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tel-00009359, version 1 - 1 Jun 2005 Chapitre 3 - Fonctionnement du réseau trophique benthique de la Grande Vasière Table 5. Classification of sampling station means for sedimented particles in April-May and September 2002 (Newman and Keuls test, p
tel-00009359, version 1 - 1 Jun 2005 TPM flux (g.m -2 .h -1 ) 50 40 30 20 10 0 Chapitre 3 - Fonctionnement du réseau trophique benthique de la Grande Vasière spring summer F G A B C D E Stations Figure 5. Total Particulate Matter flux (TPM, g.m -2 .h -1 ) and Particulate Organic Carbon:Total Particulate Matter ratios in particulate matter collected in the bottom-moored sediment traps during spring (April 26 th to May3 rd ) and late summer (September 13 th -19 th ) sampling on the Bay of Biscay continental shelf. Stations are ranked according to an inshore-offshore gradient. The δ 13 C values in particles sedimented in the traps ranged from –22.74 (Stn D) to –20.00‰ (Stn A) in spring vs. –24.62 (Stn B) to –20.35‰ (Stn G) in late summer. Stations A and G showed carbon stable isotopic ratios similar to those of the inshore station (F) overall (Table 4), while the central ‘Grande Vasière’ stations B, C and D exhibited higher δ 13 C values (-22.71 ± 0.02‰ in spring and -24.60 ± 0.04‰ in late summer). The δ 13 C value of the offshore station (E) in September was close to the values recorded on the central ‘Grande Vasière’. The δ 15 N values ranged from 2.59 (Stn C) to 4.40‰ (Stn F) in spring vs. 2.07 (Stn A) to 4.63‰ (Stn F) in late summer. The central ‘Grande Vasière’ (3.46 ± 0.60‰) exhibited a 1‰ difference with the coastal zone in spring and a 1.5‰ difference in late summer (3.15 ± 0.99‰). POC flux (mg C.m -2 .h -1 ) 400 350 300 250 200 150 100 50 0 191 spring summer F G A B C D E Stations Figure 6. Particulate Organic Carbon flux (POC, mg C.m -2 .h -1 ) and Particulate Organic Carbon:Total Particulate Carbon ratios in particulate matter collected in the bottom-moored sediment traps during spring (April 26 th to May 3 rd ) and late summer (September 13 th -19 th ) sampling on the Bay of Biscay continental shelf. Stations are ranked according to an inshore-offshore gradient. 0 3 2 1 0 100 75 50 25 POC:TPM (%) POC:PTC (%)
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