Benthos as the basis for arctic lake food webs

Michael E. Sierszen, Michael E. McDonald, Douglas A. Jensen

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Plankton have traditionally been viewed as the basis for limnetic food webs, with zooplankton acting as a gateway for energy passing between phytoplanktonic primary producers and fish. Often, benthic production has been considered to be important primarily in shallow systems or as a subsidy to planktonic food web pathways. Stable isotope food web analyses of two arctic lakes (NE14 and I minus) in the Toolik Lake region of Alaska indicate that benthos are the primary source of carbon for adults of all species of benthic and pelagic fish present. We found no effect of turbidity, which may suppress benthic algae by shading, on food web structure. Even though Secchi transparency varied from 10.2 m in NE14 to 0.55-2.6 m in I minus, food webs in both lakes were based upon benthos, had four trophic levels, and culminated with omnivorous lake trout. We suggest that the importance of benthos in the food webs of these lakes is due to their extreme oligotrophy, resulting in planktonic resources that are insufficient for the support of planktivorous consumers.

Original languageEnglish (US)
Pages (from-to)437-445
Number of pages9
JournalAquatic Ecology
Volume37
Issue number4
DOIs
StatePublished - Oct 1 2003

Fingerprint

benthic organisms
food webs
benthos
food web
Arctic region
lakes
lake
algae
Salvelinus namaycush
pelagic fish
subsidies
shading
transparency
turbidity
trophic level
stable isotopes
plankton
shade
zooplankton
stable isotope

Keywords

  • Food webs
  • Oligotrophy
  • Stable isotopes
  • Trophic structure

Cite this

Benthos as the basis for arctic lake food webs. / Sierszen, Michael E.; McDonald, Michael E.; Jensen, Douglas A.

In: Aquatic Ecology, Vol. 37, No. 4, 01.10.2003, p. 437-445.

Research output: Contribution to journalArticle

Sierszen, Michael E. ; McDonald, Michael E. ; Jensen, Douglas A. / Benthos as the basis for arctic lake food webs. In: Aquatic Ecology. 2003 ; Vol. 37, No. 4. pp. 437-445.
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