Carbon fluxes and pelagic ecosystem dynamics near two western Antarctic Peninsula Adélie penguin colonies: an inverse model approach

Sailley, SF; Ducklow, HW; Moeller, HV; Fraser, WR; Schofield, OM; Steinberg, DK; Garzio, LM; Doney, SC. 2013 Carbon fluxes and pelagic ecosystem dynamics near two western Antarctic Peninsula Adélie penguin colonies: an inverse model approach. Marine Ecology Progress Series, 492. 253-272. 10.3354/meps10534

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Official URL: http://dx.doi.org/10.3354/meps10534

Abstract/Summary

An inverse food-web model for the western Antarctic Peninsula (WAP) pelagic food web was constrained with data from Palmer Long Term Ecological Research (PAL-LTER) project annual austral summer sampling cruises. Model solutions were generated for 2 regions with Adelie penguin Pygoscelis adeliae colonies presenting different population trends (a northern and a southern colony) for a 12 yr period (1995-2006). Counter to the standard paradigm, comparisons of carbon flow through bacteria, microzooplankton, and krill showed that the diatom-krill-top predator food chain is not the dominant pathway for organic carbon exchanges. The food web is more complex, including significant contributions by microzooplankton and the microbial loop. Using both inverse model results and network indices, it appears that in the northern WAP the food web is dominated by the microbial food web, with a temporal trend toward its increasing importance. The dominant pathway for the southern WAP food web varies from year to year, with no detectable temporal trend toward dominance of microzooplankton versus krill. In addition, sensitivity analyses indicated that the northern colony of Adelie penguins, whose population size has been declining over the past 35 yr, appears to have sufficient krill during summer to sustain its basic metabolic needs and rear chicks, suggesting the importance of other processes in regulating the Adelie population decline.

Item Type: Publication - Article
Subjects: Biology
Ecology and Environment
Technology
Divisions: Plymouth Marine Laboratory > Science Areas > Today's Models Tomorrow's Futures
Depositing User: Mrs Julia Crocker
Date made live: 27 Feb 2014 16:51
Last Modified: 06 Jun 2017 16:10
URI: http://plymsea.ac.uk/id/eprint/5568

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