Results 31 to 40 of about 3,318 (151)

Land use drives change in amazonian tree species

Anais da Academia Brasileira de Ciências
: The Amazonian rainforest has been subjected to exceptionally high rates of land use change (LUC), primarily for pasture. We present here an analysis of the impact of LUC on trees from studies made in Pará state.
IMA CÉLIA G. VIEIRA
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An evolutionary and ecological perspective of Amazonian Hylaea species of Hymeneae (Leguminosae: Caesalpinioideae) [PDF]

Acta Amazonica, 1973
The resin-producing genus Hymenaea has an amphi-Atlantic distribution with 13 species being Neotropical and one occurring along the eastern coast of Africa.
Jean H. Langenheim, Yin-Tse Lee, Susan S. Martin   +2 more
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Structure and function of soil fauna communities in Amazonian anthropogenic and natural ecosystems [PDF]

European Journal of Soil Biology, 2001
The soil biological conditions of two 5-year-old polyculture tree plantations in Amazonia were studied comparatively to a 13-year-old secondary forest and a nearby undisturbed primary forest. The polycultures had been planted to regenerate the soil degraded by land preparation and a former rubber tree monoculture.
Höfer, Hubert, Hanagarth, Werner, Garcia, Marcos Vinicius Bastos, Martius, Christopher, Franklin, E., Römbke, Jörg, Beck, Ludwig   +6 more
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Multiple primary cutaneous melanoma in the amazon region of Peru

Anales de la Facultad de Medicina
We report an 82-year-old male from Iquitos, Amazon region of Peru, with a three-month history of mild-tomoderate painful skin lesions on the right lower limb.
Rocío Laureano Suárez, José Camones Huerta, Nazario Ortíz Muchotrigo, Edgar A. Ramírez García, Martín Casapía Morales   +4 more
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Piranhas (Serrasalmus spp.) as markers of mercury bioaccumulation in Amazonian ecosystems

Ecotoxicology and Environmental Safety, 2004
Mercury (Hg) concentration in fish depends on feeding strategies and age/size within the species as well as on water parameters related to acidity and Hg speciation. We chose two species of piranhas (Serrasalmus aff. eigenmanni and Serrasalmus rhombeus) to test their suitability as markers of Hg bioaccumulation.
José G, Dórea, Antonio C, Barbosa, Jurandir, Souzade, Pedro, Fadini, Wilson F, Jardim   +4 more
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Determinants of anuran assemblages in Amazonian White-sand Ecosystems

Anais da Academia Brasileira de Ciências
Amazonian white-sand ecosystems have predominantly sandy soils and a high amount of endemism, and several species found within them are adapted to long periods of drought. However, little is known about the variation in the structure of anuran assemblages in these ecosystems.
RAFAELA CAROLINE S. PEREIRA, JUSSARA S. DAYRELL, RAMIRO DÁRIO MELINSKI, ALBERTINA P. LIMA   +3 more
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Response of testate amoebae to a late Holocene ecosystem shift in an Amazonian peatland [PDF]

European Journal of Protistology, 2018
To date there have only been two studies using testate amoebae as palaeoecological indicators in tropical peatlands. Here we present a new ∼500-year testate amoeba record from San Jorge, a domed peatland in Peruvian Amazonia, which has a well-constrained vegetation history based on pollen analysis. We observe a major shift from Hyalosphenia subflava to
Graeme T. Swindles, Thomas J. Kelly, Katherine H. Roucoux, Ian T. Lawson   +3 more
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Influence of air pollutants on pneumonia hospitalizations among children in a town in the Brazilian Legal Amazon region: a time series study

São Paulo Medical Journal
BACKGROUND: Exposure to particulate material produced as a result of increased agricultural activity may increase the number of pneumonia hospitalizations among children. We hope to contribute to the knowledge base through highlighting the environmental
Danila Pequeno Santana, Viviane Martins Santos, Ageo Mário Cândido da Silva, Walkiria Shimoya-Bittencourt   +3 more
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The strengthening of Amazonian precipitation during the wet season driven by tropical sea surface temperature forcing

Environmental Research Letters, 2018
Amazonian rainfall plays a critical role in the global climate system and the hydrological cycle. It is thus important to quantify changes in the Amazonian rainfall and clarify its mechanism.
Xin-Yue Wang, Xichen Li, Jiang Zhu, Clemente A S Tanajura   +3 more
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Effects of climate variability and disturbances on the Amazonian terrestrial ecosystems dynamics [PDF]

Global Biogeochemical Cycles, 2002
This article examines how climate variability and ecological disturbances affect ecosystem composition and functioning in the Amazon region. We use a terrestrial ecosystem model, IBIS, and vary the treatment of climate (using either long‐term average climate, or actual historical variations in climate) and disturbances (with uniform disturbance rates ...
Aurélie Botta, Jonathan A. Foley
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