Spring feeding by pink-footed geese reduces carbon stocks and sink strength in tundra ecosystems

Rene Van Der Wal, Sofie Sjogersten, Sarah Jane Woodin, Elisabeth J. Cooper, Ingibjorg S. Jonsdottir, Dries Kuijper, Tony A. D. Fox, A. D. Huiskes

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Tundra ecosystems are widely recognized as precious areas and globally important carbon (C) sinks, yet our understanding of potential threats to these habitats and their large soil C store is limited. Land-use changes and conservation measures in temperate regions have led to a dramatic expansion of arctic-breeding geese, making them important herbivores of high-latitude systems. In field experiments conducted in high-Arctic Spitsbergen, Svalbard, we demonstrate that a brief period of early season below-ground foraging by pink-footed geese is sufficient to strongly reduce C sink strength and soil C stocks of arctic tundra. Mechanisms are suggested whereby vegetation disruption due to repeated use of grubbed areas opens the soil organic layer to erosion and will thus lead to progressive C loss. Our study shows, for the first time, that increases in goose abundance through land-use change and conservation measures in temperate climes can dramatically affect the C balance of arctic tundra.

Original languageEnglish
Pages (from-to)539-545
Number of pages7
JournalGlobal Change Biology
Volume13
Issue number2
Early online date6 Dec 2006
DOIs
Publication statusPublished - Feb 2007

Keywords

  • belowground herbivory
  • C sink
  • C source
  • ecosystem respiration
  • goose grubbing
  • high arctic
  • land-use change
  • net ecosystem exchange
  • Spitsbergen
  • arctic salt-marsh
  • abundance
  • components
  • herbivory
  • exchange
  • dynamics
  • dioxide
  • soil

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