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Carbon-focused conservation may fail to protect the most biodiverse tropical forests

Ferreira, J and Lennox, GD and Gardner, TA and Thomson, JR and Berenguer, E and Lees, Alexander and Mac Nally, R and Aragão, LEOC and Ferraz, SFB and Louzada, J and Moura, NG and Oliveira, VHF and Pardini, R and Solar, RRC and Vieira, ICG and Barlow, J (2018) Carbon-focused conservation may fail to protect the most biodiverse tropical forests. Nature Climate Change, 8. p. 744. ISSN 1758-678X

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Abstract

As one of Earth’s most carbon-dense regions, tropical forests are central to climate change mitigation efforts. Their unparalleled species richness also makes them vital for safeguarding biodiversity. However, because research has not been conducted at management-relevant scales and has often not accounted for forest disturbance, the biodiversity implications of carbon conservation strategies remain poorly understood. We investigated tropical carbon–biodiversity relationships and trade-offs along a forest-disturbance gradient, using detailed and extensive carbon and biodiversity datasets. Biodiversity was positively associated with carbon in secondary and highly disturbed primary forests. Positive carbon–biodiversity relationships dissipated at around 100 MgC ha–1, meaning that in less disturbed forests more carbon did not equal more biodiversity. Simulated carbon conservation schemes therefore failed to protect many species in the most species-rich forests. These biodiversity shortfalls were sensitive to opportunity costs and could be decreased for small carbon penalties. To ensure that the most ecologically valuable forests are protected, biodiversity needs to be incorporated into carbon conservation planning.

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