Marine Biology

, Volume 144, Issue 3, pp 429–437 | Cite as

Wave exposure, swimming performance, and the structure of tropical and temperate reef fish assemblages

Research Article
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Abstract

We examined the relationship between swimming performance, wave exposure, and the distribution patterns of labrids on temperate rocky reefs, in comparison with previous functional analyses of a tropical assemblage. Visual censuses of the distribution and abundance of labrids across two major gradients of wave exposure (depth and aspect to prevailing winds) were made at two offshore islands near Port Stephens, New South Wales, Australia. Distinct shifts in species composition and abundance were evident between high and low wave exposure habitats on temperate rocky reefs, particularly between deep and shallow habitats on exposed reef fronts. The swimming performances of temperate labrids were assessed through examination of pectoral fin shape (aspect ratio) and in situ swimming speeds. A diversity of pectoral fin morphologies was exhibited within this temperate assemblage, ranging from rounded to tapered fins (aspect ratios of 0.52 and 1.43, respectively). Fin shape was strongly correlated (Pearson’s correlation 0.884, P<0.001) with swimming speed (ranging from 1.05 and 3.06 body lengths s−1), in a relationship comparable to that observed in tropical labrids. Inter-specific differences in swimming ability provided some explanation for differences in the distribution and abundance of temperate labrids in relation to wave exposure. However, our findings suggest that although coral reef labrids appear to predominantly use high aspect-ratio fins to successfully occupy wave-exposed habitats, temperate labrids appear to be using an enhanced swimming ability through increased body size.

Keywords

Swimming Speed Swimming Performance Wave Exposure Rocky Reef Reef Fish Assemblage 
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.
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Notes

Acknowledgements

We thank J. Ackerman, T. Fulton and A. Thomas for assistance in the field, and J. Simm for his generous contribution of time and logistical support in Port Stephens. We also thank J. Walker, P. Wainwright and M. Westneat for helpful discussions. Financial support was provided by the Australian Research Council and James Cook University. JCU Animal Experimentation Ethics approval no. A656-01. This is contribution no. 083 of the Centre for Coral Reef Biodiversity.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Centre for Coral Reef Biodiversity, Department of Marine BiologyJames Cook UniversityTownsvilleAustralia

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