From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin

Speer, Milton S.; Leslie, Lance M.; MacNamara, Shev; Hartigan, Joshua

doi:10.1038/s41598-021-95531-4

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…Conforme Wu et al (2020) o aumento da precipitação afeta na diversidade dos micro-organismos do solo. Por tanto, nos cenários de mudanças climáticas e havendo cada vez mais eventos extremos (Marengo et al, 2021;Speer et al, 2021), os micro-organismos habitantes do solo adotam medidas de adaptação ao clima para eventuais reduções na disponibilidade de umidade no solo (Brangarí et al, 2020). Contudo, Leizeaga et al, 2020 Rodrigues., J., B., Gomes., D., J., C., Costa., A., C., Fonte: Autores (2021).…”

Section: Micro-organismos X Tempounclassified

Avaliação estatística do crescimento populacional de micro-organismos de solo associado à sazonalidade microclimática em uma floresta tropical úmida

Rodrigues

Gomes

Costa

2022

Rev. Bras. Geog. Fis.

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As condições climáticas modulam a disponibilidade hídrica em florestas tropicais, fator que impacta no comportamento dos micro-organismos do solo. Este estudo tem como objetivo avaliar estatisticamente as interações entre o microclima de uma floresta tropical primária e o crescimento das populações microbianas de solo, sob diferentes condições ambientais. Em conjunto, verificar a existência de diferença na proliferação de micro-organismos de solo com relação a diferentes tipos de terrenos e profundidades, além de quantificar sazonalmente a distribuição populacional de fungos e bactérias. Foi realizado durante um ano em duas áreas experimentais, PPBio (área de floresta densa natural) e ESECAFLOR (área de 1 hectares coberta para simulação de seca prolongada) em Caxiuanã-PA, utilizando a técnica “Pour Plate” de contagem em placas de “Petri” seguindo a metodologia proposta por De-Polli & Guerra. A variabilidade climática corroborou com a análise estatística ao aferir que a bactérias e fungos se desenvolvem independentemente do tipo de solo; e, comportam-se diferentemente em função do tempo, onde percebemos melhor proliferação de bactérias no tempo chuvoso, enquanto que os fungos obtiveram melhor proliferação durante o período seco. Garantindo a confiabilidade na amostra, provou-se que o nível de significância de 0,019 para bactérias e de 0,000 para os fungos, representam abundância de micro-organismos nas primeiras camadas de solo e menores nas últimas camadas de solo.Palavras-chave: Precipitação, Microfauna, Amazônia oriental. Statistical evaluation of population growth of soil microorganisms associated with microclimatic seasonality in a humid tropical forest A B S T R A C TClimatic conditions modulate water availability in tropical forests, a factor that impacts the behavior of soil microorganisms. This study aims to statistically evaluate the interactions between the microclimate of a primary tropical forest and the growth of soil microbial populations under different environmental conditions. Together, verify the existence of differences in the difference of types of soil microorganisms with respect to the relationship of terrains and depths, in addition to the distribution of seasonally quantify population bacteria and fungi. It was carried out for one year in two experimental areas, PPBio (area of dense natural forest) and ESECAFLOR (area of 1 hectares covered for simulation of prolonged drought) in Caxiuanã-PA, using the "Pour Plate" technique of counting plates of " Petri” following the methodology proposed by De-Polli & Guerra. Climatic variability corroborated the statistical analysis by verifying that bacteria and fungi develop independently of the type of soil; and, they behave differently depending on the weather, where we perceive better proliferation of bacteria in the rainy season, while the fungi obtained better proliferation during the dry period. Ensuring the reliability of the sample, it was proved that the significance level of 0.019 for bacteria and 0.000 for fungi, represent an abundance of microorganisms in the first layers of soil and smaller ones in the last layers of soil.Keywords: Rainfall, Microfauna, Eastern Amazon.

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Section: Micro-organismos X Tempounclassified

Avaliação estatística do crescimento populacional de micro-organismos de solo associado à sazonalidade microclimática em uma floresta tropical úmida

Rodrigues

Gomes

Costa

2022

Rev. Bras. Geog. Fis.

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“…Conversely, cool season rainfall in western Tasmania has increased (Figure 2a). Overall, the cool‐season decline has negatively impacted several agricultural regions, including by lowering the river height in the key food production region of the Murray‐Darling Basin (Speer et al, 2021). Southern Australian warm season rainfall trends are generally noisier (Figure 2b).…”

Section: Introduction—rainfall Changesmentioning

confidence: 99%

Can southern Australian rainfall decline be explained? A review of possible drivers

McKay

Boschat

Rudeva

et al. 2023

WIREs Climate Change

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Southern Australia's rainfall is highly variable and influenced by factors across scales from synoptic weather to large-scale circulation and remote climate modes of variability. Anthropogenic climate change and natural variability modulate these factors and their interactions. However, studies often focus on changes in selected parts of the climate system with less emphasis on the system as a whole. As such, it is difficult to gain a complete understanding of how southern Australia's rainfall responds to broad-scale changes in the climate system. We step through the existing literature on long-term changes in synoptic-to-large-scale atmospheric circulation and drivers of climate variability to form a more complete story of rainfall changes across southern Australia. This process reveals that the most robust change is the observed winter decline in rainfall as it is consistent with several changing climatic factors: decreasing rainfall from weather systems, strengthening subtropical ridge, poleward shifts in the Hadley Cell and the Southern Annular Mode, and increasing frequency of positive Indian Ocean Dipole events. In other seasons, particularly summer, changes in atmospheric circulation and drivers may not agree with observed rainfall changes, highlighting gaps in our knowledge of atmospheric dynamics and climate change processes. Future work should focus on research across temporal-and spatial-scales, better understanding of jet interactions, the influence of stratospheric processes on the troposphere, and instances of contrasting trends in drivers and southern Australian rainfall changes.

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“…Climate change in recent decades has impacted the hydrological regime at different time scales and in different watersheds located in many parts of the Earth such as Africa (Coulibaly et al, 2018), America (Lu et al, 2015), Asia (Qiu et al, 2019), Australia (Speer et al, 2021), and Europe (Grusson et al, 2021). Cai et al (2014) and Yun et al (2021) suggested that such climate variations may contribute to the intensification of extreme events such as the El Niño Southern Oscillation (ENSO).…”

Section: Introductionmentioning

confidence: 99%

Flow variability in the Araguaia River Hydrographic Basin influenced by precipitation in extreme years and deforestation

Gomes

Nascimento

Pereira

et al. 2022

Rev. Bras. Ciênc. Ambient.

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The climatic extremes and the dynamics of land use and cover can cause changes in river flow. The objective of this work was to analyze the flow of the Araguaia River under the effects of extreme years associated with the dynamics of land use in the Araguaia Watershed (AW) from 1981 to 2019. The land use and land cover product were based on the MapBiomas Project classification, imported from the Google Earth Engine. The measured rainfall and flow data were obtained from the National Water Agency. In contrast, the estimated rainfall was based on the data Climate Hazards Group InfraRed Precipitation with Stations. The precipitation climatology showed the lowest values (1,464.9–1,720.4 mm) in the south-central sector, and the highest (1,720.4–2,014.6 mm) rainfall amounts were observed in the north sector. However, it was identified in the five pluviometric stations with a high variability of precipitation, with an emphasis on the extreme years. Such wet and dry years were marked by a large difference in water availability. There was an intense reduction of the Amazon and Cerrado biomes by 31,641.8 and 42,618.9 km², respectively, mainly due to the expansion of 18,936.1 km² of agricultural activities and 47,494 km² of pasture. The fluviometric variability showed a decreasing trend, mainly in the past 15 years. Public actions, such as the intensification of environmental policies, monitoring focusing on the most compromised and strategic areas such as the headwaters of the Araguaia River, can minimize the impacts caused by climate extremes and deforestation.

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From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin

Cited by 18 publications

References 28 publications

Avaliação estatística do crescimento populacional de micro-organismos de solo associado à sazonalidade microclimática em uma floresta tropical úmida

Avaliação estatística do crescimento populacional de micro-organismos de solo associado à sazonalidade microclimática em uma floresta tropical úmida

Can southern Australian rainfall decline be explained? A review of possible drivers

Flow variability in the Araguaia River Hydrographic Basin influenced by precipitation in extreme years and deforestation

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