Comparing biodiversity offset calculation methods with a case study in Uzbekistan

Biodiversity offsets are interventions that compensate for ecological losses caused by economic development, seeking ‘no net loss’ (NNL) of biodiversity overall. Calculating the ecological gains required to achieve NNL is non-trivial, with various methodologies available. To date, there has been no comparison among methodologies for a common case study. We use data on industrial impacts in Uzbekistan to provide such a comparison. We quantify losses from 40 years of gas extraction, using empirical data on vegetation impacts alongside estimates of disruption to mammals. In doing so, we implement a novel technique by estimating spatial ‘functional forms’ of disturbance to calculate biodiversity impacts. We then use a range of offset methodologies to calculate the gains required to achieve NNL. This allows a crude comparison of the potential biodiversity outcomes of ‘‘in kind’’ offsets (here, vegetation restoration) with ‘‘out of kind’’ offsets (protecting fauna from poaching). We demonstrate that different methods for calculating the required offset activities result in divergent outcomes for biodiversity (expressed in habitat condition x area, or ‘weighted area’), and different trajectories in biodiversity outcomes over time. An Australian method is currently being considered for adoption in Uzbekistan, but we show that it would require careful adjustments to achieve NNL there. These findings highlight that the method used to quantify losses and gains strongly influences the biodiversity outcomes of offsetting, implying that offsets generated using different methodologies are not transferable between jurisdictions. Further, conservation gains from out of kind offsets may outweigh those from strict in kind NNL interpretations. 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://

[1]  J. Fisher,et al.  Oil and gas development in the World Heritage and wider protected area network in sub-Saharan Africa , 2011, Biodiversity and Conservation.

[2]  Navinder J. Singh,et al.  Saiga antelope calving site selection is increasingly driven by human disturbance , 2010 .

[3]  T. Gardner,et al.  Biodiversity Offsets and the Challenge of Achieving No Net Loss , 2013, Conservation biology : the journal of the Society for Conservation Biology.

[4]  Navinder J. Singh,et al.  Conservation when nothing stands still: moving targets and biodiversity offsets , 2013 .

[5]  E J Milner-Gulland,et al.  Importance of Baseline Specification in Evaluating Conservation Interventions and Achieving No Net Loss of Biodiversity , 2014, Conservation biology : the journal of the Society for Conservation Biology.

[6]  J. Kiesecker,et al.  Policy Development for Biodiversity Offsets: A Review of Offset Frameworks , 2010, Environmental management.

[7]  Mark Botha,et al.  Biodiversity offsets: adding to the conservation estate, or ‘no net loss’? , 2009 .

[8]  David Cheal,et al.  Assessing the quality of native vegetation: The 'habitat hectares' approach , 2003 .

[9]  Mark A. Burgman,et al.  Treatment of uncertainty in conservation under climate change , 2013 .

[10]  A. Purvis,et al.  Getting the measure of biodiversity , 2000, Nature.

[11]  R. Alkemade,et al.  The impacts of roads and other infrastructure on mammal and bird populations: a meta-analysis. , 2010 .

[12]  Mark A. Burgman,et al.  Methods for allocation of habitat management, maintenance, restoration and offsetting, when conservation actions have uncertain consequences , 2012 .

[13]  Deborah S. Bower,et al.  Achieving no net loss in habitat offset of a threatened frog required high offset ratio and intensive monitoring , 2013 .

[14]  R. Julliard,et al.  Sustain common species and ecosystem functions through biodiversity offsets: response to Pilgrim et al. , 2013 .

[15]  David B. Lindenmayer,et al.  Faustian bargains? Restoration realities in the context of biodiversity offset policies , 2012 .

[16]  Navinder J. Singh,et al.  Biodiversity offsets in theory and practice , 2013, Oryx.

[17]  E. Milner‐Gulland,et al.  The ecology and management of the Saiga antelope in Kazakhstan , 1998 .

[18]  E. Milner‐Gulland,et al.  Quantifying habitat impacts of natural gas infrastructure to facilitate biodiversity offsetting , 2013, Ecology and evolution.

[19]  G. Gintzburger,et al.  A SIMPLE SINGLE DISC PITTING AND SEEDING MACHINE FOR ARID RANGELAND REVEGETATION , 1985 .

[20]  Thomas J. Habib,et al.  Economic and Ecological Outcomes of Flexible Biodiversity Offset Systems , 2013, Conservation biology : the journal of the Society for Conservation Biology.

[21]  E. Milner‐Gulland,et al.  The role of saiga poaching in rural communities: linkages between attitudes, socio-economic circumstances and behaviour. , 2009 .

[22]  Ascelin Gordon,et al.  Assessing the impacts of biodiversity offset policies , 2011, Environ. Model. Softw..

[23]  Fabien Quétier,et al.  Assessing ecological equivalence in biodiversity offset schemes: Key issues and solutions , 2011 .

[24]  P. Micklin.  The Aral Sea Disaster , 2007 .

[25]  A. Clevenger,et al.  Oyu Tolgoi Roads and Wildlife Mitigation Report , 2013 .