210Po/210Pb dynamics in relation to zooplankton biomass and trophic conditions during an annual cycle in northwestern Mediterranean coastal waters

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dc.contributor.author Färber Lorda, J
dc.contributor.author Fowler, SW
dc.contributor.author Miquel, J
dc.contributor.author Rodriguez y Baena, A
dc.contributor.author Jeffree, R
dc.date.accessioned 2014-04-14T02:36:09Z
dc.date.issued 2013-01
dc.identifier.citation Journal of Environmental Radioactivity, 2013, 115 (1), pp. 43 - 52
dc.identifier.issn 0265-931X
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/26074
dc.description.abstract Monthly sampling in northwestern Mediterranean coastal waters was undertaken to better understand the relationship between zooplankton biomass and the cycling of the natural radionuclide 210Po/210Pb pair during a one-year period (October 1995eNovember 1996). In conjunction with mesozooplankton collections and 210Po/210Pb measurements in seawater, zooplankton and their fecal pellets, the biochemical composition of particulate organic matter (POM) was also examined at three depths (0, 20 and 50 m) as an indicator of trophic conditions. During May 1996, a strong zooplankton âbloomâ was observed which was preceded by a prolonged increase in POM (protein þ carbohydrates þ lipids) starting at the end of March, and further demonstrated by a concomitant increase in the concentration of smaller particles, two features that are typical of mesotrophic waters. Simultaneous measurements of 210Po in sea water and zooplankton showed an inverse trend between these two parameters during the sampling period, with the two lowest 210Po concentrations in the dissolved phase of seawater coincident with the highest radionuclide concentrations in the zooplankton; however, this apparent relationship was not statistically significant over the entire year. Freshly excreted mesozooplankton and salp fecal pellets, which have been strongly implicated in the removal and downward transport of these radionuclides from the upper water column, contained 210Po and 210Pb levels ranging from 175 to 878 and 7.5 e486 Bq kg1 dry weight, respectively. Salp pellets contained 5 and 10 times more 210Po and 210Pb than in fecal pellets produced by mixed zooplankton, a finding most likely related to their different feeding strategies. During the zooplankton biomass peak observed in May, the 210Po concentration in zooplankton was at a minimum; however, in contrast to what has been reported to occur in some open sea oligotrophic waters, over the year no statistically significant inverse relationship was found between zooplankton biomass and 210Po concentration in zooplankton. This observation may have resulted from the general lack of very low biomass concentrations (<1 mg m3) measured in these coastal waters, biomass levels which commonly occur in open ocean oligotrophic regions.
dc.publisher Elsevier B.V.
dc.relation.isbasedon 10.1016/j.jenvrad.2012.07.003
dc.title 210Po/210Pb dynamics in relation to zooplankton biomass and trophic conditions during an annual cycle in northwestern Mediterranean coastal waters
dc.type Journal Article
dc.parent Journal of Environmental Radioactivity
dc.journal.volume 1
dc.journal.volume 115
dc.journal.number 1 en_US
dc.publocation Netherlands en_US
dc.identifier.startpage 43 en_US
dc.identifier.endpage 52 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.for 0502 Environmental Science and Management
dc.for 0399 Other Chemical Sciences
dc.personcode 110409
dc.percentage 34 en_US
dc.classification.name Other Chemical Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Radionuclide 210Po 210Pb Zooplankton Particulate matter Fecal pellets
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)

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