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Faculty of Mathematics and Natural Sciences - Biogeography

Faculty of Mathematics and Natural Sciences | Geography Department | Biogeography | News | Increasing joint impacts of habitat destruction and hunting on mammals in the Gran Chaco

Increasing joint impacts of habitat destruction and hunting on mammals in the Gran Chaco

 

Alfredo Romero-Muñoz, Ana Benítez-López, Damaris Zurell, Matthias Baumann, Micaela Camino, Julieta Decarre, Hugo del Castillo, Anthony J. Giordano, Bibiana Gómez-Valencia, Christian Levers, Andrew J. Noss, Verónica Quiroga, Jeffrey J. Thompson, Ricardo Torres, Marianela Velilla, Andrea Weiler & Tobias Kuemmerle

 

Summary: Habitat destruction and overexploitation – the main threats to biodiversity worldwide – are increasingly affecting several mammal species in the same areas. In such areas, the total effect of both threats may be even larger than the sum of the parts, likely resulting in fast biodiversity loss. Our work identifies priority areas for protection, as well as hotspots were one or both threats should be managed in order to save the imperiled biodiversity of the Chaco.

 

Abstract: Habitat destruction and overexploitation are the main threats to biodiversity and where they co‐occur, their combined impact is often larger than their individual one. Yet, detailed knowledge of the spatial footprints of these threats is lacking, including where they overlap and how they change over time. These knowledge gaps are real barriers for effective conservation planning. Here, we develop a novel approach to reconstruct the individual and combined footprints of both threats over time. We combine satellite‐based land‐cover change maps, habitat suitability models and hunting pressure models to demonstrate our approach for the community of larger mammals (48 species > 1 kg) across the 1.1 million km2 Gran Chaco region, a global deforestation hotspot covering parts of Argentina, Bolivia and Paraguay. This provides three key insights. First, we find that the footprints of habitat destruction and hunting pressure expanded considerably between 1985 and 2015, across ~40% of the entire Chaco – twice the area affected by deforestation. Second, both threats increasingly acted together within the ranges of larger mammals in the Chaco (17% increase on average, ± 20% SD, cumulative increase of co‐occurring threats across 465 000 km2), suggesting large synergistic effects. Conversely, core areas of high‐quality habitats declined on average by 38%. Third, we identified remaining priority areas for conservation in the northern and central Chaco, many of which are outside the protected area network. We also identify hotspots of high threat impacts in central Paraguay and northern Argentina, providing a spatial template for threat‐specific conservation action. Overall, our findings suggest increasing synergistic effects between habitat destruction and hunting pressure in the Chaco, a situation likely common in many tropical deforestation frontiers. Our work highlights how threats can be traced in space and time to understand their individual and combined impact, even in situations where data are sparse.

 

Link to the manuscript: https://doi.org/10.1111/ecog.05053

 

Citation: Romero‐Muñoz, A., Benítez‐López, A., Zurell, D., Baumann, M., Camino, M., Decarre, J., … Kuemmerle, T. (2020). Increasing synergistic effects of habitat destruction and hunting on mammals over three decades in the Gran Chaco. Ecography, 1–13. https://doi.org/10.1111/ecog.05053