Community structure and condition of seagrass meadows in Ayau Islands, Raja Ampat Regency

Authors

  • Andri Irawan Research Center for Deep Sea - Indonesian Institute of Sciences
  • Muhammad Hafizt Research Center for Oceanography – Indonesian Institute of Sciences
  • Udhi Eko Hernawan Research Center for Oceanography – Indonesian Institute of Sciences https://orcid.org/0000-0003-3098-1818

DOI:

https://doi.org/10.14203/mri.v45i1.564

Keywords:

seagrass, outer island, expedition, baseline information, status

Abstract

Seagrass meadows are an important component of coastal ecosystems, providing many ecosystem services beneficial for human well-being. Basic information about seagrass meadows in Indonesia is relatively limited, particularly in the eastern part of Indonesia, such as the remote Ayau Islands in Raja Ampat. In this paper, we reported the community structure and condition of seagrass meadows in Ayau Islands surveyed during Nusa Manggala Expedition in November 2018. We conducted the seagrass survey using quadrat transect method at five locations, i.e. Reni, Rutum, Abidon, Kanober, and Dorehkar. In the survey, we assessed parameters of community structure, including habitat extent, species composition, seagrass cover, seagrass density, macroalgae and epiphyte cover. We also recorded environmental parameters, i.e. substrate types, water clarity, salinity, water temperature, and nutrient (phosphate and nitrate). Our study showed that seagrass meadows in Ayau Islands are multispecies meadows, composed of two to five species. In overall, five species recorded in Ayau Islands are Cymodocea rotundata, Enhalus acoroides, Halodule pinifolia, Halophila ovalis, and Thalassia hemprichii. The most common species is T. hemprichii as it can be found in all locations. Meadows in Reni, Rutum, and Dorehkar are in a healthy condition, while in Abidon and Kanober are in less healthy condition. This information is of significance as baseline information needed for seagrass conservation planning.

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Published

2020-07-21

How to Cite

Irawan, A., Hafizt, M., & Hernawan, U. E. (2020). Community structure and condition of seagrass meadows in Ayau Islands, Raja Ampat Regency. Marine Research in Indonesia, 45(1), 13–24. https://doi.org/10.14203/mri.v45i1.564

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Original Research Articles