• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Diurnal effects of Holothuria atra on seawater carbonate chemistry in a sedimentary environment
【24h】

Diurnal effects of Holothuria atra on seawater carbonate chemistry in a sedimentary environment

机译：沉积环境中全鞘尿对海水碳酸盐化学的日变化影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sea cucumbers are important to coral reef ecosystems due to their roles in the recycling of nutrients and their potential ability to elevate A(T)/DIC by the dissolution of sediments in their gut. The contribution of the sea cucumber Holothuria atra to the dissolution of sediment CaCO3 was assessed at mid-day and midnight. The results showed that the presence of H. atra significantly increases sediment dissolution rates and Total Ammonia Nitrogen (TAN = NH3 + NH4+) concentrations. While there was a trend for the effect of H. atra on sediment dissolution to be greater during the day than at night, this trend was not significant. Significantly different day versus night responses - irrespective of sea cucumber presence - were observed for all carbonate parameters over the 1-2 h incubation periods, reflecting an impact of sediment-associated micro-organisms in closed recirculating as opposed to open water systems over a period of three days (cumulative effect). Over three days, the significantly higher daytime DIC concentrations in the presence of H. atra were driven by elevated bicarbonate (HCO3-). During the incubation periods, the effects of the animals on DIC concentration were lost by a significant increase in CO2 concentrations arguably by microbial processes within the sediments. The ocean acidification (OA) buffering capacity of the animals, estimated by changes in A(T)/DIC ratios, was greater during nighttime but equivalent to that observed in the sediments over the incubation periods and in the open water system. The results suggest that H. atra not only will not assist daytime calcification, given by a decrease in buffering capacity at daytime, but also may exacerbate the impacts of OA due to the dissolution of CaCO3 resulting from their turnover of sediments. Finally, in areas with seawater with prolonged residence over sediments, such as ponding lagoons, the local environment is likely to rapidly deplete any pH buffering potential offered by H. atra. (C) 2015 Elsevier B.V. All rights reserved.
机译：海参对珊瑚礁生态系统很重要，因为它们在养分的循环利用中具有重要作用，并且通过溶解肠道中的沉积物具有提高A（T）/ DIC的潜在能力。在白天和午夜评估了海参全氟辛烷磺酸对沉积物CaCO3溶解的贡献。结果表明，背叶假单胞菌的存在显着提高了沉积物溶解速率和总氨氮（TAN = NH3 + NH4 +）浓度。尽管在白天比晚上有更大的趋势，H。atra对沉积物溶解的影响要大，但这种趋势并不明显。在1-2小时的培养期内，所有碳酸盐参数在白天和晚上的响应（无论是否存在海参）都存在显着差异，反映了一段时间内开放水系统相对于封闭循环系统中与沉积物相关的微生物的影响三天（累积效果）。在三天的时间里，H。atra存在时白天DIC浓度显着更高是由碳酸氢盐（HCO3-）升高引起的。在潜伏期，动物对DIC浓度的影响因沉积物中微生物过程引起的CO2浓度显着增加而丧失。通过A（T）/ DIC比值的变化估计，动物的海洋酸化（OA）缓冲能力在夜间更大，但与在潜伏期和开放水域沉积物中观察到的相当。结果表明，由于白天缓冲能力的降低，H。atra不仅不能帮助白天钙化，而且由于沉积物周转所引起的CaCO3溶解，可能加剧OA的影响。最后，在海水长时间停留在沉积物上方的区域（例如池塘泻湖）中，当地环境可能会迅速耗尽嗜血杆菌的任何pH缓冲潜力。 （C）2015 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号