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Foraminifera are an important component of ben- thic communities in oxygen-depleted settings, where they potentially play a significant role in the processing of organic matter. We tracked the uptake of a 13 C-labelled algal food source into individual fatty acids in the benthic foraminiferal species Uvigerina ex. gr. semiornata from the Arabian Sea oxygen minimum zone (OMZ). The tracer experiments were conducted on the Pakistan margin during the late/post mon- soon period (August-October 2003). A monoculture of the diatom Thalassiosira weisflogii was 13 C-labelled and used to simulate a pulse of phytoplankton in two complementary ex- periments. A lander system was used for in situ incubations at 140 m water depth and for 2.5 days in duration. Shipboard laboratory incubations of cores collected at 140 m incorpo- rated an oxystat system to maintain ambient dissolved oxy- gen concentrations and were terminated after 5 days. Uptake of diatoms was rapid, with a high incorporation of diatom fatty acids into foraminifera after 2 days in both experi- ments. Ingestion of the diatom food source was indicated by the increase over time in the quantity of diatom biomarker fatty acids in the foraminifera and by the high percentage of 13 C in many of the fatty acids present at the endpoint of both in situ and laboratory-based experiments. These results indi- cate that U. ex. gr. semiornata rapidly ingested the diatom food source and that these foraminifera will play an impor- tant role in the short-term cycling of organic matter within this OMZ environment. The presence of 18:1(n-7) in the ex- perimental foraminifera suggested that U. ex. gr. semiornata also consumed non-labelled bacterial food items. In addition, levels of 20:4(n-6), a PUFA only present in low amounts in the diatom food, increased dramatically in the foraminifera during both the in situ and shipboard experiments, possi- bly because it was synthesised de novo. This "essential fatty acid" is often abundant in benthic fauna, yet its origins and

biogeosciences

Uptake of algal carbon and the likely synthesis of an &amp;quot;essential&amp;quot; fatty acid by &amp;lt;i&amp;gt;Uvigerina&amp;lt;/i&amp;gt; ex. gr. &amp;lt;i&amp;gt;semiornata&amp;lt;/i&amp;gt; (Foraminifera) within the Pakistan margin oxygen minimum zone: evidence from fatty acid biomarker and &amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C tracer experiments