Tropical Wet Forest
Basin-Wide Effects of Game Harvest on Vertebrate Population Densities in Amazonian Forests: Implications for Animal-Mediated Seed DispersalBackgroundTropical forest ecosystems depend heavily on animal-plant interactions, particularly seed dispersal by vertebrates. However, widespread hunting in the Amazon has led to a significant decline in populations of many vertebrate species, especially large-bodied frugivores that are crucial for dispersing seeds of large-seeded plant species. While some vertebrate species are more sensitive to hunting than others, the cumulative impact of hunting across the Amazon basin remains poorly quantified. This study seeks to understand how subsistence hunting affects vertebrate populations and, by extension, the ecological services they provide, especially seed dispersal. Open access copy available |
Improving Sustainable Tropical Forest Management with Voluntary Carbon MarketsBackgroundTropical forests play a critical role in global carbon sequestration, absorbing approximately 1 petagram (Pg) of carbon annually, more than any other terrestrial ecosystem. However, deforestation and forest degradation are undermining these forests’ potential to mitigate climate change. Reduced-impact logging and sustainable forest management (SFM) have been promoted to limit damage, yet many existing SFM plans fail to account for variations in tree growth rates, species traits, and site-specific conditions. As voluntary carbon markets expand, they offer new opportunities to finance improved forest management and increase carbon sequestration through “carbon-focused sustainable forest management” (SFM + C). Open access copy available |
Carbon Costs and Bushmeat Benefits of Hunting in Tropical ForestsBackgroundOverhunting is a widespread issue in tropical forests, leading to the depletion of frugivorous animals that play a crucial role in seed dispersal. The loss of these animals can shift tree species composition, ultimately reducing forest carbon storage. While hunting provides an essential source of protein and income for local communities, its long-term effects on carbon stocks remain underexplored. This study evaluates the trade-offs between the economic benefits of bushmeat hunting and the potential carbon costs due to defaunation-induced biomass loss. Understanding these dynamics is critical for integrating hunting management into climate change mitigation strategies such as REDD+. Open access copy available |
Not Seeing the Forest for the Trees: The Oversight of Defaunation in REDD+ and Global Forest GovernanceBackgroundReducing Emissions from Deforestation and Forest Degradation (REDD+) is a global initiative aimed at mitigating climate change by preserving forest carbon stocks. While REDD+ has focused primarily on reducing deforestation, it largely ignores the role of defaunation—the loss of forest wildlife due to unsustainable hunting. Many tropical forests are increasingly experiencing "empty forest syndrome," where large frugivores and seed dispersers are being hunted out, leading to disruptions in seed dispersal and carbon sequestration. This study highlights how REDD+ policies fail to address the ecological role of forest fauna and argues that overlooking defaunation could compromise the long-term effectiveness of forest conservation efforts. Open access copy available |
Synergistic Effects of Seed Disperser and Predator Loss on Recruitment Success and Long-Term Consequences for Carbon Stocks in Tropical RainforestsBackgroundDefaunation—the loss of animal species due to hunting, habitat destruction, and other anthropogenic activities—has far-reaching consequences for tropical forests. Large frugivores play a crucial role in seed dispersal, while seed predators influence recruitment success and plant population dynamics. Previous studies have primarily focused on how defaunation affects seed dispersal, often overlooking the role of seed predators and potential compensatory effects within ecosystems. This study examines how the simultaneous loss of seed dispersers and seed predators affects tree recruitment and long-term carbon storage in tropical forests. Open access copy available |
The Need for Carbon Finance Schemes to Tackle Overexploitation of Tropical Forest WildlifeBackgroundOpen access copy available |
Contrasting Effects of Defaunation on Aboveground Carbon Storage Across the Global TropicsBackgroundOpen access copy available |
Fungi and Insects Compensate for Lost Vertebrate Seed Predation in an Experimentally Defaunated Tropical ForestBackgroundDefaunation, primarily caused by overhunting, is known to disrupt critical plant-animal interactions such as seed dispersal and seed predation. This can have cascading effects on plant regeneration, species composition, and even carbon storage. While previous studies have focused on the negative consequences of losing vertebrate seed dispersers and predators, it remains unclear whether other organisms, such as fungi and insects, can compensate for these losses. This study explores whether the decline of large vertebrate seed predators in a tropical rainforest is offset by increased seed predation from non-vertebrate sources, specifically insects and fungi. Open access copy available |
Size-Related Differential Seed Predation in a Heavily Defaunated Neotropical Rain ForestBackgroundDefaunation, driven by hunting and habitat loss, disproportionately affects medium and large mammals, often leaving behind a residual community dominated by small rodents. This shift in mammal communities can alter seed predation dynamics and impact forest regeneration. In heavily defaunated areas like Los Tuxtlas, Mexico, small rodents have become the primary seed predators. This study investigates whether seed predation patterns differ based on seed size in a highly defaunated forest. Specifically, it examines whether small rodents preferentially consume small seeds while large-seeded species escape predation, potentially influencing seed germination and plant recruitment. Open access copy available |
Seed dispersal strategies and the threat of defaunation in a Congo forestBackgroundSeed dispersal is a crucial ecological process that shapes plant communities and maintains biodiversity in tropical forests. In the Congo Basin, most tree species rely on animals (zoochory) to disperse their seeds, with large vertebrates like forest elephants and bonobos playing a key role. However, hunting and poaching threaten these seed dispersers, which could have cascading effects on forest structure and plant regeneration. This study investigates the extent of animal-mediated seed dispersal in the LuiKotale forest, located in the Democratic Republic of the Congo (DRC), and assesses how hunting pressure on frugivores may impact tree community composition. Available with subscription or purchase |
