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Marine Biology

, Volume 151, Issue 1, pp 135–145 | Cite as

Juvenile–adult associations in sea urchins (Strongylocentrotusfranciscanus and S. droebachiensis): protection from predation and hydrodynamics in S. franciscanus

  • Michael T. Nishizaki
  • Josef Daniel Ackerman
Research Article

Abstract

Juvenile red sea urchins, Strongylocentrotus franciscanus, aggregate under adult conspecifics, whereas sympatric juvenile green sea urchins, Strongylocentrotus droebachiensis, are typically more solitary and dispersed. Neither the potential advantage of juvenile sheltering nor the differences in post-settlement behavior between the two species has been demonstrated experimentally, but may be related to protection from predators and/or hydrodynamics. In predation experiments, juvenile vulnerability differed in the two species as the seastar Pycnopodia helianthoides consistently chose juvenile S. franciscanus over S. droebachiensis (100% vs. 0%). When associated with adults, juvenile mortality decreased dramatically in S. franciscanus (90% alone vs. 5% with adults), but very little in S. droebachiensis (85% vs. 75%). Not surprisingly, juvenile behavioral responses in the two species reflect this difference in vulnerability. Juvenile S. franciscanus sheltered under adults when predation risk was high, but not when risk was low (44% vs. 13%), whereas sheltering in S. droebachiensis was infrequent and not related to predation risk (7% for high risk versus 5% for low risk). From a hydrodynamic perspective, the presence of an adult led to the creation of a hydrodynamic refuge for juveniles, where average water velocities were reduced by > 60% around the adult urchin. Again, striking differences in sheltering rate were apparent in S. franciscanus (52% vs. 13% for high flow and low flow, respectively), but not S. droebachiensis (5% for high flow versus 4% for low flow). Sheltering behavior was also species-specific as juveniles did not shelter at high rates under adults of the opposite species (≤ 16%). A field survey confirmed these finding in that juvenile S. franciscanus abundance was associated with both adults and water motion (R2 = 0.80, P = 0.008, best-subsets regression). These results suggest that sheltering confers juvenile S. franciscanus with a degree of protection from predators and water motion, and that species-specific differences in this post-settlement behavior may be related to the differences in the protection afforded by adults.

Keywords

Hermit Crab Test Diameter Juvenile Abundance Early Juvenile Stage Strongylocentrotus Franciscanus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We acknowledge J. Grayson, J. Mortimor, and D. Johnson for their diving assistance in field study, BMSC Director, A. Spencer for providing facilities, Island Scallops for providing juvenile urchins, and several anonymous reviewers for commenting on the manuscript. Financial support was provided by the Pacific Urchin Harvester’s Association, West Coast Green Urchin Harvester’s Association, a WCUMBS graduate award to MTN and Fisheries Renewal BC and NSERC grants to JDA.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Michael T. Nishizaki
    • 1
    • 2
    • 3
  • Josef Daniel Ackerman
    • 1
    • 2
    • 4
  1. 1.Physical Ecology LaboratoryUniversity of Northern British ColumbiaPrince GeorgeCanada
  2. 2.Bamfield Marine Sciences CentreBamfieldCanada
  3. 3.Department of BiologyUniversity of WashingtonSeattleUSA
  4. 4.Department of Integrative Biology and Faculty of Environmental SciencesUniversity of GuelphGuelphCanada

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