Ecosystem models of scottish sea lochs for assessing the impact of nutrient enrichment

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Abstract

A previously published model is used to assess the effects of potential disturbances on a sea-loch ecosystem. Nutrient enrichment on its own has little or no effect, and the only major consequence of enhanced or depressed light conditions is a phase shift in the spring bloom. For the fjordic systems modelled, the most important type of disturbance is a reduction in grazing, which can result in high levels of phytoplankton biomass for much of the year. In the absence of grazing control, primary production in these systems becomes nutrient-limited, and it is concluded that the most serious threat would be posed by a reduction in grazing rate combined with an increase in nutrient loading.
Original languageEnglish
Pages (from-to)359-367
Number of pages8
JournalICES Journal of Marine Science
Volume50
Issue number4
DOIs
Publication statusPublished - Nov 1993

Keywords

  • disturbance
  • sea loch
  • grazing
  • nutrient enrichment
  • irradiance
  • phytoplankton
  • zooplankton
  • toxicity
  • fjord

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