Using recent baselines as benchmarks for megafauna restoration places an unfair burden on the Global South

The potential for megafauna restoration is unevenly distributed across the world, along with the socio‐political capacity of countries to support these restoration initiatives. We show that choosing a recent baseline to identify species' indigenous range puts a higher burden for megafauna restoration on countries in the Global South, which also have less capacity to support these restoration initiatives. We introduce the Megafauna Index, which considers large mammal's potential species richness and range area at the country level, to explore how the responsibility for megafauna restoration is distributed across the world according to four scenarios using various temporal benchmarks to define species' indigenous range – current, historical (1500 AD), mid‐Holocene and Pleistocene. We test how the distribution of restoration burden across the world correlates with indicators of conservation funding, human development and governance. Using a recent or historical baseline as a benchmark for restoration puts a higher pressure on African and south‐east Asian countries while lifting the responsibility from the Global North, where extinctions happened a long time ago. When using a mid‐Holocene or Pleistocene baseline, new opportunities arise for megafauna restoration in Europe and North America, respectively, where countries have a higher financial and societal capacity to support megafauna restoration. These results contribute to the debate around benchmarks in rewilding initiatives and the ethical implications of using recent baselines to guide restoration efforts. We suggest that countries from the Global North should reflect on their responsibility in supporting global restoration efforts, by both increasing their support for capacity building in the Global South and taking responsibility for restoring lost megafauna at home.

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“…Data are available from Figshare: <https://doi.org/10.6084/m9.figshare.14212619.v1> (Monsarrat and Svenning 2021).…”

Section: Transparent Peer Reviewmentioning

confidence: 99%

Using recent baselines as benchmarks for megafauna restoration places an unfair burden on the Global South

Monsarrat

Svenning

2021

Ecography

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“…Similar declines in megafauna occurred in Europe (Crees and Turvey, 2014;Crees et al, 2016) and the Middle East (Tsahar et al, 2009;Bar-Oz et al, 2011). The relationship between these losses and intensified human impact is widely accepted, yet classic conservation and restoration focus on a baseline set at or after 1500 CE, a time when ecosystems were already highly simplified or degraded (Martin, 1967;Donlan et al, 2006;Monsarrat and Svenning, 2022).…”

Section: Introductionmentioning

confidence: 99%

The late-Quaternary megafauna extinctions: Patterns, causes, ecological consequences and implications for ecosystem management in the Anthropocene

Svenning,

Lemoine,

Bergman

et al. 2024

Camb. prisms Extinction

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Across the last ~50,000 years (the late Quaternary) terrestrial vertebrate faunas have experienced severe losses of large species (megafauna), with most extinctions occurring in the Late Pleistocene and Early to Middle Holocene. Debate on the causes has been ongoing for over 200 years, intensifying from the 1960s onward. Here, we outline criteria that any causal hypothesis needs to account for. Importantly, this extinction event is unique relative to other Cenozoic (the last 66 million years) extinctions in its strong size bias. For example, only 11 out of 57 species of megaherbivores (body mass ≥1,000 kg) survived to the present. In addition to mammalian megafauna, certain other groups also experienced substantial extinctions, mainly large non-mammalian vertebrates and smaller but megafauna-associated taxa. Further, extinction severity and dates varied among continents, but severely affected all biomes, from the Arctic to the tropics. We synthesise the evidence for and against climatic or modern human (Homo sapiens) causation, the only existing tenable hypotheses. Our review shows that there is little support for any major influence of climate, neither in global extinction patterns nor in fine-scale spatiotemporal and mechanistic evidence. Conversely, there is strong and increasing support for human pressures as the key driver of these extinctions, with emerging evidence for an initial onset linked to pre-sapiens hominins prior to the Late Pleistocene. Subsequently, we synthesize the evidence for ecosystem consequences of megafauna extinctions and discuss the implications for conservation and restoration. A broad range of evidence indicates that the megafauna extinctions have elicited profound changes to ecosystem structure and functioning. The late-Quaternary megafauna extinctions thereby represent an early, large-scale human-driven environmental transformation, constituting a progenitor of the Anthropocene, where humans are now a major player in planetary functioning. Finally, we conclude that megafauna restoration via trophic rewilding can be expected to have positive effects on biodiversity across varied Anthropocene settings.

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Preventing extinction in an age of species migration and planetary change

Lundgren,

Wallach,

Svenning

et al. 2023

Preprint

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International and national conservation policies almost exclusively focus on conserving species in their historic native ranges, thus excluding species that have dispersed on their own accord or have been introduced by people. Given that many of these "migrant" species are threatened in their native ranges, conservation goals that explicitly exclude these migrant populations may overlook opportunities to prevent extinctions and respond dynamically to rapidly changing environmental and climatic conditions. Focusing on terrestrial mammals, we quantified the extent to which migration, in this case via introductions, has provided new homes for threatened mammal species. We then devised alternative scenarios for the inclusion of migrant populations in mainstream conservation policy with the aim of preventing global species extinctions and used spatial prioritization algorithms to simulate how these scenarios could change global spatial conservation priorities. We found that 22% of all identified migrant mammals (70 species) are threatened in their native ranges, mirroring the 25% of all mammals that are threatened. Reassessing global threat statuses by combining native and migrant ranges reduced the threat status of 23 species (~33% of threatened migrants). Thus, including migrant populations in threat assessments provides a more accurate assessment of actual global extinction risk among species. Spatial prioritization simulations showed that reimagining the role of migrant populations to prevent global species extinction could increase the importance of overlooked landscapes, particularly in central Australia. Our results indicate that these various and non-exhaustive ways to consider migrant populations, with due consideration for potential conservation conflicts with resident taxa, may provide unprecedented opportunities to prevent species extinctions. We present these alternatives and spatial simulations to stimulate discussion on how conservation ought to respond, both pragmatically and ethically, to rapid environmental change in order to best prevent extinctions.

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Using recent baselines as benchmarks for megafauna restoration places an unfair burden on the Global South

Cited by 3 publications

References 80 publications

Using recent baselines as benchmarks for megafauna restoration places an unfair burden on the Global South

Using recent baselines as benchmarks for megafauna restoration places an unfair burden on the Global South

The late-Quaternary megafauna extinctions: Patterns, causes, ecological consequences and implications for ecosystem management in the Anthropocene

Preventing extinction in an age of species migration and planetary change

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