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Skeletal molybdenum/calcium ([Mo]/[Ca])shell ratios were examined inshells of the Great Scallop Pecten maximus collected in temperate coastal environments ofWestern Europe (42 to 49° N). These ratios were determined byquantitative LA-ICP-MS analyses of daily striae taken every third day (i.e.a temporal resolution of 3 days) in 36 flat valves (2-years old; 3shells/year). Variations of ([Mo]/[Ca])shell ratios were significantand reproducible for scallops from the same population, from different years(1998–2004) and temperate coastal locations (NW France). The[Mo]/[Ca])shell ratios exhibit typical profiles characterized by abackground content, below the detection limit for this method(<0.003 μmol/mol) for most of the shell growth period, which is punctuated by asignificant transient enrichment (0.031–2.1 μmol/mol) mainly occurringfrom May to June. The Bay of Brest (France) was investigated in particularbecause of its long term observations on scallop communities, environmentalvariables, and high resolution analyses of dissolved Mo in bottom seawaterin 2000. In 2000, dissolved Mo exhibited a significant increase inconcentration just preceding the maximum ([Mo]/[Ca])shell ratio. Boththe intense monitoring survey in 2000 and over the 7-year period indicatesthat the ([Mo]/[Ca])shell maximum is directly influenced by springchanges of environmental conditions at the sediment water interface (SWI),occurring subsequent to the intense and periodic spring bloom. Spring maximaof ([Mo]/[Ca])shell ratios are closely correlated to the extent ofsilicic acid and nitrate depletion in seawater between winter and latespring (r2=0.878 and 0.780, p<0.05, n=6) that reflects diatomuptake and productivity in the Bay of Brest. The Mo inputs in bottom watersand subsequent shell enrichment are thus suggested to be directly orindirectly influenced by such biogenic material input at the SWI. The[Mo]/[Ca])shell records thus reveal unexpected biogeochemical cycles ofMo influenced by coastal spring productivity, faithfully recorded in scallopshells

Spring molybdenum enrichment in scallop shells: a potential tracer of diatom productivity in temperate coastal environments (Brittany, NW France)