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Marine Biology

, Volume 159, Issue 1, pp 141–149 | Cite as

Herbivorous amphipods inhabit protective microhabitats within thalli of giant kelp Macrocystis pyrifera

  • Lars Gutow
  • Jeremy D. Long
  • Osvaldo Cerda
  • Ivan A. Hinojosa
  • Eva Rothäusler
  • Fadia Tala
  • Martin Thiel
Original Paper

Abstract

Many small marine herbivores utilize specific algal hosts, but the ultimate factors that shape host selection are not well understood. For example, the use of particular microhabitats within algal hosts and the functional role of these microhabitats have received little attention, especially in large algae such as kelps. We studied microhabitat use of the herbivorous amphipod Peramphithoe femorata that inhabits nest-like domiciles on the blades of giant kelp Macrocystis pyrifera. The vertical position of nest-bearing blades along the stipe of the algal thallus and the position of the nests within the lateral blades of M. pyrifera were surveyed in two kelp forests in northern-central Chile. Additionally, we conducted laboratory and field experiments to unravel the mechanisms driving the observed distributions. Peramphithoe femorata nests were predominantly built on the distal blade tips in apical sections of the stipes. Within-blade and within-stipe feeding preferences of P. femorata did not explain the amphipod distribution. Amphipods did not consistently select distal over proximal blade sections in habitat choice experiments. Mortality of tethered amphipods without nests was higher at the seafloor than at the sea surface in the field. Nests mitigated mortality of tethered amphipods, especially at the seafloor. Thus, protective microhabitats within thalli of large kelp species can substantially enhance survival of small marine herbivores. Our results suggest that differential survival from predation might be more important than food preferences in determining the microhabitat distribution of these herbivores.

Keywords

Kelp Forest Apical Section Algal Host Stipe Length Basal Blade 
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 are once more very thankful to Carolina and Pedro Correa for their hospitality during our stay in Los Vilos. This study was financed through FONDECYT 1060127 and 7070121.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Lars Gutow
    • 1
  • Jeremy D. Long
    • 2
  • Osvaldo Cerda
    • 3
  • Ivan A. Hinojosa
    • 3
  • Eva Rothäusler
    • 3
  • Fadia Tala
    • 3
  • Martin Thiel
    • 3
    • 4
  1. 1.Alfred Wegener Institute for Polar and Marine ResearchBremerhavenGermany
  2. 2.Biology DepartmentSan Diego State UniversitySan DiegoUSA
  3. 3.Facultad Ciencias del MarUniversidad Católica del NorteCoquimboChile
  4. 4.Centro de Estudios Avanzados en Zonas Áridas (CEAZA)CoquimboChile

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