Recruitment, Growth and Mortality of an Antarctic Hexactinellid Sponge, Anoxycalyx joubini

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Dayton, P. K., Kim, S., Jarrell, S. C., Oliver, J. S., Hammerstrom, K., Fisher, J. L., … Conlan, K. (2013). Recruitment, Growth and Mortality of an Antarctic Hexactinellid Sponge, Anoxycalyx joubini. PLoS ONE, 8(2). doi:10.1371/journal.pone.0056939
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TitleRecruitment, Growth and Mortality of an Antarctic Hexactinellid Sponge, Anoxycalyx joubini
AuthorsP. Dayton, S. Kim, S. Jarrell, J. Oliver, K. Hammerstrom, J. Fisher, K. O'Connor, J. Barber, G. Robilliard, J. Barry, A. Thurber, K. Conlan
AbstractPolar ecosystems are sensitive to climate forcing, and we often lack baselines to evaluate changes. Here we report a nearly 50-year study in which a sudden shift in the population dynamics of an ecologically important, structure-forming hexactinellid sponge, Anoxycalyx joubini was observed. This is the largest Antarctic sponge, with individuals growing over two meters tall. In order to investigate life history characteristics of Antarctic marine invertebrates, artificial substrata were deployed at a number of sites in the southern portion of the Ross Sea between 1967 and 1975. Over a 22-year period, no growth or settlement was recorded for A. joubini on these substrata; however, in 2004 and 2010, A. joubini was observed to have settled and grown to large sizes on some but not all artificial substrata. This single settlement and growth event correlates with a region-wide shift in phytoplankton productivity driven by the calving of a massive iceberg. We also report almost complete mortality of large sponges followed over 40 years. Given our warming global climate, similar system-wide changes are expected in the future. © 2013 Dayton et al.
JournalPLoS ONE
Date2013
Volume8
Issue2
ISSN19326203
SubjectsAnoxycalyx joubini, Antarctica, article, biomass, dying, environmental change, global climate, greenhouse effect, growth rate, iceberg, life history, nonhuman, phytoplankton, population dynamics, population growth, sponge (Porifera), trend study
NoteCited By (since 1996):4, Art. No.: e56939, Downloaded from: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0056939 (16 June 2014).

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