Habitat preference of three common fishes for seagrass, Caulerpa taxifolia, and unvegetated substrate in Moreton Bay, Australia

Abstract

A decrease in seagrass cover and a commensurate increase in Caulerpa taxifolia distribution in Moreton Bay have prompted concern for the impact that habitat change may have on faunal communities. Therefore, it is important to understand the patterns of habitat use. We examined habitat selection of three common seagrass species: double-ended pipefish (Syngnathoides biaculeatus), eastern trumpeter (Pelates quadrilineatus), and fan-bellied leatherjacket (Monacanthus chinensis) using a mesocosm experiment. Fish were given three possible habitat pairings (1) seagrass and C. taxifolia, (2) seagrass and unvegetated, and (3) C. taxifolia and unvegetated. Observation trials were conducted during the day and night over two days. In all trials, fish preferred vegetated habitat (seagrass or C. taxifolia) over unvegetated habitat (sand). In seagrass and C. taxifolia trials, all species preferred seagrass significantly over C. taxifolia. Habitat use patterns did not differ between day and night trials. Caulerpa taxifolia provides a valuable structured habitat in the absence of seagrass; however, it is unclear if C. taxifolia meadows provide other resource benefits to fishes beyond that of shelter.

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Acknowledgements

We thank the staff of Moreton Bay Research Station for logistical support, M. Anzalone and the students of MARS 2005 for their assistance in animal collection and observation. We are grateful for the funding provided by the Moreton Bay Research Station Community Research Grant and the Tangalooma Research Foundation. We are also grateful to the anonymous reviewers who greatly improved earlier drafts of this manuscript.

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Correspondence to Dana D. Burfeind.

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Burfeind, D.D., Tibbetts, I.R. & Udy, J.W. Habitat preference of three common fishes for seagrass, Caulerpa taxifolia, and unvegetated substrate in Moreton Bay, Australia. Environ Biol Fish 84, 317–322 (2009). https://doi.org/10.1007/s10641-009-9444-0

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Keywords

  • Caulerpa taxifolia
  • Habitat change
  • Habitat preference
  • Invasive species
  • Nursery habitat
  • Seagrass