Encontrados 12 documentos, a visualizar página 1 de 2
Fine‐scale variation in the medium and large‐sized mammal assemblage compositio...
Brandão, Fernanda Colares; Carvalho, William Douglas; Duarte, Herbert O. B.; Rosalino, L. M.; da Silva, Cláudia Regina; Hilário, Renato RichardUnderstanding fine-scale assemblage composition patterns of mammals is important to increase ecological knowledge and support conservation actions. We investigated whether β-diversity of medium and large-sized mammals and its components (replacement and richness difference) are related to distance to major rivers, height above the nearest drainage (HAND), and vegetation height; and whether species interactions ...
Spatiotemporal interactions between jaguars (Panthera onca) and their potential...
Duarte, Herbert O. B.; Rosalino, L. M.; de Toledo, José Júlio; Hilário, Renato Richard; Carvalho, William DouglasAlthough large carnivores usually prefer large prey, in some situations, they may shift their predation patterns towards smaller but abundant prey. The jaguar (Panthera onca) is a large carnivore capable of changing its diet according to prey and habitat availability. Here, we assessed the temporal and spatiotemporal interactions between jaguars and their prey in the Maracá-Jipioca Islands (Northeastern Amazon,...
A new tool to quantify biodiversity change under landscape transformation
Hilário, Renato Richard; Carvalho, William Douglas; Xavier, Bruna Da Silva; Palmeirim, Jorge M.; Vieira, Marcus Vinícius; Mustin, Karen; Cardoso, PedroIdentifying how species richness or diversity changes with different proportions of natural and anthropized environments in the landscape is important for landscape management for conservation. Here, we propose a new method to assess biodiversity changes in landscapes with varying proportions of habitat types. The algorithm is based on the resampling of individuals recorded in different habitats considering bot...
Pervasive gaps in Amazonian ecological research
Carvalho, Raquel L.; Resende, Angelica F.; Barlow, Jos; França, Filipe M.; Moura, Mario R.; Maciel, Rafaella; Alves-Martins, Fernanda; Shutt, JackBiodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...
Biased-corrected richness estimates for the Amazonian tree flora
ter Steege, Hans; Prado, Paulo I.; Lima, Renato A. F. de; Pos, Edwin; de Souza Coelho, Luiz; de Andrade Lima Filho, Diogenes; Salomão, Rafael P.Made available in DSpace on 2020-12-12T01:28:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Amazonian forests are extraordinarily diverse, but the estimated species richness is very much debated. Here, we apply an ensemble of parametric estimators and a novel technique that includes conspecific spatial aggregation to an exten...
Rarity of monodominance in hyperdiverse Amazonian forests
ter Steege, Hans; Henkel, Terry W.; Helal, Nora; Marimon, Beatriz S.; Marimon-Junior, Ben Hur; Huth, Andreas; Groeneveld, Jürgen; Sabatier, DanielMade available in DSpace on 2020-12-12T01:40:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-12-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Tropical forests are known for their high diversity. Yet, forest patches do occur in the tropics where a single tree species is dominant. Such “monodominant” forests are known from all of the main tropical regions. For Amazonia, we sam...
Biased-corrected richness estimates for the Amazonian tree flora
ter Steege, H.; Prado, Paulo I.; Lima, Renato A.Fde; Pos, Edwin T.; Coelho, Luiz Souza de; Lima Filho, Diógenes de Andrade; Salomão, Rafael PaivaAmazonian forests are extraordinarily diverse, but the estimated species richness is very much debated. Here, we apply an ensemble of parametric estimators and a novel technique that includes conspecific spatial aggregation to an extended database of forest plots with up-to-date taxonomy. We show that the species abundance distribution of Amazonia is best approximated by a logseries with aggregated individuals,...
Biodiversity, threats and conservation challenges in the Cerrado of Amapá, an A...
Mustin, Karen; Carvalho, William Douglas de; Hilário, Renato Richard; Costa-Neto, Salustiano Vilar da; Silva, Cláudia Regina; Vasconcelos, Ivan M.An Amazonian savanna in northern Brazil known as the Cerrado of Amapá is under imminent threat from poor land-use planning, the expansion of large-scale agriculture and other anthropogenic pressures. These savannas house a rich and unique flora and fauna, including endemic plants and animals. However, the area remains under-sampled for most taxa, and better sampling may uncover new species. We estimate that onl...
Deforestation control in the Brazilian Amazon: A conservation struggle being lo...
Carvalho, William Douglas de; Mustin, Karen; Hilário, Renato Richard; Vasconcelos, Ivan M.; Eilers, Vivianne; Fearnside, Philip MartinDespite efforts to reduce deforestation in the Brazilian Amazon, there has been an up-turn in clearing rates since 2012. These increases are in part due to failures in deforestation control. Soybean planters, cattle ranchers, and timber merchants find ways to circumvent agreements and legislation. Here we explain some of the key problems with the implementation of the principal agreements and Brazilian laws tha...
Rarity of monodominance in hyperdiverse Amazonian forests
ter Steege, H.; Henkel, Terry W.; Helal, Nora; Marimon, Beatriz Schwantes; Marimon Júnior, Ben Hur; Huth, Andreas; Groeneveld, Jürgen J.Tropical forests are known for their high diversity. Yet, forest patches do occur in the tropics where a single tree species is dominant. Such “monodominant” forests are known from all of the main tropical regions. For Amazonia, we sampled the occurrence of monodominance in a massive, basin-wide database of forest-inventory plots from the Amazon Tree Diversity Network (ATDN). Utilizing a simple defining metric ...