Marine Biology

, 165:184 | Cite as

Nest building by a small mesograzer limits blade size of the giant kelp Macrocystis pyrifera

  • Alistair G. B. PooreEmail author
  • Lars Gutow
  • Anne-Nina Lörz
  • Martin Thiel
Original paper


Small herbivores are abundant on large marine macrophytes, but their impact on their hosts is poorly understood relative to large grazers such as urchins and fish. To limit the risks of predation, many marine mesograzers live within nests or burrows, potentially causing more damage to plants than predicted from consumption alone. To test whether the growth of large primary producers can be affected by modification of plant structures by small herbivores, we quantified the effect of the nest-building amphipod Pseudopleonexes lessoniae on blades of the giant kelp, Macrocystis pyrifera in New Zealand. Amphipods create their nests by rolling the blade margin in close proximity to the meristem. Blades with nests were 40% shorter than blades lacking nests and reduced in area by 55%. We examined the composition of amphipods inhabiting each nest to assess the temporal persistence of grazer aggregations. Nests were occupied by a single female or male–female pairs, and their newly hatched offspring. Analysis of offspring size distributions suggested that offspring dispersed from the maternal nest and did not remain to breed themselves. By concentrating physical damage and feeding on valuable tissues, these results indicate that even low numbers of small herbivores can cause localized impacts on the morphology and size of fast-growing algal blades. Predicting the consequences of this damage on larger scales will require understanding the spatial and temporal distribution of amphipod nests on giant kelp.



We are very grateful to R. Taylor who hosted MT during measurements of amphipods at Leigh Marine Lab, and to V. Villalobos for help with image analysis. The NIWA Invertebrate Collection team is thanked for curation of the amphipod material. We thank P. Gagnon, S. Hamilton and one anonymous reviewer for comments that have improved this manuscript.

Author contributions

MT conceived the study. MT and AL conducted the field sampling and laboratory measurements. AP analysed the data and led the writing of the manuscript.


Data evaluation and manuscript writing were done during a research stay by LG (financed by AWI) and AP (with funding support from FONDECYT Grant 1161383).

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflicts of interest.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Supplementary material

227_2018_3444_MOESM1_ESM.pdf (889 kb)
Supplementary material 1 (PDF 890 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Evolution and Ecology Research Centre, School of Biological, Earth and Environmental SciencesUniversity of New South WalesSydneyAustralia
  2. 2.Alfred Wegener Institute Helmholtz Centre for Polar and Marine ResearchBremerhavenGermany
  3. 3.CeNak, Zoological Institute and Museum, University of HamburgHamburgGermany
  4. 4.Facultad de Ciencias del Mar, Universidad Católica del NorteCoquimboChile
  5. 5.Millennium Nucleus Ecology and Sustainable Management of Oceanic Island (ESMOI)CoquimboChile
  6. 6.Centro de Estudios Avanzados en Zonas Áridas (CEAZA)CoquimboChile

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