Assessment 
finally outlines key responses and policy options for the 
prevention, early detection, and effective control of invasive 
alien species and mitigation of their impacts in order to 
safeguard nature, nature's contributions to people and good 
quality of life.
The Invasive Alien Species Assessment highlights that 
invasive alien species are a major and growing threat to 
nature, nature's contributions to people, with, in some cases, 
irreversible changes to biodiversity and ecosystems. Invasive 
alien species also dramatically impact the economy, food 
security, water security and human health, sometimes adding 
to marginalization and inequity. The Assessment demonstrates 
that with sufficient resources, political will, and long-term 
commitment, preventing and controlling invasive alien species 
are attainable goals that will yield significant long-term benefits 
for people and nature.
As the Chair and the Executive Secretary of IPBES, we wish 
to recognize the leadership and dedication of the co-chairs, 
Prof. Helen Roy (United Kingdom), Prof. Anibal Pauchard 
(Chile), and Prof. Peter Stoett (Canada) and the hard work and 
commitment of all the coordinating lead authors, lead authors, 
review editors, fellows, contributing authors and external 
reviewers, and to warmly thank them for contributing their time 
and ideas freely to this important report. We would also like to 
recognize the hard work and dedication of Naoki Amako and 
Noriko Moriwake, heads of the technical support unit for this 
Assessment, Tanara Renard Truong, assessment coordinator, 
and Ryoko Kawakami, administrative officer. Our thanks go 
also to the current and former members of the Multidisciplinary 
Expert Panel (MEP) and of the Bureau who provided guidance 
as part of the management committee for this report, and 
to members of the IPBES secretariat including those of 
other technical support units within the IPBES secretariat, 
who have supported the production of this report, and its 
successful launch in the media. We would also like to thank all 
Governments and other institutions that provided financial and 
in-kind support for the preparation of this Assessment. We are 
profoundly aware that work was made more challenging over 
the past couple of years because of the COVID-19 pandemic 
which prevented the experts from meeting and connecting 
in-person as planned, and which created very difficult personal 
circumstances for many. We express again our deepest 
thanks and recognition to all involved, on behalf of IPBES.
The Invasive Alien Species Assessment provides the 
best-available evidence, critical analysis and options for 
governments, civil society, Indigenous Peoples and local 
communities, the private sector and all those seeking to 
address the issue of biological invasions. The Assessment is 
also expected to support sharing of information within and 
across countries and capacity building globally. It is our sincere 
hope that this Assessment will support the implementation 
of the Sustainable Development Goals of the 2030 Agenda 
for Sustainable Development (especially Goal 15) and form a 
significant contribution to the implementation of the KunmingMontreal Global Biodiversity Framework of the Convention on 
Biological Diversity, and especially of its Target 6.
Ana Maria Hernandez Salgar
Chair of IPBES (2019-2023) 
Anne Larigauderie
Executive Secretary of IPBES
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The thematic assessment report on
INVASIVE ALIEN SPECIES
AND THEIR CONTROL
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