Temperature effects on the growth and survival of reef corals Stylophora pistillata and Seriatopora hystrix: A mesocosm study
Date Issued
2004
Date
2004
Author(s)
Ya-Hsuan, Tung
DOI
zh-TW
Abstract
The purpose of this study is to compare the effects of sea temperature on growth rate and mortality of reef corals, Stylophora pistillata and Seriatopora hystrix. Coral colonies were collected from Nanwan Bay, southern Taiwan. Coral branches were prepared and cultured in mesocosms at three temperature regimes (28, 25 and 20℃, each 2 replicates). The growth of corals was measured at three-week intervals by a buoyant weighting technique. The mean growth rates of S. pistillata and S. hystrix at 25℃(S. pistillata: 0.0126±0.0045 g/g*day; S. hystrix: 0.0253±0.0081 g/g*day) were significantly higher than those at 28℃(S. pistillata: 0.0066±0.0027 g/g*day; S. hystrix: 0.0083±0.0046 g/g*day) and 20℃(S. pistillata: 0.0058±0.0014 g/g*day; S. hystrix: 0.0047±0.0022 g/g*day).The mean growth rates of S. hystrix in two mesocosms at 25℃ were similar and significantly higher than those of S. pistillata. However, the mean growth rates of S. pistillata in two mesocosms at 25℃ were significantly different. The mean growth rates of S. hystrix in two mesocosms at 28℃ were significantly different and did not show a consistant relationship compared to those of S. pistillata. The mean growth rates of S. hystrix in two mesocosms at 20℃ were significantly different, but those of S. pistillata were the same. This suggests that the effects of temperature on growth of the two coral species were different. Growth rates of S. hystrix at 25℃ were stable and higher than those of S. pistillata. However, the effects of temperature on growth rate of S. hystrix may be modified by other factors (e.g., mesocosm effect) in higher or lower temperatures. The mortality of S. pistillata in three temperature treatments was very low, while the partial mortality of S. hystrix at 28℃ (37.5 %) was significantly higher than that at 25 (2.1 %) and 20℃ (2.1 %). This suggests that S. hystrix is more sensitive and vulnerable to high sea temperatures.
Subjects
存活率
溫度
中型生態箱
生長率
尖枝列孔珊瑚
萼柱珊瑚
growth rate
Seriatopora hystrix
survival rate
mesocosm
temperature
Stylophora pistillata
Type
thesis
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