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RESEARCH ARTICLE
Contents Vol 57(7)

Limited grazing pressure by native herbivores on the invasive seaweed Caulerpa taxifolia in a temperate Australian estuary

John R. Gollan A B C and Jeffrey T. Wright A
+ Author Affiliations
- Author Affiliations

A Institute for Conservation Biology and Department Biological Science, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.

B Present address: Australian Museum, College Street, Sydney, NSW 2010, Australia.

C Corresponding author. Email: johng@austmus.gov.au

Marine and Freshwater Research 57(7) 685-694 https://doi.org/10.1071/MF05253
Submitted: 19 December 2005  Accepted: 2 August 2006   Published: 13 October 2006

Abstract

Caulerpa taxifolia is an invasive alga threatening biodiversity in invaded regions. Its proliferation in recipient communities will be due to several factors including limited grazing effects by native herbivores. However, little is known about grazing pressure exerted by native herbivores on C. taxifolia relative to native macrophytes or its attractiveness to them as habitat. The present study determined which herbivores co-occurred with invasive C. taxifolia in a temperate Australian estuary and documented their abundance, relative grazing effects, habitat preference and survivorship on C. taxifolia compared with native macrophytes. Four herbivores co-occurred with C. taxifolia and their densities were often low or zero at the sites studied. Feeding experiments showed that compared with C. taxifolia: the fish, Girella tricuspidata, preferred Ulva sp.; the sea-hare, Aplysia dactylomela, preferred Laurencia sp.; whereas the mesograzers, Cymadusa setosa and Platynereis dumerilii antipoda, both consumed Cystoseira trinodus and Sargassum sp. at higher rates. The two mesograzers also showed strong habitat preference for C. trinodus and Sargassum sp. Cymadusa setosa had poor survivorship on Caulerpa taxifolia whereas P. dumerilii antipoda had 100% survivorship on C. taxifolia after 41 days. We consider that the low diversity and abundance of native herbivores, their weak grazing pressure on C. taxifolia and its low attractiveness as habitat may facilitate further local spread in this estuary, and potentially in other invaded locations.

Extra keywords: enemy-release, exotic, generalist, herbivory, Lake Conjola, New South Wales.


Acknowledgments

We would like to thank P. B. Barnes, E. J. West, M. L. Brien and L. E. Pettifer for their help in the field. A. G. B. Poore and two anonymous reviewers provided helpful comments on earlier drafts. Also thanks to Dr A. Murray at the Australian Museum for identifying mesograzers. This is contribution no. 272 from the Ecology and Genetics Group of the University of Wollongong.


References

Adolph, S. , Jung, V. , Rattke, J. , and Pohnert, G. (2005). Wound closure in the invasive green alga Caulerpa taxifolia by enzymatic activation of a protein cross-linker. Angewandte Chemie International Edition 44, 2806–2808.
| Crossref | GoogleScholarGoogle Scholar | Creese R. G., Davis A. R., and Glasby T. (2004). Eradicating and preventing the spread of the invasive alga Caulerpa taxifolia in NSW. NSW Fisheries Final Report Series No. 64, p. 110. NSW Fisheries: Sydney.

Davis, A. R. , Benkendorff, K. , and Ward, D. W. (2005). Responses of common SE Australian herbivores to three suspected invasive Caulerpa spp. Marine Biology 146, 859–868.
| Crossref | GoogleScholarGoogle Scholar | Duffy J. E., and Hay M. E. (2001). The ecology and evolution of marine consumer-prey interactions. In ‘Marine Community Ecology’. (Eds M. D. Bertness, S. D. Gaines and M. E. Hay.) pp. 131–157. (Sinauar Associates: Sunderland, MA.)

Francour, P. , Harmelin-Vivien, M. , Harmelin, J. G. , and Duclerc, J. (1995). Impact of Caulerpa taxifolia colonization on the littoral ichthyofauna of north-western Mediterranean Sea: Preliminary results. Hydrobiologia 300–301, 345–353.
| Crossref | GoogleScholarGoogle Scholar | Hay M. E., and Steinberg P. D. (1992). The chemical ecology of plant-herbivore interactions in marine versus terrestrial communities. In ‘Herbivores: their Interaction with Secondary Plant Metabolites’. (Eds G. A. Rosenthal and M. R. Berenbaum.) pp. 371–413. (Academic Press Inc.: San Diego, CA.)

Hutchings, M. J. , Booth, K. D. , and Waite, S. (1991). Comparison of survivorship by log rank test: criticisms and alternatives. Ecology 72, 2290–2293.
| Crossref | GoogleScholarGoogle Scholar | Kingsford M. J. (1998). Reef fishes. In ‘Studying Temperate Marine Environments: A Handbook for Ecologists’. (Eds M. J. Kingsford and C. Battershill.) pp. 132–166. (Canturbury University Press: Christchurch.)

Lemee, R. , Pesando, D. , Issanchou, C. , and Amade, P. (1997). Microalgae: a model to investigate the ecotoxicity of the green alga Caulerpa taxifolia from the Mediterranean Sea. Marine Environmental Research 44, 13–25.
| Crossref | GoogleScholarGoogle Scholar | Schaffelke B., Smith J. E., and Hewitt C. L. (in press). Introduced macroalgae – a growing concern. In ‘Proceedings of the 18th International Seaweed Symposium, Bergen, Norway’. (International Seaweed Association.)

Scheibling, R. E. , and Anthony, S. X. (2001). Feeding, growth and reproduction of sea urchins (Strongylocentrotus droebachiensis) on single and mixed diets of kelp (Laminaria spp.) and the invasive alga Codium fragile ssp. tomentosoides. Marine Biology 139, 139–146.
| Crossref | GoogleScholarGoogle Scholar | Steinberg P. D. (1992). Geographical variation in the interaction between marine herbivores and brown algal secondary metabolites. In ‘Ecological Roles for Marine Secondary Metabolites'. (Ed. V. J. Paul.) pp. 51–92. (Cornell University Press: New York.)

Strauss, R. E. (1979). Reliability estimates for Ivlev’s electivity index, the forage ratio, and a proposed linear index of food selection. Transactions of the American Fisheries Society 108, 344–352.
| Crossref | GoogleScholarGoogle Scholar | Underwood A. J. (1997). ‘Experiments in Ecology.’ (Cambridge University Press: Cambridge.)

Underwood, A. J. , Kingsford, M. J. , and Andrew, N. L. (1991). Patterns in shallow subtidal marine assemblages along the coast of New South Wales. Australian Journal of Ecology 6, 231–249.


Williams, S. I. , and Walker, D. I. (1999). Mesoherbivore-macroalgal interactions: feeding ecology of sacoglossan sea slugs (Mollusca, Opisthobranchia) and their effects on their food algae. Oceanography and Marine Biology: An Annual Review 37, 87–128.


Wright, J. T. (2005). Differences between native and invasive Caulerpa taxifolia: a link between asexual fragmentation and abundance in invasive populations. Marine Biology 147, 559–569.
| Crossref | GoogleScholarGoogle Scholar |

Wright, J. T. , and Steinberg, P. D. (2001). Effects of variable recruitment and post-recruitment herbivory on local population size of a marine alga. Ecology 82, 2200–2215.
| Crossref | GoogleScholarGoogle Scholar |

Wright, J. T. , de Nys, R. , and Steinberg, P. D. (2000). Geographic variation in halogenated furanones from the red alga Delisea pulchra and associated herbivores and epiphytes. Marine Ecology Progress Series 207, 227–241.


Zemke-White, W. , and Clements, K. D. (1999). Chlorophyte and rhodophyte starches as factors in diet choice by marine herbivorous fish. Journal of Experimental Marine Biology and Ecology 240, 137–149.
| Crossref | GoogleScholarGoogle Scholar |

Žuljevic, A. , Thibaut, T. , Elloukal, H. , and Meinesz, A. (2001). Sea slug disperses the invasive Caulerpa taxifolia. Journal of the Marine Biology Association of the UK 81, 343–344.