Resilience of the larval slipper limpet Crepidula onyx to direct and indirect-diet effects of ocean acidification.
Resilience of the larval slipper limpet Crepidula onyx to direct and indirect-diet effects of ocean acidification.
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DOI：
10.1038/s41598-017-12253-2
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发表时间：
2017-09-21
影响因子：
4.6
通讯作者：
Chan KYK
中科院分区：
文献类型：
--
作者：
Maboloc EA;Chan KYK
众所周知，海洋酸化（OA）会直接影响许多海洋生物的幼虫生理和发育。 OA 还会影响藻类的营养质量和适口性，藻类是多种浮游幼虫的主要食物来源。然而，OA 通过营养相互作用产生的潜在间接影响尚未得到充分探索。在这项研究中，Crepidula onyx 的 veligers 暴露于代表环境（作为对照）和低 pH 值（pH 7.7 和 pH 7.3）的不同 pH 值水平 14 天，并喂食在这三个各自 pH 值下培养的等鞭金藻。 pH值、饮食及其相互作用对幼虫死亡率没有影响。单独降低 pH 值对生长速度和壳尺寸有显着影响。在低 pH 值处理中还观察到幼虫壳的结构变化（孔隙率增加）。酸化和饮食质量下降之间的相互作用促进了早期定居。与其他钙化软体动物不同，这种在 20 世纪 60 年代引入香港的拖鞋帽种群似乎对 OA 具有抵抗力，并且藻类营养价值下降。如果实验室观察到的这种稳健性适用于野外，与本地无脊椎动物的竞争可能会加剧，这种非本地蜗牛可能会在酸化的沿海生态系统中蓬勃发展。
Ocean acidification (OA) is known to directly impact larval physiology and development of many marine organisms. OA also affects the nutritional quality and palatability of algae, which are principal food sources for many types of planktonic larvae. This potential indirect effect of OA via trophic interactions, however, has not been fully explored. In this study, veligers of Crepidula onyx were exposed to different pH levels representing the ambient (as control) and low pH values (pH 7.7 and pH 7.3) for 14 days, and were fed with Isochrysis galbana cultured at these three respective pHs. pH, diet, nor their interactions had no effect on larval mortality. Decrease in pH alone had a significant effect on growth rate and shell size. Structural changes (increased porosity) in larval shells were also observed in the low pH treatments. Interactions between acidification and reduced diet quality promoted earlier settlement. Unlike other calcifying molluscs, this population of slipper limpets introduced to Hong Kong in 1960s appeared to be resilient to OA and decreased algal nutritional value. If this robustness observed in the laboratory applies to the field, competition with native invertebrates may intensify and this non-native snail could flourish in acidified coastal ecosystems.
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