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首页> 外文期刊>Estuarine Coastal and Shelf Science >Long-term changes in the production by estuarine macrobenthos affected by multiple stressors
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Long-term changes in the production by estuarine macrobenthos affected by multiple stressors

机译：受多种压力影响的河口大型底栖动物的长期生产变化

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摘要

The macrobenthic production of an estuarine system was evaluated over a 14-year study period in a seagrass bed and in a sandflat. Over this period, the estuary suffered severe eutrophication and extreme weather events with important impacts on the community, impairing system functioning and ultimately the goods and services provided by the estuary (decline in the seagrass bed, decreased community production and/or a boost in the production by opportunist species, such as Hydrobia ulvae). Following the anthropogenic impacts, management measures were introduced which allowed a gradual recovery of the seagrass bed and a new macrobenthic community structure manifested by production increases of slow-growing species, such as Scrobicularia plana and Hediste diversicolor. There was a gradual re-orientation of energy into population biomass instead of population density but this was not translated into higher community production, mainly due to the decreased production of opportunist species (H. ulvae and several polychaetes). Several weather extreme events occurred during this post-mitigation phase - floods, heatwaves and droughts, all of which had negative impacts on macrobenthic dynamics and production. The heatwaves led to the greatest decreases in macrobenthic production, mainly due to S. plana perhaps associated with its physiological intolerance of higher temperatures. The prolonged drought that followed the heatwaves maintained low levels of production by S. plana and H. ulvae. With climate change, the frequency and intensity of extreme weather events are likely to increase worldwide so that the recovery of impacted/disturbed systems from impacts such as eutrophication may be seriously affected by these additional stressors, compromising attempts to improve the ecological quality of estuarine ecosystems.
机译：在长达14年的研究期内，在海草床和沙滩中评估了河床系统的大型底栖动物生产。在此期间，河口遭受了严重的富营养化和极端天气事件，对社区产生了重要影响，削弱了系统的功能，并最终损害了河口提供的商品和服务（海草床减少，社区产量下降和/或河口增加）。由机会主义物种生产，例如水Hydro。继人为影响之后，引入了管理措施，使海草床逐渐恢复，并以缓慢增长的物种（如Scrobicularia Plana和Hediste diversicolor）的产量增加为特征，显示了新的大型底栖动物群落结构。能量逐渐重新定向为种群生物量，而不是种群密度，但这并未转化为更高的社区生产，这主要是由于机会主义物种（H. ulvae和几个多毛cha）的产量下降。在缓解后的这一阶段中发生了数种极端天气事件-洪水，热浪和干旱，所有这些都对大型底栖动物的动态和生产产生了负面影响。热浪导致大型底栖动物的产量下降最多，这主要是由于扁平链球菌可能与其对高温的生理耐受性有关。紧随热浪之后的长期干旱使Plane。S. and ul。ulvae的产量保持较低水平。随着气候变化，全球范围内极端天气事件的频率和强度可能会增加，因此这些额外的压力因素可能严重影响从富营养化等影响中恢复/受干扰的系统的恢复，从而损害了改善河口生态系统生态质量的尝试。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第1期|p.10-18|共9页
  • 作者

    M. Dolbeth; RG. Cardoso; T.F. Grilo; M.D. Bordalo; D. Raffaelli; M.A. Pardal;

  • 作者单位

    CFE — Centre for Functional Ecology, Department of Life Sciences, University ofCoimbra, Apartado 3046, 3001-401 Coimbra, Portugal;

    lMAR - Institute of Marine Research, Marine and Environmental Research Centre (IMAR-CMA), Department of Life Sciences, University ofCoimbra, Apartado 3046, 3001-401 Coimbra, Portugal;

    CFE — Centre for Functional Ecology, Department of Life Sciences, University ofCoimbra, Apartado 3046, 3001-401 Coimbra, Portugal;

    CFE — Centre for Functional Ecology, Department of Life Sciences, University ofCoimbra, Apartado 3046, 3001-401 Coimbra, Portugal;

    Environment Department, University of York, Heslington, York TO JO 5DD, UK;

    CFE — Centre for Functional Ecology, Department of Life Sciences, University ofCoimbra, Apartado 3046, 3001-401 Coimbra, Portugal;

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  • 正文语种 eng
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  • 关键词

    macrobenthos production; estuary; eutrophication; climate extremes; recovery;

    机译：大型底栖动物生产;河口;富营养化;极端气候;恢复;

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