Marine Biology

, 165:74 | Cite as

Microherbivores are significant grazers on Palau’s forereefs

  • Noam T. Altman-Kurosaki
  • Mark A. Priest
  • Yimnang Golbuu
  • Peter J. Mumby
  • Alyssa MarshellEmail author
Original paper


Herbivory plays an important role in controlling benthic dynamics on coral reefs. The previous studies have highlighted the importance of grazing herbivorous fishes in removing algal turf biomass, but fewer studies have investigated the impact of invertebrate microherbivore grazing. This study examined the impact of microherbivore grazing in areas of high- and low-wave exposure on the forereefs of Palau, Micronesia, in June 2015. Experimental tiles were placed on open benthos, and in benthic and suspended herbivore exclusion cages at exposed and sheltered sites to partition the grazing impacts of microherbivores from fish grazers while examining the effect of exposure on algal turf productivity. Microherbivore grazing significantly impacted algal turf biomass, and this impact was greater in exposed sites than sheltered sites. Exposure did not significantly affect algal turf biomass on experimental tiles in the suspended exclusion cages. Surveys of microherbivore density revealed only Paguroidea (hermit crabs, especially of family Diogenidae) were more abundant at exposed sites than sheltered sites. Furthermore, tank trials of grazing rates showed diogenid hermit crabs removed over four times as much algal turf biomass as Columbellidae (marine gastropods), the second most abundant microherbivores. These results show that microherbivores are significant grazers on Palau’s forereefs, and may play an important role in maintaining reef resilience as reef health continues to decline worldwide. The significant role of invertebrate microherbivores in removing algal turf biomass should be investigated when considering the ecological role of herbivory on coral reefs.



The authors would like to thank the Princeton Environmental Institute’s Undergraduate Research fund for senior thesis research at Princeton University, the Mountlake Field Research Fund, and the Council on Science and Technology for financial support (grants to NAK). Additional funding was provided by the Australian Research Council’s Centre of Excellence for Coral Reef Studies (grant to PJM), the Australian Endeavour Award Postdoctoral Fellowship, and PADI Foundation Award (grants to AM) We also thank the Palau International Coral Reef Center for graciously hosting this study, Steve Lindfield for field assistance, Jessica Stella for help with invertebrate identification, and Stephen Pacala for additional guidance. We thank the reviewers for their comments, which improved our final manuscript.


Funding was provided by the Princeton Environmental Institute’s Undergraduate Research fund for senior thesis research at Princeton University, the Mountlake Field Research Fund, and the Council on Science and Technology (grants to NAK), as well as the Australian Research Council’s Centre of Excellence for Coral Reef Studies (grant to PJM), the Australian Endeavour Award Postdoctoral Fellowship, and PADI Foundation Award (grants to AM).

Compliance with ethical standards

Conflict of interest

The 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

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Supplementary material 1 (PDF 3933 kb)
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Supplementary material 2 (PDF 169 kb)
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Supplementary material 3 (PDF 78 kb)
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Supplementary material 4 (PDF 96 kb)


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Copyright information

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

Authors and Affiliations

  • Noam T. Altman-Kurosaki
    • 1
    • 2
    • 3
  • Mark A. Priest
    • 4
    • 5
  • Yimnang Golbuu
    • 4
  • Peter J. Mumby
    • 5
  • Alyssa Marshell
    • 5
    • 6
    Email author
  1. 1.Department of Ecology and Evolutionary BiologyPrinceton UniversityPrincetonUSA
  2. 2.Princeton Environmental InstitutePrinceton UniversityPrincetonUSA
  3. 3.Hawaii Institute of Marine BiologyUniversity of Hawaii at ManoaKaneoheUSA
  4. 4.Palau International Coral Reef CentreKororPalau
  5. 5.Marine Spatial Ecology Lab, Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological SciencesUniversity of QueenslandBrisbaneAustralia
  6. 6.Marine Ecology Lab Oman, Department of Marine Science and Fisheries, College of Agriculture and Marine ScienceSultan Qaboos UniversityMuscatOman

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