Effects of reduced pH on the growth and survival of postlarvae of the donkey’s ear abalone, Haliotis asinina (L.)
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- 作者：Abduraji S. Tahil ; Danilo T. Dy
- 关键词：Abalone seed production ; Daily growth rates ; Mortality ; Ocean acidification
- 刊名：Aquaculture International
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：23
- 期：1
- 页码：141-153
- 全文大小：396 KB
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18. Kroeker KJ, Kordas RL, Crim R, Hendricks IE, Rama - 作者单位：Abduraji S. Tahil (1) (2)
Danilo T. Dy (1)
1. Department of Biology, University of San Carlos Talamban, Nasipit, Cebu City, Philippines
2. USC Marine Research Station, 6015, Maribago, Lapu-Lapu City, Cebu, Philippines - 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Hydrobiology - 出版者：Springer Netherlands
- ISSN：1573-143X
文摘
High atmospheric CO2 levels primarily from burning fossil fuels have increased CO2 concentration in the surface water of the ocean, this in turn has resulted in a drop in seawater pH known as “ocean acidification-(OA) and presents a potential threat to calcifying marine organisms. Up to the present, however, the impacts of OA on the early developmental stages of tropical abalone were not known. For the first time in the Philippines, we investigated the direct effects of reduced pH on the growth and survival of the postlarvae of the donkey’s ear abalone, Haliotis asinina L. H. asinina is the only commercial species of haliotid in the country. We reduced the ambient pH (7.99) of experimental seawater by bubbling food-grade CO2 to obtain the desired pH levels as expected by the year 2100. Survival of H. asinina postlarvae was negatively affected by reduced pH. Mean survival of postlarvae significantly decreased from 86.3?% at ambient conditions to 47.2 and 18.3?% at pH 7.62 and 7.42, respectively, after 20?days (P?P?>?0.05). Mean shell lengths of postlarvae also differed significantly among treatments and across exposure period (P?=?0.000 for both). Postlarvae reared at pH 7.62 and pH 7.42 exhibited smaller shell size (138 and 124?μm, respectively) compared to those at ambient conditions (175?μm). Postlarvae reared at pH 7.81 showed larger shell length (162?μm) compared to the postlarvae reared at pH 7.42 (124?μm). Across time, significant increase in shell size from day 5 to day 20 was observed only in postlarvae reared at ambient conditions (P?=?0.000) and in the pH 7.81 treatment (P?=?0.006). Daily growth rate decreased significantly from 2.83?μm?day? (ambient) to 0.95 and 0.30?μm?day? at pH 7.62 and 7.42, respectively. Our results suggest that growth and survival of postlarval H. asinina was found to be sensitive to reduced pH of seawater. This implies that future decrease in pH unit of the world’s oceans will most likely threaten the natural population of this economically important species.