EPSCoR - Alaska Adapting to Changing Environments

EPSCoR - Alaska Adapting to Changing Environments

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Evidence for the assimilation of ancient glacier organic carbon in a proglacial stream food web

We used natural abundance δ13C, δ15N, and Δ14C to compare trophic linkages between potential carbon sources (leaf litter, epilithic biofilm, and particulate organic matter) and consumers (aquatic macroinvertebrates and fish) in a nonglacial stream and two reaches of the heavily glaciated Herbert River. We tested the hypothesis that proglacial stream food webs are sustained by organic carbon released from glacial ecosystems. Carbon sources and consumers in the nonglacial stream had carbon isotope values that ranged from −30‰ to −25‰ for δ13C and from −14‰ to 53‰ for Δ14C reflecting a food web sustained mainly on contemporary primary production. In contrast, biofilm in the two glacial stream sites was highly Δ14C-depleted (−215‰ to 175‰) relative to the nonglacial stream consistent with the assimilation of ancient glacier organic carbon. IsoSource modeling showed that in upper Herbert River, macroinvertebrates (Δ14C = −171‰ to 22‰) and juvenile salmonids (Δ14C = −102‰ to 17‰) reflected a feeding history of both biofilm (∼ 56%) and leaf litter (∼ 40%). We estimate that in upper Herbert River on average 36% of the carbon incorporated into consumer biomass is derived from the glacier ecosystem. Thus, 14C-depleted glacial organic carbon was likely transferred to higher trophic levels through a feeding history of bacterial uptake of dissolved organic carbon and subsequent consumption of 14C-depleted biofilm by invertebrates and ultimately fish. Our findings show that the metazoan food web is sustained in part by glacial organic carbon such that future changes in glacial runoff could influence the stability and trophic structure of proglacial aquatic ecosystems.

Data and Resources

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    Website :: Publisher Website

    http://onlinelibrary.wiley.com/doi/10.1002/lno.10088/full

Status: Complete
Type: Project
Data Types: Report
Primary Contact
Pyare, Sanjay
Email: sanjay.pyare@uas.alaska.edu
Work: 907-796-6007
Primary Agency
EPSCoR - Alaska Adapting to Changing Environments
Type
Academic

Funding Agency
EPSCoR - Alaska Adapting to Changing Environments
Type
Academic

Other Agencies
National Science Foundation

ISO Topics
biota, inlandWaters

Geo-keywords
Southeast

Collection
Southeast Test Case

Direct Record Link
http://southeast.epscor.alaska.edu/catalogs/11694-evidence-for-the-assimilation-of-ancient-glacie
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2016-09-12 15:07:22 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Published by Lisa
    2016-09-12 14:32:22 -0800
  • 01c8ceef3d596f40f05bf496ca00d929
    Updated by Lisa
    2016-09-12 14:32:13 -0800
  • 470f70ddabc3d336a04110c5468ab053
    New record created
    2016-09-09 10:48:37 -0800
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