Trophic model of a lightly exploited cod-dominated ecosystem

Pedersen, Torstein; Nilsen, Marianne; Nilssen, Einar M.; Berg, Erik; Reigstad, Marit

doi:10.1016/j.ecolmodel.2007.12.012

Cited by 25 publications

(28 citation statements)

References 56 publications

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“…Each of the models contain 17 fish groups, and fish were sampled using several gears and methods (Table S7). The biomasses of most small fish groups (< 35 cm in length), except for herring, and cottids in some subareas, were calculated from the consumption of the other For the large fish groups ("Large cod", "Large saithe", "Large haddock", "Other large flatfishes" that were ≥ 35 cm in length), except for the "Other large demersal fish" group, biomass values were calculated from catch in kg WW per 20 min haul time, using the same catchability coefficient (adjusted for trawl haul time) as for Sørfjord (N 69° 35', E 19° 45') , northern Norway (Pedersen et al 2008). The resulting biomasses in WW units were then converted to C using a C/WW factor of 0.12.…”

Section: Fish Groupsmentioning

confidence: 99%

“…The value for annual mortality (Z) of small cod were set equal to the P/B of 1.2 year -1 used in the Sørfjord model (Pedersen et al 2008), based on estimation of mortality rates in coastal cod (Pedersen and Pope, 2003a, b).…”

Section: Fish Groupsmentioning

confidence: 99%

“…The Q/B value of large cod was set equal to the value (3.0 year -1 ) used in the Sørfjord model (Pedersen et al 2008), and Q/B was calculated as 8.53 year -1 for small cod by the multistanza procedure (Table S8).…”

Section: Fish Groupsmentioning

confidence: 99%

“…The value of P/B was set equal to that for small cod (1.2 year -1 ). The value of Q/B was set to 6.0 year -1 and is equal to that used for small cod in the Sørfjord model (Pedersen et al 2008).…”

Section: Group Namementioning

confidence: 99%

See 3 more Smart Citations

Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord

Pedersen¹,

Fuhrmann²,

Lindstrøm³

et al. 2018

Mar. Ecol. Prog. Ser.

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Section: Fish Groupsmentioning

confidence: 99%

Section: Fish Groupsmentioning

confidence: 99%

Section: Fish Groupsmentioning

confidence: 99%

Section: Group Namementioning

confidence: 99%

See 2 more Smart Citations

Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord

Pedersen¹,

Fuhrmann²,

Lindstrøm³

et al. 2018

Mar. Ecol. Prog. Ser.

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“…This concern is being included in emerging end-to-end approaches that amalgamate the food web's different trophic levels next to physical drivers to investigate the effect of environmental perturbations on marine ecosystems (e.g. Cury et al 2008, Pedersen et al 2008. Although relationships between lower and higher trophic levels have been established for some time, and summarised in the top down versus bottom up paradigm, it is unclear how the structure of the planktonic community (microbial versus herbivorous) determines the production rate of top predators in natural ecosystems.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

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

Laender¹,

Oevelen²,

Soetaert³

et al. 2010

Mar. Ecol. Prog. Ser.

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We compared carbon budgets between a herbivore-dominated and a microbial loopdominated 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 (~5 × 10 -4 ) and 2 times higher in summer (5 × 10 -2 ) than in spring for copepod production. KEY WORDS: Food web · Microbial loop · Protozoa · Copepods · Gadus morhua Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 398: [93][94][95][96][97][98][99][100][101][102][103][104][105][106][107] 2010 (PAL-LTER) Program (Ross et al. 1996). Apart from abiotic quantities (e.g. nutrient levels), sampling campaigns typically include measurements of primary and bacterial (secondary) production and of standing stocks of the main phytoplankton species, bacteria and mesozooplankton. Because of the focus on the microbial components of the pelagic food web, mesozooplankton are often the highest trophic level considered. Relationships between (bacterial and/or primary) production and consumption (by [proto]zooplankton) tend to be estimated by grazing experiments (as in Vargas et al. 2007) or by numerical modelling (Fasham et al. 1999).Whereas the microbial components of the pelagic food web play a crucial role in biogeochemical cycles (Sabine et al. 2004), they also provide the necessary resources for higher trophic levels such as fish, marine mammals and humans. The differences between phytoplankton food webs and microbial food webs in terms of the efficiency of elemental cycling may thus lead to differences in terms of production rates of higher trophic levels. This concern is being included in emerging end-to-end approaches that amalgamate the food web's different trophic levels next to physical drivers to investigate the effect of environmental perturbations on marine ecosystems (e.g. Cury et al. 2008, Pedersen et al. 2008. Although relationships between lower and h...

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Ecological habitat quality assessment of a tropical estuary using macrobenthic functional characteristics and biotic indices

Rehitha

Vineetha

Madhu

2022

Environ Sci Pollut Res

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Trophic model of a lightly exploited cod-dominated ecosystem

Cited by 25 publications

References 56 publications

Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord

Effects of the invasive red king crab on food web structure and ecosystem properties in an Atlantic fjord

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

Ecological habitat quality assessment of a tropical estuary using macrobenthic functional characteristics and biotic indices

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