Abstract

English

Highlights

  • One of the key strengths of the Russian-US Long-term Census of the Arctic (RUSALCA) program in the Chukchi Sea is the capability to cross the international frontier between Russia and the United States and to assess the Chukchi Sea from an integrated ecosystem perspective

  • In this overview of selected results from the Russian American Long-term Census of the Arctic (RUSALCA) program, we focus on tying bacterial production and abundance in the water column to related processes in the sediments by presenting data on water column primary production, sediment oxygen respiration, and chlorophyll deposited to the sediments

  • Bacterial communities and processes are best understood in an environmental context, so we present data on the elemental and isotopic ratios of carbon and nitrogen in the sediments as indicators of regional-scale deposition and productivity processes, and data on the distribution of sediment characteristics such as sediment grain size and the total organic content of surface sediments

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Summary

Introduction

One of the key strengths of the Russian-US Long-term Census of the Arctic (RUSALCA) program in the Chukchi Sea is the capability to cross the international frontier between Russia and the United States and to assess the Chukchi Sea from an integrated ecosystem perspective Another strength is the capability to assess the relationship between water column and sediment processes on a shallow, productive, polar continental shelf where water column production affects the benthos and where sedimentary processes, including mineralization, can in turn influence water chemistry as waters flow across the shallow shelf and into the deep Arctic basin (e.g., Jones et al, 1998; Codispoti et al, 2005; Mathis et al, 2014). These environmental data are directly related to physical flow fields and deposition of organic materials to the biologically productive benthic microbial and macrofaunal communities on this polar continental shelf

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