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Exmoor Important Plant Area: Identifying qualifying feature boundaries using increased biological information resources Beth Halski – Biological Data and GIS Officer 29/06/2016 Introduction Exmoor IPA is comprised of 3 main components: • Exmoor Oakwoods – identified for Crit B lichens: (G1) Broadleaved deciduous woodland: oceanic woodland • Exmoor Hills and Coast - identified for vascular plants Crit A (sorbus species (Aiii)); Crit B (B3) lichens of Rock cliffs, ledges and shores including the supralittoral; (F4) temperate shrub heath; and Crit C habitat (oakwoods and heaths) • River Barle – identified for lichen criteria A Collema dichotomum (Aii); Criteria B lichens of (A1) Littoral zone of inland surface water bodies: rivers and streams Please see Table 1 for detailed breakdown of qualifying features. The main extent of Exmoor IPA falls within the Exmoor National Park boundary, with an extra core component found to the east within the Quantock Hills AONB. Each component has several qualifying features, and several areas are identified for more than one criterion e.g. Watersmeet (identified for Crit A & B vascular interest, and Crit B lichen interest), indeed the same areas are in some instances are covered by 3 or 4 different criteria. Due to complexity of the Exmoor IPA, features have been mapped individually where possible and should be viewed in conjunction with the Exmoor IPA overview map to best understand the full importance of the site. Background - IPA Qualifying features • Criterion A – the site holds significant populations of one or more species that are of global or European conservation concern- there are four categories of criterion A: ○ A (i) globally threatened plants ○ A (ii) European threatened plants ○ A (iii) Other threatened endemics ○ A (iv) Other threatened near endemics • Criterion B – the site has an exceptionally rich flora in a European context in relation to its biogeographic zone. Criterion B is defined as a site that contains a high number of species within a range of defined habitats. The unit of comparison for assessing species richness is EUNIS level 2 Habitat Level (e.g. G1 = Broadleaved Woodland) • Criterion C – the site is an outstanding example of a habitat type of global or European plant conservation and botanical importance ○ C(i) all sites known, thought or inferred to contain 5% or more of the national area of a priority threatened habitats can be selected as IPAs, or a total of 20-60% of the national resource, whichever is most appropriate ○ C(ii) all sites known, thought, or inferred to contain 5% or more of the national area of a threatened habitat can be selected or the 5 ‘best’ sites, whichever is most appropriate For more information of qualifying features and the IPA identification process please see: Hutchinson, N., Dines, T. (2009) Important Plant Areas in the UK: Technical report. Plantlife International Table 1: Exmoor component sites and qualifying features Taxono Component mic IPA name Component site 1 site 2 group Grid ref Criterion A Criterion B (EUNIS Cat) Criterion C Exmoor IPA Exmoor Hills and Combe Martin Lichens SS895495 (B3) Rock cliffs, ledges and Coast - Hurlstone shores including the supralittoral; Point (F4) temperate shrub heath Exmoor IPA Exmoor Hills and Hunter's Inn, Vascular SS655485 SORBUS (G1) Broadleaved deciduous Coast Woody Bay, plants SS675495 HOTSPOT: woodlands Watersmeet, SS745485 Sorbus Neck Wood subcuneata (Aiii), Sorbus vexans (Aiii) Exmoor IPA Exmoor Hills and Exmoor and Habitat Exmoor & Quantock oakwoods: Old Coast Quantock sessile oak woods with Ilex and Oakwoods; Blechnum in the British Isles (Cii); Exmoor Heaths Exmoor Heaths: European dry heaths (Cii); Northern Atlantic wet heaths with Erica tetralix (Cii) Exmoor IPA Barle Valley SS850349 - (G1) Broadleaved deciduous Exmoor Oakwoods Woods Lichens 915284 woodland: oceanic woodland Exmoor IPA (G1) Broadleaved deciduous Exmoor Oakwoods Doctor's Wood Lichens SS674460 woodland: oceanic woodland Exmoor IPA (G1) Broadleaved deciduous Exmoor Oakwoods Horner Woods Lichens SS897454 woodland: oceanic woodland Exmoor IPA (G1) Broadleaved deciduous Exmoor Oakwoods Watersmeet Lichens SS745485 woodland: oceanic woodland Exmoor IPA Collema (A1) Littoral zone of inland dichotomum surface water bodies: rivers and River Barle River Barle Lichens SS7937 (Aii) streams Map 2 – Exmoor IPA – River Barle component Table 2 – River Barle core component qualifying features Component IPA name site 1 Taxon Grid ref Criterion A Criterion B Exmoor IPA Collema (A1) Littoral zone of inland dichotomum surface water bodies: rivers River Barle Lichens SS7937 (Aii) and streams • Criterion A: Collema dichotomum records downloaded from NBN Gateway and mapped (post 1987 records at 6 fig resolution). Only the most recent record for each unique grid ref has been mapped. Data from 2 sources (Devon Biodiversity Records Centre (27 records), JNCC (2 records)) fell within the River Barle area: Table 3 – Collema dichotomum records – post 1987 6 fig resolution taxonName gridReference Year Site Name Organisation Name Collema dichotomum SS796369 1999 Devon Biodiversity Records Centre Collema dichotomum SS858339 2002 Devon Biodiversity Records Centre Collema dichotomum SS863312 1999 Devon Biodiversity Records Centre Collema dichotomum SS863313 2002 Devon Biodiversity Records Centre Collema dichotomum SS875305 2002 Devon Biodiversity Records Centre Collema dichotomum SS877305 2002 Devon Biodiversity Records Centre Collema dichotomum SS877307 2002 Devon Biodiversity Records Centre Collema dichotomum SS883293 2002 Devon Biodiversity Records Centre Collema dichotomum SS883298 2002 Devon Biodiversity Records Centre Collema dichotomum SS884293 2002 Devon Biodiversity Records Centre Collema dichotomum SS884296 2002 Devon Biodiversity Records Centre Collema dichotomum SS885298 2002 Devon Biodiversity Records Centre Collema dichotomum SS885299 2002 Devon Biodiversity Records Centre Collema dichotomum SS886293 2002 Devon Biodiversity Records Centre Collema dichotomum SS887293 2002 Devon Biodiversity Records Centre Collema dichotomum SS888294 2002 Devon Biodiversity Records Centre Collema dichotomum SS889295 2002 Devon Biodiversity Records Centre Collema dichotomum SS891294 2002 Devon Biodiversity Records Centre Collema dichotomum SS891295 2002 Devon Biodiversity Records Centre Collema dichotomum SS896292 2002 Devon Biodiversity Records Centre Collema dichotomum SS897293 2002 Devon Biodiversity Records Centre Collema dichotomum SS899293 2002 Devon Biodiversity Records Centre Collema dichotomum SS901292 2002 Devon Biodiversity Records Centre Collema dichotomum SS910286 2002 Devon Biodiversity Records Centre Collema dichotomum SS913283 2002 Devon Biodiversity Records Centre Collema dichotomum SS913287 2002 Devon Biodiversity Records Centre Collema dichotomum SS915285 2002 Devon Biodiversity Records Centre Collema dichotomum SS796369 1996 2 Barle Joint Nature Conservation Committee Collema dichotomum SS863312 1996 4 Barle Joint Nature Conservation Committee • Criterion B: Polygon to represent Criterion B lichens follows River Barle SSSI Map 2 Map 3 – Exmoor IPA – Exmoor Oakwoods Core component sites Table 4 – Exmoor Oakwoods core component qualifying features Component Component Grid IPA name site 1 site 2 Taxon ref Criterion B Exmoor IPA SS850 349 - Exmoor Barle Valley 9152 (G1 )Broadleaved deciduous Oakwoods Woods Lichens 84 woodland: oceanic woodland Exmoor IPA Exmoor Doctor's SS674 (G1) Broadleaved deciduous Oakwoods Wood Lichens 460 woodland: oceanic woodland Exmoor IPA Exmoor Horner SS897 (G1) Broadleaved deciduous Oakwoods Woods Lichens 454 woodland: oceanic woodland Exmoor IPA Exmoor SS745 (G1) Broadleaved deciduous Oakwoods Watersmeet Lichens 485 woodland: oceanic woodland The Exmoor Oakwoods core component follows 4 clearly defined woodland areas. Although these areas were identified as part of the Lichen IPA network carried out by Bryan Edwards and the British Lichen Society (BLS), no polygons were mapped by BLS. Therefore areas have been mapped in house and follow protected network boundaries where possible. a) Horner Woods: Includes Horner wood and adjacent woodland, mapped using woodland features of OS basemap for guidance. This area also falls within the North Exmoor SSSI, Horner & Dunkery NR, Hawkcombe NR. Site owned by National Trust b) Watersmeet: Polygon follows Watersmeet SSSI (identified as a lichen SSSI by BLS) c) Doctor’s wood: Polygon follows OS wood features (Doctor’s wood is a small area to the NE of Watersmeet, a lot of lichen surveys have also been carried out at adjacent Chubhill Wood, Kipscombe enclosure so these have also been included). d) Barle Valley Woods: Polygon follows Barle Valley SSSI (identified as a lichen SSSI by BLS) Map 3 Exmoor Hills & Coast core component sites Table 5 – Exmoor Hills & Coast core component qualifying features IPA Component Component Taxon name site 1 site 2 group Grid ref Criterion A Criterion B Criterion C Exmoor Exmoor Combe Lichens SS895495 (B3) Rock cliffs, IPA Hills and Martin - ledges and shores Coast Hurlstone including the Point supralittoral; (F4) temperate shrub heath Exmoor Exmoor Hunter's Inn, Vascula SS655485 SORBUS (G1) Broadleaved IPA Hills and Woody Bay, r plants SS675495 HOTSPOT: deciduous Coast Watersmeet, SS745485 Sorbus woodlands Neck Wood subcuneata (Aiii), Sorbus vexans (Aiii) Exmoor Exmoor Exmoor and Habitat Exmoor & Quantock IPA Hills and Quantock oakwoods: Old sessile Coast Oakwoods; oak woods with Ilex Exmoor and Blechnum in the Heaths British Isles (Cii);