do pelagic grazers benefit from sea ice? insights from the antarctic sea ice proxy ipso25
Clicks: 119
ID: 253501
2018
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This
article has not been analysed, so there is no overall score —
reader engagement is measured and shown alongside.
Reader Engagement
Emerging Content
30.0
/100
119 views
15 readers
AI Quality Assessment
Not analyzed
Readership in this journal
EmergingRanked #272 of 345 articles by views in tetrahedron letters
Most read
Least read
Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 345 in total.
Mint this article as an NFT
Not yet mintedCreate a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.
5
SUSD
one-off · no wallet required
Abstract
Sea ice affects primary production in polar regions in multiple ways. It can
dampen water column productivity by reducing light or nutrient supply,
provide a habitat for ice algae and condition the marginal ice zone (MIZ) for
phytoplankton blooms on its seasonal retreat. The relative importance of
three different carbon sources (sea ice derived, sea ice conditioned, non-sea-ice associated) for the polar food
web is not well understood, partly due to the lack of methods that enable
their unambiguous distinction. Here we analysed two highly branched
isoprenoid (HBI) biomarkers to trace sea-ice-derived and sea-ice-conditioned
carbon in Antarctic krill (Euphausia superba) and relate their
concentrations to the grazers' body reserves, growth and recruitment. During
our sampling in January–February 2003, the proxy for sea ice diatoms (a
di-unsaturated HBI termed IPSO25,
δ13C = −12.5 ± 3.3 ‰) occurred in open waters
of the western Scotia Sea, where seasonal ice retreat was slow. In suspended
matter from surface waters, IPSO25 was present at a few stations close
to the ice edge, but in krill the marker was widespread. Even at stations
that had been ice-free for several weeks, IPSO25 was found in krill
stomachs, suggesting that they gathered the ice-derived algae from below the
upper mixed layer. Peak abundances of the proxy for MIZ diatoms (a
tri-unsaturated HBI termed HBI III,
δ13C = −42.2 ± 2.4 ‰) occurred in regions of
fast sea ice retreat and persistent salinity-driven stratification in the
eastern Scotia Sea. Krill sampled in the area defined by the ice edge bloom
likewise contained high amounts of HBI III. As indicators for the grazer's
performance we used the mass–length ratio, size of digestive gland and
growth rate for krill, and recruitment for the biomass-dominant calanoid
copepods Calanoides acutus and Calanus propinquus. These
indices consistently point to blooms in the MIZ as an important feeding
ground for pelagic grazers. Even though ice-conditioned blooms are of much
shorter duration than blooms downstream of the permanently sea-ice-free South
Georgia, they enabled fast growth and offspring development. Our study shows
two rarely considered ways that pelagic grazers may benefit from sea ice:
firstly, after their release from sea ice, suspended or sinking ice algae can
supplement the grazers' diet if phytoplankton concentrations are low.
Secondly, conditioning effects of seasonal sea ice can promote pelagic
primary production and therefore food availability in spring and summer.
| Reference Key |
schmidt2018biogeosciencesdo
Use this key to autocite in the manuscript while using
SciMatic Manuscript Manager or Thesis Manager
|
|---|---|
| Authors | ;K. Schmidt;T. A. Brown;T. A. Brown;S. T. Belt;L. C. Ireland;K. W. R. Taylor;S. E. Thorpe;P. Ward;A. Atkinson |
| Journal | tetrahedron letters |
| Year | 2018 |
| DOI |
10.5194/bg-15-1987-2018
|
| URL | |
| Keywords |
Citations
No citations found. To add a citation, contact the admin at info@scimatic.org
Comments
No comments yet. Be the first to comment on this article.