Influence of Hydrological Regime in Determining the Response of Macroalgal Blooms to Nutrient Loading in Two Irish Estuaries

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• 作者：Sorcha Ní Longphuirt ; Shane O’Boyle ; Robert Wilkes…
• 关键词：Opportunistic macroalgae ; Residence time ; Nutrient source ; Estuarine model ; Anthropogenic pressures ; Seasonal river flow
• 刊名：Estuaries and Coasts
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：39
• 期：2
• 页码：478-494
• 全文大小：3,615 KB
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• 作者单位：Sorcha Ní Longphuirt (1) (2)
  Shane O’Boyle (1)
  Robert Wilkes (3)
  Tomasz Dabrowski (4)
  Dagmar Brigitte Stengel (2)
  
  1. Environmental Protection Agency, Richview, Clonskeagh, Dublin, 14, Ireland
  2. Botany and Plant Science, School of Natural Sciences, Ryan Institute for Environmental, Marine and Energy Research, National University of Ireland Galway, Galway, Ireland
  3. Environmental Protection Agency, John Moore Road, Castlebar, Co Mayo, Ireland
  4. Marine Institute, Rinville, Oranmore, Co. Galway, Ireland
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Ecology
  Geosciences
  Environmental Management
  Nature Conservation
  
• 出版者：Springer New York
• ISSN：1559-2731

文摘

Eutrophication and the development of persistent opportunistic macroalgal blooms are recognised as one of the main detrimental effects of increased anthropogenic pressures on estuarine and coastal systems. This study aimed to highlight the interplay between pressures and controlling physical factors on ecosystem functioning. The hypothesis that hydrological regime can control the growth of opportunistic macroalgae was tested with the study of two Irish estuaries, the Argideen and the Blackwater, with similar nutrient loading sources but divergent hydrological regimes. Seasonal monitoring data was initially examination, while the application of a pre-existing box model allowed a further analysis of the influence of residence time and nutrient load modifications on macroalgal growth. Seasonal oscillations in monitored river flow rates altered nutrient transfer from the catchments to the estuaries in both cases, as is shown through differences between winter and summer nutrient concentrations. In the Argideen, however, the relative contribution of phosphorus (P) from adjacent marine waters was high due to the shorter residence times and greater influx of marine water into the estuary. Modelling studies showed that in the Argideen Estuary, P load reduction would have potentially minimal impact on macroalgal growth due to the shorter residence time which increased the influx of P from marine sources. Nitrogen (N) load reduction of 60 % had a significant, albeit limited, impact on macroalgae and was insufficient in achieving the environmental objectives for this waterbody. For the more river-dominated Blackwater Estuary, modelled reductions in P resulted in a considerable decrease in biomass. Any further P decreases would accentuate the existing disparity in estuarine N:P ratios with possible repercussions for N transport to the coastal system. Hence, the hydrological complexity of estuarine systems demonstrated dictates that a portfolio of separate, but complimentary, management approaches may be required to address eutrophication in these estuaries. Keywords Opportunistic macroalgae Residence time Nutrient source Estuarine model Anthropogenic pressures Seasonal river flow