Latin America and Caribbean
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 |
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 |
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 |
Using Janzen–Connell to predict the consequences of defaunation and other disturbances of tropical forestsBackgroundThe Janzen–Connell (J–C) model describes how seed dispersal and mortality shape tropical forest diversity. According to the model, seeds that fall close to their parent trees suffer high mortality due to host-specific predators, pathogens, and herbivores. In contrast, seeds dispersed farther away have a better chance of survival. Defaunation, particularly the loss of large-bodied seed dispersers, disrupts this balance by reducing seed dispersal distances. This study applies the J–C model to predict how defaunation and other disturbances affect tree recruitment and forest composition. Available with subscription or purchase |
Defaunation affects carbon storage in tropical forestsBackgroundTropical forests play a critical role in global carbon storage, holding approximately 40% of the Earth's terrestrial carbon. While deforestation, logging, and climate change are well-documented threats to these forests, the impact of defaunation (the loss of large frugivorous animals due to hunting and habitat loss) has been largely overlooked. Many large-seeded hardwood trees rely on large vertebrates for seed dispersal, and their decline could significantly affect forest composition and carbon storage. Open access copy available |
A Comparison of Governance Challenges in Forest Restoration in Paraguay’s Privately-Owned Forests and Madagascar’s Co-managed State ForestsBackgroundOpen access copy available |
Indigenous knowledge and the shackles of wildernessBackgroundOpen access copy available |
Soil organic carbon pool under native tree plantations in the Caribbean lowlands of Costa RicaBackgroundOpen access copy available |
Nitrogen Fixing Trees for Animal Production on Acid SoilsBackgroundNitrogen-fixing trees play a crucial role in improving pasture and livestock systems on acid soils, which are prevalent in tropical regions. Acid soils often challenge agricultural productivity due to low fertility and high aluminum toxicity. Nitrogen-fixing trees, such as Erythrina poeppigiana, Cratylia argentea, and Alnus acuminata, enhance soil chemistry and fertility by adding nitrogen through organic matter and improving physical soil properties like porosity and bulk density. They are integrated into silvopastoral systems, where trees and shrubs coexist with pastures, offering multiple benefits such as soil stabilization, increased forage quality, and diversified farm outputs. Open access copy available |
