Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum

Richard K. F. Unsworth, Samantha L. Garrard, Pelayo Salinas De Leon, Leanne C. Cullen, David J. Smith, Katherine A. Sloman, James J. Bell

Research output: Contribution to journalArticle

Abstract

Indo-Pacific mangrove swamps and seagrass beds are commonly located in close proximity to each other, often creating complex ecosystems linked by biological and physical processes. Although they are thought to provide important nursery habitats for fish, only limited information exists about their usage by fish outside of estuaries. The present study investigated fish assemblages in non-estuarine intertidal habitats where mangroves and seagrass overlap (the mangrove–seagrass continuum). Three habitats (mangrove, mangrove edge, seagrass) were sampled at 4 sites of the Wakatobi Marine National Park, Indonesia, using underwater visual census. Ninety-one species of fish were observed at a mean density of 130.1 ± 37.2 ind. 1000 m–2. Predatory fish (fish that feed on invertebrates and/or fish) were the most dominant feeding groups in the mangroves, whilst omnivores dominated on the mangrove edge and in the seagrass. Although the habitats along the mangrove–seagrass continuum were observed to be important for many fish, only 22 of the 942 coral reef species known within the area utilised mangroves as nursery habitat and only 15 utilised seagrass. Despite finding evidence that nursery grounds in mangroves and seagrass may not directly support high coral reef fish diversity, many of the coral reef nursery species found in this study are likely to be key herbivores or apex predators as adult fish on local coral reefs, and thus highly important to local fisheries. Although mangroves are not permanently inundated by the tide, this study highlights their importance as fish habitats, which at high tide support a greater abundance of fish than seagrass beds. In the light of the high rate of destruction of these habitats, their role in supporting fish assemblages requires consideration in marine resource management programs.
Original languageEnglish
Pages (from-to)85-95
JournalAquatic Biology
Volume5
Issue number1
DOIs
Publication statusPublished - 24 Feb 2009
Externally publishedYes

Keywords

  • Mangrove-seagrass continuum
  • Seascapes
  • Connectivity
  • Fish assemblages
  • Trophic structuring
  • Juvenile habitats
  • Indonesia

Cite this

Unsworth, R. K. F., Garrard, S. L., De Leon, P. S., Cullen, L. C., Smith, D. J., Sloman, K. A., & Bell, J. J. (2009). Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum. Aquatic Biology, 5(1), 85-95. https://doi.org/10.3354/ab00139
Unsworth, Richard K. F. ; Garrard, Samantha L. ; De Leon, Pelayo Salinas ; Cullen, Leanne C. ; Smith, David J. ; Sloman, Katherine A. ; Bell, James J. / Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum. In: Aquatic Biology. 2009 ; Vol. 5, No. 1. pp. 85-95.
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Unsworth, RKF, Garrard, SL, De Leon, PS, Cullen, LC, Smith, DJ, Sloman, KA & Bell, JJ 2009, 'Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum' Aquatic Biology, vol. 5, no. 1, pp. 85-95. https://doi.org/10.3354/ab00139

Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum. / Unsworth, Richard K. F.; Garrard, Samantha L.; De Leon, Pelayo Salinas; Cullen, Leanne C.; Smith, David J.; Sloman, Katherine A.; Bell, James J.

In: Aquatic Biology, Vol. 5, No. 1, 24.02.2009, p. 85-95.

Research output: Contribution to journalArticle

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T1 - Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum

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AU - Garrard, Samantha L.

AU - De Leon, Pelayo Salinas

AU - Cullen, Leanne C.

AU - Smith, David J.

AU - Sloman, Katherine A.

AU - Bell, James J.

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AB - Indo-Pacific mangrove swamps and seagrass beds are commonly located in close proximity to each other, often creating complex ecosystems linked by biological and physical processes. Although they are thought to provide important nursery habitats for fish, only limited information exists about their usage by fish outside of estuaries. The present study investigated fish assemblages in non-estuarine intertidal habitats where mangroves and seagrass overlap (the mangrove–seagrass continuum). Three habitats (mangrove, mangrove edge, seagrass) were sampled at 4 sites of the Wakatobi Marine National Park, Indonesia, using underwater visual census. Ninety-one species of fish were observed at a mean density of 130.1 ± 37.2 ind. 1000 m–2. Predatory fish (fish that feed on invertebrates and/or fish) were the most dominant feeding groups in the mangroves, whilst omnivores dominated on the mangrove edge and in the seagrass. Although the habitats along the mangrove–seagrass continuum were observed to be important for many fish, only 22 of the 942 coral reef species known within the area utilised mangroves as nursery habitat and only 15 utilised seagrass. Despite finding evidence that nursery grounds in mangroves and seagrass may not directly support high coral reef fish diversity, many of the coral reef nursery species found in this study are likely to be key herbivores or apex predators as adult fish on local coral reefs, and thus highly important to local fisheries. Although mangroves are not permanently inundated by the tide, this study highlights their importance as fish habitats, which at high tide support a greater abundance of fish than seagrass beds. In the light of the high rate of destruction of these habitats, their role in supporting fish assemblages requires consideration in marine resource management programs.

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KW - Indonesia

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Unsworth RKF, Garrard SL, De Leon PS, Cullen LC, Smith DJ, Sloman KA et al. Structuring of Indo-Pacific fish assemblages along the mangrove-seagrass continuum. Aquatic Biology. 2009 Feb 24;5(1):85-95. https://doi.org/10.3354/ab00139