Abstract
In the Southern Ocean, pteropods play an important role in biogeochemical cycling, and sediment traps are a valuable tool for investigating this role through the collection of passively sinking matter from productive surface waters to deep sea layers. Observations of ‘swimmers’ (e.g. organisms that actively swim into traps) can also prove valuable for studying zooplankton community structure. In this study, we used two separate sediment trap studies during the 2016–2017 summer to study pteropod population structure over time scales of 24 h and 28 days. In both studies, highest densities were measured for veliger-stage Limacina helicina antarctica (0.09–0.3 mm) relative to all species and age classes. Increases in shell diameters of veligers in all traps over time enabled the calculation of an intraseasonal potential growth rate of 0.0068 mm d−1. Swimmer flux rates ranged from 121 to 2674 ind. m−2 d−1 at 53 m depth, and the 24-h vertical flux study measured 960 ind. m−2 d−1 at 57 m depth and 6692 m−2 d−1 at 90 m depth. Among a suite of environmental and biological covariates tested, fluorescence and sinking particulate organic and inorganic carbon (POC and PIC) possessed the most predictive power to explain abundances of near-surface pteropod age class and species composition. Gymnosome abundances were largely influenced by increasing adult L. helicina antarctica counts. Changes to pteropod population and community dynamics in response to climate change will have cascading effects throughout Antarctic epipelagic food webs, and these results provide a regional snapshot of patterns in structure and sedimentation from an under-surveyed region of the Southern Ocean.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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The code generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We are grateful to all of the reviewers, including Drs. Guglielmo, Maas, and Vecchione, who have offered valuable editorial suggestions that have vastly improved the quality of this work. We would like to acknowledge the master and crew, technical and scientific teams aboard the TRV Umitaka-maru (Tokyo University of Marine Science and Technology (TUMSAT)) and the icebreaker Shirase for assistance with both deployment and retrieval of the sediment traps used for this research. Cruises were funded for “Physical and chemical observations” by the Japanese Antarctic Research Expedition (JARE) under the Ministry of Education, Culture, Sports, Science and Technology (MEXT) through a Grant-in-Aid for Scientific Research (Grant No. 24255001), as well as Research Project Funds of National Institute of Polar Research (Grant No. KP-308). This work was supported by Australian Antarctic Science Grant No. 4331 and the Holsworth Wildlife Research Endowment (Grant No. 109804) through the Ecological Society of Australia and the Equity Trustees Charitable Foundation. CW was supported, in part, by an internship from the National Institute of Polar Research. RT was supported by the RJL Hawke Postdoctoral Fellowship. We dedicate this manuscript to Dr. Tsuneo Odate who championed strong Japan-Australia research collaborations. He will be greatly missed.
Funding
Research cruises were funded for “Physical and chemical observations” by the Japanese Antarctic Research Expedition (JARE) under the Ministry of Education, Culture, Sports, Science and Technology (MEXT) through a Grant-in-Aid for Scientific Research (Grant No. 24255001), as well as Research Project Funds of National Institute of Polar Research (Grant No. KP-308). This work was supported by Australian Antarctic Science Grant No. 4331 and the Holsworth Wildlife Research Endowment (Grant No. 109804) through the Ecological Society of Australia and the Equity Trustees Charitable Foundation. CW was supported, in part, by an internship from the National Institute of Polar Research. RT was supported by the RJL Hawke Postdoctoral Fellowship.
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Conceptualization: CKW; methodology: CKW; formal analysis and investigation: CKW; writing—original draft preparation: CKW; writing—review and editing: CKW, RT, KMS, RM; funding acquisition: CKW, MM, TO, KMS; resources: RM, KM, ST; supervision: RM, MM, TO, RT, KMS.
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Weldrick, C.K., Makabe, R., Mizobata, K. et al. The use of swimmers from sediment traps to measure summer community structure of Southern Ocean pteropods. Polar Biol 44, 457–472 (2021). https://doi.org/10.1007/s00300-021-02809-4
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DOI: https://doi.org/10.1007/s00300-021-02809-4