Feeding rates and selectivity among nauplii, copepodites and adult females of Calanus finmarchicus and Calanus helgolandicus

Meyer, Bettina; Irigoien, Xabier; Graeve, Martín; Head, Robert; Harris, Roger P.

doi:10.1007/s10152-002-0105-3

Cited by 56 publications

(11 citation statements)

References 33 publications

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“…20 cells (Smayda and Boleyn 1966), and such chain length plasticity may provide an effective refuge from size-dependent grazing. It has previously been shown that grazing rates of copepods in the genus Calanus were higher on diatom chains than on singlecelled diatoms (Richman and Rogers 1969;Meyer et al 2002). These size-related changes in grazing impact may thus have large effects on pelagic ecosystems and energy flows, especially when found among ecologically dominant species (Smayda and Boleyn 1966).…”

mentioning

confidence: 98%

Grazer‐induced chain length plasticity reduces grazing risk in a marine diatom

Bergkvist

Thor

Jakobsen³

et al. 2012

Limnology & Oceanography

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We show that Skeletonema marinoi suppresses chain formation in response to copepod cues. The presence of three different copepod species (Acartia tonsa, Centropages hamatus, or Temora longicornis) significantly reduced chain length. Furthermore, chain length was significantly reduced when S. marinoi was exposed to chemical cues from caged A. tonsa without physical contact with the responding cells. The reductions in chain length significantly reduced copepod grazing; grazing rates on chains (four cells or more) were several times higher compared to that of single cells. This suggests that chain length plasticity is a means for S. marinoi to reduce copepod grazing. In contrast, chain length was not suppressed in cultures exposed to the microzooplankton grazer Gyrodinium dominans. Size-selective predation may have played a key role in the evolution of chain formation and chain length plasticity in diatoms.

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mentioning

confidence: 98%

Grazer‐induced chain length plasticity reduces grazing risk in a marine diatom

Bergkvist

Thor

Jakobsen³

et al. 2012

Limnology & Oceanography

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“…Specific filtration rates set to 14 and 18 mL/mm/day for the low and high prediction, respectively, for an approximate fit. Right panel measured ingestion rates (Meyer et al 2002) versus volumetric length (calculated from reported C content, for stage N4/5-adult). Model predictions using two values for the scaled functional response, the lower estimate providing an approximate fit to the data …”

Section: Resultsmentioning

confidence: 99%

“…Data on filtration and ingestion rates for different stages were taken from Marshall and Orr (1956) and Meyer et al (2002). Data were extracted from the graphs in the original publications using the freeware PlotReader (http://jornbr.home.xs4all.nl/plotreader).…”

Section: Methodsmentioning

confidence: 99%

“…To provide a reality check on the model and its parameterisation, we compare the assimilation rates from the model to values for filtration and feeding rates as a function of body size from the literature (Marshall and Orr 1956; Meyer et al 2002). The assimilation flux in the model (, Table 2) can be translated into a carbon-based feeding rate (in mg C/day) as follows:As the assimilation flux is stepped-up at puberty (the factor in Fig.…”

Section: Methodsmentioning

confidence: 99%

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Modelling the dynamics of growth, development and lipid storage in the marine copepod Calanus finmarchicus

Jager¹,

Salaberria

Altin³

et al. 2016

Mar Biol

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Mechanistic models are essential tools for interpreting and predicting the consequences of a changing environment and stressors such as pollution on the life histories of marine organisms. Here, we apply the simple and generic energy-budget model DEBkiss to the life history of the marine copepod Calanus finmarchicus. Model modifications were needed to accommodate the copepod life cycle, which deviates in several respects from most other animals (e.g., a sudden stop of growth after the final moult). We identified an acceleration of growth in the early copepodite stages, which could be linked to an increase in the specific feeding rate of the animals. Lipid storage, an essential element of C. finmarchicus biology, was successfully captured with the reproduction buffer of the DEBkiss model. The resulting model was fitted to a detailed data set from the literature and was able to explain growth, development and lipid storage from egg to adult, at different temperatures and food availabilities, within a single consistent framework. The parameterised model could subsequently be used to elucidate the energetic constraints on gonad maturation and reproduction. Interestingly, the overhead costs for egg production seem to be substantially higher than the default value applied in DEB-based studies. The current model provides a solid basis for applications in stress ecology, although our model analysis also identified several knowledge gaps. Specifically, further research is needed to cover the dynamics of diapause and gonad maturation, to explain the dependence of maximum body size on food and temperature, and to verify the predicted high costs for maturity maintenance.Electronic supplementary materialThe online version of this article (doi:10.1007/s00227-016-3030-8) contains supplementary material, which is available to authorised users.

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“…Between the last nauplius (NVI) and the first copepodite (CI) stage there is high mortality (Peterson 2001) associated with major morphological modifications, which include changes in swimming and feeding behavior, changes in the sensory system, and a reorganization of the nervous system (Paffenhöfer and Lewis 1989; Peterson 2001; Wilson and Hartline 2011). These changes have stoichiometric implications: body carbon-specific ingestion rates of nauplii are high and typically exceed 100% of body C per day (Meyer et al 2002; Henriksen et al 2007; Jungbluth et al 2017), while those of adult copepods are below 30% of body C per day (Meyer et al 2002). Furthermore, C:N ratios are lower in nauplii than copepodites (Campbell et al 2001).…”

Section: Discussionmentioning

confidence: 99%

The effects of food stoichiometry and temperature on copepods are mediated by ontogeny

et al. 2018

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Climate change is warming the oceans, increasing carbon dioxide partial pressure and reducing nutrient recycling from deep layers. This will affect carbon (C) and phosphorus (P) availability in the oceans, thus, altering the balance between the nutrient content of consumers and their food resource. The combined effects of food quality and temperature have been investigated for adult copepods; however, nauplii, the early developmental stages of copepods, often far outnumber adults, grow more rapidly and have a higher phosphorus body content and demand than later life stages. Consequently, ontogeny may affect how copepods respond to the combined stressors of increasing temperature and altered food stoichiometry. We conducted temperature-controlled experiments (24, 28 and 32 °C) where Parvocalanus crassirostris was fed either a P-replete or a P-limited phytoplankton food source. Reduced survival of nauplii and copepodites at the highest temperature was ameliorated when fed P-replete food. At higher temperatures, copepodite growth remained stable, but internal C:P stoichiometry diverged in the direction of phytoplankton C:P, suggesting that increased temperature affected copepodite stoichiometric homeostasis. In contrast, naupliar P content increased with temperature and naupliar growth was P limited, suggesting nauplii required additional phosphorus at higher temperatures. We conclude that resource stoichiometry plays a key role in how copepod survival and growth are impacted by temperature, and that ontogeny mediates these responses. Our results suggest that as the extent of warming oceans and phytoplankton nutrient limitation increase, copepod survival and the growth of early life stages may decline.Electronic supplementary materialThe online version of this article (10.1007/s00442-018-4183-6) contains supplementary material, which is available to authorized users.

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Feeding rates and selectivity among nauplii, copepodites and adult females of Calanus finmarchicus and Calanus helgolandicus

Cited by 56 publications

References 33 publications

Grazer‐induced chain length plasticity reduces grazing risk in a marine diatom

Grazer‐induced chain length plasticity reduces grazing risk in a marine diatom

Modelling the dynamics of growth, development and lipid storage in the marine copepod Calanus finmarchicus

The effects of food stoichiometry and temperature on copepods are mediated by ontogeny

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