Combined effects of freshwater salinization and leaf traits on litter decomposition

Júnior, Edivan S. Almeida; Martínez, Antonio; Gonçalves, Ana Lúcia; Canhoto, Cristina

doi:10.1007/s10750-020-04348-1

Cited by 19 publications

(6 citation statements)

References 48 publications

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“…It is The copyright holder for this preprint this version posted April 27, 2021. ; https://doi.org/10.1101/2021.04.26.441560 doi: bioRxiv preprint Litter decomposition is an important process in aquatic systems (Graça et al, 2015), playing a major role in the global cycling of carbon and nutrients (Battin et al, 2009;Gessner et al, 1999;Graça et al, 2015). Three main factors control aquatic litter decomposition: litter quality (Jabiol et al, 2019;Neiff et al, 2006); environmental factors such as temperature, nutrient availability, salinity, acidity, and oxygen concentration (Almeida Júnior et al, 2020;Ferreira et al, 2015;Gomes et al, 2018;Griffiths and Tiegs, 2016;Woodward et al, 2012;Young et al, 2008); and decomposer community composition, including macroinvertebrates, fungi, and bacteria (Balibrea et al, 2020;Hieber and Gessner, 2002).…”

Section: Introductionmentioning

confidence: 99%

Testing the Tea Bag Index as a potential indicator for assessing litter decomposition in aquatic ecosystems

Mori

Ono

Sakai

2021

Preprint

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The Tea Bag Index (TBI) approach is a standardized method for assessing litter decomposition in terrestrial ecosystems. This method allows determination of the stabilized portion of the hydrolysable fraction during the decomposition process, and derivation of a decomposition constant (k) using single measurements of the mass-loss ratios of green and rooibos teas. Although this method is being applied to aquatic systems, it has not been validated in these environments, where initial leaching tends to be higher than in terrestrial ecosystems. Here, we first validated a critical assumption of the TBI method that green tea decomposition plateaus during the standard incubation period of 90 days, and then tested the accuracy of a TBI-based asymptote model using a second model obtained from fitting actual decomposition data. Validation data were obtained by incubating tea bags in water samples taken from a stream, a pond, and the ocean in Kumamoto, Japan. We found that green tea decomposition did not plateau during the 90-day period, contradicting a key assumption of the TBI method. Moreover, the TBI-based asymptote models disagreed with actual decomposition data. Subtracting the leachable fraction from the initial tea mass improved the TBI-based model, but discrepancies with the actual decomposition data remained. Thus, we conclude that the TBI approach, which was developed for a terrestrial environment, is not appropriate for aquatic ecosystems. However, the use of tea bags as a standard material in assessments of aquatic litter decomposition remains beneficial.

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Section: Introductionmentioning

confidence: 99%

Testing the Tea Bag Index as a potential indicator for assessing litter decomposition in aquatic ecosystems

Mori

Ono

Sakai

2021

Preprint

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“…However, ecosystem-level responses, including ecosystem functions and services, have been rarely assessed [4,24] (Box S1 in the supplemental information online). Organic matter decomposition is the most studied ecosystem function [66], for which interactive effects of salinization with warming and drought have also been explored, implying an additive decrease in decomposition [67,68]. Less is known about salinity effects on biogeochemical cycles, such as nitrogen processing [69] or the carbon cycle [4].…”

Section: Ecosystem Level Processesmentioning

confidence: 99%

Freshwater salinisation: a research agenda for a saltier world

Cunillera‐Montcusí

Beklioğlu

Cañedo‐Argüelles

et al. 2022

Trends in Ecology & Evolution

148

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“…In the sampling site where dry events occurred, desiccation may have influenced the conditioning process and, consequently, reduced biotic decomposition activity [55,56]. Leaf quality, however, played an important role in the process: Oak leaves, considered as lowquality leaf litter because of high recalcitrance and nutrient content [57], showed higher leaf mass remaining; however, chestnut leaves, which have been shown to decompose more readily [58,59], had very low leaf mass remaining at the end of the study, especially in the perennial sites. In the Revello site, where dry events occurred, leaf type did not have such a major impact, as all decomposition was very low.…”

Section: Leaf Litter Decompositionmentioning

confidence: 99%

Flow Intermittency Affects Leaf Decomposition and Benthic Consumer Communities of Alpine Streams: A Case Study along the Po River

Gruppuso

Doretto

Falasco

et al. 2022

Water

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Streams and rivers are becoming increasingly intermittent in Alpine regions due to the global climate change and related increases of local water abstractions, making it fundamental to investigate the occurrence of supraseasonal drying events and their correlated effects. We aimed to investigate leaf litter decomposition, the C:N ratio of the litter, and changes in associated macroinvertebrate communities in three reaches of the Po River: One upstream, consistently perennial, a perennial mid-reach with high hydrological variability, and an intermittent downstream reach. We placed leaf litter bags of two leaf types—chestnut and oak; both showed comparable decomposition rates, but the remaining litter mass was different and was attributed to the C:N ratio and palatability. Furthermore, (1) in perennial reaches, leaf litter decomposed faster than in the intermittent ones; (2) in intermittent reaches, the C:N ratio showed a decreasing trend in both leaf types, indicating that drying affected the nitrogen consumption, therefore the conditioning phase; (3) associated macroinvertebrate communities were richer and more stable in perennial reaches, where a higher richness and abundance of EPT taxa and shredders was observed. Our results suggest that the variations in the hydrology of mountain streams caused by global climate change could significantly impact on functional processes and biodiversity of benthic communities.

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Combined effects of freshwater salinization and leaf traits on litter decomposition

Cited by 19 publications

References 48 publications

Testing the Tea Bag Index as a potential indicator for assessing litter decomposition in aquatic ecosystems

Testing the Tea Bag Index as a potential indicator for assessing litter decomposition in aquatic ecosystems

Freshwater salinisation: a research agenda for a saltier world

Flow Intermittency Affects Leaf Decomposition and Benthic Consumer Communities of Alpine Streams: A Case Study along the Po River

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