Colonization and assemblage patterns of fishes on concrete structures manipulated for coral rehabilitation: Technical paper no. 2/2002
2002
Ukkrit Satapoomin(Department of Fisheries, Bangkok (Thailand). Phuket Marine Biological Center)
Colonization and assemblage patterns of fishes were monitored in the experiment plots of three different concrete structures manipulated for coral rehabilitation study at Maithon Island, Phuket. Fish abundances were assessed during 4 sampling occasions including the first sampling (TO), about one month before placement of the concrete structures, and the other three subsequent assessments at the fourth (T4), nineteenth (T19) and eighty-fifth (T85) months after placement of the structures. Early colonization of fishes (in terms of both numbers of species and individuals) was rapid being contributed largely by immigration of fishes from nearby coral patches in the reef. Most of population parameters measured at T4 were significantly greater compared to To, but not with the following samplings (T19 and T85). Fish assemblages did not differ among the plot types of different concrete structures, while they were distinguishable over time. It was notable especially when comparisons were made between the assemblages at T85 (as more stable in species composition) and those of the earlier periods (with much more variation in species composition). The developemtn of fish assemblages seems to be related to the habitat-use patterns of fishes which also coincides with the establishment and development of the community of fouling organisms, particularly corals, on the concrete structures. Along with such development, the plot area has been either increased in or diversified both food and microhabitats for fishes. These will ultimately promote the assemblages of fishes in the area.
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