Oecologia

, Volume 156, Issue 3, pp 671–680

Effects of environmental stress on intertidal mussels and their sea star predators

  • Laura E. Petes
  • Morgan E. Mouchka
  • Ruth H. Milston-Clements
  • Tracey S. Momoda
  • Bruce A. Menge
Community Ecology - Original Paper

DOI: 10.1007/s00442-008-1018-x

Cite this article as:
Petes, L.E., Mouchka, M.E., Milston-Clements, R.H. et al. Oecologia (2008) 156: 671. doi:10.1007/s00442-008-1018-x

Abstract

Consumer stress models of ecological theory predict that predators are more susceptible to stress than their prey. Intertidal mussels, Mytilus californianus, span a vertical stress gradient from the low zone (lower stress) to the high zone (higher thermal and desiccation stress), while their sea star predators, Pisaster ochraceus, range from the low zone only into the lower edge of the mussel zone. In summer 2003, we tested the responses of sea stars and mussels to environmental stress in an experiment conducted on the Oregon coast. Mussels were transplanted from the middle of the mussel bed to cages in the low and high edges of the mussel bed. Sea star predators were added to half of the mussel cages. Mussels and sea stars were sampled between June and August for indicators of sublethal stress. Mussel growth was measured, and tissues were collected for heat shock protein (Hsp70) analyses and histological analyses of reproduction. Sea stars were weighed, and tissues were sampled for Hsp70 analyses. Mussels in high-edge cages had higher levels of total Hsp70 and exhibited spawning activity earlier in the summer than mussels in the low-edge cages. Sea stars suffered high mortality in the high edge, and low-edge sea stars lost weight but showed no differences in Hsp70 production. These results suggest that stress in the intertidal zone affected the mobile predator more than its sessile prey, which is consistent with predictions of consumer stress models.

Keywords

Heat shock proteins Mytilus californianus Pisaster ochraceus 

Supplementary material

442_2008_1018_MOESM1_ESM.doc (1 mb)
Western blot analyses of heat shock proteins from a. mussels (Mytilus californianus) and b. sea stars (Pisaster ochraceus). The developed blots were exposed to X-ray film for 30 s. Left-most lane represents Hsc70 standard. The other eight lanes represent individual samples. (DOC 1027 kb)

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Laura E. Petes
    • 1
    • 4
  • Morgan E. Mouchka
    • 2
  • Ruth H. Milston-Clements
    • 1
  • Tracey S. Momoda
    • 3
  • Bruce A. Menge
    • 1
  1. 1.Department of ZoologyOregon State UniversityCorvallisUSA
  2. 2.Department of Ecology and Evolutionary BiologyCornell UniversityIthacaUSA
  3. 3.Department of Fisheries and WildlifeOregon State UniversityCorvallisUSA
  4. 4.Florida State University Coastal and Marine LaboratorySt. TeresaUSA

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