[Show abstract][Hide abstract] ABSTRACT: Reports Continued degradation of the natural world and the goods and services it provides to humankind has led to the adoption of numerous international agreements aimed at halting the decline of biodiversity and ecosystem services [e.g., (1)]. The Parties to the Convention on Biological Diversi-ty (CBD) in 2002 committed to a significant reduction in the rate of biodiversity loss by 2010 (2), which, despite some local successes [e.g. (3)], did not lead to a reduction in the overall rate of decline (4, 5). Re-newed commitments were made in the Strategic Plan for Biodiversity 2011–2020 (6), which calls for effective and urgent action this decade. These goals are supported by 20 "Aichi Biodiversity Targets" to be met by 2020 at the latest (table S1), covering "pressures" on, "states" of, and "benefits" from biodiversity and "responses" to the biodiversity crisis [sensu (4, 7); table S2]. Objectively quantifying progress toward these international environmental commitments is critical for assessing their impact and efficacy, yet as the mid-point of this 10-year period ap-proaches, progress toward the Aichi Targets has not been quantitatively evaluated. To address this gap, we assembled a broad suite of indicator varia-bles to estimate historical trends and project to 2020 (8). Building on the CBD's indicative list (9), we performed a data scoping of more than 160 potential indicators and reviewed them against five criteria for inclusion, namely: (i) high relevance to a particular Aichi Target and a clear link to the status of biodiversity; (ii) scientific or institutional credibility; (iii) a time series ending after 2010; where unavailable but indicator fills a CONSERVATION TARGETS
[Show abstract][Hide abstract] ABSTRACT: In 2010 the international community, under the auspices of the Convention on Biological Diversity, agreed on 20 biodiversity-related “Aichi Targets” to be achieved within a decade. We provide a comprehensive mid-term assessment of progress toward these global targets using 55 indicator data sets. We projected indicator trends to 2020 using an adaptive statistical framework that incorporated the specific properties of individual time series. On current trajectories, results suggest that despite accelerating policy and management responses to the biodiversity crisis, the impacts of these efforts are unlikely to be reflected in improved trends in the state of biodiversity by 2020. We highlight areas of societal endeavor requiring additional efforts to achieve the Aichi Targets, and provide a baseline against which to assess future progress.
[Show abstract][Hide abstract] ABSTRACT: Restoration of degraded land is recognized by the international community as an important way of enhancing both biodiversity and ecosystem services, but more information is needed about its costs and benefits. In Cambridgeshire, U.K., a long-term initiative to convert drained, intensively farmed arable land to a wetland habitat mosaic is driven by a desire both to prevent biodiversity loss from the nationally important Wicken Fen National Nature Reserve (Wicken Fen NNR) and to increase the provision of ecosystem services. We evaluated the changes in ecosystem service delivery resulting from this land conversion, using a new Toolkit for Ecosystem Service Site-based Assessment (TESSA) to estimate biophysical and monetary values of ecosystem services provided by the restored wetland mosaic compared with the former arable land. Overall results suggest that restoration is associated with a net gain to society as a whole of $199 ha−1y−1, for a one-off investment in restoration of $2320 ha−1. Restoration has led to an estimated loss of arable production of $2040 ha−1y−1, but estimated gains of $671 ha−1y−1 in nature-based recreation, $120 ha−1y−1 from grazing, $48 ha−1y−1 from flood protection, and a reduction in greenhouse gas (GHG) emissions worth an estimated $72 ha−1y−1. Management costs have also declined by an estimated $1325 ha−1y−1. Despite uncertainties associated with all measured values and the conservative assumptions used, we conclude that there was a substantial gain to society as a whole from this land-use conversion. The beneficiaries also changed from local arable farmers under arable production to graziers, countryside users from towns and villages, and the global community, under restoration. We emphasize that the values reported here are not necessarily transferable to other sites.
Ecology and Evolution 09/2014; 20(4):3875-3886. · 1.66 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Invasive alien species are one of the primary threats to native biodiversity on islands worldwide. Consequently, eradicating invasive species from islands has become a mainstream conservation practice. Deciding which islands have the highest priority for eradication is of strategic importance to allocate limited resources to achieve maximum conservation benefit. Previous island prioritizations focused either on a narrow set of native species or on a small geographic area. We devised a prioritization approach that incorporates all threatened native terrestrial vertebrates and all invasive terrestrial vertebrates occurring on 11 U.K. overseas territories, which comprise over 2000 islands ranging from the sub-Antarctic to the tropics. Our approach includes eradication feasibility and distinguishes between the potential and realistic conservation value of an eradication, which reflects the benefit that would accrue following eradication of either all invasive species or only those species for which eradication techniques currently exist. We identified the top 25 priority islands for invasive species eradication that together would benefit extant populations of 155 native species including 45 globally threatened species. The 5 most valuable islands included the 2 World Heritage islands Gough (South Atlantic) and Henderson (South Pacific) that feature unique seabird colonies, and Anegada, Little Cayman, and Guana Island in the Caribbean that feature a unique reptile fauna. This prioritization can be rapidly repeated if new information or techniques become available, and the approach could be replicated elsewhere in the world. Priorización de Islas para la Erradicación de Vertebrados Invasores en los Territorios Exteriores del Reino Unido.
[Show abstract][Hide abstract] ABSTRACT: Habitat loss and degradation, driven largely by agricultural expansion and intensification, present the greatest immediate threat to biodiversity. Tropical forests harbour among the highest levels of terrestrial species diversity and are likely to experience rapid land-use change in the coming decades. Synthetic analyses of observed responses of species are useful for quantifying how land use affects biodiversity and for predicting outcomes under land-use scenarios. Previous applications of this approach have typically focused on individual taxonomic groups, analysing the average response of the whole community to changes in land use. Here, we incorporate quantitative remotely sensed data about habitats in, to our knowledge, the first worldwide synthetic analysis of how individual species in four major taxonomic groups—invertebrates, ‘herptiles’ (reptiles and amphibians), mammals and birds—respond to multiple human pressures in tropical and sub-tropical forests. We show significant independent impacts of land use, human vegetation offtake, forest cover and human population density on both occurrence and abundance of species, highlighting the value of analysing multiple explanatory variables simultaneously. Responses differ among the four groups considered, and—within birds and mammals—between habitat specialists and habitat generalists and between narrow-ranged and wide-ranged species.
Proceedings of the Royal Society B: Biological Sciences 08/2014; 281(1792):20141371. · 5.68 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Local stakeholders at the important but vulnerable Centre Hills on Montserrat consider that the continued presence of feral livestock (particularly goats and pigs) may lead to widespread replacement of the reserve’s native vegetation by invasive alien trees (Java plum and guava), and consequent negative impacts on native animal species. Since 2009, a hunting programme to control the feral livestock has been in operation. However long-term funding is not assured. Here, we estimate the effect of feral livestock control on ecosystem services provided by the forest to evaluate whether the biodiversity conservation rationale for continuation of the control programme is supported by an economic case. A new practical tool (Toolkit for Ecosystem Service Site-based Assessment) was employed to measure and compare ecosystem service provision between two states of the reserve (i.e. presence and absence of feral livestock control) to estimate the net consequences of the hunting programme on ecosystem services provided by the forest. Based on this we estimate that cessation of feral livestock management would substantially reduce the net benefits provided by the site, including a 46 % reduction in nature-based tourism (from $419,000 to $228,000) and 36 % reduction in harvested wild meat (from $205,000 to $132,000). The overall net benefit generated from annual ecosystem service flows associated with livestock control in the reserve, minus the management cost, was $214,000 per year. We conclude that continued feral livestock control is important for maintaining the current level of ecosystem services provided by the reserve.
[Show abstract][Hide abstract] ABSTRACT: Governments have agreed to expand the global protected area network from 13% to 17% of the world's land surface by 2020 (Aichi target 11) and to prevent the further loss of known threatened species (Aichi target 12). These targets are interdependent, as protected areas can stem biodiversity loss when strategically located and effectively managed. However, the global protected area estate is currently biased toward locations that are cheap to protect and away from important areas for biodiversity. Here we use data on the distribution of protected areas and threatened terrestrial birds, mammals, and amphibians to assess current and possible future coverage of these species under the convention. We discover that 17% of the 4,118 threatened vertebrates are not found in a single protected area and that fully 85% are not adequately covered (i.e., to a level consistent with their likely persistence). Using systematic conservation planning, we show that expanding protected areas to reach 17% coverage by protecting the cheapest land, even if ecoregionally representative, would increase the number of threatened vertebrates covered by only 6%. However, the nonlinear relationship between the cost of acquiring land and species coverage means that fivefold more threatened vertebrates could be adequately covered for only 1.5 times the cost of the cheapest solution, if cost efficiency and threatened vertebrates are both incorporated into protected area decision making. These results are robust to known errors in the vertebrate range maps. The Convention on Biological Diversity targets may stimulate major expansion of the global protected area estate. If this expansion is to secure a future for imperiled species, new protected areas must be sited more strategically than is presently the case.
[Show abstract][Hide abstract] ABSTRACT: AimHabitat loss continues to cause loss of biodiversity. To quantify the effects of land-use change on the diversity and composition of ecological communities – in terms of functional groups – we make modelled estimates of the impact of past and future (to 2050) land-use change on the overall diversity and dietary guild structure of tropical forest bird communities.LocationTropical and subtropical forests (40° S to 40° N).Methods
Using a likelihood-based model, we project the impact of land-use intensity on the diversity and functional structure of tropical forest bird communities, including an estimation of uncertainty. To explore the extent to which predicted impacts are determined by the inherent sensitivity of communities because of the traits possessed by the species present, we quantify communities in terms of trait composition and explore relationships between trait composition and diversity/guild loss.ResultsWe estimate that habitat loss has led to an average decrease of 4% in total abundance, but with marked differences across different guilds, leading to substantial changes in community composition: an 11.4% loss of frugivores, 7.8% loss of nectarivores and 7.3% loss of insectivores, and a 4.0% gain of other herbivores. Projected land-use change is predicted to result in average future losses of 1% of total abundance, 1% of each of frugivores, nectarivores and insectivores, but no average change in the abundance of other herbivores. Past and future changes have varied substantially across the biome, owing to variation in land-use change and in the initial trait composition of communities.Main conclusionsWe predict that marked changes in community structure have occurred in the past and will occur in the future, with disproportionate losses of frugivores, nectarivores and insectivores compared with other species; these species are known to provide important ecosystem services. In the past, South America has been particularly strongly affected, while Southeast Asia will experience the strongest impacts in the future.
Global Ecology and Biogeography 06/2014; · 7.22 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: In Nepal, community forestry is part of a national strategy for livelihoods improvement and environmental protection. However, analysis of the social, economic and environmental impacts of community forestry is often limited, restricted to a narrow set of benefits (e.g. non-timber forest products) and rarely makes comparisons with alternative land-use options (e.g. agriculture). This study, conducted at Phulchoki Mountain Forest Important Bird and Biodiversity Area (IBA) in the Kathmandu Valley, used methods from the Toolkit for Ecosystem Service Site-based Assessment (TESSA) to compare multiple ecosystem service values (including carbon storage, greenhouse gas sequestration, water provision, water quality, harvested wild goods, cultivated goods and nature-based recreation) provided by the site in its current state and a plausible alternative state in which community forestry had not been implemented. We found that outcomes from community forestry have been favourable for most stakeholders, at most scales, for most services and for important biodiversity at the site. However, not all ecosystem services can be maximised simultaneously, and impacts of land-use decisions on service beneficiaries appear to differ according to socio-economic factors. The policy implications of our findings are discussed in the context of proposals to designate Phulchoki Mountain Forest IBA as part of a Conservation Area.
[Show abstract][Hide abstract] ABSTRACT: Shifts in species' distribution and abundance in response to climate change have been well documented, but the underpinning processes are still poorly understood. We present the results of a systematic literature review and meta-analysis investigating the frequency and importance of different mechanisms by which climate has impacted natural populations. Most studies were from temperate latitudes of North America and Europe; almost half investigated bird populations. We found significantly greater support for indirect, biotic mechanisms than direct, abiotic mechanisms as mediators of the impact of climate on populations. In addition, biotic effects tended to have greater support than abiotic factors in studies of species from higher trophic levels. For primary consumers, the impact of climate was equally mediated by biotic and abiotic mechanisms, whereas for higher level consumers the mechanisms were most frequently biotic, such as predation or food availability. Biotic mechanisms were more frequently supported in studies that reported a directional trend in climate than in studies with no such climatic change, although sample sizes for this comparison were small. We call for more mechanistic studies of climate change impacts on populations, particularly in tropical systems.
Global Change Biology 03/2014; · 8.22 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Seabirds are the most threatened group of marine animals; 29% of species are at some risk of extinction. Significant threats to seabirds occur on islands where they breed, but in many cases, effective island conservation can mitigate these threats. To guide island-based seabird conservation actions, we identified all islands with extant or extirpated populations of the 98 globally threatened seabird species, as recognized on the International Union for Conservation of Nature Red List, and quantified the presence of threatening invasive species, protected areas, and human populations. We matched these results with island attributes to highlight feasible island conservation opportunities. We identified 1362 threatened breeding seabird populations on 968 islands. On 803 (83%) of these islands, we identified threatening invasive species (20%), incomplete protected area coverage (23%), or both (40%). Most islands with threatened seabirds are amenable to island-wide conservation action because they are small (57% were <1 km2), uninhabited (74%), and occur in high- or middle-income countries (96%). Collectively these attributes make islands with threatened seabirds a rare opportunity for effective conservation at scale.La Biogeografía de Aves Marinas Amenazadas Globalmente y las Oportunidades de Conservación en IslasResumenLas aves marinas son el grupo más amenazado de animales marinos ya que el 29% de las especies tienen algún riesgo de extinción. Amenazas significativas para las aves marinas suceden en las islas donde se reproducen, pero en muchos casos la conservación efectiva de islas puede mitigar estas amenazas. Para orientar las acciones de conservación de aves marinas en islas, identificamos todas las islas con poblaciones existentes o extirpadas de 98 especies de aves marinas amenazadas, identificadas en la Lista Roja de la UICN, y cuantificamos la presencia de especies invasoras amenazantes, áreas protegidas y poblaciones humanas. Igualamos estos resultados con los atributos de la isla para resaltar las oportunidades de conservación factibles en la isla. Identificamos 1, 362 poblaciones reproductivas de aves marinas en 968 islas. En 803 (83%) de estas islas identificamos especies invasoras amenazantes (205), cobertura incompleta del área protegida (23%) o ambas (40%). La mayoría de las islas con aves marinas amenazadas son receptivas a una acción de conservación de toda la isla ya que son pequeñas (el 57% fue < 1km2), deshabitadas (74%) y se encuentran en países de ingresos altos o de nivel medio (96%). Estos atributos colectivamente hacen que las islas con aves marinas amenazadas sean una oportunidad rara para la conservación efectivo a escala.
[Show abstract][Hide abstract] ABSTRACT: Species' geographical distributions are tracking latitudinal and elevational surface temperature gradients under global climate change. To evaluate the opportunities to track these gradients across space, we provide a first baseline assessment of the steepness of these gradients for the world's terrestrial birds. Within the breeding ranges of 9,014 bird species, we characterized the spatial gradients in temperature along latitude and elevation for all and a subset of bird species, respectively. We summarized these temperature gradients globally for threatened and non-threatened species and determined how their steepness varied based on species' geography (range size, shape, and orientation) and projected changes in temperature under climate change. Elevational temperature gradients were steepest for species in Africa, western North and South America, and central Asia and shallowest in Australasia, insular IndoMalaya, and the Neotropical lowlands. Latitudinal temperature gradients were steepest for extratropical species, especially in the Northern Hemisphere. Threatened species had shallower elevational gradients whereas latitudinal gradients differed little between threatened and non-threatened species. The strength of elevational gradients was positively correlated with projected changes in temperature. For latitudinal gradients, this relationship only held for extratropical species. The strength of latitudinal gradients was better predicted by species' geography, but primarily for extratropical species. Our findings suggest threatened species are associated with shallower elevational temperature gradients, whereas steep latitudinal gradients are most prevalent outside the tropics where fewer bird species occur year-round. Future modeling and mitigation efforts would benefit from the development of finer grain distributional data to ascertain how these gradients are structured within species' ranges, how and why these gradients vary among species, and the capacity of species to utilize these gradients under climate change.
PLoS ONE 01/2014; 9(5):e98361. · 3.53 Impact Factor
Progress Towards the Aichi Biodiversity Targets: An Assessment of Biodiversity Trends, policy scenarios and key actions, Edited by P. W. Leadley, C. B. Krug, R. Alkemade, H. M. Pereira, U.R. Sumalia, M. Walpole, A. Marques, T. Newbold, L. S. L. Tehn, J. van Kolck, C. Bellard, S. R. Januchowski-Hartley, P. J. Mumby, 01/2014: chapter Target 14: Ecosystems that provide essential services: pages 14.1-14.34; Secretariat of the Convention for Biological Diversity., ISBN: ISBN-978-92-807-3414-0
[Show abstract][Hide abstract] ABSTRACT: Sites that are important for biodiversity conservation can also provide significant benefits (i.e. ecosystem
services) to people. Decision-makers need to know how change to a site, whether development or
restoration, would affect the delivery of services and the distribution of any benefits among stakeholders.
However, there are relatively few empirical studies that present this information. One reason is the lack of
appropriate methods and tools for ecosystem service assessment that do not require substantial resources
or specialist technical knowledge, or rely heavily upon existing data. Here we address this gap by
describing the Toolkit for Ecosystem Service Site-based Assessment (TESSA). It guides local non-specialists
through a selection of relatively accessible methods for identifying which ecosystem services may be
important at a site, and for evaluating the magnitude of benefits that people obtain from them currently,
compared with those expected under alternative land-uses. The toolkit recommends use of existing data
where appropriate and places emphasis on enabling users to collect new field data at relatively low cost
and effort. By using TESSA, the users could also gain valuable information about the alternative land-uses;
and data collected in the field could be incorporated into regular monitoring programmes.