Feeding history can influence physiological responses of copepods: an experimental study comparing different cohorts of Temora longicornis from the Southern North Sea

Niehoff, Barbara; Kreibich, Tobias; Saborowski, Reinhard; Hagen, Wilhelm

doi:10.1016/j.jembe.2015.04.008

Cited by 5 publications

(4 citation statements)

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“…This indicates at least one of two possibilities, though more likely a combination of both. First, that copepods may have been C-limited in the field (a condition previously shown for T. longicornis in the same area and month by Niehoff et al, 2015) and, thus, replenished their FA/energy depots when exposed to a C-rich experimental diet. Anderson et al (2021) calculated that nutrient limitation of marine copepods changes from N-to Climitation at food C:N ratios lower than 7.3-11.5 (depending on food quantity).…”

Section: Effects Of Experimental Diet On the Tfa Content And Profile ...mentioning

confidence: 90%

“…The centric diatom Thalassiosira weissflogii (Grunow) (Fryxell and Hasle, 1977), presently accepted as Conticribra weissflogii (Grunow) (Stachura-Suchoples and Williams, 2009), was used in this feeding experiment. This diatom is a common prey for T. longicornis in nature (Evans, 1981), and is well taken up by the copepod under laboratory conditions (Jońasdottir et al, 2009;Niehoff et al, 2015;Franco-Santos et al, 2018b). Batch cultures of C. weissflogii were started on a daily basis for five consecutive days by diluting a stock solution with fresh f/2 medium (details in Franco-Santos et al, 2018b).…”

Section: Prey Culturementioning

confidence: 99%

“…In the North Sea, this species is abundant and reproduces year-round, and its grazing can have a substantial impact on the phytoplankton standing stock (Maar et al, 2004;Wesche et al, 2007;Gentsch et al, 2009). Like many other small copepods which are typical of highly productive shelf seas, T. longicornis has a limited ability to store energy (lipid) reserves (Evjemo and Olsen, 1997;Kreibich et al, 2008;Niehoff et al, 2015). Studies have shown that, for T. longicornis (a) the FA profile can change within 24h of introduction to a new dietary source (Kreibich et al, 2008;Kreibich et al, 2011), and the response is related to its feeding history (Niehoff et al, 2015); and that (b) egg production rates and hatching success are positively related with the availability of omega-3 (or n-3) FAs (Arendt et al, 2005;Jońasdottir et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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To Regulate or Not to Regulate: Assimilation of Dietary Fatty Acids in the Temperate Copepod Temora longicornis

et al. 2022

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Consumer regulation of lipid composition during assimilation of dietary items is related to their ecology, habitat, and life cycle, and may lead to extra energetic costs associated with the conversion of dietary material into the fatty acids (FAs) necessary to meet metabolic requirements. For example, lipid-rich copepods from temperate and polar latitudes must convert assimilated dietary FAs into wax esters, an efficient type of energy storage which enables them to cope with seasonal food shortages and buoyancy requirements. Lipid-poor copepods, however, tend to not be as constrained by food availability as their lipid-rich counterparts and, thus, should have no need for modifying dietary FAs. Our objective was to test the assumption that Temora longicornis, a proxy species for lipid-poor copepods, does not regulate its lipid composition. Isotopically-enriched (13C) diatoms were fed to copepods during a 5-day laboratory experiment. Compound-specific stable isotope analysis of algae and copepod samples was performed in order to calculate dietary FA assimilation, turnover, and assimilation efficiency into copepod FAs. Approximately 65% of the total dietary lipid carbon (C) assimilated (913 ± 68 ng C ind-1 at the end of the experiment) was recorded as polyunsaturated FAs, with 20 and 15% recorded as saturated and monounsaturated FAs, respectively. As expected, T. longicornis assimilated dietary FAs in an unregulated, non-homeostatic manner, as evidenced by the changes in its FA profile, which became more similar to that of their diet. Copepods assimilated 11% of the total dietary C (or 40% of the dietary lipid C) ingested in the first two days of the experiment. In addition, 34% of their somatic growth (in C) after two days was due to the assimilation of dietary C in FAs. Global warming may lead to increased proportions of smaller copepods in the oceans, and to a lower availability of algae-produced essential FAs. In order for changes in the energy transfer in marine food webs to be better understood, it is important that future investigations assess a broader range of diets as well as lipid-poor zooplankton from oceanographic areas throughout the world’s oceans.

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Section: Effects Of Experimental Diet On the Tfa Content And Profile ...mentioning

confidence: 90%

Section: Prey Culturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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To Regulate or Not to Regulate: Assimilation of Dietary Fatty Acids in the Temperate Copepod Temora longicornis

et al. 2022

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“…Similarly, T. longicornis appeared to be one of the energy-poorest species. This species cannot accumulate extensive energy because of its rapid metabolic and functional responses to food limitation (Niehoff et al, 2015). In experimental conditions, T. longicornis exhibited a rapid loss of lipids compared to P. elongatus (Martynova et al, 2009).…”

Section: Interspecific Variability Of Energy Densitymentioning

confidence: 99%

Variability of energy density among mesozooplankton community: New insights in functional diversity to forage fish

Dessier

Dupuy

Kerric

et al. 2018

Progress in Oceanography

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A year-round study on digestive enzymes in the Arctic copepod Calanus glacialis: implications for its capability to adjust to changing environmental conditions

2016

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43Zooplankton communities in Arctic shelf regions are dominated in terms of biomass by the calanoid copepod 44Calanus glacialis. During the winter months their metabolic rate decrease while they reside at deep water layers. 45In late winter, it migrates to the surface where the spring generation develops. To date, it is not fully understood 46what regulates the activity of the copepods and how it coincides with food availability. We sampled C. glacialis 47 in a high Arctic fjord in monthly intervals for a one year cycle and determined proteinase and lipase/esterase 48 activities in relation to food availability and depth distribution of the copepods. By substrate SDS-PAGE 49(sodium dodecylsulfate polyacrylamide gel electrophoresis), we tackled changes in specific isoforms. We found 50 clear seasonal enzyme activity patterns; activities of individuals in winter were reduced by at least 75 % as 51 compared to those feeding in spring. SDS-PAGE showed a high heterogeneity of lipolytic enzymes in C. 52glacialis, which reflects an extensive accumulation and metabolization of internal lipid. One band of proteolytic 53 activity was found and it intensified with the onset of the algal blooms. Females and younger developmental 54 stages showed high digestive enzyme activities when they resided in surface water and low activities when they 55 were in deep water. High enzyme activities were closely correlated to the onset of ice algae bloom in spring. 56However, the copepods descended in autumn even though food was still available. These results suggest that C. 57glacialis should be benefit from an earlier ice-break up on thus, earlier algal blooms in the season, but that the 58 copepods would not benefit from long lasting phytoplankton blooms.

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Feeding history can influence physiological responses of copepods: an experimental study comparing different cohorts of Temora longicornis from the Southern North Sea

Cited by 5 publications

References 42 publications

To Regulate or Not to Regulate: Assimilation of Dietary Fatty Acids in the Temperate Copepod Temora longicornis

To Regulate or Not to Regulate: Assimilation of Dietary Fatty Acids in the Temperate Copepod Temora longicornis

Variability of energy density among mesozooplankton community: New insights in functional diversity to forage fish

A year-round study on digestive enzymes in the Arctic copepod Calanus glacialis: implications for its capability to adjust to changing environmental conditions

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