Scottish Marine and Freshwater Science Volume 5 Number 9: Strategic Surveys of Seabirds off the West Coast of Lewis to Determine Use of Seaspace in Areas of Potential Marine Renewable Energy Developments

By 2020 the percentage of Scotland‟s energy coming from renewable sources will increase. Studies have identified that there is a need to research how offshore renewable developments affect wildlife populations. The surveys presented here will help to find


Appendix I. Figures

Figure 2 - HiDef Quality Assurance Procedure

Figure 2 – HiDef Quality Assurance Procedure

Figure 3 - WWT HiDef Quality Assurance Procedure

Figure 3 – WWT HiDef Quality Assurance Procedure

Figure 4 - Loch Roag survey sections

Figure 4 – Loch Roag survey sections

Figure 5 - April eider and diver records from digital aerial survey

Figure 5 – April eider and diver records from digital aerial survey

Figure 6 - April fulmar records from digital aerial survey

Figure 6 – April fulmar records from digital aerial survey

Figure 7 - April gannet records from digital aerial survey

Figure 7 - April gannet records from digital aerial survey

Figure 8 - April gull and skua records from digital aerial survey

Figure 8 – April gull and skua records from digital aerial survey

Figure 9 - April auk records from digital aerial survey

Figure 9 – April auk records from digital aerial survey

Figure 10 - April cetacean records from digital aerial survey

Figure 10 – April cetacean records from digital aerial survey

Figure 11 - May eider and shag records from digital aerial survey

Figure 11 – May eider and shag records from digital aerial survey

Figure 12 - May fulmar records from digital aerial survey

Figure 12 – May fulmar records from digital aerial survey

Figure 13 - May gannet records from digital aerial survey

Figure 13 – May gannet records from digital aerial survey

Figure 14 - May gull records from digital aerial survey

Figure 14 – May gull records from digital aerial survey

Figure 15 - May auk records from digital aerial survey

Figure 15 – May auk records from digital aerial survey

Figure 16 - June duck and diver records from digital aerial survey

Figure 16 – June duck and diver records from digital aerial survey

Figure 17 - June fulmar records from digital aerial survey

Figure 17 – June fulmar records from digital aerial survey

Figure 18 - June gannet records from digital aerial survey

Figure 18 – June gannet records from digital aerial survey

Figure 19 - June gull species records from digital aerial survey

Figure 19 – June gull species records from digital aerial survey

Figure 20 - June auk records from digital aerial survey

Figure 20 – June auk records from digital aerial survey

Figure 21 - June cetacean, marine mammal and shark records from digital aerial survey

Figure 21 – June cetacean, marine mammal and shark records from digital aerial survey

Figure 22 - July shag and duck species records from digital aerial survey

Figure 22 – July shag and duck species records from digital aerial survey

Figure 23 - July fulmar records from digital aerial survey

Figure 23 – July fulmar records from digital aerial survey

Figure 24 - July gannet records from digital aerial survey

Figure 24 – July gannet records from digital aerial survey

Figure 25 - July gull and skua records from digital aerial survey

Figure 25 – July gull and skua records from digital aerial survey

Figure 26 - July auk records from digital aerial survey

Figure 26 – July auk records from digital aerial survey

Figure 27 - July cetacean, marine mammal and shark records from digital aerial survey

Figure 27 – July cetacean, marine mammal and shark records from digital aerial survey

Figure 28 - September diver and cormorant records from digital aerial survey

Figure 28 – September diver and cormorant records from digital aerial survey

Figure 29 - September fulmar records from digital aerial survey

Figure 29 – September fulmar records from digital aerial survey

Figure 30 - September gannet records from digital aerial survey

Figure 30 - September gannet records from digital aerial survey

Figure 31 - September gull records from digital aerial survey

Figure 31 – September gull records from digital aerial survey

Figure 32 - September auk records from digital aerial survey

Figure 32 - September auk records from digital aerial survey

Figure 33 - September cetacean, seal and shark records from digital aerial survey

Figure 33 - September cetacean, seal and shark records from digital aerial survey

Figure 34 - December duck and diver records from digital aerial survey

Figure 34 – December duck and diver records from digital aerial survey

Figure 35 - December fulmar records from digital aerial survey

Figure 35 - December fulmar records from digital aerial survey

Figure 36 - December gannet records from digital aerial survey

Figure 36 - December gannet records from digital aerial survey

Figure 37 - December gull species records from digital aerial survey

Figure 37 - December gull species records from digital aerial survey

Figure 38 - December gull species group records from digital aerial survey

Figure 38 - December gull species group records from digital aerial survey

Figure 39 - December auk records from digital aerial survey

Figure 39 - December auk records from digital aerial survey

Figure 40 - December cetacean records from digital aerial survey

Figure 40 - December cetacean records from digital aerial survey

Figure 41 - February duck and diver records from digital aerial survey

Figure 41 – February duck and diver records from digital aerial survey

Figure 42 - February fulmar records from digital aerial survey

Figure 42 - February fulmar records from digital aerial survey

Figure 43 - February gannet records from digital aerial survey

Figure 43 - February gannet records from digital aerial survey

Figure 44 - February gull species records from digital aerial survey

Figure 44 - February gull species records from digital aerial survey

Figure 45 - February gull species group records from digital aerial survey

Figure 45 - February gull species group records from digital aerial survey

Figure 46 - February auk records from digital aerial survey

Figure 46 – February auk records from digital aerial survey

Figure 47 - February cetacean records from digital aerial survey

Figure 47 – February cetacean records from digital aerial survey

Figure 48 - April shag and diver records from ground-based counts

Figure 48 – April shag and diver records from ground-based counts

Figure 49 - April fulmar records from ground-based counts

Figure 49 – April fulmar records from ground-based counts

Figure 50 - April gannet records from ground-based counts

Figure 50 – April gannet records from ground-based counts

Figure 51 - April gull and skua records from ground-based counts

Figure 51 – April gull and skua records from ground-based counts

Figure 52 - April auk records from ground-based counts

Figure 52 – April auk records from ground-based counts

Figure 53 - May diver and shag records from ground-based counts

Figure 53 – May diver and shag records from ground-based counts

Figure 54 - May fulmar records from ground-based counts

Figure 54 – May fulmar records from ground-based counts

Figure 55 - May gannet records from ground-based counts

Figure 55 – May gannet records from ground-based counts

Figure 56 - May gull records from ground-based counts

Figure 56 – May gull records from ground-based counts

Figure 57 - May auk records from ground-based counts

Figure 57 – May auk records from ground-based counts

Figure 58 - June diver and shag records from ground-based counts

Figure 58 – June diver and shag records from ground-based counts

Figure 59 - June fulmar records from ground-based counts

Figure 59 – June fulmar records from ground-based counts

Figure 60 - June gannet records from ground-based counts

Figure 60 – June gannet records from ground-based counts

Figure 61 - June gull and skua records from ground-based counts

Figure 61 – June gull and skua records from ground-based counts

Figure 62 - June auk records from ground-based counts

Figure 62 – June auk records from ground-based counts

Figure 63 - June cetacean and marine mammal records from ground-based counts

Figure 63 – June cetacean and marine mammal records from ground-based counts

Figure 64 - July shag and diver species records from ground-based counts

Figure 64 – July shag and diver species records from ground-based counts

Figure 65 - July fulmar records from ground-based counts

Figure 65 – July fulmar records from ground-based counts

Figure 66 - July gannet records from ground-based counts

Figure 66 – July gannet records from ground-based counts

Figure 67 - July gull and skua records from ground-based counts

Figure 67 – July gull and skua records from ground-based counts

Figure 68 - July auk records from ground-based counts

Figure 68 – July auk records from ground-based counts

Figure 69 - July cetacean and marine mammal records from ground-based counts

Figure 69 – July cetacean and marine mammal records from ground-based counts

Figure 70 - September diver and cormorant records from ground based counts

Figure 70 – September diver and cormorant records from ground based counts

Figure 71 - September gannet records from ground based counts

Figure 71 - September gannet records from ground based counts

Figure 72 - September gull records from ground based counts

Figure 72 - September gull records from ground based counts

Figure 73 - September auk records from ground based counts

Figure 73 – September auk records from ground based counts

Figure 74 - September shark and seal records from ground based counts

Figure 74 - September shark and seal records from ground based counts

Figure 75 - December duck, diver and cormorant records from ground based counts

Figure 75 – December duck, diver and cormorant records from ground based counts

Figure 76 - December fulmar records from ground based counts

Figure 76 - December fulmar records from ground based counts

Figure 77 - December gull records from ground based counts

Figure 77 – December gull records from ground based counts

Figure 78 - December auk records from ground based counts

Figure 78 – December auk records from ground based counts

Figure 79 - February duck, diver and cormorant records from ground based counts

Figure 79 - February duck, diver and cormorant records from ground based counts

Figure 80 - February fulmar records from ground based counts

Figure 80 - February fulmar records from ground based counts

Figure 81 - February gannet records from ground based counts

Figure 81 - February gannet records from ground based counts

Figure 82 - February gull records from ground based counts

Figure 82 - February gull records from ground based counts

Figure 83 - February auk records from ground based counts

Figure 83 - February auk records from ground based counts

Figure 84 - February seal records from ground based counts

Figure 84 - February seal records from ground based counts

Figure 85 - Loch Roag coverage by 1km squares during the April, June and October 2012 survey visits

Figure 85 - Loch Roag coverage by 1km squares during the April, June and October 2012 survey visits

Figure 86 - Loch Roag coverage by 1km squares during the July 2012 survey visit

Figure 86 - Loch Roag coverage by 1km squares during the July 2012 survey visit

Figure 87 - Loch Roag coverage by 1km squares during the January and February 2013 visits

Figure 87 - Loch Roag coverage by 1km squares during the January and February 2013 visits

Figure 88 - Red-throated diver distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 88 - Red-throated diver distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 89 - Black-throated diver distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 89 - Black-throated diver distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 90 - Great northern diver distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 90 - Great northern diver distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 91 - Slavonian grebe distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 91 - Slavonian grebe distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 92 - Cormorant distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 92 - Cormorant distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 93 - Shag distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 93 - Shag distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 94 - Black guillemot distribution by 1km square and cumulative abundance, April 2012 - February 2013

Figure 94 - Black guillemot distribution by 1km square and cumulative abundance, April 2012 – February 2013

Figure 95 - Common seal and grey seal distribution by 1km square and abundance, October 2012

Figure 95 - Common seal and grey seal distribution by 1km square and abundance, October 2012

Figure 96 - April fulmar density surface model from digital aerial survey

Figure 96 – April fulmar density surface model from digital aerial survey

Figure 97 - April fulmar coefficient of variance map from digital aerial survey

Figure 97 – April fulmar coefficient of variance map from digital aerial survey

Figure 98 - April gannet density surface model from digital aerial survey

Figure 98 - April gannet density surface model from digital aerial survey

Figure 99 - April gannet coefficient of variance map from digital aerial survey

Figure 99 - April gannet coefficient of variance map from digital aerial survey

Figure 100 - April auk density surface model from digital aerial survey

Figure 100 – April auk density surface model from digital aerial survey

Figure 101 - April auk coefficient of variance map from digital aerial survey

Figure 101 – April auk coefficient of variance map from digital aerial survey

Figure 102 - May fulmar density surface model from digital aerial survey

Figure 102 – May fulmar density surface model from digital aerial survey

Figure 103 - May fulmar coefficient of variance map from digital aerial survey

Figure 103 – May fulmar coefficient of variance map from digital aerial survey

Figure 104 - May gannet density surface model from digital aerial survey

Figure 104 – May gannet density surface model from digital aerial survey

Figure 105 - May gannet coefficient of variance map from digital aerial survey

Figure 105 – May gannet coefficient of variance map from digital aerial survey

Figure 106 - May auk density surface model from digital aerial survey

Figure 106 – May auk density surface model from digital aerial survey

Figure 107 - May auk coefficient of variance map from digital aerial survey

Figure 107 – May auk coefficient of variance map from digital aerial survey

Figure 108 - June fulmar density surface model from digital aerial survey

Figure 108 – June fulmar density surface model from digital aerial survey

Figure 109 - June fulmar coefficient of variance map from digital aerial survey

Figure 109 – June fulmar coefficient of variance map from digital aerial survey

Figure 110 - June gannet density surface model from digital aerial survey

Figure 110 – June gannet density surface model from digital aerial survey

Figure 111 - June gannet coefficient of variance map from digital aerial survey

Figure 111 – June gannet coefficient of variance map from digital aerial survey

Figure 112 - June auk density surface model from digital aerial survey

Figure 112 – June auk density surface model from digital aerial survey

Figure 113 - June auk coefficient of variance map from digital aerial survey

Figure 113 – June auk coefficient of variance map from digital aerial survey

Figure 114 - July fulmar density surface model from digital aerial survey

Figure 114 – July fulmar density surface model from digital aerial survey

Figure 115 - July fulmar coefficient of variance map from digital aerial survey

Figure 115 – July fulmar coefficient of variance map from digital aerial survey

Figure 116 - July gannet density surface model from digital aerial survey

Figure 116 – July gannet density surface model from digital aerial survey

Figure 117 - July gannet coefficient of variance map from digital aerial survey

Figure 117 – July gannet coefficient of variance map from digital aerial survey

Figure 118 - July auk density surface model from digital aerial survey

Figure 118 – July auk density surface model from digital aerial survey

Figure 119 - July auk coefficient of variance map from digital aerial survey

Figure 119 – July auk coefficient of variance map from digital aerial survey

Figure 120 - September fulmar density surface model from digital aerial survey

Figure 120 - September fulmar density surface model from digital aerial survey

Figure 121 - September fulmar coefficient of variance map from digital aerial survey

Figure 121 - September fulmar coefficient of variance map from digital aerial survey

Figure 122 - September gannet density surface model from digital aerial survey

Figure 122 - September gannet density surface model from digital aerial survey

Figure 123 - September gannet coefficient of variance map from digital aerial survey

Figure 123 - September gannet coefficient of variance map from digital aerial survey

Figure 124 - September auk density surface model from digital aerial survey

Figure 124 - September auk density surface model from digital aerial survey

Figure 125 - September auk coefficient of variance map from digital aerial survey

Figure 125 - September auk coefficient of variance map from digital aerial survey

Figure 126 - December fulmar density surface model from digital aerial survey

Figure 126 – December fulmar density surface model from digital aerial survey

Figure 127 - December fulmar coefficient of variance map from digital aerial survey

Figure 127 - December fulmar coefficient of variance map from digital aerial survey

Figure 128 - December gannet density surface model from digital aerial survey

Figure 128 - December gannet density surface model from digital aerial survey

Figure 129 - December gannet coefficient of variance map from digital aerial survey

Figure 129 - December gannet coefficient of variance map from digital aerial survey

Figure 130 - December auk density surface model from digital aerial survey

Figure 130 - December auk density surface model from digital aerial survey

Figure 131 - December auk coefficient of variance map from digital aerial survey

Figure 131 - December auk coefficient of variance map from digital aerial survey

Figure 132 - February fulmar density surface model from digital aerial survey

Figure 132 - February fulmar density surface model from digital aerial survey

Figure 133 - February fulmar coefficient of variance map from digital aerial survey

Figure 133 - February fulmar coefficient of variance map from digital aerial survey

Figure 134 - February gannet density surface model from digital aerial survey

Figure 134 - February gannet density surface model from digital aerial survey

Figure 135 - February gannet coefficient of variance map from digital aerial survey

Figure 135 - February gannet coefficient of variance map from digital aerial survey

Figure 136 - February auk density surface model from digital aerial survey

Figure 136 - February auk density surface model from digital aerial survey

Figure 137 - February auk coefficient of variance map from digital aerial survey

Figure 137 - February auk coefficient of variance map from digital aerial survey

Figure 138 - Comparison of coverage, location and number of records for aerial and vantage point surveys on 19 th April 2012. Only records of birds sitting on the water have been included from each dataset for comparability.

Figure 138 – Comparison of coverage, location and number of records for aerial and vantage point surveys on 19th April 2012

Figure 139 - Comparison of coverage, location and number of records for aerial and vantage point surveys on 18 th June 2012. Only records of birds sitting on the water have been included from each dataset for comparability.

Figure 139 – Comparison of coverage, location and number of records for aerial and vantage point surveys on 18th June 2012

Figure 140 - Comparison of coverage, location and number of records for aerial and vantage point surveys on 26 th July 2012. Only records of birds sitting on the water have been included from each dataset for comparability.

Figure 140 – Comparison of coverage, location and number of records for aerial and vantage point surveys on 26th July 2012

Figure 141 - Comparison of coverage, location and number of records for aerial and vantage point surveys on 22 nd September 2012. Only records of birds sitting on the water have been included from each dataset for comparability.

Figure 141 – Comparison of coverage, location and number of records for aerial and vantage point surveys on 22nd September 2012

Figure 142 - Comparison of coverage, location and number of records for aerial and vantage point surveys on 17 th December 2012. Only records of birds sitting on the water have been included from each dataset for comparability.

Figure 142 - Comparison of coverage, location and number of records for aerial and vantage point surveys on 17th December 2012

Figure 143 - April to July guillemot densities from Vantage Point ( VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 143 – April to July guillemot densities from Vantage Point (VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 144 - April to July razorbill densities from Vantage Point ( VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 144 - April to July razorbill densities from Vantage Point (VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 145 - April to July black guillemot densities from Vantage Point ( VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 145 - April to July black guillemot densities from Vantage Point (VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 146 - April to July puffin densities from Vantage Point ( VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 146 - April to July puffin densities from Vantage Point (VP) counts around the Butt of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the four aerial survey transects around the Butt of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 147 - April to July guillemot densities from Vantage Point ( VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 147 - April to July guillemot densities from Vantage Point (VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 148 - April to July razorbill densities from Vantage Point ( VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 148 - April to July razorbill densities from Vantage Point (VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 149 - April to July black guillemot densities from Vantage Point ( VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 149 - April to July black guillemot densities from Vantage Point (VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 150 - April to July puffin densities from Vantage Point ( VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 150 - April to July puffin densities from Vantage Point (VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 151 - April to July auk densities from Vantage Point ( VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 151 - April to July auk densities from Vantage Point (VP) counts on the west coast of Lewis. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between April and July are shown on the right (in blue) for comparison

Figure 152 - September to February auk densities from Vantage Point ( VP) counts on the west coast of Lewis. The majority of records are of black guillemots. The horizontal axis shows the distance from the VP (in any direction) and the 'depth' axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between September and February are shown on the right (in blue) for comparison

Figure 152 – September to February auk densities from Vantage Point (VP) counts on the west coast of Lewis. The majority of records are of black guillemots. The horizontal axis shows the distance from the VP (in any direction) and the ‘depth’ axis shows the actual distance from coast. Auk densities in these distance from coast bands from the corresponding aerial survey transects (5-21) along the west coast of Lewis surveyed between September and February are shown on the right (in blue) for comparison

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