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The study of past sedimentary records from coastal margins allows\udus to reconstruct variations in terrestrial input into the marine realm and\udto gain insight into continental climatic variability. There are numerous\udorganic proxies for tracing terrestrial input into marine environments but\udnone that strictly reflect the input of river-produced organic matter. Here,\udwe test the fractional abundance of the C32 alkane 1,15-diol relative to\udall 1,13- and 1,15-long-chain diols (FC32 1, 15) as a tracer of\udinput of river-produced organic matter in the marine realm in surface and\udQuaternary (0–45 ka) sediments on the shelf off the Zambezi and nearby\udsmaller rivers in the Mozambique Channel (western Indian Ocean). A Quaternary\ud(0–22 ka) sediment record off the Nile River mouth in the eastern\udMediterranean was also studied for long-chain diols. For the Mozambique\udChannel, surface sediments of sites most proximal to Mozambique rivers showed\udthe highest F1, 15 − C32 (up to 10 %). The sedimentary record shows\udhigh (15–35 %) pre-Holocene F1, 15 − C32 and low (< 10 %)\udHolocene F1, 15 − C32 values, with a major decrease between 18 and 12 ka.\udF1, 15 − C32 is significantly correlated (r2 =  0.83,\udp < 0.001) with the branched and isoprenoid tetraether (BIT)\udindex, a proxy for the input of soil and river-produced organic matter in the\udmarine environment, which declines from 0.25 to 0.60 for the pre-Holocene to\ud< 0.10 for the Holocene. This decrease in both FC32 1, 15 and the BIT is interpreted to be mainly due to rising sea level, which\udcaused the Zambezi River mouth to become more distal to our study site,\udthereby decreasing riverine input at the core location. Some small\uddiscrepancies are observed between the records of the BIT index and\udFC32 1, 15 for Heinrich Event 1 (H1) and the Younger Dryas (YD),\udwhich may be explained by a change in soil sources in the catchment area\udrather than a change in river influx. Like for the Mozambique Channel, a\udsignificant correlation between FC32 1, 15 and the BIT index\ud(r2 =  0.38, p < 0.001) is observed for the eastern\udMediterranean Nile record. Here also, the BIT index and FC32 1, 15 are lower in the Holocene than in the pre-Holocene, which is likely\uddue to the sea level rise. In general, the differences between the BIT index\udand FC32 1, 15 eastern Mediterranean Nile records can be\udexplained by the fact that the BIT index is not only affected by riverine\udrunoff but also by vegetation cover with increasing cover leading to lower\udsoil erosion. Our results confirm that FC32 1, 15 is a\udcomplementary proxy for tracing riverine input of organic matter into marine\udshelf settings, and, in comparison with other proxies, it seems not to be\udaffected by soil and vegetation changes in the catchment area

The C&lt;sub&gt;32&lt;/sub&gt; alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins

The C<sub>32</sub> alkane-1,15-diol as a proxy of late Quaternary riverine input in coastal margins