Incorporation and burial of carbon from settling cyanobacterial blooms by deposit‐feeding macrofauna

Karlson, Agnes M. L.; Nascimento, Francisco J. A.; Elmgren, Ragnar

doi:10.4319/lo.2008.53.6.2754

Cited by 31 publications

(28 citation statements)

References 21 publications

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“…This OM had a molar C/N ratio of 5.2, similar to that of Aphanizomenon sp. (C/N=4.9; Karlson et al, 2008). Such C/N ratio was lower than other sources of organic matter used in previous studies (Caffrey et al, 1993;Conley and Johnstone, 1995;Holmer, 1996), which were 7.5, 7.2 and 7.6 for yeast, diatoms and flagellates, respectively.…”

Section: Reconstructed Sediment Characteristicscontrasting

confidence: 50%

Response of sedimentary processes to cyanobacteria loading

2015

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Section: Reconstructed Sediment Characteristicscontrasting

confidence: 50%

Response of sedimentary processes to cyanobacteria loading

2015

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“…We did not include a P. femorata þ M. balthica treatment since this combination is hardly found in nature. Even though earlier studies found no negative effects in benthic infauna that fed on N. spumigena (Karlson et al 2008), we also included treatments corresponding to Ma, Pf, Mb, and Ma þ Pf þ Mb (n ¼ 4) to which no cyanobacterial bloom material was added. These were intended as controls for the cyanobacterial addition, not for the biodiversity effects.…”

Section: Experimental Designmentioning

confidence: 99%

Higher diversity of deposit‐feeding macrofauna enhances phytodetritus processing

Karlson

Nascimento

Näslund

et al. 2010

Ecology

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The link between biodiversity and ecosystem functioning is an important question that remains unresolved, particularly in marine systems, in which cycling of organic matter by benthic organisms is of global significance. Direct observations of specific resource use by each species in single- and multispecies communities, as quantified by stable isotopes, facilitates a mechanistic understanding of the importance of each species for ecosystem functioning. We tested the effects of altered biodiversity (species richness) of deposit-feeding macrofauna on incorporation and burial of phytodetritus in combinations of three species representing natural communities found in the sediments of the species-poor Baltic Sea. The three species, two amphipods and a bivalve, had different rates of incorporation and burial and different needs for carbon (C) and nitrogen (N). The amphipods exhibited clear resource partitioning in sympatry, as a result of vertical separation in the sediment and consequent differential use of food. Communities of several species incorporated more C and N than expected from the respective single-species treatments, due to higher incorporation by surface feeders in multispecies treatments. Community incorporation of N in the most diverse treatment even exceeded N incorporation by a single-species treatment of the best-performing species, showing transgressive over-yielding. This over-yielding was primarily due to positive complementarity in all treatments. Diverse soft bottoms are also likely to be more productive in the long run, as species-specific traits (subsurface feeding) preserve fresh phytodetritus by burying it to depths in the sediment at which the mineralization rate is low. The more diverse sediment communities showed more efficient trophic transfer of phytodetritus, a finding of general significance for understanding biological processes driving the transformation of nutrients and energy in benthic ecosystems.

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“…Decomposed CBB can be an important benthic food source [4] and decomposition products can be assimilated by rooted macrophytes [5]. As CBB undergoes decomposition, both nitrogen and phosphorus containing compounds are released.…”

Section: Introductionmentioning

confidence: 99%

Temperature and Cyanobacterial Bloom Biomass Influence Phosphorous Cycling in Eutrophic Lake Sediments

Chen

Krumholz

et al. 2014

PLoS ONE

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Cyanobacterial blooms frequently occur in freshwater lakes, subsequently, substantial amounts of decaying cyanobacterial bloom biomass (CBB) settles onto the lake sediments where anaerobic mineralization reactions prevail. Coupled Fe/S cycling processes can influence the mobilization of phosphorus (P) in sediments, with high releases often resulting in eutrophication. To better understand eutrophication in Lake Taihu (PRC), we investigated the effects of CBB and temperature on phosphorus cycling in lake sediments. Results indicated that added CBB not only enhanced sedimentary iron reduction, but also resulted in a change from net sulfur oxidation to sulfate reduction, which jointly resulted in a spike of soluble Fe(II) and the formation of FeS/FeS2. Phosphate release was also enhanced with CBB amendment along with increases in reduced sulfur. Further release of phosphate was associated with increases in incubation temperature. In addition, CBB amendment resulted in a shift in P from the Fe-adsorbed P and the relatively unreactive Residual-P pools to the more reactive Al-adsorbed P, Ca-bound P and organic-P pools. Phosphorus cycling rates increased on addition of CBB and were higher at elevated temperatures, resulting in increased phosphorus release from sediments. These findings suggest that settling of CBB into sediments will likely increase the extent of eutrophication in aquatic environments and these processes will be magnified at higher temperatures.

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Incorporation and burial of carbon from settling cyanobacterial blooms by deposit‐feeding macrofauna

Cited by 31 publications

References 21 publications

Response of sedimentary processes to cyanobacteria loading

Response of sedimentary processes to cyanobacteria loading

Higher diversity of deposit‐feeding macrofauna enhances phytodetritus processing

Temperature and Cyanobacterial Bloom Biomass Influence Phosphorous Cycling in Eutrophic Lake Sediments

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