Effects of limitation stress and of disruptive stress on induced antigrazing defense in the bladder wrack Fucus vesiculosus

Florian Weinberger*, Sven Rohde, Yvonne Oschmann, Laila Shahnaz, Sergey Dobretsov, Martin Wahl

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

We assessed the effects of light limitation and temperature shift on palatability and induced antiherbivore defense in the brown alga Fucus vesiculosus L. Incubation for 2 wk at light intensities above the compensation point of photosynthesis and in the absence of grazers increased the palatability of F. vesiculosus and its subsequent consumption by the omnivorous isopod Idotea baltica Pallas. This effect correlated with an increased C:N ratio and mannitol content in the algal tissue, presumably due to increased photosynthetic carbon fixation. Mannitol, the primary product of photosynthesis in F. vesiculosus, proved to be a feeding cue for I. baltica, and depletion of the mannitol pool may therefore account for the reduced palatability during light limitation. At light intensities above the compensation point of photosynthesis, F. vesiculosus responded with decreasing palatability when it was exposed to I. baltica grazing. Irrespective of the preceding light regime, such defense induction was prevented during incubation under light limitation. Thus, under low light, defense induction is not only inhibited, but also less necessary due to the relative absence of feeding cues. Upward or downward shifts in water temperature by approximately 10°C also inhibited inducible defense in F. vesiculosus. However, such shifts did not affect algal growth and were therefore the consequence of an impairment of specific defense-related components rather than of resource limitation, unless compensatory growth was given priority over defense.

Original languageEnglish
Pages (from-to)83-94
Number of pages12
JournalMarine Ecology Progress Series
Volume427
DOIs
Publication statusPublished - Apr 12 2011

Keywords

  • Alga-herbivore interaction
  • Defense induction
  • Idotea
  • Seaweed-herbivore interaction
  • Stress effects

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology
  • Ecology, Evolution, Behavior and Systematics

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