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

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Plate 8 A northern sea fan Swiftia pallida with a silty hydroid turf on vertical bedrock of the Great Wall of Canna Figure 22 Predicted distribution of northern sea fan biotopes in the Sound of Canna with individual records of Swiftia pallida © 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 Silty bedrock and boulders on the floor of the sound supported occasional S. pallida colonies. Other species that could be identified included the cup coral Caryophyllia smithii, often present in large numbers, dead men’s fingers Alcyonium digitatum, the anemones Parazoanthus anguicomus, Urticina felina and Metridium senile, axinellid sponges including 33
Axinella infundibuliformis and possibly Phakellia ventilabrum, and the boring sponge Cliona celata. There were bryozoan crusts on rock surfaces, probably Parasmittina trispinosa and echinoderms were frequent including Echinus esculentus, Luidia ciliaris, Henricia sp. and occasionally Leptometra celtica. At a few sites where there was a significant tidal stream the jewel anemone Corynactis viridis covered the boulders. White clumps, thought to be colonies of the worm Salmacina dysteri, were frequently seen. Plate 9 Sponges, jewel anemones and bryozoans in the Swiftia pallida CR.HCR.XFa.SwiLgAs biotope on the Great Wall of Canna The cliffs were surveyed in a few places by divers (see Figure 10) and Swiftia pallida was found below about 30 m depth (the CR.HCR.XFa.SwiLgAs biotope was recorded at dive Site 2). The bedrock wall on the east of Sanday (Great Wall of Canna) had many small ledges, overhangs, fissures and crevices. Much of the rock surface was covered with Corynactis viridis (Plate 9) and a bryozoan turf, with Securiflustra securifrons common. There were frequent large colonies of Cliona celata and the hydroid Nemertesia antennina was common. Overhangs had scyphistomae, small hydroids and the anemones Epizoanthus couchii and Parazoanthus anguicomus (a PMF). Sagartia elegans was frequent on the open rock. The European spiny lobster Palinurus elephas, the lobster Homarus gammarus and the edible crab Cancer pagurus were all present. There were several axinellid sponge species from about 25 m downwards. Shallower rock on the cliffs above the Swiftia pallida biotope was dominated by Corynactis viridis with foliose red algae (CR.HCR.XFa.CvirCri) whilst in the areas of cliff exposed to stronger tides, S. pallida was absent and the hydroid Tubularia indivisa was common with C. viridis, sponges, bryozoan turf including Securiflustra securifrons and the white cluster anemone Parazoanthus anguicomus (CR.HCR.XFa.SpAnVt). It is probable that S. pallida is present in deeper water beyond diving depths along these more exposed stretches of cliff, possibly in lower abundance with increasing numbers of sponges (CR.HCR.DpSp). 3.2.5 Seagrass beds The following component biotope of the seagrass beds MPA search feature was recorded in 2010: 34
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 44 and 45: Zostera marina/angustifolia beds on
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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