Esteban Payán
Valeria Boron- Panthera, New York, NY, United States
We assume conservation lessons learnt from Southeast Asia adapted to the growing body of knowledge in oil palm impacts in Colombia, and adapt it to the Neotropical realm with a focus on mammals. Aspects of science, policy, and practice are reviewed. Colombia is the fourth largest producer of palm oil in the world with a growth of 42% in 2017, affecting its ecosystems and biodiversity. In order to prevent large mammal species erosion and decimation as has happened in SE Asia, the following lessons in zoning, infrastructure, harvest, monitoring, and research should be implemented. Native habitat is irreplaceable. New oil palm frontiers should occur in degraded ecosystems, with adequate governance and without requirement of new infrastructure. Roads favor hunting, logging, and disorganized human occupation. Plantations should conserve water bodies and forests to ensure connectivity and refuge for sensitive mammal species. Higher structural complexity with added plants is desired for a varied mammal species composition. Harvest should be done manually and crepuscular work hours should be avoided. How new oil palm frontiers are opened and developed will define the extent of alteration of natural mammal assemblages, the intensity of mesopredator release affecting other species from cascading trophic phenomenon and even the continuation of key large iconic herbivores and carnivores.
Introduction
Agricultural expansion, including oil palm, is driving severe habitat loss and degradation, threatening biodiversity worldwide (Balmford et al., 2012; Vijay et al., 2016). This is particularly concerning for the equatorial countries given their extremely rich in biodiversity and the unprecedented land cover change (Laurance et al., 2014). Latin America is poised to be the second largest oil palm producing region in the world after Southeast Asia (SE Asia) (Furumo and Aide, 2017). Colombia is the 4th largest palm oil producer in the world, followed closely by Honduras, Perú, and Guatemala, with growing productions from Ecuador and Brazil.
Forest and other well-conserved ecosystems falling to oil palm conversion are a critical threat to mammal conservation. This has been evidenced in SE Asia with the local extinctions, mammal assemblage alterations, and dwindling population of large mammals (Clements et al., 2010; Wilcove et al., 2013). Mammals make significant contributions to ecosystem functioning including trophic regulation, nutrient cycling, carbon storage, seed dispersal, and ultimately maintenance of forest (Terborgh and Estes, 2013). Amongst mammals, large-bodied ones play a focal species role and are especially vulnerable to habitat loss (Ripple et al., 2014). Mammals are ideal as a proxy for sustainability since they have some of the highest extinction risk predictor among taxa, especially from human activity, as has been evidenced through history, and as terrestrial dwellers are strongly impacted by oil palm plantation and easily monitored with camera traps (Cardillo et al., 2005; Fitzherbert et al., 2008; Koh and Wilcove, 2008).
We assume conservation lessons learnt from SE Asia adapted to the growing body of knowledge in oil palm impacts in Colombia, and adapt it to the Neotropical realm with a focus on mammals. Here we synthesize these in a perspective piece to infer ways to minimize impact in the expected increase of oil palm in the Neotropics and achieve more sustainable agricultural landscapes.
Landscape Zoning to Lessen the Impact of Oil Palm
In Southeast Asia and South America, 45 and 31%, respectively, of sampled oil palm plantations came from areas that were forests in 1989 (Vijay et al., 2016). Indonesia lost 70% of its lowland forests (1990–2005) to deforestation, largely led by establishment of oil palm plantations (Carlson et al., 2013). Southeast Asia had 6% (~880,000 ha) of tropical peatland converted to oil palm by 2005, with an estimated species loss of ~12% (Koh et al., 2011). Oil palm production is rapidly expanding in Latin America (Furumo and Aide, 2017) and ensuring that this expansion is not met at the expense of tropical forest habitat and mammal biodiversity should represent a regional conservation priority. Based on a sample of 342,032 ha of oil palm plantations across Latin America, Furumo and Aide (2017), found that 79% replaced previously intervened lands, which is ideal, but the remaining 21% came from deforestation, most notably in the Amazon and the Petén region in northern Guatemala. In Colombia, of the 155,100 ha of new oil palm plantations between 2002 and 2008, 16.1% occurred in forests and natural savannas (Castiblanco et al., 2013). In the Peruvian Amazon, Gutiérrez-Vélez et al. (2011) assessed the area deforested by industrial-scale high-yield oil palm expansion between 2000 and 2010, finding that 72% of new plantations expanded into forested areas. New oil palm frontiers should occur in degraded ecosystems, with adequate soils, local governance and without the requirement of new infrastructure. Road creation and upgrading is a catalyst for both habitat loss and overhunting, two major drivers of mammal extinction. Roads bring access to loggers, hunters, poachers, and general human occupation directly decimating mammal population, creating avoidance gaps, and fragmenting and eroding their habitats (Laurance et al., 2014). Unpaved roads are more wildlife-friendly than paved ones, and a more sustainable option for the oil palm sector, since the product is not perishable.
Many areas with climatic suitability for oil palm in the Neotropics retain extensive cover of primary forests, and therefore have major conservation value (Butler and Laurance, 2009). The Neotropics have enough over grazed and poorly farmed lands to spare for oil palm cultivation (Wassenaar et al., 2007; Garcia-Ulloa et al., 2012). Also, research demonstrated that pastures have low conservation value for several taxa in Colombia (Gilroy et al., 2015; Boron et al., 2019), and conversion to oil palm plantations could, in theory, improve this for generalist mesopredator species like ocelots (Leopardus pardalis) (see below). However, intensifying use of the land will lessen the impact of agriculture on natural ecosystems only if coupled with effective land-use planning at all scales of development (Laurance et al., 2014). This, however, is not the current case. Governments see the social and economic benefits of oil palm expansions, and benefit the sector with subsidies and incentives (Rist et al., 2010; Boron et al., 2016). This is aggravated by poor land governance, deficient enforcement, weak institutions, and corruption (Boron et al., 2016). Both stronger regulatory frameworks and incentive-based approaches could facilitate land-use planning and help preserve natural areas.
Native Forest is Irreplaceable
Native forest biodiversity is not as high in selective logged forest, secondary forest, oil palm, or natural savannas (Gibson et al., 2011). Conversion of forest to oil palm plantations causes irreplaceable biodiversity loss (Wilcove et al., 2013). Large mammalian herbivores and carnivores depend on intact forest for reproduction and long-term survival.
Studies in Asia have revealed severe declines in abundance and species richness in oil palm relative to forests (Edwards et al., 2010; Yue et al., 2015). In Colombia, mammal richness was significantly lower (−47%) in oil palm areas when compared to adjecent riparian forest and when oil palm cover reaches 45–75%, mammal species composition drastically changes (Pardo and Payán, 2015; Pardo et al., 2018a,b). Research also showed that forest areas and wetlands increase occupancy, relative abundance, and are key core areas for jaguars (Panthera onca), pumas (Puma concolor), ocelots, jaguarundis (Herpailurus yagouaroundi), other mesopredators, and medium rodents (Diaz-Pulido and Payán, 2011; Boron and Payán, 2013; Boron et al., 2018). These species will use the oil palm agro habitat only marginally. These findings suggest that maintaining forest and wetland habitat in modified landscapes is crucial for both the wild felid guild and their prey.
These examples show how irreplaceable native forest is in comparison to oil palm of multiple ages. In light of rapidly expanding agriculture across the Neotropics, these findings can inform land use planning and conservation policies in Latin America.
Management of oil Palm Plantations
Mammals are wide ranging; hence, their conservation should be done at landscape-wide scale and involve land use planning and forest conservation inside and outside plantations. Here, oil palm plantation best practices have a key role.
The following landscape variables in Colombia define a great deal of the sustainability of oil palm plantations for mammals: the size of plantations, distance to well-conserved forest patches or mosaic of plantations with forests. This agrees with research in Southeast Asia where small plantations are viable refuges for small and medium mammals, where small plantations close to well-conserved forest will sustain richer biodiversity (Azhar et al., 2014, 2015). Large mammals such as tiger (Panthera tigris) (Sunarto et al., 2012), sun bears (Helarctos malayanus), or orangutans (Pongo spp.) disperse into mature plantations and will use them as long as they are close to well-conserved forest (Ancrenaz et al., 2015). Sunarto and colleagues highlight that with adjustments in plantation management, tigers could use mosaics of plantations (as additional roaming zones), riparian forests (as corridors), and smaller forest patches (as stepping stones), potentially maintaining a metapopulation structure in fragmented landscapes. In the Colombian llanos when oil palm cover increased to 75% or more, almost the entire terrestrial mammal community declined abruptly (Pardo et al., 2018b).
As with any crop, oil palm should not be planted homogeneously over entire landscapes, but rather within mosaic landscapes together with well-conserved native habitats. Plantation design should maintain appropriate native vegetation buffer zones between plantations, respecting patches and riparian corridors, distances from plots to riverbeds, conserve existing water bodies, and implement drop or localized irrigation to ensure connectivity and refuge for sensitive mammal species. Proximity to water significantly increased Neotropical mammal community occupancy in Colombia (Boron et al., 2019). Positive associations of mammals with water likely reflect the use of riparian forests for movement and dispersal as these forests tend to be the only ones to remain in modified landscapes.
Plantations with more complex understory and general heterogeneous structures are richer in mammals as seen in SE Asia and in Colombia (Azhar et al., 2015; Pardo and Payán, 2015; Pardo et al., 2018a). This might also protect the oil palms from insectivory (Koh, 2008) and presumably other disease and pests. Harvest should be done manually to maximize employment and minimize machinery. Crepuscular and night-time work hours should be avoided so that mammals may adapt to circadian activity rhythms with minimum disturbance and noise. Human disturbance not only alters natural mammal activity patterns, but can also increase competition due to this alteration (Bennie et al., 2014). Drainage canals should have crossing structures for land animals and low angle borders for water dwelling ones. Stakeholders should ensure zero hunting, low speed on roads and no burning.
Many of the above recommendations and others are included in the Roundtable for Sustainable Palm Oil (RSPO) standards. RSPO Certification can certainly provide socio-environmental benefits, however there are doubts as to the effectiveness of RSPO, since evidence has shown no significant difference between certified and non-certified plantations for several sustainability metrics (Morgans et al., 2018) and non-certified small holders in Asia have been recognized as more biodiversity-friendly than certified large ones (Azhar et al., 2017). Furthermore mammal and biodiversity conservation depends on larger landscape scales thus certification should either be linked with broader landscape management approaches and/or the landscape itself should be considered as the certified unit (Tscharntke et al., 2015).
In Latin America, 22% of the palm oil is RSPO certified and growing in numbers, especially in in Brazil, Ecuador, Colombia, Honduras, Guatemala, and Costa Rica [Roundtable on Sustainable Palm Oil (RSPO), 2019]. For example, in Ecuador, the government, civil society and palm oil producers committed to a RSPO Jurisdictional Certification, the first in Latin America. This has the potential to inspire other countries and implement RSPO's principle and criteria at the national level, involving all the stakeholders, large and small, in the production chain [Roundtable on Sustainable Palm Oil (RSPO), 2019]. Initiatives like these, should be coupled with other best practices and standards to increase their effect in wildlife conservation, such as strict adherence to No Deforestation, No Peat, No Exploitation (NDPE) policies by growers, traders and downstream companies, and best practice supervision by NGO's and the public with tools such as ZSL's Sustainability Policy Transparency Toolkit (SPOTT).
Extinction and Mesopredator Release
Several mammals are being pushed toward extinction in SE Asia thanks to oil palm's appalling deforestation practices (Clements et al., 2010). The critically endangered Bornean orangutan (P. pygmaeus) have been decimated by up to 100,000 individuals in 16 years by logging, deforestation and industrialized plantations modeling (Voigt et al., 2018). Habitat loss from oil palm is yet another threat to the already dwindling tiger, currently reduced to surviving in protected areas and forest patches (Harihar et al., 2018). To thrive, tigers depend on the existence of large contiguous forest blocks (Sunarto et al., 2012). The future of oil palm practices in SE Asia is thus intimately tied to the survival of these two iconic mammalian species.
For the Neotropical large mammals there is still some time. However, given their size and needs for abundant prey in vast tracts of well-conserved lowland habitats, jaguars are the obvious first mammal species in line of threat from the advancement of oil palm. For this apex carnivore, long term, large enough territories are now in short supply and dwindling (Payán et al., 2012). The species' connectivity currently depends on unprotected lands as a complement to the existing protected areas. Jaguars will use oil palm marginally and cross it, but will not live inside oil palm plantations (Boron et al., 2018). Furthermore, with oil palm come roads, that are actively avoided by females (Conde et al., 2010) and influence jaguar density negatively (Espinosa et al., 2018). The reduction of the jaguar's habitats in the lowland Neotropics will be accelerated by the advancement of oil palm.
Mesopredator release has been recorded inside agricultural lands, and oil palm plantations are no exception. It occurs when large native carnivores are locally extinct and mesopredators thrive in their absence (Crooks and Soulé, 1999). This phenomenon increases pressure on the mesopredator's prey altering their natural abundance and disturbing communities of the preexisting biodiversity (Courchamp et al., 1999). Medium sized carnivores, such as leopard cats (Prionailurus bengalensis) and common civets (Paradoxurus hermaphroditus) use, hunt and are more abundant inside oil palm plantations in Southeast Asian plantations (Rajaratnam et al., 2007; Mohamed et al., 2013; Jennings et al., 2015; Chua et al., 2016). In the Neotropics, ocelots, jaguarundis and crab-eating foxes (Cerdocyon thous) are experimenting increased abundances in oil palm plantations (Boron and Payán, 2013; Pardo and Payán, 2015; Pardo et al., 2018a; Boron et al., 2019). The nocturnal and adaptive ocelot (6–12 kg) seem to be the counterpart to the nocturnal and highly adaptive leopard cat (2–7 kg) in Asia, both species which have adapted to eating rodents inside plantations. The impact of mesopredator releases on other biodiversity certainly warrants further research.
Concluding Remarks
How new oil palm frontiers are opened and developed will define the extent of alteration of natural mammal assemblages, the intensity of mesopredator release affecting other species from cascading trophic phenomenon and even the continuation of key large iconic herbivores and carnivores. Thus, zoning with planned development, design of plantations respecting forest and water sources, best harvest practices and continued mammal monitoring in small plantations, in a mosaic landscape with natural forest, will be able to retain key mammal species and have a lessened impact on mammal biodiversity on the whole. Stricter certification is needed with verifiable results on wildlife conservation. Application of the abovementioned tactics will consolidate a more sustainable strategy for the future of mammals in oil palm landscapes in mega-diverse countries in the Neotropics. The increase of oil palm cultivation area in Latin America still has the unique opportunity to be done sustainably. We conclude that effectively conserving wild biodiversity in agricultural landscapes will require increased research, policy coordination and application, and strategic support to agricultural communities and conservationists.
Author Contributions
EP and VB contributed to conception, design of the study, assembled relevant literature, and manuscript revision, read, and approved the submitted version. EP wrote the first draft of the manuscript. VB wrote sections of the manuscript.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Acknowledgments
Thank you to the editors for inviting us to submit this perspective. The authors are also grateful to J. Lizarazo, H. Robinson, and our previous coauthors and collaborators in oil palm papers.
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Keywords: agriculture, Panthera onca, Colombia, pastures, sustainability, mesopredators, vertebrates, Panthera tigris
Citation: Payán E and Boron V (2019) The Future of Wild Mammals in Oil Palm Landscapes in the Neotropics. Front. For. Glob. Change 2:61. doi: 10.3389/ffgc.2019.00061
Received: 27 April 2019; Accepted: 16 September 2019;
Published: 11 October 2019.
Edited by:
Katharine Anne Abernethy, University of Stirling, United KingdomReviewed by:
Badrul Azhar, Putra Malaysia University, MalaysiaAndres Etter, Pontifical Javeriana University, Colombia
Copyright © 2019 Payán and Boron. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Esteban Payán, epayan@panthera.org