Marine biological survey to establish the distribution and status of ...

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Zostera marina/angustifolia beds on lower shore or infralittoral clean or muddy sand SS.SMp.SSgr.Zmar Distribution Depth range: Bay at An Coroghan, Canna 0 - 2 m; Kilmory Bay, Rum 4 - 6.5 m Total area: Bay at An Coroghan, Canna 0.68 ha; Kilmory Bay, Rum 0.25 ha Description Two small beds of the seagrass Zostera marina were found in the sound (Figure 23). The larger and shallower bed was in the bay at An Coroghan on Canna with a second smaller bed in Kilmory Bay on Rum (Plate 10). In both cases the substratum was fine sand (Figure 24) and clumps of plants were generally rare to frequent. On Canna the highest density of plants was found on the northern edge of the bay. Figure 23 The two seagrass beds situated on opposite sides of the Sound of Canna with close-up inset maps of the bay at An Coroghan on Canna and Kilmory Bay on Rum © Crown Copyright and database right [2012]. All rights reserved. Ordnance survey License number 100017908. This product has been derived in part from material obtained from the UK Hydrographic Office with the permission of the Controller of Her Majesty's Stationery Office and UK Hydrographic Office (www.ukho.gov.uk). NOT TO BE USED FOR NAVIGATION The seagrass plants supported a number of epibiotic species including coralline crusts, the algae Ceramium secundatum and Nitophyllum punctatum, amphipods, the gastropod Lacuna vincta, the anemone Anemonia viridis and stalked jellyfish Lucernariopsis campanulata. The sand had occasional Cerianthus lloydii and Pagurus bernhardus with scattered clumps of filamentous brown algae and Ceramium sp. The green algae Ulva spp. and Enteromorpha spp. were frequent. In Kilmory Bay there were many Arenicola marina burrows and the fanworm Sabella pavonina was noted. 35
Plate 10 Zostera marina seagrass bed in the shallow sublittoral in Kilmory Bay, Rum The infaunal communities at the two sites had a relatively low diversity with mean Shannon- Wiener indices (H') of 2.07 for An Coroghan and 1.38 for Kilmory Bay (Table A2.4, Appendix 2). This compares with a value of 2.63 for a larger and more sheltered bed at Old House Point in Loch Ryan, south-west Scotland. The other infaunal communities in the Sound of Canna had considerably higher diversity. The number of infaunal species recorded from the An Coroghan samples ranged from 11 to 18, with the polychaete Magelona filiformis and the amphipod Corophium crassicorne dominant. The comparable figures for Kilmory Bay were 3 to 8 with low numbers of individuals and no clear dominant species. Whilst the communities had characteristics of the biotopes SS.SSa.IMuSa.FfabMag (An Coroghan) and SS.SSa.IFiSa.NcirBat (Kilmory Bay), they could also be considered to be part of the SS.SSa.IMuSa.EcorEns biotope; this can be regarded as a biotope complex encompassing both FfabMag and NcirBat. Figure 24 Results of particle size analysis of seagrass bed sediment samples, showing the percentage of each sediment category 36
Page 1 and 2: Scottish Natural Heritage Commissio
Page 4 and 5: COMMISSIONED REPORT Summary Marine
Page 6 and 7: Contents Page no. 1 Introduction ..
Page 8 and 9: Page no. Figure 28 Basking shark ho
Page 10 and 11: 1 INTRODUCTION 1.1 Background The S
Page 12 and 13: Rum has a far more complex structur
Page 14 and 15: In 1993 an SNH team conducted remot
Page 16 and 17: Richardson et al. (2004) showed tha
Page 18 and 19: 2 METHODS 2.1 Sampling strategy The
Page 20 and 21: Figure 6 Shallow water video statio
Page 22 and 23: Figure 8 Video stations surveyed in
Page 24 and 25: Each discrete grab sample was empti
Page 26 and 27: Following the survey, the infauna w
Page 28 and 29: Table 2 Biotopes identified in the
Page 30 and 31: Figure 11 2010 survey coverage off
Page 32 and 33: Circalittoral sandy mud (SS.SMu.CSa
Page 34 and 35: Description The distribution of the
Page 36 and 37: Figure 16 Division of the megafauna
Page 38 and 39: Some L. saccharina forest (IR.LIR.K
Page 40 and 41: Rhodophyllis werneri and Scinaia in
Page 42 and 43: Plate 8 A northern sea fan Swiftia
Page 46 and 47: This is consistent with infaunal co
Page 48 and 49: the fan mussels ranged from an esti
Page 50 and 51: Plate 13 A small basking shark in C
Page 52 and 53: Distribution Depth range: 72 - 21
Page 54 and 55: Figure 31 Other species of interest
Page 56 and 57: coverage predictive biotope distrib
Page 58 and 59: 4 DISCUSSION This section presents
Page 60 and 61: Table 4 Summary of the assessment o
Page 62 and 63: The burrowed mud supported langoust
Page 64 and 65: in areas where it is protected from
Page 66 and 67: Table 6 Summary of a preliminary as
Page 68 and 69: 5.2 Future data review and biologic
Page 70 and 71: Ingle, R.W. (1996). Shallow-water c
Page 72 and 73: Appendix 1 Drop-down video and dive
Page 74 and 75: Date Station Time Latitude Longitud
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Date Station Time Latitude Longitud
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Table A1.2 Summary notes (biologica
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Tow Id no Tow Data point Date Tape
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Tow Id no Tow Data point Date A123
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Table A1.3 Summary of sampling unde
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Site No. Date Habitat Id (Site No:H
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Species MCS Code D D 1 _ 2 D D 1 _
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Species MCS Code Suberites ficus C2
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Species MCS Code Cryptopleura ramos
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Species MCS Code Scrupocellaria Y83
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Table A1.6 Species recorded (matrix
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Species MCS Code A 1 2 _ 1 A 1 2 _
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Table A1.7 Species recorded (matrix
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Species MCS Code Dive 1.1 Dive 2.1
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Table A2.1 Positional and depth inf
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Table A2.3 List of taxa identified
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Taxa MCS Code G 01 G 02 G 03 G 04 G
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Taxa MCS Code G 01 G 02 G 03 Diasty
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Taxa MCS Code G 01 Ascidiella sp. Z
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Figure A2.1 Bray-Curtis similarity
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Appendix 3 Macrofaunal and sediment
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Table A3.3 Results of univariate an
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Appendix 4 Photo and video logs - 2
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File Name Subject Site Name Island
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Table A4.2 Drop-down video log, 201
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File Name File size Folder Site No
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File Name File size Folder Site No
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