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Fertility and food availability

Stonefly larvae and mayfly larvae

Stonefly larvae (2 tails) and mayfly larvae (3 tails) live in well oxygenated streams and are eaten by trout and juvenile salmon

Habitat fertility and the availability of food are key factors which determine the productivity of most fish populations in Wester Ross. Across much of Wester Ross, biological production is limited by the availability of nutrients, particularly phosphorus. Rainwater contains little phosphorus; the rocks underlying many of the river catchment areas of Wester Ross rivers yield very little phosphorus. The fertility of the land and waters that flow from the land is therefore largely determined by the ecosystem and by anthropogenic influences.

Much of Wester Ross has been heavily grazed by cattle, sheep and deer over hundreds of years. Removal of livestock and deer carcasses from catchment areas represents a net export of nutrients that under more natural ecosystem conditions have become available to aquatic life. Formerly there were also more people living in headwater areas, contributing to nutrient recycling in a semi-natural way. In terms of nutrient cycling, people, in the past, were a part of the ecosystem.

Baile mor Woodland

Trout lochs in the new woodland

Trout lochs in the new woodland

By reducing grazing pressures, planting trees and applying fertilizer, soils are given a chance to recover. The largest WGS in Scotland, the Baile mor Woodland established by Gairloch Estate, is located between Gairloch and Loch Maree. There are trout lochs in the new woodland and these may become more productive as the trees become established.

Related Downloads

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  • Billier, Geoffrey (2014) A study of macro-invertebrates and the feeding behaviour of juvenile salmon in the Little Gruinard River SAC, 2014
    Geoffrey Billier sampled macro-invertebrates and investigate the feeding behaviour of juvenile salmon in the Little Gruinard river, during a three-month internship for WRFT, as part of his studies at Ecole Nationale Sup?rieure Agronomique de Toulouse 'ENSAT'. This report provides much new information about the biodiversity of macro-invertebrates in the river, drift patterns (day & night) and the diet of salmon fry, parr and smolts.  Posted: 30/09/2014 (3.22MB)
  • Dang, Vu H. (2013) Preliminary investigation of Aquatic Macro-Invertebrate Biodiversity in the Gairloch Hill Lochs, Wester-Ross Shire
    This thesis by Middlesex University student Vu Dang investigates the aquatic macro-invertebrates biodiversity of lochs at varying altitudes, located in the Gairloch district, Wester Ross Shire, Scotland.  Posted: 13/12/2013 (2.35MB)
  • Ecosystem Fertility & Salmon Smolt Seminar November 2007
    This report is a compliation of summaries of presentations at the WRFT Ecosystem Fertility Seminar in Gairloch on 30th November, 2007.  Posted: 05/09/2008 (390KB)
  • Ecosystem fertility and (wild)life production in Wester Ross
    Presentation given at Assynt Field Club meeting at Lochinver on 17th November 2016. After providing an explanation of ‘ecosystem fertility’, the presentation considers long term changes in ecosystem fertility: at Beinn Eighe NNR; of grazing areas around crofting townships; and of large areas of land managed for red deer. The presentation focuses on the need to develop practices that conserve and replenish phosphorus within Wester Ross. Opportunities for trials and demonstration projects to raise awareness of the importance of ecosystem nutrition and the need for managing fertility could be taken forward in collaboration with the Wester Ross Biosphere. .  Posted: 18/11/2016 (25.30MB)
  • Ecosystem Nutrition in Wester Ross Poster DRAFT1
    The poster has been drafted with some ideas for ways to conserve and replenish phosphorus within Wester Ross. The file includes some explanation of the ideas presented. Comments welcome! .  Posted: 18/11/2016 (987KB)
  • Grazing, Trees and Trout illustrated report
    This workshop, supported by The Woodland Trust, Forestry Commission Scotland and Wester Ross Fisheries Trust, focused on opportunities for integrating woodlands with other land management practices, including management of sheep and deer. .  Posted: 27/07/2017 (1.15MB)
  • Land Use and Salmon Smolt Production in Wester Ross
    Presentation given by Peter Cunningham at the WRFT Ecosystem Fertility and Salmon Smolt Production Seminar on 30th November 2007. Describes growth of juvenile salmon in Wester Ross and how this relates to soil fertility and land management. Note large size of file!.  Posted: 05/09/2008 (22.41MB)
  • Little Gruinard juvenile fish assessment 2006 report
    This illustrated report presents the results of the 2006 WRFT Little Gruinard electro-fishing survey. Relationships between juvenile salmon abundance and habitat characteristics are discussed. The natural production of juvenile salmon in this Special Area of Conservation (SAC) for Atlantic salmon could be strengthened through restoring levels of natural fertility within the Little Gruinard catchment area.  Posted: 22/09/2008 (964KB)
  • Mamo, Sara (2013) Trophic Status and Ontogeny: An Analysis of Brown Trout (Salmo trutta, L.1758) Growth and Diet in Wester Ross, Scotland
    This thesis by Middlesex University student Sara Mamo investigates the diet and growth of brown trout in Loch Coire na h-Airigh and Loch Feur, Wester Ross.  Posted: 13/12/2013 (1.17MB)
  • March brown recording scheme
    Buglife Scotland's March brown survey 2010.  Posted: 04/03/2010 (178KB)
  • Presentation by John Roberston (FWAG) on SRDP funding
    Presentation by John Roberston (FWAG) on SRDP funding given at workshop on 26th January 2009. Click on the links in this presentation to explore related pages on the SRDP website.  Posted: 04/02/2009 (457KB)
  • Refertilising Scotland part 1
    Part 1 of presentation given by Peter Cunningham at Reforesting Scotland Annual meeting at Torridon Village Hall on 25th September 2010.  Posted: 27/09/2010 (25.99MB)
  • Refertilising Scotland part 2
    Part 2 of presentation given by Peter Cunningham at the Reforesting Scotland Annual meeting at Torridon Village Hall on 25th September 2010.  Posted: 27/09/2010 (15.03MB)
  • Refertilising Wester Ross 7-9 April 2016 programme
    Programme for three-day meeting to review issues relating to the fertility and productivity of land and freshwaters in Wester Ross, including speakers for the workshop on Friday 8th April in the Gairloch Community Hall.  Posted: 28/03/2016 (810KB)
  • Refertilising Wester Ross April 2016 Meeting Report
    This report provides a summary of the three-day meeting in April 2016 which focussed on the human ecology of nutrient availability and the need to manage fertility in Wester Ross. The meeting was attended by over 40 participants, including representatives from a wide range of government agencies and NGOs. This report provides links to presentations and other information.  Posted: 22/04/2016 (1.57MB)
  • Report from Field excursion to Beinn Eighe NNR & Glen Torridon on 7th April 2016
    This report is based on photos (GoPro video screenshots) from the excursion to sites by the Pony Path in Beinn Eighe NNR and sites around Loch an Iasgair (Torridon river headwaters) and includes a summary of much of the discussion.  Posted: 22/04/2016 (6.75MB)
  • Response to Beinn Eighe NNR Management Plan September 2009
    Response from Peter Cunningham to Beinn Eighe NNR Management Plan.  Posted: 02/10/2009 (174KB)