Cascading effects of calanoid copepod functional groups on the biological carbon pump in the subtropical South Atlantic

Oliveira, Lívia Dias Fernandes de; Bode-Dalby, Maya; Schukat, Anna; Auel, Holger; Hagen, Wilhelm

doi:10.3389/fmars.2022.920483

Cited by 2 publications

(2 citation statements)

References 107 publications

(181 reference statements)

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“…Among them, Farranula spp., Acrocalanus spp., and Calocalanus spp. have been reported as non-diel verti- cal migrants (Lo et al 2004a, Oliveira et al 2022, Tao et al 2022. Oncaea spp.…”

Section: Discussionmentioning

confidence: 99%

Variations in photoprotective compounds in surface-dwelling copepods in subtropical open waters

Chen,

Kuwahara,

Katayama

et al. 2023

Plankton Benthos Res

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We measured the concentrations of photoprotective compounds, carotenoids and mycosporine-like amino acids (MAAs), in surface-dwelling copepods in relation to their vertical distribution patterns along a zonal transect in the subtropical North Pacific to better understand their adaptation to strong ultraviolet (UV) radiation. All the dominant copepod groups analysed had detectable levels of both photoprotective compounds, while the concentrations differed among taxonomic groups. Farranula spp. had high carotenoid and MAA content (mean carotenoids: 0.0656; mean MAAs: 0.0230 µg mg dry wt −1 ) and the accumulation of MAAs correlated positively with in-situ UV penetration, explaining their constant occurrence in the surface layer throughout the transect. Oncaea spp. and Acrocalanus spp. had higher levels of carotenoids than MAAs and showed variable vertical distribution patterns regardless of UV penetration, suggesting that carotenoids are used only temporally to mitigate the effect of UV radiation. In contrast, Clausocalanus spp. and Calocalanus spp. had the lowest concentrations of both photoprotective compounds (mean carotenoids: 0.0148 and 0.0209; mean MAAs: 0.0015 and 0.0029 µg mg dry wt −1 ). The mean weighted depth of Clausocalanus spp. showed a significant negative relationship with UV penetration, suggesting that they mitigated the harmful effects of UV radiation through behavioural responses. Calocalanus spp. may have adapted to subtropical surface waters with relatively low photoprotective compound concentrations. Our study demonstrated that surface-dwelling subtropical copepods exhibit taxon-specific patterns in photoprotective compound concentrations that are adaptations to intense UV radiation, which is crucial for understanding the high species diversity of copepod communities in subtropical open waters.

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“…Among them, Farranula spp., Acrocalanus spp., and Calocalanus spp. have been reported as non-diel verti- cal migrants (Lo et al 2004a, Oliveira et al 2022, Tao et al 2022. Oncaea spp.…”

Section: Discussionmentioning

confidence: 99%

Variations in photoprotective compounds in surface-dwelling copepods in subtropical open waters

Chen,

Kuwahara,

Katayama

et al. 2023

Plankton Benthos Res

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“…Comparing the vertical distribution of zooplankton model estimates is vital as they play an important role in the biological carbon pump through active vertical carbon transport. Diel migrants can represent a large portion of the total carbon export for an area (Kwong et al, 2020;Oliviera et al, 2022) while the seasonal migration of diapausing copepods in higher latitudes offer a sustained transport of carbon export and sequestration to deeper waters (Pinti et al, 2023). Since Longhurst's definition of 56 biogeochemical provinces, there have been numerous studies that partition the ocean based on biogeochemical and physical properties (Longhurst, 2007) and bulk properties or community composition of plankton (e.g.…”

Section: Discussionmentioning

confidence: 99%

Using ecological partitions to assess zooplankton biogeography and seasonality

et al. 2023

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Zooplankton play a crucial role in marine ecosystems as the link between the primary producers and higher trophic levels, and as such they are key components of global biogeochemical and ecosystem models. While phytoplankton spatial-temporal dynamics can be tracked using satellite remote sensing, no analogous data product is available to validate zooplankton model output. We develop a procedure for linking irregular and sparse observations of mesozooplankton biomass with model output to assess regional seasonality of mesozooplankton. We use output from a global biogeochemical/ecosystem model to partition the ocean according to seasonal patterns of modeled mesozooplankton biomass. We compare the magnitude and temporal dynamics of the model biomass with in situ observations averaged within each partition. Our analysis shows strong correlations and little bias between model and data in temperate, strongly seasonally variable regions. Substantial discrepancies exist between model and observations within the tropical partitions. Correlations between model and data in the tropical partitions were not significant and in some cases negative. Seasonal changes in tropical mesozooplankton biomass were weak, driven primarily by local perturbations in the velocity and extent of currents. Microzooplankton composed a larger fraction of total zooplankton biomass in these regionsWe also examined the ability of the model to represent several dominant taxonomic groups. We identified several Calanus species in the North Atlantic partitions and Euphausiacea in the Southern Ocean partitions that were well represented by the model. This partition-scale comparison captures biogeochemically important matches and mismatches between data and models, suggesting that elaborating models by adding trait differences in larger zooplankton and mixotrophy may improve model-data comparisons. We propose that where model and data compare well, sparse observations can be averaged within partitions defined from model output to quantify zooplankton spatio-temporal dynamics.

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Cascading effects of calanoid copepod functional groups on the biological carbon pump in the subtropical South Atlantic

Cited by 2 publications

References 107 publications

Variations in photoprotective compounds in surface-dwelling copepods in subtropical open waters

Variations in photoprotective compounds in surface-dwelling copepods in subtropical open waters

Using ecological partitions to assess zooplankton biogeography and seasonality

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