Phytoplankton productivity in glaciomarine embayments of the West Antarctic Peninsula is constrained because of extensive thermohaline variability, which is due to seasonal sea-ice and glacial melting. To determine whether or not this affects the biology of the water column, we explored the influence of surface water properties on phytoplankton productivity in four embayments of the South Shetland Islands (SSI) during late summer of 2013. We analyzed hydrographic, climatic, and primary productivity satellite data (wind velocity, sea-ice cover, and chlorophyll-a), in situ CTD measurements of physical and chemical characteristics, new estimates of net primary production (NPP), and surface water samples for chlorophyll-a, nutrients, biogenic silica, and plankton composition. Sea-ice cover at the SSI was ~ 20% during February. Long-term satellite wind data (2010–2015) showed that during February 2013 the average wind velocity was ~ 2 m s−1 higher than the long-term mean with two low sea surface temperature events occurring simultaneously at all sites. The CTD profiles did not show vertical salinity changes, although salinity was highly correlated with the percentage of integrated nanoplankton Chl-a, which represented > 50% of the total integrated Chl-a in all the embayments. Phytoplankton was the major contributor to the integrated carbon biomass of the upper water column, where centric diatoms predominated. The contribution of microzooplankton and bacterioplankton at the different sites explained NPP values and the trophic mode at each site. Specifically, NPP at Fildes Bay exhibited an autotrophic productivity mode in contrast to Collins Bay, where both heterotrophic and autotrophic modes alternated, mainly due to weekly changes in community respiration rates.
Polar Biology – Springer Journals
Published: May 30, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera