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 F??Rber Lorda, Jaime en_US
dc.contributor.author Fowler, Scott en_US
dc.contributor.author Miquel, Juan-Carlos en_US
dc.contributor.author Rodriguez Y Baena, Alessia en_US
dc.contributor.author Jeffree, Ross en_US
dc.contributor.editor en_US
dc.date.accessioned 2014-04-14T02:36:09Z
dc.date.available 2014-04-14T02:36:09Z
dc.date.issued 2013 en_US
dc.identifier 2011005940 en_US
dc.identifier.citation F??Rber Lorda, Jaime et al. 2013, '210Po/210Pb dynamics in relation to zooplankton biomass and trophic conditions during an annual cycle in northwestern Mediterranean coastal waters', Journal of Environmental Radioactivity, vol. 115, no. 1, pp. 43-52. en_US
dc.identifier.issn 0265-931X en_US
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 a??blooma? was observed which was preceded by a prolonged increase in POM (protein ?? carbohydrates ?? 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 kg 1 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 m 3) measured in these coastal waters, biomass levels which commonly occur in open ocean oligotrophic regions. en_US
dc.language en_US
dc.publisher Elsevier B.V. en_US
dc.relation.isbasedon en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.jenvrad.2012.07.003 en_US
dc.title 210Po/210Pb dynamics in relation to zooplankton biomass and trophic conditions during an annual cycle in northwestern Mediterranean coastal waters en_US
dc.parent Journal of Environmental Radioactivity en_US
dc.journal.volume 115 en_US
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 039900 en_US
dc.personcode 0000082209 en_US
dc.personcode 0000069182 en_US
dc.personcode 0000082210 en_US
dc.personcode 0000082211 en_US
dc.personcode 110409 en_US
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 en_US
dc.staffid 110409 en_US

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