...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Temporal changes of a macrobenthic assemblage in harsh lagoon sediments
【24h】

Temporal changes of a macrobenthic assemblage in harsh lagoon sediments

机译：苛刻泻湖沉积物中大型底栖动物组合的时间变化

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

An opportunistic macrobenthic assemblage was studied from 2001 to 2003 in a central area of the Cabras lagoon (western Sardinia, Italy), known to be affected by environmental disturbances (i.e. organic over-enrichment of sediments, and episodic events of hypoxia/anoxia and sulphide development). We identified recurrent seasonal changes in this macrobenthic assemblage, with a general impoverishment in summer and a recovery in winter/spring. The nereids Neanthes succinea and Hediste diversicolor were found to replace the spionid Polydora ciliata as the most dominant species in the summer for 3 consecutive years. Occasional, unsynchronized appearances of small-sized deposit feeders, such as Tubificidae, Capitella cf. capitata, chironomid larvae and Hydrobia spp., were observed in winter/spring. We suggest that these changes are driven by the interplay of environmental conditions (worse in summer) with numerous biotic factors. This includes different tolerance levels of taxa to low oxygen concentrations and sulphides, variability in larval supply and post-larval transport, as well as competition for space and food between and within different functional groups, and facilitation through animal bioturbation and sediment reoxidation. A conceptual model is proposed to demonstrate how environmental conditions and biotic interactions may control the benthic assemblage in such a harsh lagoon environment.
机译：2001年至2003年，在Cabras泻湖（意大利撒丁岛西部）的中部地区研究了机会性大型底栖动物组合，已知该环境受到环境干扰（例如，沉积物有机过度富集以及缺氧/缺氧和硫化物的突发事件）的影响开发）。我们确定了这种大型底栖动物组合的周期性季节性变化，夏季普遍贫困，冬季/春季恢复。连续3年发现，nereids琥珀色Neanthes琥珀色和Hediste diversicolor取代了蜘蛛状纤毛Polydora纤毛，成为夏季最主要的物种。小型存款喂食器的偶尔出现，不同步的外观，例如Tubificidae，Capitella cf.在冬季/春季观察到了ita鱼，chi虫幼虫和Hydrobia spp.。我们建议，这些变化是由环境条件（夏季更糟）与众多生物因子相互作用共同驱动的。这包括分类单元对低氧浓度和硫化物的不同耐受水平，幼体供应和幼体后运输的变异性，以及不同功能组之间和内部对空间和食物的竞争，以及通过动物生物扰动和沉积物再氧化的促进。提出了一个概念模型来证明在这种恶劣的泻湖环境中环境条件和生物相互作用如何控制底栖动物群。

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