Climate Indicators for a Watershed in the Eastern Amazon

Tavares, Alexandra Lima; Carmo, Alexandre Melo Casseb do; Júnior, Renato Oliveira da Silva; Souza‐Filho, Pedro Walfir M.; Silva, Marcio Sousa da; Ferreira, Douglas Batista da Silva; Júnior, Wilson da Rocha Nascimento; Dall’Agnol, Roberto

doi:10.5380/abclima.v23i0.61160

Cited by 14 publications

(7 citation statements)

References 25 publications

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“…The authors provided a ground‐based gridded meteorological data set (0.25° × 0.25°) generated by interpolation of the raw data from rain gauges and weather stations in Brazil of different sources from 1980 to 2015 (precipitation) or 2017 (other meteorological data). We used the data of the meteorological station of Marabá (latitude 5°21′S; longitude 49°07′W; elevation 95 m; available at http://www.inmet.gov.br/projetos/rede/pesquisa/) to complete the series from 1973 to 2017, since it shows a good agreement with the data obtained from Xavier et al (; Tavares et al, ) as it is the closest meteorological station to the Itacaiúnas watershed. For example, the correlation coefficient between monthly precipitation was 0.91.…”

Section: Methodsmentioning

confidence: 99%

Opposite Effects of Climate and Land Use Changes on the Annual Water Balance in the Amazon Arc of Deforestation

Cavalcante

Pontes

Souza-Filho

et al. 2019

Water Resources Research

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The hydrological effects of forest cover loss are difficult to discern in the case of large‐scale basins with gradual changes and difficult to isolate when climate variability is also present. In the present study, we evaluated the effects of climate variability and human activity on the annual streamflow in a basin in the Amazon arc of deforestation. We statistically analyzed the components of the annual water balance and monthly streamflow and used the currently used Tomer‐Schilling, elasticity, and decomposition of Budyko‐type curve methods to separate climate‐induced changes and anthropogenic effects. Annual series of the monthly maximum and minimum streamflow, total streamflow, and total reference evapotranspiration presented statistically significant increasing trends. No significant trend was observed for precipitation. The greatest change in the average annual runoff coefficient was observed between the first (1973–1984) and second (1985–1994) analyzed periods. Even with the continuous reduction in the forested area, the third (1994–2004) and fourth analyzed periods (2003–2016) showed only relatively small changes, most likely due to the intensity of slash‐and‐burn activities and vegetation regrowth. The methods showed that deforestation was the primary cause of the streamflow changes, but with different intensities, and a small recuperation was observed in the last analyzed period. On average, the annual water yield would increase between 26% and 58% after the first time interval without the opposite effect of climate variability, which must be considered in basin management. Future research should focus on analyzing the water storage and the dependence of the precipitation‐runoff relationship from the climate.

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Section: Methodsmentioning

confidence: 99%

Opposite Effects of Climate and Land Use Changes on the Annual Water Balance in the Amazon Arc of Deforestation

Cavalcante

Pontes

Souza-Filho

et al. 2019

Water Resources Research

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“…The total annual rainfall of the Carajás region may vary between 1,545 mm and 1,863 mm during the rainy season, with the dry season amounting to values between 159 mm and 321 mm (Silva Júnior et al 2017). The mean temperature is 27.2°C, with a minimum annual temperature of 26.6°C in January and a maximum annual temperature of 28.1°C in September (Tavares et al 2018).…”

Section: Study Areamentioning

confidence: 99%

Foraging preferences of the native stingless bee Melipona seminigra pernigra (Apidae: Meliponini) in campo rupestre on canga of Serra dos Carajás, southeastern Amazonia

et al. 2021

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Honey pollen samples of Melipona seminigra pernigraMoure & Kerr 1950 sampled between 2017 and 2019 from experimental apiaries installed in campo rupestre on canga (CRC) vegetation of the Serra dos Carajás aimed to evaluated seasonal floral availability of undisturbed and mining-influenced areas. Around one hundred pollen types were identified mainly belonging to Fabaceae, Myrtaceae and Euphorbiaceae (31, 6 and 5 species, respectively). Mining area presented the highest pollen richness, almost twice those identified in the undisturbed areas. 80% of the pollen types are rare with concentrations ≤ 2,000 pollen grains/10 g, while the remaining were the most abundant, frequent and the primary bee sources. These latter correspond mostly to native plants species such as Tapirira guianensis Aubl., Protium spp., Aparisthmium cordatum (A.Juss.) Baill., Mimosa acutistipula var. ferrea Barneby, Periandra mediterranea (Vell.) Taub., Miconia spp., Pleroma carajasense K.Rocha, Myrcia splendens (Sw.) DC., Serjania spp. and Solanum crinitum Lam. All pollen types were identified during both seasons, but higher concentration values are related to the dry period (June-September). The statistical analysis of the pollen data indicated that there was no significant difference between undisturbed and mining-influenced areas, since primary bee sources of this study are widespread used in revegetation of mined areas.

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“…The rainfall regime in the dry season is influenced by frontal systems, which are responsible for the convective activity over eastern Amazonia (Souza et al, 2017). Specifically, in the region of the Itacaiúnas River Basin, the mean recorded temperature is 27.2°C, with a minimum annual temperature of 26.6°C in January and a maximum annual temperature of 28.1°C in September (Tavares et al, 2018).…”

Section: Study Areamentioning

confidence: 99%

Hydroclimate influences on modern pollen rain of upland southeastern Amazonia

et al. 2020

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For accurate interpretations of palaeopalynological data, it is important to understand the influence of the current vegetation composition and characteristics on the formation of the palynological assemblage recorded in artificial or natural pollen traps. Therefore, in this study, modern pollen rain was characterized using artificial pollen traps under different ecological conditions and climatic seasons in Trilha da Mata Lake, Carajás North Ridge, southeastern Amazonia. The collection of pollen rain data comprises the total period from September 2015 to August 2016. There were two periods of low rainfall (September to December 2015 and May to August 2016) and one period of high rainfall (January to April 2016). The first two periods were represented by a predominance of canga vegetation pollen relative to forest pollen. Under dry conditions, the associations among the taxa Aparisthmium/Alchornea, Myrcia and Bellucia dichotoma were considered important for forest ecosystems, while those among Pleroma, Hyptis parkeri, Borreria and Perama carajensis were considered important for canga ecosystems. Under wet conditions, the forests were well represented by Schefflera, Anthurium lindmanianum, Pseudopiptadenia suaveolens and Glycydendron, and the most represented canga vegetation in the pollen rain were Poaceae undif., Miconia, M. acutistipula var. ferrea and Psychotria. Aparisthmium/Alchornea and Poaceae undif. Aparisthmium/Alchornea was related to periods of low water availability, and Poaceae undif. was associated with marshy or flooded environments. Thus, an increase in the influx of Poaceae undif. pollen grains was determined by variations in the extension of flooded areas, indicating an increase in the amount of rainfall and not the opposite case. Thus, future studies on vegetation reconstruction must consider modern pollen assemblages to precisely determine paleoenvironmental and paleoclimate conditions during sediment deposition.

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Climate Indicators for a Watershed in the Eastern Amazon

Cited by 14 publications

References 25 publications

Opposite Effects of Climate and Land Use Changes on the Annual Water Balance in the Amazon Arc of Deforestation

Opposite Effects of Climate and Land Use Changes on the Annual Water Balance in the Amazon Arc of Deforestation

Foraging preferences of the native stingless bee Melipona seminigra pernigra (Apidae: Meliponini) in campo rupestre on canga of Serra dos Carajás, southeastern Amazonia

Hydroclimate influences on modern pollen rain of upland southeastern Amazonia

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