Mesoscale variability in intact and ghost colonies of Phaeocystis antarctica in the Ross Sea : distribution and abundance
Smith, Walker O.
McGillicuddy, Dennis J.
Olson, Elise M. B.
Peacock, Emily E.
Sosik, Heidi M.
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Phaeocystis, a genus with a cosmopolitan distribution and a polymorphic life cycle, was observed during summer in the Ross Sea, Antarctica, where large blooms of this haptophyte regularly occur. The mesoscale vertical and horizontal distributions of colonies of P. antarctica were assessed using a towed Video Plankton Recorder (VPR). The mean size of colonies was 1.20 mm, and mean abundances within the three VPR surveys were 4.86, 1.96, and 11.5 mL-1. In addition to the typical spherical, transparent colonies, the VPR quantified an optically dissimilar form of colony that had a distinctive translucent appearance. It also measured the abundance of collapsed colonies, similar to those observed previously from cultures and mesocosms, which we called “ghost colonies”. The translucent colonial form had a different distribution than the more common colonial form, and at times was more abundant. Relative to intact colonies, the ghost colonies occurred less frequently, with mean abundances in the three surveys being 0.01, 0.08, and 0.0004 mL-1. Ghost colonies generally were found below the euphotic zone, where they often were in greater abundance than intact colonies. However, the relationship of ghost colonies to intact P. antarctica colonies was not direct or consistent, suggesting that the formation of ghost colonies from living colonies and their appearance within the water column were not tightly coupled. Given their relative scarcity and low carbon content, it is unlikely that ghost colonies contribute substantially to vertical flux; however, it is possible that we did not sample periods of major flux events, and as a result minimized the importance of ghost colonies to vertical flux. They do, however, represent a poorly documented feature of polar haptophyte life cycles.
© The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Marine Systems 166 (2017): 97-107, doi:10.1016/j.jmarsys.2016.05.007.
Suggested CitationPreprint: Smith, Walker O., McGillicuddy, Dennis J., Olson, Elise M. B., Kosnyrev, Valery, Peacock, Emily E., Sosik, Heidi M., "Mesoscale variability in intact and ghost colonies of Phaeocystis antarctica in the Ross Sea : distribution and abundance", 2016-05, https://doi.org/10.1016/j.jmarsys.2016.05.007, https://hdl.handle.net/1912/8682
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Abundance and size distribution of abandoned (ghost) Phaeocystis colonies from profiles conducted during R/V Polar Star cruises in the Ross Sea, Antarctica between 2001 and 2005. Asper, Vernon L.; Smith, Walker O. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2019-06-12)“This data set replaces https://hdl.handle.net/1912/24232 or DOI:10.1575/1912/bco-dmo.768570.1.” Abundance and size distribution of abandoned (ghost) Phaeocystis colonies from profiles conducted during R/V Polar Star ...
Abundance and size distribution of abandoned (ghost) Phaeocystis colonies from profiles conducted during R/V Polar Star cruises in the Ross Sea, Antarctica between 2001 and 2005. Asper, Vernon L.; Smith, Walker O. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: firstname.lastname@example.org, 2019-06-10)“This data set has been updated. Please refer to https://hdl.handle.net/1912/24266 or DOI:10.1575/1912/bco-dmo.768570.2 for the latest version of the data set.” Abundance and size distribution of abandoned (ghost) Phaeocystis ...
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