...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Indirect effects of bioturbation by the burrowing sandprawn Callichirus kraussi on a benthic foraging fish, Liza richardsonii
【24h】

Indirect effects of bioturbation by the burrowing sandprawn Callichirus kraussi on a benthic foraging fish, Liza richardsonii

机译：穴居沙虾Callichirus kraussi的生物扰动对底栖觅食鱼Liza richardsonii的间接影响

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

The alteration of sediments by bioturbating organisms plays a major role in aquatic ecosystems, from both ecological and evolutionary perspectives. Several studies have highlighted the ability of bioturbators to alter sedimentary biogeochemical processes and community structure, but the potential influence of bioturbators on pelagic species is unexplored in marine ecology. In the present study, we investigated the direct effects of bioturbation by a southern African burrowing sandprawn, Callichirus kraussi, on primary producers (benthic microalgae) and the indirect effects on the growth of a fish (grey mullet Liza richardsonii) that consumes microalgae. A mesocosm experiment was undertaken in which similar-sized L. richardsonii at 2 densities were exposed to 3 increasing densities of C. kraussi. After 3 wk of exposure to the effects of C. kraussi, the fish were weighed and their lengths measured to calculate their physical condition and growth rates. At the termination of the experiment, the microalgal biomass and sediment turnover were measured in each mesocosm. Higher C. kraussi densities resulted in an increase in sediment turnover and caused reductions in microalgal biomass, which in turn led to a reduction of the biomass and lengths of L. richardsonii. Increasing densities of C. kraussi evidently enhance sediment turnover from burrows to the sediment surface, leading to the burial of microalgae and indirect reductions in food availability to L. richardsonii. This reduction in turn leads to metabolic losses and reductions in the growth of this fish species. These results indicate that benthic bioturbators can have strong effects on aquatic ecosystems, especially by modulating energy flow to nektonic species.
机译：从生态和进化的角度来看，通过生物扰动生物对沉积物的改变在水生生态系统中起着重要作用。几项研究强调了生物扰动器改变沉积生物地球化学过程和群落结构的能力，但是在海洋生态学中尚未探索生物扰动器对远洋物种的潜在影响。在本研究中，我们调查了南部非洲穴居沙虾Callichirus kraussi进行的生物扰动对初级生产者（底栖微藻）的直接影响以及对食用微藻的鱼类（灰鱼Liza richardsonii）生长的间接影响。进行了介观试验，其中将2个密度的相似大小的李氏乳杆菌暴露于3个密度递增的克氏梭菌。在暴露于克氏梭菌的影响下3周后，对鱼进行称重并测量其长度，以计算其身体状况和生长速度。在实验结束时，在每个中观中测量了微藻的生物量和沉积物周转率。较高的克氏梭菌密度导致沉积物周转量增加，并导致微藻生物量减少，进而导致了李氏梭菌的生物量和长度的减少。克劳氏梭菌密度的增加明显增加了从洞穴到沉积物表面的沉积物周转率，从而导致了微藻的埋葬并间接减少了里氏乳杆菌的食物供应。这种减少反过来导致新陈代谢损失和该鱼种生长的减少。这些结果表明底栖生物扰动器可以对水生生态系统产生强烈影响，特别是通过调节向中性物种的能量流动。

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