Oecologia

, Volume 158, Issue 4, pp 733–745

Reduced performance of native infauna following recruitment to a habitat-forming invasive marine alga

  • Paul E. Gribben
  • Jeffrey T. Wright
  • Wayne A. O’Connor
  • Martina A. Doblin
  • Bradley Eyre
  • Peter D. Steinberg
Global Change Ecology - Original Paper

DOI: 10.1007/s00442-008-1181-0

Cite this article as:
Gribben, P.E., Wright, J.T., O’Connor, W.A. et al. Oecologia (2009) 158: 733. doi:10.1007/s00442-008-1181-0

Abstract

Despite well-documented negative impacts of invasive species on native biota, evidence for the facilitation of native organisms, particularly by habitat-forming invasive species, is increasing. However, most of these studies are conducted at the population or community level, and we know little about the individual fitness consequences of recruitment to habitat-forming invasive species and, consequently, whether recruitment to these habitats is adaptive. We determined the consequences of recruitment to the invasive green alga Caulerpa taxifolia on the native soft-sediment bivalve Anadara trapezia and nearby unvegetated sediment. Initially, we documented the growth and survivorship of A. trapezia following a natural recruitment event, to which recruitment to C. taxifolia was very high. After 12 months, few clams remained in either habitat, and those that remained showed little growth. Experimental manipulations of recruits demonstrated that all performance measures (survivorship, growth and condition) were significantly reduced in C. taxifolia sediments compared to unvegetated sediments. Exploration of potential mechanisms responsible for the reduced performance in C. taxifolia sediments showed that water flow and water column dissolved oxygen (DO) were significantly reduced under the canopy of C. taxifolia and that sediment anoxia was significantly higher and sediment sulphides greater in C. taxifolia sediments. However, phytoplankton abundance (an indicator of food supply) was significantly higher in C. taxifolia sediments than in unvegetated ones. Our results demonstrate that recruitment of native species to habitat-forming invasive species can reduce growth, condition and survivorship and that studies conducted at the community level may lead to erroneous conclusions about the impacts of invaders and should include studies on life-history traits, particularly juveniles.

Keywords

Anadara trapezia Bivalve Caulerpa taxifolia Fitness Growth Invasion biology Juveniles Maladaptive Soft sediment Survivorship 

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Paul E. Gribben
    • 1
  • Jeffrey T. Wright
    • 2
  • Wayne A. O’Connor
    • 3
  • Martina A. Doblin
    • 1
  • Bradley Eyre
    • 4
  • Peter D. Steinberg
    • 5
  1. 1.Department of Environmental SciencesUniversity of TechnologySydneyAustralia
  2. 2.Institute for Conservation Biology and School of Biological SciencesUniversity of WollongongWollongongAustralia
  3. 3.NSW Department of Primary Industries Port Stephens Fisheries CentreTaylors BeachAustralia
  4. 4.School of Environmental Science and ManagementSouthern Cross UniversityLismoreAustralia
  5. 5.Centre for Marine Biofouling and Bio-Innovation and School of Biological, Earth and Environmental SciencesUniversity of New South WalesSydneyAustralia

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