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

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Rhodophyllis werneri and Scinaia interrupta with encrusting calcareous and dark red algae on the pebbles. Plate 6 Live maerl medallions (pink), interspersed with maerl gravel and red algae in the grab sample taken at Guirdil (G22), Sound of Canna Eighty-six taxa were recorded from the grab sample and a diversity index (H’) of 3.49 was calculated (Table A2.4, Appendix 2). The squat lobster Galathea intermedia was the dominant species, with 87 individuals recorded. The chiton Leptochiton asellus was common (22 individuals); two other chiton species were also found (Leptochiton cancellatus and Callochiton septemvalvis). Figure 21 Results of the particle size analysis of the maerl sediment sample taken at grab station G22, showing the percentage of each sediment category 31
Plate 7 Scattered maerl medallions amongst pebbles and cobbles at the southern edge of the Guirdil maerl bed, Sound of Canna Live, pink maerl medallions scattered on coarse mixed seabed sediments Other frequent species included the amphipods Iphimedia nexa, Ceradocus semiserratus, Maera othonis, Phtisica marina and an unidentified gammarid, the brittlestar Amphipholis squamata and the prawn Eualus pusiolus. The most numerous polychaetes found were Sphaerosyllis bulbosa, Aonides paucibranchiata, Polycirrus medusa, Trypanosyllis coeliaca, Hydroides norvegica and an unidentified polynoid. 3.2.4 Northern sea fan and deep sponge communities The following component biotopes and species of the northern sea fan and deep sponge communities MPA search feature were recorded in 2010: Caryophyllia smithii and Swiftia pallida on circalittoral rock CR.MCR.EcCr.CarSwi Mixed turf of hydroids and large ascidians with Swiftia pallida and Caryophyllia smithii on weakly tide-swept circalittoral rock CR.HCR.XFa.SwiLgAs Northern sea fan Swiftia pallida Distribution Depth range: CarSwi 46 - 220 m; SwiLgAs 24 - 34 m (limit of single dive record) Total area: 141 ha Description The northern sea fan Swiftia pallida (Plate 8) was found on boulders and patches of bedrock on muddy sediment in deep water (CR.MCR.EcCr.CarSwi), and on steep and vertical rock (CR.HCR.XFa.SwiLgAs). The main area of boulders with Swiftia (CR.MCR.EcCr.CarSwi) was off the eastern end of Sanday, with smaller boulder piles scattered throughout the area (Figure 22). Sublittoral cliffs around the east and south of Sanday and off An t-Each on the north-east of Canna were only partially surveyed. S. pallida was present at three locations around Sanday and is likely to be more widely distributed on these cliffs. It was reported from An t-Each by local divers although none was found during the survey. 32
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 42 and 43: Plate 8 A northern sea fan Swiftia
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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