266 results found
de Santana CS, Lira SMDA, Varona HL, et al., 2020, Amazon river plume influence on planktonic decapods in the tropical Atlantic, Journal of Marine Systems, Vol: 212, ISSN: 0924-7963
© 2020 Elsevier B.V. The western tropical Atlantic is strongly influenced by the Amazon, receiving the full discharge from the largest river basin of the world. In order to ascertain the coastal-oceanic gradient in abundance and composition of planktonic decapod communities along the Amazon River Plume (ARP) and its retroflection, 33 plankton samples were obtained along three sampling transects: Coastal and oceanic area influenced by the ARP (Coastal IARP and Ocean IARP, respectively), and oceanic waters without ARP influence (Ocean). A total of 13,117 specimens, belonging to 33 taxa, were analyzed. The distribution of planktonic decapod communities was strongly influenced by the Amazon discharge, showing the following patterns: (1) The coastal-oceanic gradients in decapod abundance are similar to other shelf areas of eastern South America, with higher abundance in the area under ARP influence, (2) meroplanktonic decapods dominate in coastal and some oceanic areas due to the offshore transport of coastal organisms along the ARP retroflection, and (3) the ARP is clearly responsible for the observed differences in community structure between the three transects. Furthermore, this study highlights the importance of coastal and shelf environments as main sources of planktonic decapods for pelagic ecosystems in the tropical Atlantic during the period of strong North Brazil Current retroflection.
Assuncao R, Silva AC, Roy A, et al., 2020, 3D characterisation of the thermohaline structure in the southwestern tropical Atlantic derived from functional data analysis of in situ profiles, PROGRESS IN OCEANOGRAPHY, Vol: 187, ISSN: 0079-6611
Araujo MB, Mestre F, Naimi B, 2020, Ecological and epidemiological models are both useful for SARS-CoV-2, NATURE ECOLOGY & EVOLUTION, Vol: 4, Pages: 1153-1154, ISSN: 2397-334X
Foltz GR, Hummels R, Dengler M, et al., 2020, Vertical Turbulent Cooling of the Mixed Layer in the Atlantic ITCZ and Trade Wind Regions, Journal of Geophysical Research: Oceans, Vol: 125, ISSN: 2169-9275
©2020. American Geophysical Union. All Rights Reserved. The causes of the seasonal cycle of vertical turbulent cooling at the base of the mixed layer are assessed using observations from moored buoys in the tropical Atlantic Intertropical Convergence Zone (ITCZ) (4°N, 23°W) and trade wind (15°N, 38°W) regions together with mixing parameterizations and a one-dimensional model. At 4°N the parameterized turbulent cooling rates during 2017–2018 and 2019 agree with indirect estimates from the climatological mooring heat budget residual: both show mean cooling of 25–30 W m (Formula presented.) during November–July, when winds are weakest and the mixed layer is thinnest, and 0–10 W m (Formula presented.) during August–October. Mixing during November–July is driven by variability on multiple time scales, including subdiurnal, near-inertial, and intraseasonal. Shear associated with tropical instability waves (TIWs) is found to generate mixing and monthly mean cooling of 15–30 W m (Formula presented.) during May–July in 2017 and 2019. At 15°N the seasonal cycle of turbulent cooling is out of phase compared to 4°N, with largest cooling of up to 60 W m (Formula presented.) during boreal fall. However, the relationships between wind speed, mixed layer depth, and turbulent mixing are similar: weaker mean winds and a thinner mixed layer in the fall are associated with stronger mixing and turbulent cooling of SST. These results emphasize the importance of seasonal modulations of mixed layer depth at both locations and shear from TIWs at 4°N.
Herrando-Perez S, Monasterio C, Beukema W, et al., 2020, Heat tolerance is more variable than cold tolerance across species of Iberian lizards after controlling for intraspecific variation, FUNCTIONAL ECOLOGY, Vol: 34, Pages: 631-645, ISSN: 0269-8463
Mendoza M, Araujo MB, 2019, Climate shapes mammal community trophic structures and humans simplify them, NATURE COMMUNICATIONS, Vol: 10, ISSN: 2041-1723
Ribeiro J, Reino L, Schindler S, et al., 2019, Trends in legal and illegal trade of wild birds: a global assessment based on expert knowledge, BIODIVERSITY AND CONSERVATION, Vol: 28, Pages: 3343-3369, ISSN: 0960-3115
Ortega JCG, Machado N, Felizola Diniz-Filho JA, et al., 2019, Meta-analyzing the likely cross-species responses to climate change, ECOLOGY AND EVOLUTION, Vol: 9, Pages: 11136-11144, ISSN: 2045-7758
Garcia-Callejas D, Molowny-Horas R, Araujo MB, et al., 2019, Spatial trophic cascades in communities connected by dispersal and foraging, ECOLOGY, Vol: 100, ISSN: 0012-9658
Norberg A, Abrego N, Blanchet FG, et al., 2019, A comprehensive evaluation of predictive performance of 33 species distribution models at species and community levels, ECOLOGICAL MONOGRAPHS, Vol: 89, ISSN: 0012-9615
Araujo M, Ometto J, Rodrigues-Filho S, et al., 2019, The socio-ecological Nexus+ approach used by the Brazilian Research Network on Global Climate Change, Current Opinion in Environmental Sustainability, Vol: 39, Pages: 62-70, ISSN: 1877-3435
© 2019 The Authors The Brazilian Research Network on Global Climate Change (Rede CLIMA) is an interdisciplinary network composed of 16 research groups, which interact in different levels and programs. This work aims at building climate change cause–effect research from a ‘Nexus+’ perspective, considering the added value of flexibility and adaptability of the concept. The article draws on the Nexus literature alongside a case study in São Francisco River Basin, Northeast Brazil. An additional pillar to the Nexus approach is proposed here, the socio-ecological security, which can be defined as a political-territorial dimension of coupled social and ecological systems. A collaborative research-practice frame was applied to the study region, a hotspot of climate vulnerability in Brazil. Our results highlight the need for this fourth component to address socio-ecological sustainability into context.
Araujo MB, Svenning J-C, Tuomisto H, 2019, Ecography's flip to a pay-to-publish model, ECOGRAPHY, Vol: 42, Pages: 1456-1457, ISSN: 0906-7590
Hounsou-Gbo GA, Servain J, Araujo M, et al., 2019, SST Indexes in the Tropical South Atlantic for Forecasting Rainy Seasons in Northeast Brazil, ATMOSPHERE, Vol: 10, ISSN: 2073-4433
Orselli IBM, Goyet C, Kerr R, et al., 2019, The effect of Agulhas eddies on absorption and transport of anthropogenic carbon in the South Atlantic Ocean, Climate, Vol: 7
© 2019 by the authors. The South Atlantic Ocean is currently undergoing significant alterations due to climate change. This region is important to the global carbon cycle, but marine carbon data are scarce in this basin. Additionally, this region is influenced by Agulhas eddies. However, their effects on ocean biogeochemistry are not yet fully understood. Thus, we aimed to model the carbonate parameters in this region and investigate the anthropogenic carbon (Cant) content in 13 eddies shed by the Agulhas retroflection. We used in situ data from the CLIVAR/WOCE/A10 section to elaborate total dissolved inorganic carbon (CT) and total alkalinity (AT) models and reconstruct those parameters using in situ data from two other Brazilian initiatives. Furthermore, we applied the Tracer combining Oxygen, inorganic Carbon, and total Alkalinity (TrOCA) method to calculate the Cant, focusing on the 13 identified Agulhas eddies. The CT and AT models presented root mean square errors less than 1.66 and 2.19 μmol kg-1, indicating Global Ocean Acidification Observing Network climate precision. The Cant content in the Agulhas eddies was 23% higher than that at the same depths of the surrounding waters. We observed that Agulhas eddies can play a role in the faster acidification of the South Atlantic CentralWater.
Noriega C, Araujo M, Flores-Montes M, et al., 2019, Trophic dynamics (Dissolved Inorganic Nitrogen-DIN and Dissolved Inorganic Phosphorus-DIP) in tropical urban estuarine systems during periods of high and low river discharge rates., An Acad Bras Cienc, Vol: 91
This paper focused on the use of the biogeochemical LOICZ (Land Ocean Interactions in the Coastal Zone) to investigate the dynamics of DIN and DIP nutrients among three highly urbanized tropical estuaries (Barra das Jangadas (BJ), Recife (RE) and Timbó (TB)), located in the northeastern region of Brazil. The input data were obtained through in situ measurements (2007) and governmental agency databases (2001-2007). The balances of the non-conservative elements showed that the RE and TB systems alternated between sources and sinks during the observation periods (0.2-0.8 mmoles DIP m-2 d-1 and 0.1-10 mmoles DIN m-2 d-1). The metabolism rates in the systems indicated that the BJ system was autotrophic during the two observation periods (10-26 mmoles C m-2 d-1), while the RE system was heterotrophic (9-12 mmoles C m-2 d-1). The river discharge rates observed during the period 2001-2007 showed averages ranging from 9.4±3.8 to 18.4±7.7 m3s-1. Measurements of the trophic status in the RE system during 2007 characterized the system as eutrophic, thereby demonstrating high levels of chlorophyll-a and inorganic nutrients. The applications of balance sheets modeling proved to be very useful toward understanding the dynamics of estuarine systems dominated by large urban centers.
Kanagaraj R, Araujo MB, Barman R, et al., 2019, Predicting range shifts of Asian elephants under global change, DIVERSITY AND DISTRIBUTIONS, Vol: 25, Pages: 822-838, ISSN: 1366-9516
Bourles B, Araujo M, McPhaden MJ, et al., 2019, PIRATA: A Sustained Observing System for Tropical Atlantic Climate Research and Forecasting, EARTH AND SPACE SCIENCE, Vol: 6, Pages: 577-616
Varona HL, Veleda D, Silva M, et al., 2019, Amazon River plume influence on Western Tropical Atlantic dynamic variability, Dynamics of Atmospheres and Oceans, Vol: 85, Pages: 1-15, ISSN: 0377-0265
© 2018 Elsevier B.V. This study focuses on analysing the potential impact of the Amazon and Pará Rivers on the salinity, temperature and hydrodynamics of the Western Tropical North Atlantic (WTNA) region between 60.5°–24 °W and 5 °S–16 °N. The Regional Ocean Model System (ROMS) was used to simulate ocean circulation with 0.25° horizontal resolution and 32 vertical levels. Two numerical experiments were performed considering river discharge and river input. Temperature and salinity distributions obtained numerically were compared with Simple Ocean Data Assimilation (SODA) and in situ observations from the Prediction Research Moored Array in the Tropical Atlantic (PIRATA) buoys located at 38 °W8 °N and 38 °W12 °N. Surface currents were compared with Surface Currents from Diagnostic model (SCUD). Once we verified that model results agreed with observations, scenarios with and without river discharges were compared. The difference between both simulations in the Sea Surface Temperature distribution was smaller than 2 °C, whereas the Sea Surface Salinity (SSS) changed by approximately 8 psu in the plume area close to the coast from August to December and reaching SSS differences of approximately 4 psu in the region of the North Equatorial Counter Current (NECC). The surface current velocities are stronger in the experiment with river discharge, mainly in the NECC area from September to December and close to the coast in June to August. The results show that river discharges also cause a phase shift in the zonal currents, anticipating the retroflection of the North Brazil Current by two months and enhancing eastward NECC transport, which is in agreement with observations. The Mixed Layer Depth and Isothermal Layer Depth in the presence of river discharge is 20–50 m shallower over the entire extension of the Amazon plume compared with the situation without continental inflows. As a consequence, stronger
Vicente JR, Kueffer C, Richardson DM, et al., 2019, Different environmental drivers of alien tree invasion affect different life-stages and operate at different spatial scales, FOREST ECOLOGY AND MANAGEMENT, Vol: 433, Pages: 263-275, ISSN: 0378-1127
Herrando-Perez S, Ferri-Yanez F, Monasterio C, et al., 2019, Intraspecific variation in lizard heat tolerance alters estimates of climate impact, JOURNAL OF ANIMAL ECOLOGY, Vol: 88, Pages: 247-257, ISSN: 0021-8790
Araujo MB, Anderson RP, Marcia Barbosa A, et al., 2019, Standards for distribution models in biodiversity assessments, SCIENCE ADVANCES, Vol: 5, ISSN: 2375-2548
Orselli IBM, Kerr R, Azevedo JLLD, et al., 2019, The sea-air CO<inf>2</inf> net fluxes in the South Atlantic Ocean and the role played by Agulhas eddies, Progress in Oceanography, Vol: 170, Pages: 40-52, ISSN: 0079-6611
© 2018 The South Atlantic Ocean is vitally important to the global overturning circulation, which is influenced by heat, salt and other properties carried by Agulhas eddies. However, this influence is not yet fully understood, mainly in the context of the biogeochemistry changes on the CO2 system. This study uses in situ data obtained during the Following Ocean Rings in the South Atlantic cruise, which occurred between Cape Town, South Africa and Arraial do Cabo, Brazil in July 2015 when six eddies and the surrounding waters were sampled. The seawater and atmospheric CO2 molar fraction, surface temperature and salinity were continuously measured to calculate the oceanic and atmospheric CO2 partial pressures (pCO2sw and pCO2atm, respectively). This study investigated the role played by the Agulhas eddies in the sea-air CO2 net flux (FCO2) and modeled the seawater CO2 as a function of environmental parameters. The mean pCO2sw and pCO2atm for the entire region were 351.5 and 390.6 μatm, respectively. The mean difference (ΔpCO2) was −39.1 μatm. The CO2 uptake was dominated by temperature (r = 0.88) during the period analyzed. The mean FCO2 was −3.76 and −3.62 mmol m−2 d−1 using two different KT-models. We show that an Agulhas eddy can contribute to an ocean uptake of −3.16 kg CO2 d−1, leading to the capture of approximately 2.52 t CO2 lifetime−1. Thus, providing evidence that the Agulhas eddies propagation can likely play a key role on the rapid seawater acidification of the South Atlantic Central Water. A multiple linear regression model was developed that could reliably reconstruct the cruise survey with better results than previously published.
Boavida-Portugal J, Rosa R, Calado R, et al., 2018, Climate change impacts on the distribution of coastal lobsters, MARINE BIOLOGY, Vol: 165, ISSN: 0025-3162
García-Callejas D, Molowny-Horas R, Araújo MB, et al., 2018, Spatial trophic cascades in communities connected by dispersal and foraging
<jats:title>Abstract</jats:title><jats:p>Pairwise interactions between species have indirect consequences that reverberate throughout the whole ecosystem. In particular, interaction effects may propagate in a spatial dimension, to localities connected by organismal movement. Here we study the propagation of interactions with a spatially explicit metacommunity model, where local sites are connected by dispersal, foraging, or by both types of movement. We show that direct and net effects of pairwise interactions may differ in sign when foraging across localities is prevalent. Further, the effect of a species over another in the local community does not necessarily correspond to its effect at the metacommunity scale; this correspondence is again mediated by the type of movement across localities. Networks of net effects are fully connected, indicating that every species in the metacommunity has a non-zero influence on every other species. Lastly, the magnitude of net effects between any two species strongly decays with the distance between them. These theoretical results strengthen the importance of considering indirect effects across species at both the local and regional scale, point to the differences between types of movement across locations, and thus open novel avenues for the study of interaction effects in spatially explicit settings.</jats:p>
Pereira CL, Bastos Araujo M, Graca Matias M, 2018, Interplay between productivity and regional species pool determines community assembly in aquatic microcosms, AQUATIC SCIENCES, Vol: 80, ISSN: 1015-1621
Garcia-Callejas D, Molowny-Horas R, Araujo MB, 2018, The effect of multiple biotic interaction types on species persistence, ECOLOGY, Vol: 99, Pages: 2327-2337, ISSN: 0012-9658
Nogueira Neto A, Giordani H, Caniaux G, et al., 2018, Seasonal and Interannual Mixed-Layer Heat Budget Variability in the Western Tropical Atlantic From Argo Floats (2007-2012), JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, Vol: 123, Pages: 5298-5322, ISSN: 2169-9275
Reino L, Trivino M, Beja P, et al., 2018, Modelling landscape constraints on farmland bird species range shifts under climate change, SCIENCE OF THE TOTAL ENVIRONMENT, Vol: 625, Pages: 1596-1605, ISSN: 0048-9697
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