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Abstract

This chapter examines the links between biodiversity and worldwide patterns of zoonotic disease outbreaks. We find that biodiversity appears to be a major contributing factor determining the diversity of human infectious diseases, and that zoonotic disease outbreaks should be considered with the indices of human development and biodiversity loss. Increasing population and wealth (i.e., GDP) both threaten biodiversity and favour epidemics, leading us to conduct an analysis showing the deleterious impacts of development (and globalization) on health. Our results support this premise in contrast to most studies showing generally negative effects of biodiversity reduction on the spread of infectious diseases. Biodiversity has a complex relationship with human infectious diseases, serving both as a source of pathogens and as a regulating factor, keeping the incidence down.
... In many areas of life, EZD's caused by pathogens ( Figure 1, Tables 3 and 4) pose a threat with dynamic interactions at the HAE-interface in the last 40-45 years. According to current data [29][30][31][32][33][34][35], there are two main causes of these multiple and complex threats namely ecological and anthropogenic factors. ...
... In recent years, land use, climate change, human movements and animal-commodity transport are important factors that lead to regional and global spread of Re-emerging Disease and/or Emerging Zoonotic Disease [30][31][32][33][34]. As with all infections, it should not be ignored that the occurrence dynamics of EZDs or Re-Emerging Zoonotic Diseases are complex and involve many sectors in the prevention / protection process. ...
... Considering that only AIDS exists on the map in the 1980s, the identification of so many pathogens poses a serious threat to public and ecosystem health in the last 37 years. In addition, according to Morand et al. [32] report and Table 2, there is a positive relationship between the decrease of biodiversity and local / regional spread of pathogens and increase of Re-emerging disease. Therefore, as shown in the map in Figure 1 and in Tables 2 and 3, when the effects of pathogens on human and animal health are reviewed, it is understood that there are many "preparatory factors" in the background of the increase and spread of EZD's [33]. ...
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In the last half century, decreasing biodiversity caused by anthropogenic factors turned into ecosystem health problem. With the decrease of biodiversity, the degradation of the ecological balance also poses a threat to public health. The damages caused by ecological and anthropogenic factors are the main triggers for the development of Emerging Zoonotic Diseases (EZDs). In this context, persistent EZDs due to multiple factors have reached more dangerous levels in terms of human, animal and environmental health. Increasing land-use changes, intensified agriculture and animal husbandry practices, global climate changes, changes in people's food consumption preferences, intensive migration from rural to urban areas, ecological distortions due to changing trade and tourism mobility are all human-induced dynamics, all of which lead to socioeconomic threats. In recent years, both ecosystem related problems resulting from the decline of biodiversity and the dynamic interactions between human, animal and environment (HAE) have made interdisciplinary cooperation more important than in the past. It has become an inevitable necessity to eliminate the accumulated Anthropocene remains in the last 150 years, to solve the health problems at the HAE-interface and to make the health and well-being of humanity sustainable. These accumulated problems of today can be solved with ‘One Health’ which is defined as multi-interdisciplinary understanding, joint effort and thought system which is worked on local, national, regional and global-scale in order to obtain the optimum health for humans, animals and our environment. As a result, interdisciplinary cooperation should be prioritized to solve common problems of complex health problems and threats. Therefore, the ‘One Health’ approach should be functionalized, institutionalized and expanded. Because exponentially growing ecological, anthropogenic disasters increase microbial threats. Therefore, in the 21st century, humanity has no more than 50 years to lose.
... In many areas of life, EZD's caused by pathogens ( Figure 1, Tables 3 and 4) pose a threat with dynamic interactions at the HAE-interface in the last 40-45 years. According to current data [29][30][31][32][33][34][35], there are two main causes of these multiple and complex threats namely ecological and anthropogenic factors. ...
... In recent years, land use, climate change, human movements and animal-commodity transport are important factors that lead to regional and global spread of Re-emerging Disease and/or Emerging Zoonotic Disease [30][31][32][33][34]. As with all infections, it should not be ignored that the occurrence dynamics of EZDs or Re-Emerging Zoonotic Diseases are complex and involve many sectors in the prevention / protection process. ...
... Considering that only AIDS exists on the map in the 1980s, the identification of so many pathogens poses a serious threat to public and ecosystem health in the last 37 years. In addition, according to Morand et al. [32] report and Table 2, there is a positive relationship between the decrease of biodiversity and local / regional spread of pathogens and increase of Re-emerging disease. Therefore, as shown in the map in Figure 1 and in Tables 2 and 3, when the effects of pathogens on human and animal health are reviewed, it is understood that there are many "preparatory factors" in the background of the increase and spread of EZD's [33]. ...
... The recent global emergence of zoonoses, viz. COVID-19, Nipah, Middle East respiratory syndrome (MERS), Ebola, Crimean-Congo haemorrhagic fever (CCHF), severe acute respiratory syndrome (SARS), etc., exhibited that even the slight imbalances to the ecosystem may result in deadly public health related consequences (Morand et al. 2014). ...
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The emerging public health issues of 21st century have clearly warned us that the efficient tackling of these threats need to be done in collaborative manner between relevant public health professionals under the umbrella of One Health. The concept of One Health is longstanding; however, it is gaining due momentum across the globe, especially in context of tackling emerging zoonoses. India remains vulnerable to many of emerging health threats due to demographic, socio-economic and other factors related with globalization, climate change and related biodiversity losses. In India, the various public health agencies which includes human, animal and environmental health professionals have contributed joint efforts in recent past to confront the One Health related issues. However, the bridging of professional silos to act more synergistically need further sustained efforts from all the stakeholders, including policy makers.
... Land-use change and habitat loss together with the biodiversity loss causing the sixth mass extinctions are the climate change reasons behind epidemics [3,4]. As the WWF neatly summarises (Figure 1) [5], as long as the forest ecosystems are healthy and there exists a proper countryside buffer (without intensive farming) to the cities, spill overs to humans are extremely unlikely [6]. ...
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COVID-19 escalated into a pandemic posing humanitarians and scientific challenges. We explored the geographical feature of the first wave infection and correlated it with annual satellite and ground indexes of air quality in eight countries: China, U.S.A, Italy, Iran, France, Spain, Germany, and U.K. Controlling for population size, we found more viral infections in those areas which were afflicted by high PM 2.5 and nitrogen dioxide values. Higher mortality was also correlated with relatively poor air quality. This phenomenon also occurs in China when removing, the city of Wuhan and its province from the dataset. For long recognised to be a high-risk factor for several respiratory-related diseases and conditions, air pollution seems to be a risk factor for COVID-19 too. This finding suggests the detrimental impact climate change will have on the trajectory of future respiratory epidemics. Previous Asian epidemics and the Ebola have brought forward evidence of the natural causes of zoonoses which have become more threatening due to land-use change, ensued lack of a buffer zone between the cities and the forests, and our closer proximity to wild pathogens. Together with air pollution, these elements illustrate the need to stick to the UN targets limiting biodiversity loss and climate change.
... Can the fossil fuel economy carry on unabated once we resume the lockdowns? Institutions need to endorse these interventions and speed up reforms more seriously [131,132], together with endorsing collateral and more comprehensive measures [133] playing a role in epidemics and zoonoses [134,135], such as impeding biodiversity loss and land use change [136][137][138][139][140], decreasing intensive livestock farming, and alleviating poverty [141,142]. This new coronavirus shall be an opportunity given to the governments to forcefully revive sustainable development goals. ...
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COVID-19 escalated into a pandemic posing several humanitarian as well as scientific challenges. We here investigated the geographical character of the early spread of the infection and correlated it with several annual satellite and ground indexes of air quality in China, the United States, and the United Kingdom. The time of the analysis corresponded with the end of the first wave infection in China, namely June 2020. We found more viral infections in those areas afflicted by high PM 2.5 and nitrogen dioxide values. Higher mortality was also correlated with relatively poor air quality. In Italy, the correspondence between the Po Valley pollution and SARS-CoV-2 infections and induced mortality was the starkest, originating right in the most polluted European area. Spain and Germany did not present a noticeable gradient of pollution levels causing non-significant correlations. Densely populated areas were often hotspots of lower air quality levels but were not always correlated with a higher viral incidence. Air pollution has long been recognised as a high risk factor for several respiratory-related diseases and conditions, and it now appears to be a risk factor for COVID-19 as well. As such, air pollution should always be included as a factor for the study of airborne epidemics and further included in public health policies.
... Although it is still difficult to determine exactly how this initial contact was made between humans and animals carrying the SARS-CoV-2 coronavirus, however, there has been an exponential and rapid increase in the last quarter of the twentieth century of zoonosis. There is a strong correlation between this phenomenon and the number of threatened bird and mammal species according to the criteria of The International Union for Conservation of Nature Red List of Threatened Species -IUCN (Morand, Owers & Bordes, 2014). Research suggests that the pressures exerted by these anthropogenic activities on biodiversity, in particular the overexploitation of living resources (including poaching), the fragmentation and rapid reduction of natural habitats leading to a collapse of animal and plant populations and a significant loss of genetic diversity and phylogenetic are at the origin and multiplication of these zoonosis (Morand, Jittapalapong, Suputtamongkol, Abdullah & Huan, 2014). ...
... Although higher animal host and pathogen species diversity is associated with an increased risk of disease emergence (243), complex host, environmental and pathogen relationships ultimately determine spillover risk (206,244). A high level of biodiversity can serve as a source of pathogens, but can also serve as a regulating factor (termed the "dilution" effect), where by loss of habitat specialists and predators due to habitat disturbance or hunting, can allow more generalist reservoir host species, such as some rodent species, to proliferate (240,245). Zoonotic viral richness correlates strongly with mammalian species diversity and abundance (2), and domestic species harbor, on average, 19.3 zoonotic viruses compared to an average for free-ranging wildlife of 0.23 (2). Wildlife make up <1% of the world's non-human mammal biomass, thus, whilst wildlife is of concern as a source of uncommon but significant animal-origin EIDs, land-use change for agricultural intensification to supply human food systems, particularly for livestock, is of concern as a significant driver of EID risk (19,24,238). ...
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The COVID-19 pandemic has re-focused attention on mechanisms that lead to zoonotic disease spillover and spread. Commercial wildlife trade, and associated markets, are recognized mechanisms for zoonotic disease emergence, resulting in a growing global conversation around reducing human disease risks from spillover associated with hunting, trade, and consumption of wild animals. These discussions are especially relevant to people who rely on harvesting wildlife to meet nutritional, and cultural needs, including those in Arctic and boreal regions. Global policies around wildlife use and trade can impact food sovereignty and security, especially of Indigenous Peoples. We reviewed known zoonotic pathogens and current risks of transmission from wildlife (including fish) to humans in North American Arctic and boreal biomes, and evaluated the epidemic and pandemic potential of these zoonoses. We discuss future concerns, and consider monitoring and mitigation measures in these changing socio-ecological systems. While multiple zoonotic pathogens circulate in these systems, risks to humans are mostly limited to individual illness or local community outbreaks. These regions are relatively remote, subject to very cold temperatures, have relatively low wildlife, domestic animal, and pathogen diversity, and in many cases low density, including of humans. Hence, favorable conditions for emergence of novel diseases or major amplification of a spillover event are currently not present. The greatest risk to northern communities from pathogens of pandemic potential is via introduction with humans visiting from other areas. However, Arctic and boreal ecosystems are undergoing rapid changes through climate warming, habitat encroachment, and development; all of which can change host and pathogen relationships, thereby affecting the probability of the emergence of new (and re-emergence of old) zoonoses. Indigenous leadership and engagement in disease monitoring, prevention and response, is vital from the outset, and would increase the success of such efforts, as well as ensure the protection of Indigenous rights as outlined in the United Nations Declaration on the Rights of Indigenous Peoples. Partnering with northern communities and including Indigenous Knowledge Systems would improve the timeliness, and likelihood, of detecting emerging zoonotic risks, and contextualize risk assessments to the unique human-wildlife relationships present in northern biomes.
... 21). Des analyses à l'échelle des nations, et s'intéressant non pas au nombre de maladies infectieuses mais au nombre d'épidémies, montrent que leur augmentation serait liée à la baisse de la biodiversité (appréciée par le nombre de mammifères et d'oiseaux en danger enregistrés sur la Liste rouge de l'IUCN) (Morand et al., 2014). ...
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Spicier food in hot countries has been explained in terms of natural selection on human cultures, with spices with antimicrobial effects considered to be an adaptation to increased risk of foodborne infection. However, correlations between culture and environment are difficult to interpret, because many cultural traits are inherited together from shared ancestors, neighbouring cultures are exposed to similar conditions, and many cultural and environmental variables show strong covariation. Here, using a global dataset of 33,750 recipes from 70 cuisines containing 93 different spices, we demonstrate that variation in spice use is not explained by temperature and that spice use cannot be accounted for by diversity of cultures, plants, crops or naturally occurring spices. Patterns of spice use are not consistent with an infection-mitigation mechanism, but are part of a broader association between spice, health, and poverty. This study highlights the challenges inherent in interpreting patterns of human cultural variation in terms of evolutionary pressures.
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Infectious diseases, biodiversity loss and livestock expansion are increasing globally, and examining patterns that link them is important for both public health and conservation. This study is a first attempt to analysis globally these patterns using General additive modelling and Structural equation modelling. A positive association between the number of infectious and parasitic diseases recorded in humans and the total number of animal species between nations was observed. A similar positive association between the number of outbreaks of human infectious diseases, corrected for the number of surveys, and the number of threatened animal species, corrected for the number of animal species, suggests that outbreaks of human infectious diseases are linked with threatened biodiversity. Results of the analyses over the longest period of the dataset (2000–2019) showed a positive correlation between the increasing number of cattle and the number of threatened species, a positive correlation between the increasing number of cattle and the number of outbreaks of human diseases, and a lack of correlation between the number of outbreaks and the number of threatened animal species. As a result, the growing importance of livestock on the planet, while threatening biodiversity, increasingly puts human and animal health at risk. This study calls for further analyses on the consequences of livestock expansion, which depends on several factors that vary by country, namely the growth of human population, changes in diet linked to the westernization of habits, agricultural industrialization and the integration into the world trade, but also the cultural values of livestock.
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Utilitarian arguments concerning the value of biodiversity often include the benefits of animals, plants, and microbes as sources of medicines and as laboratory models of disease. The concept that species diversity per se may influence risk of exposure to disease has not been well developed, however. We present a conceptual model of how high species richness and evenness in communities of terrestrial vertebrates may reduce risk of exposure to Lyme disease, a spirochetal ( Borrelia burgdorferi) disease transmitted by ixodid tick vectors. Many ticks never become infected because some hosts are highly inefficient at transmitting spirochete infections to feeding ticks. In North America, the most competent reservoir host for the Lyme disease agent is the white-footed mouse ( Peromyscus leucopus), a species that is widespread and locally abundant. We suggest that increases in species diversity within host communities may dilute the power of white-footed mice to infect ticks by causing more ticks to feed on inefficient disease reservoirs. High species diversity therefore is expected to result in lower prevalence of infection in ticks and consequently in lower risk of human exposure to Lyme disease. Analyses of states and multistate regions along the east coast of the United States demonstrated significant negative correlations between species richness of terrestrial small mammals (orders Rodentia, Insectivora, and Lagomorpha), a key group of hosts for ticks, and per capita numbers of reported Lyme disease cases, which supports our “dilution effect” hypothesis. We contrasted these findings to what might be expected when vectors acquire disease agents efficiently from many hosts, in which case infection prevalence of ticks may increase with increasing diversity hosts. A positive correlation between per capita Lyme disease cases and species richness of ground-dwelling birds supported this hypothesis, which we call the “rescue effect.” The reservoir competence of hosts within vertebrate communities and the degree of specialization by ticks on particular hosts will strongly influence the relationship between species diversity and the risk of exposure to the many vector-borne diseases that plague humans. Resumen: Argumentos utilitarios relacionados con el valor de la biodiversidad frecuentemente incluyen los beneficios de animales, plantas y microbios como recursos para medicinas y como modelos de enfermedades en laboratorio. Sin embargo, la idea de que la diversidad de especies por sí misma puede influenciar el riesgo de exposición a enfermedades no ha sido bien desarrollada. Presentamos un modelo conceptual de cómo la riqueza de especies y la uniformidad en comunidades de vertebrados terrestres puede reducir el riesgo de exposición a la enfermedad de Lyme, una enfermedad causada por una espiroqueta ( Borrelia burgdorferi) y transmitida por una garrapata ixódida. Muchas garrapatas nunca son infectadas debido a que los huéspedes son altamente ineficientes en la transmisión de espiroquetas a las garrapatas que se alimentan de ellos. En Norte América, el huésped reservorio más competente del agente de la enfermedad de Lyme es el ratón de patas blancas ( Peromyscus leucopus), una especie de amplia dispersión y localmente abundante. Sugerimos que los incrementos en la diversidad de especies dentro de las comunidades de huéspedes pueden diluir el potencial de infección de las garrapatas por el ratón de patas blancas al ocasionar que más garrapatas se alimenten de reservorios ineficientes en la transmisión de la enfermedad. Por lo tanto, se esperaría que una alta diversidad de especies resulte en una prevalencia de infección de garrapatas reducida y, por lo tanto, en una disminución del riesgo de exposición de humanos a la enfermedad de Lyme. Un análisis por estado y de varios estados a lo largo de la costa este de los Estados Unidos demostró correlaciones significativamente negativas entre la riqueza de especies de mamíferos terrestres pequeños (órdenes Rodentia, Insectivora, y Lagomorfa), un grupo clave de huéspedes para garrapatas, y los números per capita de casos de la enfermedad de Lyme reportados, lo cual apoya nuestra hipótesis de efecto de dilución. Contrastamos estos resultados con lo que se podría esperar cuando los vectores adquieren eficientemente agentes de la enfermedad de muchos huéspedes, caso en el cual, una alta diversidad causaría la prevalencia de infección de garrapatas permaneciendo alta aún cuando la diversidad de huéspedes disminuyera. Una correlación positiva entre los casos de la enfermedad de Lyme per capita y la riqueza de especies de aves residentes del suelo apoya esta hipótesis, que hemos llamado efecto de rescate. La capacidad de reservorio de huéspedes dentro de las comunidades de vertebrados y el grado de especialización de las garrapatas en huéspedes particulares, influenciaría fuertemente la relación entre la diversidad de especies y el riesgo de exposición a muchas de las enfermedades transmitidas por vectores que infectan a humanos.
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Biogeographers have noted many strong patterns in the diversity and distribution of animal and plant taxa. Human cultural diversity also exhibits strong geographical patterns. Here we analyse the global distribution of 3814 human cultures in relation to latitude and climatic parameters. The density and diversity of human cultures declines with latitude and increases with temperature and rainfall. Human cultures in tropical, wetter or warmer areas have smaller ranges and are more densely packed and differentiated. These relationships can be documented statistically in ways that parallel species diversity among other organisms. The global nature of these patterns implies ecological equilibrium independent of evolutionary history in different continents, and has implications for the interpretation of human genetic diversity, as well as for the understanding of processes of human cultural diversification and their relationship to evolutionary and ecological mechanisms.
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Forest destruction and fragmentation in the United States recently have been shown to reduce mammalian species diversity and to elevate population densities of white-footed mice ( Peromyscus leucopus ). One potential consequence of reduced species diversity and high mouse density in small fragments is an increase in human exposure to Lyme disease. Increased risk of exposure to this disease is expected because of the role of the white-footed mouse as the principal natural reservoir of the Lyme bacterium, Borrelia burgdorferi. Blacklegged ticks ( Ixodes scapularis ) feeding on mice have a higher probability of becoming infected with the bacterium than do ticks feeding on any other host species. We hypothesized that small forest patches ( <2 ha ) have a higher density of infected nymphal blacklegged ticks, which is the primary risk factor for Lyme disease, than larger patches ( 2–8 ha ). In the summer of 2000, we sampled tick density and B. burgdorferi infection prevalence in 14 maple-dominated forest patches, ranging in size from 0.7 to 7.6 ha, in Dutchess County of southeastern New York state. We found a significant linear decline in nymphal infection prevalence with increasing patch area and a significant exponential decline in nymphal density with increasing patch area. The consequence was a dramatic increase in the density of infected nymphs, and therefore in Lyme disease risk, with decreasing forest patch size. We did not observe a similar relationship between the density of larval ticks and patch size. These results suggest that by influencing the community composition of vertebrate hosts for disease-bearing vectors, habitat fragmentation can influence human health.
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By studying Bartonella prevalence in rodent communities from 23 geographic sites in the western United States and one site in northern Mexico, the present study focused on the effects of rodent community diversity (measured by richness and Shannon index) and composition on prevalence of Bartonella infections. The analysis showed negative correlations of Bartonella prevalence with rodent richness and Shannon index. Further, Bartonella prevalence varied among rodent genera/species. Three models were applied to explain the observations. (1) Within-species/genus transmission: Bartonella strains usually are host-specific and adding non-host species would decrease Bartonella prevalence in its principal host through reduction of host contact (encounter reduction); (2) Frequency-dependence: Adding hosts would decrease the proportion of all infected individuals in the community, resulting in a reduction in the number of contacts between susceptible and infected individuals that usually leads to transmission (transmission reduction); and (3) Dominant species effect: Dominant species, if not susceptible to Bartonellae, can constrain the abundance of susceptible hosts (susceptible host regulation). These mechanisms work in concert; and the level of Bartonella prevalence is an outcome of regulation of all of these mechanisms on the entire system.
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Several studies provide evidence of a link between vector-borne disease outbreaks and El Niño driven climate anomalies. Less investigated are the effects of the North Atlantic Oscillation (NAO). Here, we test its impact on outbreak occurrences of 13 infectious diseases over Europe during the last fifty years, controlling for potential bias due to increased surveillance and detection. NAO variation statistically influenced the outbreak occurrence of eleven of the infectious diseases. Seven diseases were associated with winter NAO positive phases in northern Europe, and therefore with above-average temperatures and precipitation. Two diseases were associated with the summer or spring NAO negative phases in northern Europe, and therefore with below-average temperatures and precipitation. Two diseases were associated with summer positive or negative NAO phases in southern Mediterranean countries. These findings suggest that there is potential for developing early warning systems, based on climatic variation information, for improved outbreak control and management.
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Accelerating rates of species extinctions and disease emergence underscore the importance of understanding how changes in biodiversity affect disease outcomes. Over the past decade, a growing number of studies have reported negative correlations between host biodiversity and disease risk, prompting suggestions that biodiversity conservation could promote human and wildlife health. Yet the generality of the diversity-disease linkage remains conjectural, in part because empirical evidence of a relationship between host competence (the ability to maintain and transmit infections) and the order in which communities assemble has proven elusive. Here we integrate high-resolution field data with multi-scale experiments to show that host diversity inhibits transmission of the virulent pathogen Ribeiroia ondatrae and reduces amphibian disease as a result of consistent linkages among species richness, host composition and community competence. Surveys of 345 wetlands indicated that community composition changed nonrandomly with species richness, such that highly competent hosts dominated in species-poor assemblages whereas more resistant species became progressively more common in diverse assemblages. As a result, amphibian species richness strongly moderated pathogen transmission and disease pathology among 24,215 examined hosts, with a 78.4% decline in realized transmission in richer assemblages. Laboratory and mesocosm manipulations revealed an approximately 50% decrease in pathogen transmission and host pathology across a realistic diversity gradient while controlling for host density, helping to establish mechanisms underlying the diversity-disease relationship and their consequences for host fitness. By revealing a consistent link between species richness and community competence, these findings highlight the influence of biodiversity on infection risk and emphasize the benefit of a community-based approach to understanding infectious diseases.
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Over the past decade, the field of biocultural diversity has arisen as an area of transdisciplinary research concerned with investigating the links between the world's linguistic, cultural, and biological diversity as manifestations of the diversity of life. The impetus for the emergence of this field came from the observation that all three diversities are under threat by some of the same forces and from the perception that loss of diversity at all levels spells dramatic consequences for humanity and the earth. Accordingly, the field of biocultural diversity has developed with both a theoretical and a practical side, the latter focusing on on-the-ground work and policy, as well as with an ethics and human rights component. This review provides some background on the historical antecedents and beginnings of this field and on its philosophical and ethical underpinnings, and then surveys the key literature on biocultural diversity, concentrating on three main aspects: global and regional studies on ...