The Neotropical little fire ant, Wasmannia auropunctata, is notorious for its negative impacts on the native biota of tropical islands, such as the Galapagos and New Caledonia, where it has been introduced. Here, I evaluate the impact of exotic W. auropunctata populations on continental Africa. I surveyed ants at nine sites in Lopé National Park in Gabon, Central Africa, and found a highly significant correlation between ant diversity and length of infestation by W. auropunctata. I found many more native ant species present in areas not infested with W. auropunctata (39.0 ± 4.6) compared with areas infested by W. auropunctata for approximately 5–10 yr (7.0 ± 6.2 and 1.7 ± 1.2, respectively). In infested areas, W. auropunctata made up the bulk of specimens collected in every plot. This study demonstrates that the threat posed by W. auropunctata to biodiversity is as serious in continental ecosystems as it is in the more fragile island ecosystems of previous studies. Introductions near waterways are particularly devastating: in Lopé, the infested territory is most extensive along waterways and occurs in a pattern that strongly suggests moving water facilitates colonization.
Crop raiding by wildlife decreases agricultural productivity and hinders efforts to reduce poverty throughout the world and especially in Africa. Efforts to reduce crop raiding in developing countries generally involve prescriptive "low-cost" protection methods at the level of the individual farm, under the assumption that monetary capital and knowledge are the principal limiting factors in farmers' adoption of protection methods. This article highlights the importance of considering labor costs in addition to monetary costs when assessing the adoptability of protection strategies. Benefit-cost analysis is used to inform a theoretical model of the likelihood of farmer adoption of methods to protect crops against elephants in Gabon. Supported by empirical findings from a binomial logit model of farmers' protection decisions, this analysis elucidates the low rate of adoption for known protection methods in Gabon. While the empirical data are specific to Gabon, this analysis frames a reflection process regarding labor optimization and alternative strategies that applies broadly.JEL classifications: Q12, Q16
Scabies is a contagious skin infestation caused by tiny mites.The microscopic, 8-legged human itch mite digs into the skin to feed and lay eggs; however, it cannot survive outside human skin for more than 2 to 3 days. Scabies is transmitted by direct person-to-person contact or through objects that carry the mites, such as clothing and bedding. Scabies can affect anyone but is most common in children and crowded populations, such as jails, refugee camps, and nursing homes. Because scabies is a human parasite, household pets are typically not affected. Most people with scabies have fewer than 100 mites. However, the itching and rash can be everywhere.Norwegian scabies, or crusted scabies, is a severe infestation of hundreds to thousands of mites that appears as a thick, yellow-gray crust on the skin. It occurs in elderly people or those with disabilities who cannot scratch or feel the itch. It also occurs in those with weakened immune systems.
Context Tropical forest loss has a major impact on climate change. Secondary forest growth has potential to mitigate these impacts, but uncertainty regarding future land use, remote sensing limitations, and carbon model accuracy have inhibited understanding the range of potential future carbon dynamics. Objectives We evaluated the effects of four scenarios on carbon stocks and sequestration in a mixed-use landscape based on Recent Trends (RT), Accelerated Deforestation (AD), Grow Only (GO), and Grow Everything (GE) scenarios. Methods Working in central Panama, we coupled a 1-ha resolution LiDAR derived carbon map with a locally derived secondary forest carbon accumulation model. We used Dinamica EGO 4.0.5 to spatially simulate forest loss across the landscape based on recent deforestation rates. We used local studies of belowground, woody debris, and liana carbon to estimate ecosystem scale carbon fluxes. Results Accounting for 58.6 percent of the forest in 2020, secondary forests (< 50 years) accrue 88.9 percent of carbon in the GO scenario by 2050. RT and AD scenarios lost 36,707 and 177,035 ha of forest respectively by 2030, a carbon gain of 7.7 million Mg C (RT) and loss of 2.9 million Mg C (AD). Growing forest on all available land (GE) could achieve 56 percent of Panama’s land-based carbon sequestration goal by 2050. Conclusions Our estimates of potential carbon storage demonstrate the important contribution of secondary forests to land-based carbon sequestration in central Panama. Protecting these forests will contribute significantly to meeting Panama’s climate change mitigation goals and enhance water security.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.