Plant litter dynamics in the forest-stream interface: precipitation is a major control across tropical biomes

Tonin, Alan M.; Gonçalves, José F.; Bambi, Paulino; Couceiro, Sheyla Regina Marques; Feitoza, Lorrane A. M.; Fontana, Lucas Eugenio; Hamada, Neusa; Hepp, Luiz Ubiratan; Lezan-Kowalczuk, Vânia G.; Leite, Gustavo Figueiredo Marques; Lemes-Silva, Aurea L.; Lisboa, Leonardo Kleba; Loureiro, Rafael Chaves; Martins, Renato Tavares; Medeiros, Adriana O.; Morais, Paula B.; Moretto, Yara; Oliveria, Patrícia C. A.; Pereira, Evelyn B.; Ferreira, Lidiane P.; Pérez, Javier Jiménez; Petrucio, Maurício Mello; Reis, Deusiano Florêncio dos; Rezende, Renan de Souza; Roque, Nádia; Santos, Luiz E. P.; Siegloch, Ana Emília; Tonello, Gabriela; Boyero, Luz

doi:10.1038/s41598-017-10576-8

Cited by 121 publications

(92 citation statements)

References 78 publications

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“…Respiration influences on SRP uptake have also been described in North American streams (e.g., Gibson & O’Reilly, ). In our low‐intensity agricultural sites, especially those in Brazil, heterotrophic assimilation associated with leaf litter decomposition is probably an important pathway for microbial phosphorus removal, which in turn may be affected by temperature and precipitation patterns (Tonin et al, ). GPP was not related to SRP retention in our low‐intensity agricultural sites, though this has been reported in the literature (e.g., Rasmussen, Baattrup‐Perdersen, Riis, & Friberg, ; Withers & Jarvie, ).…”

Section: Discussionmentioning

confidence: 99%

Agriculture influences ammonium and soluble reactive phosphorus retention in South American headwater streams

et al. 2019

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Agricultural activities can affect the delivery of nutrients to streams, riparian canopy cover, and the capacity of aquatic systems to process nutrients and sediments. There are few measures of nutrient uptake and metabolism from tropical or subtropical streams in general, and even fewer from tropical regions of South America. We examined ammonium (NH4+) and soluble reactive phosphorus (SRP) retention in streams in Brazil and Argentina. We selected 12 streams with relatively little or extensive agricultural activity and conducted whole‐stream nutrient additions and measurements of gross primary production and ecosystem respiration. We used multiple linear regression to determine potential drivers of nutrient uptake metrics across the streams. Nutrient concentrations and retention differed significantly between land use categories. Both NH4+ and SRP concentrations were higher in the agricultural sites (means of 161 and 495 μg l–1, respectively), whereas metabolic rates were slower and transient storage was smaller. Our analysis indicated that agriculture increased ambient uptake lengths and decreased uptake velocities. The regression models revealed that ambient SRP had a positive effect on NH4+ uptake and vice versa, suggesting strong stoichiometric controls. Drivers for nutrient uptake in streams with low‐intensity agriculture also included canopy cover, temperature, and ecosystem respiration rates. Nutrient assimilation in agricultural sites was influenced by a higher number of variables (gross primary production for SRP, discharge, and transient storage for both nutrients). Our results indicate agricultural activity changes both the magnitude of in‐stream nutrient uptake and the mechanisms that control its variation, with important implications for South American streams under agricultural intensification.

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Section: Discussionmentioning

confidence: 99%

Agriculture influences ammonium and soluble reactive phosphorus retention in South American headwater streams

et al. 2019

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“…, Tonin et al. ) when compared to colder and drier soils outside the equator. By contrast, in tropical lowland first‐order streams of the study area, litter decomposition rates may be decreased by slow water flow (due to the topography of the area; Table ) limiting physical breakdown and, through low oxygen concentrations, also limiting the biological process of microbial breakdown (Wagener et al.…”

Section: Discussionmentioning

confidence: 99%

Traits or habitat? Disentangling predictors of leaf‐litter decomposition in Amazonian soils and streams

2019

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Quantifying the relative contributions of plant physicochemical traits and environmental conditions to leaf decomposition is essential to increase our understanding of ecosystem processes in forested terrestrial and aquatic habitats. This is particularly crucial in tropical rainforests that display high levels of tree diversity and environmental heterogeneity over relatively small spatial scales. For example, in Amazonia, detritus from hundreds of tree species fuels carbon cycling in watersheds, but much remains to be learned about how species traits interact with environmental conditions to mediate decomposition. We investigated the leaf‐litter decomposition of 17 tree species with contrasting traits in soil and stream habitats in Yasuní National Park, Ecuador. We hypothesized that (1) habitat type would be the major determinant of leaf decomposition (faster in stream than soil systems), (2) species would be ranked similarly in terms of leaf decomposition rates, according to decomposability traits (i.e., litter quality), within each habitat, and (3) the variability of leaf decomposition within habitats would be greater for soil than for stream systems. Contrary to our first hypothesis, we found that leaf‐litter decomposition rates for any given tree species were similar in stream and soil systems. However, we found that the relative importance of litter traits for decomposition such as concentrations of micronutrients (Mn and Cu, in particular) was consistent across habitats. Finally, we found that decomposition was equally highly variable in both terrestrial and aquatic systems. This variability was explained by differences in microhabitat within soils, but appeared to be more stochastic in streams. Overall, we found that plant traits had an overwhelming effect on the decomposition process in the intertwined aquatic and terrestrial matrices of the Yasuní rainforest, with significant effects of microhabitat features. This study sheds light on the fate of the pool of dead organic matter in tropical rainforests and highlights the need for further studies of the mechanisms underlying microhabitat variability.

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“…In addition, we did not record any dried containers (minimum volume = 176.67 mL), which may have reduced the effects of precipitation on Ceratopogonidae (Rangel et al 2017). In addition, in the Amazon region, the higher leaf inputs occur in the dry season (Tonin et al 2017), which may have attenuated the lower water volume in containers in this season.…”

Section: Discussionmentioning

confidence: 99%

Biting midges (Diptera: Ceratopogonidae) from an urban forest fragment in Central Amazon (Brazil): Effects of opening areas on abundance, richness, and composition

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Ferreira-Keppler

Martins

et al. 2017

An. Acad. Bras. Ciênc.

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We assessed the immature stages of Ceratopogonidae (Diptera) in artificial containers in an urban forest fragment in Manaus (Brazil), including their behavioral, biological and ecological information. In addition, we evaluated the effects of deforestation in an open and forested area on Ceratopogonidae communities. Immatures were sampled between August 2012 and July 2014 in artificial containers installed in both habitat types. We collected 685 immatures of seven morpho-species of Bezzia Kieffer, Culicoides Latreille, Dasyhelea Kieffer, Forcipomyia Meigen, and Palpomyia Meigen. In the open area, we recorded higher temperature and electrical conductivity values than in the forested area; however, these variables did not differ between seasons. Water volume was higher in open area and in rainy season, while pH was similar in both areas and seasons. Species richness was higher in forested area, but did not differ between seasons. We did not record differences in abundance between areas or seasons. Community composition differed between areas, but not between seasons. We provide the first records of Culicoides (Hoffmania) insignis Lutz and C. (Haematomyidium) quasiparaensis Clastrier in artificial containers from the state of Amazonas. Our results suggest that the preservation of forested areas in Amazonas is fundamental for the maintenance of the life cycle of some species of Ceratopogonidae.

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Plant litter dynamics in the forest-stream interface: precipitation is a major control across tropical biomes

Cited by 121 publications

References 78 publications

Agriculture influences ammonium and soluble reactive phosphorus retention in South American headwater streams

Agriculture influences ammonium and soluble reactive phosphorus retention in South American headwater streams

Traits or habitat? Disentangling predictors of leaf‐litter decomposition in Amazonian soils and streams

Biting midges (Diptera: Ceratopogonidae) from an urban forest fragment in Central Amazon (Brazil): Effects of opening areas on abundance, richness, and composition

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