• 2013 Reporte Manu: Pasión por la Investigación en la Amazonia Peruana

      San Diego Zoo Global PERU; Servicio Nacional de Áreas Naturales Protegidas (Peru); Groenendijk, Jessica; Tovar, Antonio; Wust Edicciones; San Diego Zoo Global PERU; Servicio Nacional de Áreas Naturales Protegidas (Peru) (San Diego Zoo Global Peru : SERNANPLima, 2013)
      Summarizes the main findings of research carried out at Cocha Cashu and the wider Manu Biosphere Reserve, roughly since 2000, with sections on forest and aquatic ecology, fauna, and the human dimension.
    • A diversity of biogeographies in an extreme Amazonian wetland habitat

      Householder, Ethan; Janovec, John; Tobler, Mathias W.; Wittmann, Florian; Myster, Randall W. (John Wiley & Sons, Ltd, 2017)
      Amazonian wetlands are associated with lower species diversity relative to surrounding terra firme forests, as well as compositional turnover along strong hydro-edaphic gradients. Because species differ in their ecophysiological response to soil waterlogging, hydrological regime is likely a major determinant of the local diversity, species distribution and assemblage of plant communities in wetland habitats....
    • Coevolution of vocal signal characteristics and hearing sensitivity in forest mammals

      Charlton, Benjamin D.; Owen, Megan A.; Swaisgood, Ronald R. (2019)
      Although signal characteristics and sensory systems are predicted to co-evolve according to environmental constraints, this hypothesis has not been tested for acoustic signalling across a wide range of species, or any mammal sensory modality. Here we use phylogenetic comparative techniques to show that mammal vocal characteristics and hearing sensitivity have co-evolved to utilise higher frequencies in forest environments – opposite to the general prediction that lower frequencies should be favoured in acoustically cluttered habitats. We also reveal an evolutionary trade-off between high frequency hearing sensitivity and the production of calls with high frequency acoustic energy that suggests forest mammals further optimise vocal communication according to their high frequency hearing sensitivity. Our results provide clear evidence of adaptive signal and sensory system coevolution. They also emphasize how constraints imposed by the signalling environment can jointly shape vocal signal structure and auditory systems, potentially driving acoustic diversity and reproductive isolation.
    • Devastating decline of forest elephants in Central Africa

      Maisels, F.; Strindberg, S.; Blake, S.; Wittemyer, G.; Hart, J.; Williamson, E. A.; Aba'a, R.; Abitsi, G.; Ambahe, R. D.; Amsini, F.; et al. (2013)
      African forest elephants-taxonomically and functionally unique-are being poached at accelerating rates, but we lack range-wide information on the repercussions. Analysis of the largest survey dataset ever assembled for forest elephants (80 foot-surveys; covering 13,000 km; 91,600 person-days of fieldwork) revealed that population size declined by ca. 62% between 2002-2011, and the taxon lost 30% of its geographical range. The population is now less than 10% of its potential size, occupying less than 25% of its potential range. High human population density, hunting intensity, absence of law enforcement, poor governance, and proximity to expanding infrastructure are the strongest predictors of decline. To save the remaining African forest elephants, illegal poaching for ivory and encroachment into core elephant habitat must be stopped. In addition, the international demand for ivory, which fuels illegal trade, must be dramatically reduced.
    • Do responsibly managed logging concessions adequately protect jaguars and other large and medium-sized mammals? Two case studies from Guatemala and Peru

      Tobler, Mathias W.; Garcia Anleu, Rony; Carrillo-Percastegui, Samia E.; Ponce Santizo, Gabriela; Polisar, John; Zuñiga Hartley, Alfonso; Goldstein, Isaac (2018)
      Large areas of tropical forest have been designated for timber production but logging practices vary widely. Reduced-impact logging is considered best practice and third-party certification aims to ensure that strict standards are met....
    • Does forest management and researchers’ presence reduce hunting and forest exploitation by local communities in Tsitongambarika, south-east Madagascar?

      Campera, Marco; Phelps, Megan; Besnard, Fiona; Balestri, Michela; Eppley, Timothy M.; Nijman, Vincent; Donati, Giuseppe (2019)
      Hunting of wildlife is one of the major threats to biodiversity. For effective conservation programmes in countries where hunting and shifting agriculture are the main sources of subsistence, forest management should aim to reduce hunting pressure and forest exploitation....
    • Harpy eagles (Harpia harpyja) nesting at Refugio Amazonas, Tambopata, Peru feed on abundant disturbance-tolerant species

      Bowler, Mark; Couceiro, Daniel; Martinez, Rocio; Orihuela, Gabriela; Shoobridge, Juan Diego; Nycander, Eduardo; de Miranda, Everton B. P.; Tobler, Mathias W. (2020)
      The harpy eagle (Harpia harpyja) is one of the main predators of arboreal mammals in the neotropics, affecting the ecology and behaviour these species. Knowledge of harpy eagle diets across their geographical range is patchy, the ability of harpy eagles to adapt to changing habitats is still open to question….
    • Seed dynamics of an endemic palm in a Northwestern Mexican tropical dry forest: implications for population spatial structure

      López-Toledo, Leonel; Portillo-Cruz, Y.; Pulido, M.T.; Endress, Bryan A. (2013)
      Seed dynamics are an important part of the life history of plants and may have strong implications on abundance and spatial distribution of populations. In this study, we explored how seed dynamics (removal, predation, germination) interact with micro-environmental conditions to affect the spatial structure of populations of Brahea aculeata (Arecaceae) in a tropical dry forest. B. aculeata is distributed throughout arroyo basins and attains its highest densities near to arroyos/rivers....
    • Soil and species effects on bark nutrient storage in a premontane tropical forest

      Jones, Jennifer M.; Heineman, Katherine D.; Dalling, James W. (2019)
      Background and aims Bark contains a substantial fraction of the nutrients stored in woody biomass, however the degree of functional coordination of bark, wood, and foliar nutrient pools, and its relationship to soil nutrient availability remains poorly understood....
    • Terrestrial locomotion and other adaptive behaviors in howler monkeys (Alouatta pigra) living in forest fragments

      Serio-Silva, J. C.; Ramirez-Julian, R.; Eppley, Timothy M.; Chapman, C. A.; Reyna, R.; Chapman, C. A. (Springer NatureNew York, 2019)
      Howler monkeys (Alouatta spp.) are arguably one of the most successful primates in coping with highly fragmented habitats because of their flexible, yet mainly folivorous, diet. While they are able to survive, many other arboreal primate species appear to gradually disappear from these anthropogenic landscapes....