Skip header and navigation

1 records – page 1 of 1.

Climatically driven fluctuations in Southern Ocean ecosystems.

https://arctichealth.org/en/permalink/ahliterature84114
Source
Proc Biol Sci. 2007 Oct 16;
Publication Type
Article
Date
Oct-16-2007
Author
MurphyEugene J
TrathanPhilip N
WatkinsJon L
ReidKeith
MeredithMichael P
ForcadaJaume
ThorpeSally E
JohnstonNadine M
RotheryPeter
Author Affiliation
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, Cambridgeshire CB3 0ET, UK.
Source
Proc Biol Sci. 2007 Oct 16;
Date
Oct-16-2007
Language
English
Publication Type
Article
Abstract
Determining how climate fluctuations affect ocean ecosystems requires an understanding of how biological and physical processes interact across a wide range of scales. Here we examine the role of physical and biological processes in generating fluctuations in the ecosystem around South Georgia in the South Atlantic sector of the Southern Ocean. Anomalies in sea surface temperature (SST) in the South Pacific sector of the Southern Ocean have previously been shown to be generated through atmospheric teleconnections with El Niño Southern Oscillation (ENSO)-related processes. These SST anomalies are propagated via the Antarctic Circumpolar Current into the South Atlantic (on time scales of more than 1 year), where ENSO and Southern Annular Mode-related atmospheric processes have a direct influence on short (less than six months) time scales. We find that across the South Atlantic sector, these changes in SST, and related fluctuations in winter sea ice extent, affect the recruitment and dispersal of Antarctic krill. This oceanographically driven variation in krill population dynamics and abundance in turn affects the breeding success of seabird and marine mammal predators that depend on krill as food. Such propagating anomalies, mediated through physical and trophic interactions, are likely to be an important component of variation in ocean ecosystems and affect responses to longer term change. Population models derived on the basis of these oceanic fluctuations indicate that plausible rates of regional warming of 1oC over the next 100 years could lead to more than a 95% reduction in the biomass and abundance of krill across the Scotia Sea by the end of the century.
PubMed ID
17939986 View in PubMed
Less detail