Population-specific shifts in viral and microbial abundance within a cryptic upwelling

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dc.contributor.authorPaterson, J.S.
dc.contributor.authorNayar, S.
dc.contributor.authorMitchell, J.G.
dc.contributor.authorSeuront, L.
dc.date.issued2013
dc.description.abstractCoastal upwelling systems play an essential role in bringing cold and nutrient-rich water into the euphotic zone, hence enhancing the biological productivity of the world's oceans. We describe a “cryptic” upwelling occurring in South Australian waters, in which cold upwelled waters do not reach surface waters and do not exhibit a sea surface temperature (SST) signature. Due to the wide continental shelf (ca. 100 km), upwelled waters form a sub-surface cold water pool and are forced north-west after a secondary event. Using flow cytometry we investigated the abundance and composition of viruses, heterotrophic bacteria and pico-phytoplankton within upwelling affected and unaffected waters. Our results identified the presence of upwelled waters at and below the Deep-Chlorophyll Maximum (DCM), where water temperature was at least 4 °C colder than surface waters. In contrast to previous studies, no significant differences were observed between upwelled and non-upwelled waters for most individual viral, bacterial and pico-phytoplankton sub-groups. However, one viral, one bacterial and two pico-phytoplankton sub-groups were significantly more abundant at the DCM. This indicates the presence of depth- and population-specific shifts in abundance and potential niche partitioning of these cytometrically-defined sub-groups that may be related to their host organisms and/or resource availability.
dc.description.statementofresponsibilityJames S. Paterson, Sasi Nayar, James G. Mitchell, Laurent Seuront
dc.identifier.citationJournal of Marine Systems, 2013; 113-114:52-61
dc.identifier.doi10.1016/j.jmarsys.2012.12.009
dc.identifier.issn0924-7963
dc.identifier.issn1879-1573
dc.identifier.orcidNayar, S. [0000-0002-3730-6682]
dc.identifier.urihttp://hdl.handle.net/2440/123409
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/DP0664681
dc.relation.granthttp://purl.org/au-research/grants/arc/DP0988554
dc.rights© 2013 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.jmarsys.2012.12.009
dc.subjectCoastal upwelling; cryptic; viruses; bacteria; pico-phytoplankton; flow cytometry
dc.titlePopulation-specific shifts in viral and microbial abundance within a cryptic upwelling
dc.typeJournal article
pubs.publication-statusPublished

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