ALTER-Net Policy Brief on ecosystem services and biodiversity -- Research needs for the sustainable governance of ecosystem services and biodiversity -- Biodiversity and ecosystems provide a broad range of goods and services and form the basis for the subsistence and well-being of humans and their societies. During 2010 there was a strong policy shift towards the joint protection of biodiversity and ecosystem services. Behind these policies lies the idea that biodiversity and ecosystem services can be jointly protected and managed in ways that contribute to sustainability, human well-being and poverty eradication. However, the knowledge needed to make this a reality is far from fully developed. This briefing note summarises the main conclusions from two meetings organised by ALTER-Net, and lists what we feel are the main research priorities.