Food Webs and Carbon Cycling in Humic Lakes

1998 ◽  
pp. 285-315 ◽  
Author(s):  
Dag O. Hessen
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Humic Lakes

Author response for "Forest fire induces short‐term shifts in soil food webs with consequences for carbon cycling"

2020 ◽  
Author(s):  
Konstantin B. Gongalsky ◽  
Andrey S. Zaitsev ◽  
Daniil I. Korobushkin ◽  
Ruslan A. Saifutdinov ◽  
Konstantin O. Butenko ◽  
...  
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Forest Fire ◽  
Author Response ◽  
Short Term ◽  
Soil Food Webs

Forest fire induces short‐term shifts in soil food webs with consequences for carbon cycling

2020 ◽  
Author(s):  
Konstantin B. Gongalsky ◽  
Andrey S. Zaitsev ◽  
Daniil I. Korobushkin ◽  
Ruslan A. Saifutdinov ◽  
Konstantin O. Butenko ◽  
...  
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Forest Fire ◽  
Short Term ◽  
Soil Food Webs

Carbon Cycling in Floodplain Ecosystems: Out-Gassing and Photosynthesis Transmit Soil δ13C Gradient Through Stream Food Webs

Ecosystems ◽  
2011 ◽  
Vol 14 (4) ◽  
pp. 583-597 ◽  
Author(s):  
Duncan P. Gray ◽  
Jon S. Harding ◽  
Bo Elberling ◽  
Travis Horton ◽  
Tim J. Clough ◽  
...  
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Floodplain Ecosystems ◽  
Stream Food Webs

scholarly journals Radiocarbon signature reveals that most springtails depend on carbon from living plants

2021 ◽  
Vol 17 (9) ◽  
pp. 20210353
Author(s):  
Saori Fujii ◽  
Takashi F. Haraguchi ◽  
Ichiro Tayasu
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Feeding Habits ◽  
Significant Negative Correlation ◽  
Trophic Levels ◽  
Soil Microarthropods ◽  
Soil Food Webs ◽  
Animal Feeding ◽  
Taxonomic Groups ◽  
Isotope Analyses

Terrestrial carbon cycling is largely mediated by soil food webs. Identifying the carbon source for soil animals has been desired to distinguish their roles in carbon cycling, but it is challenging for small invertebrates at low trophic levels because of methodological limitations. Here, we combined radiocarbon ( 14 C) analysis with stable isotope analyses ( 13 C and 15 N) to understand feeding habits of soil microarthropods, especially focusing on springtail (Collembola). Most Collembola species exhibited lower Δ 14 C values than litter regardless of their δ 13 C and δ 15 N signatures, indicating their dependence on young carbon. In contrast with general patterns across all taxonomic groups, we found a significant negative correlation between δ 15 N and Δ 14 C values among the edaphic Collembola. This means that the species with higher δ 15 N values depend on C from more recent photosynthate, which suggests that soil-dwelling species generally feed on mycorrhizae to obtain root-derived C. Many predatory taxa exhibited higher Δ 14 C values than Collembola but lower than litter, indicating non-negligible effects of collembolan feeding habits on the soil food web. Our study demonstrated the usefulness of radiocarbon analysis, which can untangle the confounding factors that change collembolan δ 15 N values, clarify animal feeding habits and define the roles of organisms in soil food webs.

Spatial and seasonal patterns of carbon cycling through planktonic food webs of the Arabian Sea determined by inverse analysis

2006 ◽  
Vol 53 (5-7) ◽  
pp. 555-575 ◽  
Author(s):  
Tammi L. Richardson ◽  
George A. Jackson ◽  
Hugh W. Ducklow ◽  
Michael R. Roman
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Inverse Analysis ◽  
Arabian Sea ◽  
Seasonal Patterns ◽  
Planktonic Food

scholarly journals Protistan grazing impacts microbial communities and carbon cycling at deep-sea hydrothermal vents

2021 ◽  
Vol 118 (29) ◽  
pp. e2102674118
Author(s):  
Sarah K. Hu ◽  
Erica L. Herrera ◽  
Amy R. Smith ◽  
Maria G. Pachiadaki ◽  
Virginia P. Edgcomb ◽  
...  
Keyword(s):  
Food Webs ◽  
Carbon Cycling ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Hydrothermal Vents ◽  
Grazing Pressure ◽  
Trophic Levels ◽  
Deep Seawater ◽  
Potential Predator ◽  
Protistan Grazing

Microbial eukaryotes (or protists) in marine ecosystems are a link between primary producers and all higher trophic levels, and the rate at which heterotrophic protistan grazers consume microbial prey is a key mechanism for carbon transport and recycling in microbial food webs. At deep-sea hydrothermal vents, chemosynthetic bacteria and archaea form the base of a food web that functions in the absence of sunlight, but the role of protistan grazers in these highly productive ecosystems is largely unexplored. Here, we pair grazing experiments with a molecular survey to quantify protistan grazing and to characterize the composition of vent-associated protists in low-temperature diffuse venting fluids from Gorda Ridge in the northeast Pacific Ocean. Results reveal protists exert higher predation pressure at vents compared to the surrounding deep seawater environment and may account for consuming 28 to 62% of the daily stock of prokaryotic biomass within discharging hydrothermal vent fluids. The vent-associated protistan community was more species rich relative to the background deep sea, and patterns in the distribution and co-occurrence of vent microbes provide additional insights into potential predator–prey interactions. Ciliates, followed by dinoflagellates, Syndiniales, rhizaria, and stramenopiles, dominated the vent protistan community and included bacterivorous species, species known to host symbionts, and parasites. Our findings provide an estimate of protistan grazing pressure within hydrothermal vent food webs, highlighting the important role that diverse protistan communities play in deep-sea carbon cycling.

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