Diel metabolic patterns in a migratory oceanic copepod

Tarrant, Ann M.; McNamara-Bordewick, Nora; Blanco-Bercial, Leocadio; Miccoli, Andrea; Maas, Amy E.

doi:10.1016/j.jembe.2021.151643

Cited by 10 publications

(21 citation statements)

References 61 publications

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“…Species in this group can also repackage particles into larger and faster‐sinking faecal pellets or can fragment sinking POC, particularly by sloppy feeding, into smaller and slower‐sinking particles. Additionally, Diel Vertical Migrations (DVM) realized by some mesozooplankton species between the surface and the deep ocean increase the export of dissolved carbon and the remineralisation of nutrients at depth (Kelly et al., 2019; Tarrant et al., 2021). Hence, mesozooplankton is a highly diverse group in terms of species, ecological strategies, size and among others (Litchman et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Morphological and taxonomic diversity of mesozooplankton is an important driver of carbon export fluxes in the ocean

Perhirin,

Gossner,

Godfrey

et al. 2023

Molecular Ecology Resources

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Mesozooplankton is a very diverse group of small animals ranging in size from 0.2 to 20 mm not able to swim against ocean currents. It is a key component of pelagic ecosystems through its roles in the trophic networks and the biological carbon pump. Traditionally studied through microscopes, recent methods have been however developed to rapidly acquire large amounts of data (morphological, molecular) at the individual scale, making it possible to study mesozooplankton using a trait‐based approach. Here, combining quantitative imaging with metabarcoding time‐series data obtained in the Sargasso Sea at the Bermuda Atlantic Time‐series Study (BATS) site, we showed that organisms' transparency might be an important trait to also consider regarding mesozooplankton impact on carbon export, contrary to the common assumption that just size is the master trait directing most mesozooplankton‐linked processes. Three distinct communities were defined based on taxonomic composition, and succeeded one another throughout the study period, with changing levels of transparency among the community. A co‐occurrences' network was built from metabarcoding data revealing six groups of taxa. These were related to changes in the functioning of the ecosystem and/or in the community's morphology. The importance of Diel Vertical Migration at BATS was confirmed by the existence of a group made of taxa known to be strong migrators. Finally, we assessed if metabarcoding can provide a quantitative approach to biomass and/or abundance of certain taxa. Knowing more about mesozooplankton diversity and its impact on ecosystem functioning would allow to better represent them in biogeochemical models.

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Section: Introductionmentioning

confidence: 99%

Morphological and taxonomic diversity of mesozooplankton is an important driver of carbon export fluxes in the ocean

Perhirin,

Gossner,

Godfrey

et al. 2023

Molecular Ecology Resources

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“…This visual arms race is exceptionally well documented 13 and is potentially the largest daily migration of biomass on earth 14 . Furthermore, DVM is central to population and food chain structure 15 and biogeochemical cycles 16 , 17 .…”

Section: Resultsmentioning

confidence: 99%

Animal behavior is central in shaping the realized diel light niche

et al. 2022

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Animal behavior in space and time is structured by the perceived day/night cycle. However, this is modified by the animals’ own movement within its habitat, creating a realized diel light niche (RDLN). To understand the RDLN, we investigated the light as experienced by zooplankton undergoing synchronized diel vertical migration (DVM) in an Arctic fjord around the spring equinox. We reveal a highly dampened light cycle with diel changes being about two orders of magnitude smaller compared to the surface or a static depth. The RDLN is further characterized by unique wavelength-specific irradiance cycles. We discuss the relevance of RDLNs for animal adaptations and interactions, as well as implications for circadian clock entrainment in the wild and laboratory.

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“…Homogenates were centrifuged at 14,000g for 20 minutes at 4°C, and the supernatant was retained. Citrate synthase activity was measured with a modification the protocol of Hawkins et al (2016) and normalized to wet weight, as described previously (Tarrant, McNamara-Bordewick, et al, 2021). Normality of the residuals and equality of variance were verified using the Shapiro Wilkes test and Levene's tests, respectively.…”

Section: Citrate Synthase Activitymentioning

confidence: 99%

Nutritional condition drives spatial variation in physiology of Antarctic lipid-storing copepods

Berger,

Steinberg,

Tarrant

2023

Preprint

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Lipid-rich copepods form an essential link between primary producers and higher trophic levels in high-latitude oceans. These zooplankton can take advantage of ephemeral phytoplankton blooms to fuel development and reproduction. However, we have limited understanding of how the physiological condition of these animals varies in relation to environmental factors such as food availability. Due to high advection, it is likely that physiological plasticity, rather than local adaptation, is primarily responsible for physiological differences within a region. We use transcriptomics and other physiological metrics to understand how two species of copepods (Calanoides acutusandCalanus propinquus) vary across environmental gradients along the West Antarctic Peninsula. For the primarily herbivorousC. acutus, physiological separation between sampling locations appears to be driven by feeding status, and gene expression differences indicate differential expression of genes regulating lipid metabolism, reproduction, aerobic metabolism, and protein translation. For the more omnivorousC. propinquus,physiology and gene expression did not segregate as clearly by location, showed minimal signs of food deprivation at any location, and had a weaker relationship with chlorophyll compared toC. acutus. By comparing these results with concurrent starvation experiments, we find thatspatial variation in gene expression reflects short-term differences in food availability (particularly forC. acutus,), and we identify genes whose expression indicates recent feeding status. Further examination of the relationships between food availability, copepod physiology, and population dynamics will ultimately improve our capacity to predict how copepod populations will respond to rapidly changing environmental conditions in the West Antarctic Peninsula ecosystem.

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Diel metabolic patterns in a migratory oceanic copepod

Cited by 10 publications

References 61 publications

Morphological and taxonomic diversity of mesozooplankton is an important driver of carbon export fluxes in the ocean

Morphological and taxonomic diversity of mesozooplankton is an important driver of carbon export fluxes in the ocean

Animal behavior is central in shaping the realized diel light niche

Nutritional condition drives spatial variation in physiology of Antarctic lipid-storing copepods

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