Biodiversity Under Climate Change: Biogeography, Prospects and Conservation Opportunities
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Biodiversity under climate change: biogeography, prospects and conservation opportunities Christopher John Wheatley PhD University of York Biology August 2018 Abstract Global climate change is one of the largest threats faced by biodiversity globally, with a wide range of impacts already observed and greater impacts projected to occur by the end of this century. Early identification of which species are most threatened by climate change is crucial to ensuring conservation action can be taken to prevent species losses. In this thesis I analyse the performance of a wide range of methodologies used to assess the risk to individual species from climate change, finding overall poor agreement between the different methods and validation using historic data sources demonstrated few were good predictors of climate change risk. A comprehensive trend-based climate change vulnerability assessment for European birds and butterflies was carried out, using the best performing methodology identified in this thesis. Differing patterns of climate change risk were identified for the two taxonomic groups, with a mix of risk and opportunities for birds but an overall substantially higher level of risk for butterflies. A large proportion of the species categorised as high climate risk are not of conservation concern currently and may be important targets for conservation intervention in the near future. Finally, a spatial prioritisation analysis for Europe identified where geographically the most important areas for conservation are located, and how the distribution of highest priority areas may change in the future. An examination of how the spatial scale at which conservation prioritisation is performed at can influence the effectiveness of the process found the currently used national scale approach within Europe is significantly less effective than either a full continental scale or a rescaled continental approach. Comparisons of these spatial prioritisations with the European protected area network show that under climate change existing sites are likely to become increasingly important in preventing the loss of species across the continent. 2 Contents Abstract ...................................................................................................... 2 Contents ..................................................................................................... 3 List of Tables .............................................................................................. 6 List of Figures ............................................................................................. 8 Acknowledgements................................................................................... 11 Declaration ............................................................................................... 13 Chapter 1 General Introduction .................................................................... 14 1.1 Global Climate Change ....................................................................... 15 1.2 Global Biodiversity Loss ..................................................................... 18 1.3 Vulnerability Assessments .................................................................. 19 1.4 Climate Change Vulnerability Assessments ....................................... 21 1.4.1 Components of climate change vulnerability ................................ 21 1.4.2 Assessment types ........................................................................ 22 1.4.3 Vulnerability assessment problems/limitations ............................. 24 1.5 Spatial prioritization ............................................................................ 27 1.6 Thesis aims and rationale ................................................................... 31 Chapter 2 Climate change vulnerability for species – assessing the assessments ................................................................................................ 33 2.1 Abstract .............................................................................................. 34 2.2 Introduction ......................................................................................... 35 2.3 Methods .............................................................................................. 39 2.3.1 Exemplar and real species comparisons ...................................... 39 2.3.2 Simulated species comparisons ................................................... 40 2.3.3 Validation ...................................................................................... 42 2.3.4 Statistical analysis ........................................................................ 44 3 2.4 Results ................................................................................................ 46 2.4.1 Consistency between the results of different vulnerability ............ 46 2.4.2 Validation of different vulnerability frameworks ............................ 53 2.4.3 Validation using an ensemble approach ....................................... 53 2.5 Discussion .......................................................................................... 58 2.5.1 Assessment comparisons and validation ...................................... 58 2.5.2 Consensus assessment approach ............................................... 59 2.5.3 Validation analysis limitations ....................................................... 60 2.5.4 Future climate vulnerability assessment use ................................ 61 Chapter 3 Extinction risks and conservation opportunities for European biodiversity under climate change ................................................................ 63 3.1 Abstract .............................................................................................. 64 3.2 Introduction ......................................................................................... 65 3.3 Methods .............................................................................................. 68 3.3.1 Climate Change Vulnerability Assessment ................................... 68 3.3.2 Species Distribution Modelling ..................................................... 69 3.3.3 Spatial prioritisation ...................................................................... 71 3.3.4 Statistical Analysis ........................................................................ 72 3.4 Results ................................................................................................ 73 3.4.1 Climate change vulnerability assessment ..................................... 73 3.4.2 Red List comparison ..................................................................... 77 3.4.3 Spatial Prioritization ...................................................................... 79 3.5 Discussion .......................................................................................... 83 Chapter 4 National vs Continental scale spatial conservation prioritisation for Europe ......................................................................................................... 86 4.1 Abstract .............................................................................................. 87 4 4.2 Introduction ......................................................................................... 88 4.3 Methods .............................................................................................. 91 4.3.1 Species Distribution Modelling ..................................................... 91 4.3.2 Spatial Prioritisations .................................................................... 93 4.3.4 Effectiveness of prioritisation ........................................................ 95 4.3.4 Protected Areas ............................................................................ 96 4.3.5 Statistical Analysis ........................................................................ 97 4.4 Results ................................................................................................ 98 4.4.1 Spatial similarities and differences between approaches ............. 98 4.4.2 Species representation and the Aichi targets ............................. 101 4.4.3 Similarities of prioritisation approaches under climate change ... 107 4.4.4 Existing conservation provision and climate change impacts ..... 110 4.5 Discussion ........................................................................................ 111 Chapter 5 General Discussion ................................................................... 115 5.1 Summary of thesis findings ............................................................... 116 5.2 Biodiversity conservation in a changing climate ............................... 119 5.3 Uncertainty in biodiversity conservation under climate change ........ 121 5.4 Climate change vulnerability assessment limitations ........................ 125 5.6 Recommendations for conservation and future research ................. 128 5.7 Concluding remarks .......................................................................... 131 Appendix .................................................................................................... 133 References................................................................................................. 185 5 List of Tables Table 2.1: Summary vulnerability framework information. Overall vulnerability equation used by each framework, broad methodology type, taxonomic group(s) used to test the framework, and geographic scale at which the framework