County Wildife Site Criteria for Cornwall Appendices

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LOWLAND FENS PHTGeneral DescriptionFens are peatlands which receive water and nutrients from the soil, rock and ground water as well asfrom rainfall: they are minerotrophic.Fens can also be described as `poor-fens` or `rich-fens`. Poor-fens, where the water is derived frombase-poor rock such as granites occur mainly in the uplands, or are associated with lowland heaths.They are characterised by short vegetation with a high proportion of bog mosses Sphagnum spp..Rich-fens, are fed by mineral-enriched calcareous waters (pH 5 or more) and are mainly confined tothe lowlands.Fen habitats support a diversity of plant and animal communities. Some can contain up to 550 speciesof higher plants, a third of our native plant species; up to and occasionally more than half the UK`sspecies of dragonflies, several thousand other insect species, as well as being an important habitat fora range of aquatic beetles.National ContextIn intensively farmed lowland areas fens occur less frequently, are smaller in size and more isolatedthan in other parts of Britain. There are, however, exceptions to this. Britain`s largest continuousarea of base-poor fen, the Insh Marshes in the floodplain of the River Spey in Scotland, covers an areaof 300 ha, the calcareous rich fen and the swamp of Broadland covers an area of 3000 ha.Area of PHT in Cornwall (ha): estimated (est) 3110Number of polygons: est 2200The habitat is: Fairly commonDistribution by Administrative DistrictDistrict P K CK R CN NC ΣNumber 249 371 265 393 nk nk est 2200Area (ha) 350 420 210 580 nk nk est 3110Distribution by Natural AreaDistrict Pe Lz CKG BM Cu ΣNumber 187 151 1445 est 136 281 est 2200Area (ha) 270 200 1560 est 830 250 est 3110nk=not knownFor this habitat the threshold is 2.5 haAppendix 4 - Information Relating to Priority Habitat TypesCounty Wildlife Sites Criteria
LOWLAND FENS: SourcesDataset Description Owner Role in Inventory Access NotesAerial photos ofCCCHeld at CCCCornwallAn audit of CulmGrassland inCornwallCounty WildlifeSite filesEN local teamSSSI filesNT site surveyreportsDigital photographstaken in 2000,together with printstaken in 1995/6Can be used toidentify up-to-dateboundaries.Paper Report EN Gives details of everyCulm Grassland in thecounty, much of it toNVC level.Reports held in paperfiles. (1980-1988)Paper information onSSSIsReports on surveys ofNT land. (1979-2001)ERCCISENNTUseful as a back-up toPhase 1 and does holdsome additionalinformation, but it isout-of-date.May hold significantinformation in someareasPhase 1 maps Paper information EN Rather out-of-dateand of variable quality,but does give aninsight into wheremires and swamps ofconservation interestmay be located.Wetland andgrasslandlandcover on GISMaps of wetland,grassland and theirmosaics drawn from acombination ofreferences and API(1996)LOWLAND FENS: CommentsERCCISUseful as a way oflocating possible PHT.ERCCISERCCISENERCCISERCCISERCCISHigh qualityinformation, close toNVCGood qualityinformationGood qualityinformationPoor qualityGood qualityinformationData SourcesWetland and grasslandlandcover on GISPhase 1 mapsThe DefinitionPoorReliability of PHTInterpretationFair to GoodOverall AssessmentGoodCommentA combination of these two e sources was used to generate theFens layer. The GIS layer incorporates a wide range of thesources listed above.CommentThere are considerable problems. The separation of Fens PHTfrom both Purple Moor Grass and Rush Pastures PHT and wetLowland Heathland PHT is complicated by the fact that thedefinitions are not compatible. Moreover, the definition is toowoolly to be interpreted in a consistent way.ExplanationWe have a reasonably clear idea of what constitutes a Fen. Theinterpretation is good so long as the problem of the overlapwith the two other PHTs mentioned above is ignored.CommentsThe map of the Fens PHT in the Culm NA we assess as verygood, the rest of the county we assess as good, accepting thelimitations discussed above.Appendix 4 - Information Relating to Priority Habitat TypesCounty Wildlife Sites Criteria
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HeadingCounty Wildife SiteCriteria
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PENWITHP/K 1P/K 2P3Hayle Estuary an
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K17K18K19K20K21K22K23K24K25K26K/P 2
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R5R6R7R8R9R10R11R12R13R 15.2R/CK 16
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CN/NC 8CN/NC 9CN 10CN 11CN 12CN 13C
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NC/CN 7 NNC/CN 7 SNC/CN 8NC/CN 9NC
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Appendix 2The Selection of Local Si
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However, it is not a significant co
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Where any area has less than ½ of
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West Looe to Watergatehttp://cwtdev
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Appendix 4Information Relating to P
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Upland flushes, fens and swamps PHT
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COASTAL SALTMARSH: SourcesDataset D
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COASTAL SAND DUNES: SourcesDataset
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COASTAL VEGETATED SHINGLE: SourcesD
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ESTUARINE ROCKY HABITATS PHTGeneral
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INTERTIDAL MUDFLATS PHTGeneral Desc
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MAERL BEDS PHTGeneral DescriptionMa
Page 38 and 39: MUD HABITATS IN DEEP WATER PHTGener
Page 40 and 41: Sabellaria alveolata REEFS: Sources
Page 42 and 43: SALINE LAGOONS: SourcesDataset Desc
Page 44 and 45: SEAGRASS BEDS: SourcesDataset Descr
Page 46 and 47: SUBTIDAL SANDS AND GRAVELS PHTGener
Page 48 and 49: LOWLAND MIXED DECIDUOUS WOODLAND PH
Page 50 and 51: LOWLAND MIXED DECIDUOUS WOODLAND: C
Page 52 and 53: TRADITIONAL ORCHARDS PHTGeneral Des
Page 54 and 55: UPLAND MIXED ASHWOODS PHTGeneral De
Page 56 and 57: UPLAND MIXED ASHWOODS: CommentsData
Page 58 and 59: UPLAND OAKWOOD PHTGeneral Descripti
Page 60 and 61: UPLAND OAKWOOD: CommentsData Source
Page 62 and 63: WET WOODLAND PHTGeneral Description
Page 64 and 65: WET WOODLAND: CommentsData SourcesA
Page 66 and 67: WOOD-PASTURE AND PARKLAND PHTGenera
Page 68 and 69: The National DefinitionGoodReliabil
Page 70 and 71: ARABLE FIELD MARGINS PHTGeneral Des
Page 72 and 73: COASTAL AND FLOODPLAIN GRAZING MARS
Page 74 and 75: LOWLAND MEADOWS: SourcesDataset Des
Page 76 and 77: LOWLAND CALCAREOUS GRASSLAND PHTGen
Page 78 and 79: LOWLAND CALCAREOUS GRASSLAND: Comme
Page 80 and 81: LOWLAND DRY ACID GRASSLAND: Sources
Page 82 and 83: LOWLAND HEATHLAND PHTGeneral Descri
Page 84 and 85: LOWLAND HEATHLAND: CommentsData Sou
Page 86 and 87: UPLAND HEATHLAND: SourcesDataset De
Page 90 and 91: PURPLE MOOR GRASS AND RUSH PASTURES
Page 92 and 93: PURPLE MOOR GRASS AND RUSH PASTURES
Page 94 and 95: REEDBEDS: SourcesDataset Descriptio
Page 96 and 97: UPLAND FLUSHES, FENS AND SWAMPS: po
Page 98 and 99: BLANKET BOG: SourcesDataset Descrip
Page 100 and 101: EUTROPHIC STANDING WATER PHTGeneral
Page 102 and 103: MESOTROPHIC LAKES PHTGeneral Descri
Page 104 and 105: OLIGOTROPHIC AND DYSTROPHIC LAKES P
Page 106 and 107: PONDS PHTGeneral DescriptionThis PH
Page 108 and 109: RIVERS PHTGeneral DescriptionThe Ri
Page 110 and 111: OPEN MOSAIC HABITATS ON PREVIOUSLY
Page 112 and 113: This appendix provides a more detai
Page 114 and 115: LOCAL ANCIENT WOODLANDSGeneral Desc
Page 116 and 117: LOCAL ANCIENT WOODLANDS: CommentsDa
Page 118 and 119: LOCAL MIXED ASHWOODS: SourcesDatase
Page 120 and 121: LOCAL PARKLANDSGeneral DescriptionT
Page 122 and 123: The National DefinitionGoodReliabil
Page 124 and 125: LOCAL BOUNDARIES: SourcesDataset De
Page 126 and 127: LOCAL FLOODPLAIN GRASSLANDS: Source
Page 128 and 129: LOCAL LOWLAND MEADOWSGeneral Descri
Page 130 and 131: LOCAL LOWLAND MEADOWS: CommentsData
Page 132 and 133: UPLAND DRY ACID GRASSLAND: SourcesD
Page 134 and 135: LOCAL PONDSGeneral DescriptionThe n
Page 136 and 137: Appendix 6Information Relating to S
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Monotropa hypopitysMuscari neglectu
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FRESHWATER ALGAE, FUNGI AND LICHENS
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BRYOPHYTESThese criteria are direct
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*Calliergon sarmentosum 50**Calypog
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Pottia commutata = Microbryum daval
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Moths:Acronicta psi Grey DaggerAcro
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BUTTERFLIESBAP species and butterfl
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DRAGONFLIES AND DAMSELFLIES (ODONAT
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FISHGainey, in CISFBR (2009), state
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Sites with significant Amphibian as
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Turdus torquatus torquatus Ring Ouz
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Table of Thresholds for wintering w
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Other MammalsCornwall BAP Priority
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Shirt, D.B. (Ed.) (1987) British Re
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Tick when Process CompleteProtocol
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Site Contraction/DeletionDetails of
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Heading
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County Wildife Site Criteria for Cornwall Appendices

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