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| Registros recuperados: 620 | |
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| RUIZ GÓMEZ,Anderson; MANCERA PINEDA,José Ernesto. |
| ABSTRACT In the last decades, harmful algal blooms (HAB) and toxic events such as ciguatera seem to have increased in frequency and intensity, negatively impacting human health, economy, and marine ecosystems. In Colombia, these events have caused a series of consequences ranging from the death of fish and birds to toxic effects on humans. Although some toxin-producing dinoflagellate species are common in the Caribbean, their dynamics are poorly understood, making the adoption of any regulations difficult. To determine the composition and abundance of dinoflagellates associated with seagrasses we collected 18 samples on Isla de Barú, during 2015. We found ten diatom genera and three dinoflagellate genera, Prorocentrum, Ostreopsis, and Gambierdiscus, that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate change; Food poisoning; Marine phytoplankton; Microalgae phytoplankton abundance. |
| Ano: 2019 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2019000100109 |
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| Borburema,Henrique Douglas dos Santos; Lima,Ruth Pessoa de; Miranda,George Emmanuel Cavalcanti de. |
| ABSTRACT Global change and coastal eutrophication are affecting macroalgae worldwide. We analyzed the effects of increased water temperature (25, 28 and 32 °C) and eutrophication on the growth of Bostrychia binderi and Bostrychia montagnei in a range of salinities (18, 24, 30, 36 and 42 PSU) through three independent multifactorial experiments. Both species had higher growth at 25 °C than at 28 and 32 °C (warming scenario projected by IPCC), suggesting a negative effect of ocean warming. The species showed a broad tolerance to the range of salinities tested, with higher growth at 36 and 42 PSU, as a local adaptation strategy. Oligotrophic seawater significantly affected the growth of both species because the lowest growth was found in this condition,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bostrychia; Bostrychietum; Climate change; Ecophysiology; Estuarine macroalgae; Eutrophication; Global change; Growth; Salinity variation; Sea level rise. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400662 |
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| Maia,Renata A.; Fernandes,Geraldo W.; Silva,Advanio I. S.; Souza,João Paulo. |
| ABSTRACT This study evaluated the photochemical responses of photosystem II and growth of Hymenaea stigonocarpa under CO2-enriched conditions with exposure to simulated herbivory events. After herbivory simulation in two distinct parts of the stem of plants (apex and base), chlorophyll a fluorescence, chlorophyll index, growth, extrafloral nectary density, leaf mineral nutrition, and biomass production were evaluated. Plants of H. stigonocarpa grown under high [CO2] after simulated herbivory in the apical part of the stem had higher electron transport rate, effective quantum yield of photosystem II, and chlorophyll contents. However, simulated herbivory in the basal portion of plants grown under high [CO2] increased plant height, branch and root length,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass allocation; Cerrado; Climate change; Leaf damage; Leaf development. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300558 |
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| Blain, Gabriel Constantino. |
| The Mann-Kendall test has been widely used to detect trends in agro-meteorological as well as hydrological time series. Trend-free pre-whitening (TFPW-MK) is an approach that improves the performance of this test in the presence of serial correlation. The main goal of this study was to evaluate the ability of TFPW-MK to detect nonlinear trends. As a case study, this approach was also applied to 10-day values of precipitation (P), potential evapotranspiration (PE) and the difference between P and PE (P- PE) obtained from the weather station of Ribeirão Preto, State of São Paulo, Brazil. The results obtained from Monte Carlo simulations indicate that upward convex trends increase the power of this test, while upward concave trends decrease its power. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mann-Kendall; Serial correlation; Climate change. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/18199 |
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| Silva, Fabiola França; Mendes, Bruna Silva; Rocha, Maria Socorro; Brito Neto, José Félix; Beltrão, Napoleão Macêdo; Sofiatti, Valdinei. |
| The castor bean plant, a Euphorbiaceae oil seed C3-metabolism rustic and drought-resistant plant, is cultivated in a wide range of environments due to its good adaptive capacity. However, given the current environmental changes, many biochemical and physiological impacts may affect the productivity of important crops, such as castor bean. This work aimed to evaluate the impacts of the castor bean gas exchange in response to high temperature and increased CO2concentration.Our experiment was conducted in a phytotron located at Embrapa Algodão in 2010. We adopted a completely randomized design, with four treatments in a factorial combination of two temperatures (30/20 and 37/30°C) and two CO2 levels (400 and 800 mmol L-1); four replications were performed,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.03.00-8 castor bean; Climate change; Gas exchange; Photosynthesis; Chlorophyllssíntese clorofila 5.01.03.06-7. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19075 |
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| Monteiro, Alda Lúcia Gomes; Faro, Amanda Moser Coelho da Fonseca; Peres, Mylena Taborda Piquera; Batista, Rafael; Poli, Cesar Henrique Espirito Candal; Villalba, Juan Jose. |
| Global warming, as a consequence of excessive CO2 production mainly due to anthropogenic actions, is one of the main concerns of society due to the effects it can cause in the survival of humans, plants and animals. Several climatic consequences have already been reported, such as warming the oceans and changing biodiversity in various regions of the planet. One of the greenhouse gases responsible for global warming, which causes a lot of concern, is methane gas from digestion of food by ruminants. Besides that, emissions of greenhouse gases are represented also by waste management, rice cultivation, burning of residues from agriculture and soil management for agricultural production. Among ruminants, sheep and goats play an important economic role mainly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate change; Goats; Methane; Sheep.. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/43124 |
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| Sáenz-Romero,Cuauhtémoc; Beaulieu,Jean; Rehfeldt,Gerald E.. |
| Climatic change will decouple the matching between genotypes and environments. Studying the patterning of genetic variation among pine populations along altitudinal gradients under simulated climatic change temperatures, would provide insights about how to realign the present populations to future environments. Fourteen Pinus patula populations from the forests of the Native Indian Community of Ixtlán de Juárez, state of Oaxaca, México, were collected in January-March 2005 and 2006 along an altitudinal gradient (2400 m to 3050 m, one population every 50 m of altitudinal difference). Seedlings were grown in growth chambers at the Laurentides Forestry Center, Quebec city, Canada, under two temperature treatments aiming to simulate: contemporary temperature... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Altitudinal gradients; Altitudinal seed zoning; Assisted migration; Climate change; Genetic differentiation. |
| Ano: 2011 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000300012 |
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| ZANIN,MARINA; TESSAROLO,GEIZIANE; MACHADO,NATHÁLIA; ALBERNAZ,ANA LUISA M.. |
| ABSTRACT In the face of climate change threats, governments are drawing attention to policies for mitigating its effects on biodiversity. However, the lack of distribution data makes predictions at species level a difficult task, mainly in regions of higher biodiversity. To overcome this problem, we use native landcover as a surrogate biodiversity, because it can represent specialized habitat for species, and investigate the effects of future climate change on Brazilian biomes. We characterize the climatic niches of native landcover and use ecological niche modeling to predict the potential distribution under current and future climate scenarios. Our results highlight expansion of the distribution of open vegetation and the contraction of closed forests.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate change; Brazil; Ecological niche modeling; Native landcover; Biomes. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300939 |
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| Registros recuperados: 620 | |
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