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Oecologia

, Volume 191, Issue 4, pp 945–956 | Cite as

Predator identity dominates non-consumptive effects in a disease-impacted rocky shore food web

  • Kindall A. MurieEmail author
  • Paul E. Bourdeau
Community ecology – original research

Abstract

Predicting the effects of predator diversity loss on food webs is challenging, because predators can both consume and induce behavioral responses in their prey (i.e., non-consumptive effects or NCEs). Studies manipulating predator diversity and investigating NCEs are rare, especially in marine systems. Recently, a severe outbreak of sea star wasting syndrome (SSWS) on the west coast of North America resulted in unprecedented declines of the sea star Pisaster ochraceus. We investigated the consequences of Pisaster loss on an abundant grazer, the black turban snail Tegula funebralis, through NCEs. We combined a laboratory experiment and field surveys to examine the importance of identity vs. diversity in a predator assemblage (Pisaster, crabs, and octopuses) on Tegula behavior, feeding, and growth. Laboratory and field results indicated that predator identity, not diversity, drives Tegula behavior and causes NCEs. Mesocosm treatments with Pisaster caused greater NCEs on Tegula than assemblages without Pisaster. Tegula’s distribution in the field, which is driven primarily by anti-predator behavior, was strongly associated only with Pisaster abundance, and not with the abundance of crabs, octopuses, and other predatory sea stars (Leptasterias spp.). We conclude that Pisaster primarily drives Tegula vertical distribution and may be having strong NCEs on Tegula on northern California rocky shores. Furthermore, predator diversity in northern California does not provide functional redundancy, in terms of NCEs on Tegula, to buffer the system from Pisaster loss. Thus, predator-induced vertical distributions and grazing suppression may not be maintained in areas where Pisaster populations are reduced or slow to recover from SSWS.

Keywords

Anti-predator behavior Intertidal zonation Keystone intimidator Multiple predators Predator–prey interactions Sea star wasting syndrome TMIIs Trophic cascade 

Notes

Acknowledgements

We thank the director and staff at TML for logistical support, and T. Burns, T. Flagor, J. Gravelle, L. McIntire, and R. Vadas-Williams for help with the experiment. S. Morgan, D. Burkepile, and three anonymous reviewers provided constructive criticism on the manuscript. Organisms were collected under CDFW SCP #10571. Funding was provided by an Oliphant Scholarship and a Humboldt MSCI Undergraduate Student Research Award to KAM. PEB acknowledges support from CSU-COAST. This is a contribution of Humboldt State University’s Telonicher Marine Laboratory and the Humboldt Marine and Coastal Sciences Institute.

Author contribution statement

KAM and PEB conceived the project. KAM collected and analyzed the data. KAM and PEB wrote the manuscript.

Supplementary material

442_2019_4548_MOESM1_ESM.docx (162 kb)
Supplementary material 1 (DOCX 162 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Telonicher Marine LaboratoryHumboldt State UniversityTrinidadUSA
  2. 2.Department of Biological SciencesHumboldt State UniversityArcataUSA

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