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Marine Biology

, Volume 149, Issue 3, pp 455–463 | Cite as

Herbivory in the gammarid amphipod Aora typica: relationships between consumption rates, performance and abundance across ten seaweed species

  • Richard B. Taylor
  • Pam J. Brown
Research Article

Abstract

This paper reveals a substantial capacity for herbivory of seaweeds in the gammarid amphipod Aora typica, adults eating seven of ten taxonomically and morphologically diverse seaweed species offered to them in a no-choice assay. The green algae Ulva spathulata and Enteromorpha intestinalis were consumed at the highest rates in both no-choice (2.3–2.5 mg blotted weight individual−1 day−1) and multiple-choice assays (0.5–1.3 mg blotted weight individual−1 day−1). Adult A. typica collected from two different species of brown seaweeds had very similar feeding preferences to each other. Juvenile A. typica grew to reproductive maturity on the green algae E. intestinalis and U. spathulata, and the brown algae Carpophyllum maschalocarpum and Ecklonia radiata. In common with previous studies on members of other amphipod families, survivorship of juvenile amphipods was positively correlated with feeding preferences of adults across seaweed species (r2=0.43, P=0.04). However, densities of A. typica on seaweeds in the field (excluding the intertidal E. intestinalis and U. spathulata) were not significantly correlated with feeding preferences of adults (r2=0.07, P=0.5) or survivorship of juveniles (r2=0.17, P=0.31). This suggests that either host seaweeds are not a major dietary component of these amphipods in nature, or that the host’s value as a food source is overridden by other properties such as the degree of shelter it affords from larger consumers. This study provides the first demonstration that a member of the cosmopolitan amphipod family Aoridae is capable of consuming a diverse range of seaweeds.

Keywords

Ulva Seaweed Species Cool White Fluorescent Lighting Feeding Assay Intertidal Seaweed 
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

Acknowledgements

This research was supported by a University of Auckland Early Career Research Excellence Award to R. Taylor. We thank N. Barr for sharing his observations, and L. Zemke-White for collecting Ulva pertusa from the Mokohinau Islands. Ulva pertusa was identified by L. McIvor. Thanks also to A. Poore for initially alerting us to the capacity of Aora spp. to consume seaweeds, and M. Costello and an anonymous reviewer for their constructive criticism of the manuscript. The experiments comply with the current laws of New Zealand.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Leigh Marine LaboratoryUniversity of AucklandWarkworthNew Zealand

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