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Carbon transfer in herbivore- and microbial loop-dominated pelagic food webs in the southern Barents Sea during spring and summer

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Abstract
We compared carbon budgets between a herbivore - domina led and a microbial loop-dominated food web and examined the implications of food web structure for fish production. We used the southern Barents Sea as a case study and inverse modelling as an analysis method. In spring, when the system was dominated by the herbivorous web, the diet of protozoa consisted of similar amounts of bacteria and phytoplankton. Copepods showed no clear preference for protozoa. Cod Gadus morhua, a predatory fish preying on copepods and on copepod-feeding capelin Mallotus villosus in spring, moderately depended on the microbial loop in spring, as only 20 to 60% of its food passed through the microbial loop. In summer, when the food web was dominated by the microbial loop, protozoa ingested 4 times more bacteria than phytoplankton and protozoa formed 80 to 90%, of the copepod diet. Because of this strong link between the microbial loop and copepods (the young cod's main prey item) young cod (< 3 yr) depended more on the microbial loop than on any other food web compartment, as > 60% of its food passed through the microbial loop in summer. Adult cod (<= 3 yr) relied far less on the microbial loop than young cod as it preyed on strictly herbivorous krill in summer. Food web efficiency for fish production was comparable between seasons (similar to 5 x 10(-4)) and 2 times higher in summer (5 x 10(-2)) than in spring for copepod production.
Keywords
Microbial loop, Food web, Protozoa, Copepods, Gadus morhua, DISSOLVED ORGANIC-CARBON, NORTHEAST ARCTIC COD, MARGINAL ICE-ZONE, GADUS-MORHUA L, POPULATION-DYNAMICS, SEASONAL-VARIATION, ATLANTIC COD, HETEROTROPHIC BACTERIAL, ZOOPLANKTON COMMUNITY, CALANUS-FINMARCHICUS

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Citation

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Chicago
De Laender, Frederik, Dick Van Oevelen, Jack Middelburg, and Karline Soetaert. 2010. “Carbon Transfer in Herbivore- and Microbial Loop-dominated Pelagic Food Webs in the Southern Barents Sea During Spring and Summer.” Marine Ecology-progress Series 398: 93–107.
APA
De Laender, F., Van Oevelen, D., Middelburg, J., & Soetaert, K. (2010). Carbon transfer in herbivore- and microbial loop-dominated pelagic food webs in the southern Barents Sea during spring and summer. MARINE ECOLOGY-PROGRESS SERIES, 398, 93–107.
Vancouver
1.
De Laender F, Van Oevelen D, Middelburg J, Soetaert K. Carbon transfer in herbivore- and microbial loop-dominated pelagic food webs in the southern Barents Sea during spring and summer. MARINE ECOLOGY-PROGRESS SERIES. 2010;398:93–107.
MLA
De Laender, Frederik, Dick Van Oevelen, Jack Middelburg, et al. “Carbon Transfer in Herbivore- and Microbial Loop-dominated Pelagic Food Webs in the Southern Barents Sea During Spring and Summer.” MARINE ECOLOGY-PROGRESS SERIES 398 (2010): 93–107. Print.
@article{1191654,
  abstract     = {We compared carbon budgets between a herbivore - domina led and a microbial loop-dominated food web and examined the implications of food web structure for fish production. We used the southern Barents Sea as a case study and inverse modelling as an analysis method. In spring, when the system was dominated by the herbivorous web, the diet of protozoa consisted of similar amounts of bacteria and phytoplankton. Copepods showed no clear preference for protozoa. Cod Gadus morhua, a predatory fish preying on copepods and on copepod-feeding capelin Mallotus villosus in spring, moderately depended on the microbial loop in spring, as only 20 to 60\% of its food passed through the microbial loop. In summer, when the food web was dominated by the microbial loop, protozoa ingested 4 times more bacteria than phytoplankton and protozoa formed 80 to 90\%, of the copepod diet. Because of this strong link between the microbial loop and copepods (the young cod's main prey item) young cod ({\textlangle} 3 yr) depended more on the microbial loop than on any other food web compartment, as {\textrangle} 60\% of its food passed through the microbial loop in summer. Adult cod ({\textlangle}= 3 yr) relied far less on the microbial loop than young cod as it preyed on strictly herbivorous krill in summer. Food web efficiency for fish production was comparable between seasons (similar to 5 x 10(-4)) and 2 times higher in summer (5 x 10(-2)) than in spring for copepod production.},
  author       = {De Laender, Frederik and Van Oevelen, Dick and Middelburg, Jack and Soetaert, Karline},
  issn         = {0171-8630},
  journal      = {MARINE ECOLOGY-PROGRESS SERIES},
  keyword      = {Microbial loop,Food web,Protozoa,Copepods,Gadus morhua,DISSOLVED ORGANIC-CARBON,NORTHEAST ARCTIC COD,MARGINAL ICE-ZONE,GADUS-MORHUA L,POPULATION-DYNAMICS,SEASONAL-VARIATION,ATLANTIC COD,HETEROTROPHIC BACTERIAL,ZOOPLANKTON COMMUNITY,CALANUS-FINMARCHICUS},
  language     = {eng},
  pages        = {93--107},
  title        = {Carbon transfer in herbivore- and microbial loop-dominated pelagic food webs in the southern Barents Sea during spring and summer},
  url          = {http://dx.doi.org/10.3354/meps08335},
  volume       = {398},
  year         = {2010},
}

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