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|Title:||Population-specific shifts in viral and microbial abundance within a cryptic upwelling|
|Citation:||Journal of Marine Systems, 2013; 113-114:52-61|
|James S. Paterson, Sasi Nayar, James G. Mitchell, Laurent Seuront|
|Abstract:||Coastal 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.|
|Keywords:||Coastal upwelling; cryptic; viruses; bacteria; pico-phytoplankton; flow cytometry|
|Rights:||© 2013 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Environment Institute publications|
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