Publication Date:
2022-05-25
Description:
Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Journal of Marine Systems 98-99 (2012): 26-39, doi:10.1016/j.jmarsys.2012.03.003.
Description:
We present results on phytoplankton and bacterial production and related hydrographic
properties collected on nine annual summer cruises along the western Antarctic Peninsula. This
region is strongly influenced by interannual variations in the duration and extent of sea ice cover,
necessitating a decade-scale study. Our study area transitions from a nearshore region influenced
by summer runoff from glaciers to an offshore, slope region dominated by the Antarctic
Circumpolar Current. The summer bacterial assemblage is the product of seasonal warming and
freshening following spring sea ice retreat and the plankton succession occurring in that evolving
water mass. Bacterial production rates averaged 20 mgC m-2 d-1 and were a low (5%) fraction of
the primary production (PP). There was significant variation in BP between regions and years,
reflecting the variability in sea ice, Chlorophyll and PP. Leucine incorporation was significantly
correlated (r2 ranging 0.2-0.7, p〈0.001) with both chlorophyll and PP across depths, regions and
years indicating strong phytoplankton-bacteria coupling. Relationships with temperature were
variable, including positive, negative and insignificant relationships (r2 〈0.2 for regressions with
p〈0.05). Bacterial production is regulated indirectly by variations in sea ice cover within regions
and over years, setting the levels of phytoplankton biomass accumulation and PP rates; these in
turn fuel BP, to which PP is coupled via direct release from phytoplankton or other less direct
pathways.
Description:
This research was supported by NSF Grants OPP-0217282 and 0823101
from the Antarctic Organisms and Ecosystems Program to HWD.
Keywords:
Bacteria
;
Antarctica
;
Bacterial production
;
Primary production
;
Sea ice
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
application/pdf
