Changes with time after capture in the metabolic activity of the carnivorous copepod Euchaeta norvegica Boeck

Skjoldal, Hein Rune; Bmstedt, Ulf; Klinken, Jette; Laing, A.

doi:10.1016/s0022-0981(84)80001-5

Cited by 28 publications

(10 citation statements)

References 42 publications

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“…There have been a series of zooplankton studies designed to determine the effects of holding animals in the laboratory on the R:ETS ratio (Bbmstedt 1980, Ikeda & Skjoldal 1980, Skjoldal et al 1984. ETS activity and respiration decreased during the holding period in each of these studies, but after a few days the R:ETS ratios were essentially the same as those found immediately after capture, regardless of whether the animals were fed or starved.…”

Section: Discussionmentioning

confidence: 99%

Electron transport system (ETS) activity as a measure of benthic macrofaunal metabolism

Cammen¹,

Corwin²,

Christensen³

1990

Mar. Ecol. Prog. Ser.

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The accurate determination of respiration rates is critical to any study of energy flow through marine ecosystems, and in energy budgets of individual marine invertebrates, respiration generally accounts for the major portion of the organic matter ingested. However, there are limitations to current methods for measuring respiration in macrobenthic invertebrates as they are generally applied: measurements are made in the laboratory, not in the field; they are usually carried out in clean sediment or in no sediment at all; and the animals typically are starved during the experiments. This study reports the first application of electron transport system (ETS) activity to estimate in situ rates of oxygen utilization in macrobenthic invertebrates. Measurements of ETS activity and oxygen uptake (R) were made on 2 intertidal species, the polychaete Nereis virens and the amphipodCorophium volutator, under natural conditions and during starvation. ETS activity was related to body size in both species in a manner typical for a metabolic function (ETS = a wP). R:ETS ratios were 0.09 for N. wrens and 0.42 for C. volutator (cf. a literature value of 0.49 for zooplankton) The lower ratio for the former may result from a more sedentary life style or the importance of anaerobic pathways to their overall energetics. The general trend of the starvation experiments for both species was that oxygen uptake declined over 10 to 12 d, but ETS activity remained relatively constant. C. volutator ETS activity was lower in early spring and consistently higher from early summer through fall while N. virens had its highest activity in the early spring and a lower but consistent level of activity in summer and fall; the changes may have been related to the abundance of food resources or to reproductive activity. ETS activity is potentially useful as an estimator of long-term variability in metabolic activity of marine macrofauna.

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Section: Discussionmentioning

confidence: 99%

Electron transport system (ETS) activity as a measure of benthic macrofaunal metabolism

Cammen¹,

Corwin²,

Christensen³

1990

Mar. Ecol. Prog. Ser.

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“…Several studies show decreasing excretion rates with time after capture (Ikeda 1977;LeBorgne 1979;Ikeda and Skjoldal 1980;Hawkins and Keizer 1982). The stress of capture has not been regarded as the main underlying factor (Ikeda and Skjoldal 1980;Skjoldal et al 1984), but Hawkins and Keizer (1982) suggested that the very rapid decrease in ammonium excretion observed early in experiments on C'orophium volututor was so caused.…”

Section: Discussionmentioning

confidence: 99%

Seasonal excretion rates of macrozooplankton from the Swedish west coast

Båmstedt¹

1985

Limnology & Oceanography

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Weight-specific excretion rates of ammonium, urea, inorganic phosphate, and total dissolved phosphorus by 19 species of zooplankton were measured during March-October 198 1. Excretion rates of two copepods Calanus finmarchicus and Metridia longa showed similar trends during spring and summer, but diverged in autumn when C. finmarchicus had much lower rates. Excretion rates of most species were highest in spring and relatively low during summer.The high rates of excretion in spring corresponded with the spring phytoplankton bloom, but later blooms did not affect the excretion rates of the zooplankton. The average excretion rates varied considerably between species; ammonium from 3.2 to 68.1, urea from 0.9 to 6.3, inorganic phosphate from 0.3 to 8.2, and organic phosphorus from 0 to 3.5 nmol excreted per mg of body protein per hour. The average atomic N:P ratio ranged between 2.4 and 46.3, but was ~20 for all species except Sagitta elegans. Estimation of the regenerative importance of nitrogen and phosphorus from macrozooplankton excretion indicated that between 4 and 50% of the phytoplankton nitrogen demands could be fulfilled, with the highest percentage demand being met during autumn. For phosphorus the range was 14-102% of the phytoplankton requirements.

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“…This seems to be common in zooplankton with metabolic (i.e. respiration and excretion) rates being high in freshly-caught specimens and decreasing rapidly with time under laboratory conditions (Mayzaud 1976, Le Borgne 1979, Ikeda & Sk- joldal 1980, Skjoldal et al 1984, Fernández-Urruzola et al 2011. Two possible explanations can be offered for the phenomenon: (1) higher rates for freshly caught specimens are due to the increased activity during sampling, and (2) lower rates after prolonged laboratory maintenance of specimens are due to laboratory effects, such as depletion of the food source.…”

Section: Nhmentioning

confidence: 99%

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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Abstract:The role of the heterotrophic dinoflagellate Noctiluca scintillans in affecting the nutrient-environment and aquatic ecosystem was investigated in the neritic area of Sagami Bay, Kanagawa, Japan, from January 2002 to December 2006, based on abundance, intracellular nutrient content, excretion rate and response of phytoplankton (diatoms) to enrichment of nutrients extracted from N. scintillans cells. Seasonal variations in abundance and vertical distribution of N. scintillans were significantly related to the physical structure of the water column, water temperature, chlorophyll a and primary productivity. Intracellular nutrient contents, except for Si(OH) 4 -Si, revealed clear seasonal fluctuations, which were significantly correlated to cell size variations. Thalassiosira rotula increased to higher cell abundances at higher concentrations of nutrients, which were extracted from N. scintillans cells. NH 4 + -N and PO 4 3--P excretion rates were much higher during the first 1-3 h, and decreased rapidly with time. Daily NH 4 + -N and PO 4 3--P supply by N. scintillans excretion was estimated to be on average 34.8% and 55.3%, especially 50.6-85.4% and 80.5-135.8% in April-July (monthly mean), of the daily N and P requirement for primary production, respectively. The large amounts of nutrients regenerated and released by N. scintillans excretion can increase the N and P concentrations in ambient seawater, especially in the upper layer in spring-summer, and consequently affect phytoplankton (diatom) abundance. These may exacerbate eutrophication in these waters by a mutually supportive relationship between phytoplankton and N. scintillans: bottom-up control (phytoplankton-N. scintillans) and nutrient supply by N. scintillans to phytoplankton through excretion.

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Changes with time after capture in the metabolic activity of the carnivorous copepod Euchaeta norvegica Boeck

Cited by 28 publications

References 42 publications

Electron transport system (ETS) activity as a measure of benthic macrofaunal metabolism

Electron transport system (ETS) activity as a measure of benthic macrofaunal metabolism

Seasonal excretion rates of macrozooplankton from the Swedish west coast

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

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