Impact of Microsetella norvegica on carbon flux attenuation and as a secondary producer during the polar night in the subarctic Porsangerfjord

Mooney, Ben D.; Iversen, Morten Hvitfeldt; Norrbin, Fredrika

doi:10.3389/fmars.2023.996275

Cited by 3 publications

(1 citation statement)

References 51 publications

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“…Many small copepod taxa are particle-feeders and can decrease POC export efficiency through feeding on organic particles (e.g. Koski et al, 2020;Koski and Lombard, 2022;Mooney et al, 2023). A shift of the copepod community towards smaller species will possibly be reflected in a compositional and quantitative change of the vertical flux in the Barents Sea.…”

Section: Changes In Copepod Secondary Production and The Marine Food Webmentioning

confidence: 99%

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Gawinski,

Daase,

Primicerio

et al. 2024

Front. Mar. Sci.

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The reduction of Arctic summer sea ice due to climate change can lead to increased primary production in parts of the Barents Sea if sufficient nutrients are available. Changes in the timing and magnitude of primary production may have cascading consequences for the zooplankton community and ultimately for higher trophic levels. In Arctic food webs, both small and large copepods are commonly present, but may have different life history strategies and hence different responses to environmental change. We investigated how contrasting summer sea-ice cover and water masses in the northern Barents Sea influenced the copepod community composition and secondary production of small and large copepods along a transect from 76°N to 83°N in August 2018 and August 2019. Bulk abundance, biomass, and secondary production of the total copepod community did not differ significantly between the two years. There were however significant spatial differences in the copepod community composition and production, with declining copepod abundance from Atlantic to Arctic waters and the highest copepod biomass and production on the Barents Sea shelf. The boreal Calanus finmarchicus showed higher abundance, biomass, and secondary production in the year with less sea-ice cover and at locations with a clear Atlantic water signal. Significant differences in the copepod community between areas in the two years could be attributed to interannual differences in sea-ice cover and Atlantic water inflow. Small copepods contributed more to secondary production in areas with no or little sea ice and their production was positively correlated to water temperature and ciliate abundance. Large copepods contributed more to secondary production in areas with extensive sea ice and their production was positively correlated with chlorophyll a concentration. Our results show how pelagic communities might function in a future ice-free Barents Sea, in which the main component of the communities are smaller copepods, and the secondary production they generate is available in energetically less resource-rich portions.

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Section: Changes In Copepod Secondary Production and The Marine Food Webmentioning

confidence: 99%

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Gawinski,

Daase,

Primicerio

et al. 2024

Front. Mar. Sci.

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Impact of aggregate‐colonizing copepods on the biological carbon pump in a high‐latitude fjord

Svensen,

Iversen,

Norrbin

et al. 2024

Limnology & Oceanography

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Zooplankton consumption of sinking aggregates affects the quality and quantity of organic carbon exported to the deep ocean. Increasing laboratory evidence shows that small particle‐associated copepods impact the flux attenuation by feeding on sinking particles, but this has not been quantified in situ. We investigated the impact of an abundant particle‐colonizing copepod, Microsetella norvegica, on the attenuation of the vertical carbon flux in a sub‐Arctic fjord. This study combines field measurements of vertical carbon flux, abundance, and size‐distribution of marine snow and degradation rates of fecal pellets and algal aggregates. Female M. norvegica altered their feeding behavior when exposed to aggregates, and ingestion rates were 0.20 μg C ind.−1 d−1 on marine snow and 0.11 μg C ind.−1 d−1 on intact krill fecal pellets, corresponding to 48% and 26% of the females' body carbon mass. Due to high sea surface abundance of up to ~ 50 ind. L−1, the population of M. norvegica had the potential to account for almost all the carbon removal in the upper 50 m of the water column, depending on the type of the aggregate. Our observations highlight the potential importance of abundant small‐sized copepods for biogeochemical cycles through their impact on export flux and its attenuation in the twilight zone.

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Understanding the picture: the promise and challenges of in-situ imagery data in the study of plankton ecology

Barth,

Stone

2024

Journal of Plankton Research

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Planktons are a fundamental piece of all ocean ecosystems yet, sampling plankton at the high resolution required to understand their dynamics remains a challenge. In-situ imaging tools offer an approach to sample plankton at fine scales. Advances in technology and methodology provide the ability to make in-situ imaging a common tool in plankton ecology. Despite the massive potential of in-situ imaging tools, there are no standard approaches for analyzing the associated data. Consequently, studies are inconsistent in analyzing in-situ imaging data, even for similar questions. This introduces challenges in comparing across studies and sampling devices. In this review, we briefly summarize the increasing use, potential and novel applications of in-situ imaging tools in plankton ecology. Then, we synthesize the common analyses used across these studies. Finally, we address the major statistical challenges associated with the unique sampling mechanisms of in-situ imaging tools and discuss the theoretical uncertainties, which arise from the low-sampling volumes of many in-situ imaging tools. To fully unlock the power of in-situ imaging tools in plankton ecological studies, researchers must carefully consider how to analyze their data. We provide recommendations for processing and analyzing data while also acknowledging a large need for developing new statistical tool.

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Impact of Microsetella norvegica on carbon flux attenuation and as a secondary producer during the polar night in the subarctic Porsangerfjord

Cited by 3 publications

References 51 publications

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Response of the copepod community to interannual differences in sea-ice cover and water masses in the northern Barents Sea

Impact of aggregate‐colonizing copepods on the biological carbon pump in a high‐latitude fjord

Understanding the picture: the promise and challenges of in-situ imagery data in the study of plankton ecology

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