River Roe and Tributaries

Site of Special Scientific Interest · 54.9853, -6.9275

Open in the interactive map →

Also within

Londonderry County Binevenagh Scenic AreaSperrin Scenic Area

Habitats

Atlantic oak wood, Fast flowing river and stream

Birds & fish recorded

Fish

SpeciesSeason
Atlantic salmon Passage
Atlantic salmon Spawning
Atlantic salmon Unknown
European eel Passage
European eel Spawning
River lamprey Passage
River lamprey Spawning
Sea lamprey Passage
Sea lamprey Spawning
Sea trout Passage
Sea trout Spawning

Description

River Roe and Tributaries Atlantic Salmon, otter River, oakwood The area is of special scientific interest because of the physical features of the river and its associated riverine flora and fauna. The River Roe and Tributaries ASSI includes the River Roe and its tributaries the Curly River, the Gelvin River, the Bovevagh River and its tributary the Altahullion Burn, the Wood Burn, the Owenbeg River and its tributary the Clogherna Burn, the Owenrigh River, the Black Burn and its tributary the Currawable Burn and the Owenalena River. In total, the area encompasses approximately 87km of watercourse and is notable for the physical diversity and naturalness of the banks and channels, especially in the upper reaches, and the richness and naturalness of its plant and animal communities, in particular the population of Atlantic salmon Salmo salar, which is of international importance and in the extent of Upland oakwood present. Atlantic salmon Salmo salar is widely distributed in the north Atlantic Ocean. Within Europe, the species ranges from Portugal in the south to Sweden and Finland in the north. However, numbers are declining and the salmon population of the United Kingdom comprises a significant proportion of the total European stock. Although the species is still widespread in the UK, being found in several hundred rivers many of which have adult runs in excess of 1000, the latest estimates of the UK spawning population are approximately 50% down on the ten-year average. It is estimated that the number of returning salmon entering the river system included within the ASSI is in excess of 4,000, which is 8% of the Northern Ireland spawning population and making the River Roe and Tributaries one of the most important salmon rivers in the British Isles. Recent micro-satellite DNA analysis of stocks within the Foyle area Booth, 2003 has provided evidence for population differentiation within the River Roe catchment. The main run of fish occurs during the summer months with significant numbers also entering in the autumn. The River Roe and its tributaries are among the most productive rivers within the Foyle area while the typical timing of spawning is later than most other rivers within the Foyle area, typically occurring from mid/late December to the end of January. The River Roe also has a considerable run of migratory sea trout. The fish community reflects the extent and diversity of the river system. As well as salmonids, which include brown trout Salmo trutta and Atlantic salmon Salmo salar, the fast-flowing waters support stone loach Barbatula barbatula, minnow Phoxinus phoxinus, eel Anguilla anguilla and 3-spined stickleback Gasterosteus aculeatus. Sea lamprey Petromyzon marinus are also known to migrate into the lower reaches of the River Roe, where the flow is less dynamic, to spawn. Downstream sections also contain euryhaline marine species such as flounder Platichthys flesus. Such an abundant fish resource attracts predators, with otter Lutra lutra signs, in the form of spraints, found along lhe whole length of the River Roe and its main tributaries but occuring most frequently in the upper reaches of these watercourses. The area is also important as a river habitat. In their upper catchments, the tributaries are all fast-flowing spate rivers with dynamic flow regimes, characterised by sequences of riffle and run with occasional cascades, water falls and deep pools. Although the banks along some stretches have been modified, the channel is natural and composed of mixed substrate of boulder, cobble, gravel and pebble with scattered sections of bedrock and sandy deposits. Cobble side and point bars are occasional features. At the upper end of the River Roe and along its tributaries, the aquatic flora reflects the highly acidic character of the water, with mosses such as river feather moss Brachythecium rivulare, claw brook moss Hygrohypnum ochraceum and yellow fringe moss Racometrium aciculare and St Winifrid's moss Chiloscyphus polyanthos and the liverwort star headed liverwort Marchantia polymorpha occurring on stabilised boulders and rocks. In the middle reach the channel vegetation is characterised by greater water moss Fontillalis antipyretica while in lower reaches of the River Roe where the flow is less dynamic the bryophyte community is generally replaced by beds of stream water crowfoot Ranunculus peniciliatus ssp. peniculatus in the channel and reed canary grass Phalaris arundinacea along the banks. The river chmmel of the River Roe and its tributaries has a tree fringe along a large proportion of its length. Occasionally this fringe widens out up the valley sides to form discreet woodland blocks. In total there is more than 138ha of fragmented woodland within the site. Marginal woodland is very important to the river and its wildlife. It helps to stabilise the river bank and regulate the local climate, while submerged roots create a refuge for fish. Many of the insects and other invertebrates associated with the woodland provide food for fish. The main woodland blocks are predominantly Upland Oak Wood which is acidic in nature. It can have a mixed canopy comprised of sessile oak Quercus petraea, downy birch Betula pubescens, hazel Corylus aveliana, ash Fraxinus excelsior, alder Alnus glutinosa and willows Salix spp., in addition to introduced species such as beech Fagus sylvatica and sycamore Acer pseudoplatanus. Shrubs include hawthorn Crataegus monogyna, holly Ilex aquifolium and rowan Sorbus aucuparia. The ground cover is very variable. Grasses are dominant where grazing is heavy. Where the wood is less disturbed, species include wood sorrel Oxalis acetosella, herb Robert Geranium robertianum, pignut Conopodium majus, common dog violet Viola riviniana and great wood rush Luzula sylvatica growing with taller ferns and thickets of bramble Rubus fruticosus agg. In some locations where the conditions are particularly acidic bilberry Vaccinium myrtillus forms a low field layer over a moss carpet. https://www.daera-ni.gov.uk/publications/river-roe-tributaries-assi

Species mentioned

English name
search for this in other sites		 Latin name
search with Google		 IUCN / Red List Type Family
Phalacrocorax aristotelis Not listed in GB list bird phalacrocoracidae
otter Lutra lutra LC carnivore mustelidae
eel Anguilla anguilla CR fish anguillidae
stone loach Barbatula barbatula LC fish nemacheilidae
three spined stickleback Gasterosteus aculeatus LC fish gasterosteidae
minnow Phoxinus phoxinus LC fish cyprinidae
Atlantic salmon Salmo salar EN fish salmonidae
brown trout Salmo trutta LC fish salmonidae
reed canary grass Phalaris arundinacea LC grass poaceae
pignut Conopodium majus LC herb apiaceae
herb Robert Geranium robertianum LC herb geraniaceae
wood sorrel Oxalis acetosella LC herb oxalidaceae
bramble Rubus fruticosus agg. Not listed in GB list herb rosaceae
common dog violet Viola riviniana LC herb violaceae
sea lamprey Petromyzon marinus LC lamprey petromyzontidae
St Winifrid's Moss Chiloscyphus polyanthos LC liverwort jungermanniales
river feather moss Brachythecium rivulare LC moss hypnales
claw brook moss Hygrohypnum ochraceum Not listed in GB list moss hypnales
yellow fringe moss Racometrium aciculare Not listed in GB list moss grimmiales
great wood rush Luzula sylvatica LC rush juncaceae
hawthorn Crataegus monogyna LC shrub rosaceae
billberry Vaccinium myrtillus LC shrub ericaceae
sycamore Acer pseudoplatanus Not listed in GB list tree aceraceae
alder Alnus glutinosa LC tree salicaceae
downy birch Betula pubescens LC tree betulaceae
beech Fagus sylvatica LC tree fabiaceae
ash Fraxinus excelsior LC tree oleaceae
holly Ilex aquifolium LC tree aquifoliaceae
sessile or durmast oak Quercus petraea LC tree fagaceae
rowan Sorbus aucuparia LC tree rosaceae

Plant communities

A9 — Fast flowing river and stream, Marginal and inundation, Pond ditch and canal, Sluggish river and stream

Potamogeton natans community

Schoenoplectus lacustris, Juncus bulbosus, Sparganium angustifolium, Sparganium erectum, Sparganium minimum, Alisma plantago-aquatica, Lobelia dortmanna, Equisetum fluviatile, Myriophyllum alterniflorum, Elodea canadensis, Lemna minor, Lemna trisulca, Nymphaea alba, Callitriche platycarpa, Callitriche stagnalis, Littorella uniflora, Potamogeton natans, Ranunculus trichophyllus, Glyceria fluitans, Chara subspinosa

A14 — Fast flowing river and stream

Myriophyllum alterniflorum community

Isolepis fluitans, Juncus bulbosus, Fontinalis antipyretica, Lobelia dortmanna, Equisetum fluviatile, Myriophyllum alterniflorum, Lemna minor, Callitriche stagnalis, Littorella uniflora, Potamogeton filiformis, Potamogeton gramineus, Potamogeton natans, Ranunculus peltatus, Chara spp., Nitella hyalina

A17 — Chalk river and stream, Fast flowing river and stream

Ranunculus penicillatus ssp. pseudofluitans community

Berula erecta, Nasturtium officinale, Elodea canadensis, Lemna minor, Callitriche stagnalis, Veronica beccabunga, Polygonum amphibium, Polygonum hydropiper, Potamogeton crispus, Potamogeton pectinatus, Ranunculus penicillatus ssp. pseudofluitans

A18 — Fast flowing river and stream

Ranunculus fluitans community

Fontinalis antipyretica, Fontinalis squamosa var. curnowii, Myriophyllum alterniflorum, Myriophyllum spicatum, Elodea canadensis, Mentha aquatica, Lemna gibba, Lemna minor, Potamogeton perfoliatus, Ranunculus fluitans, Glyceria fluitans, Phalaris arundinacea

W10 — Atlantic oak wood, Lowland dry oak and birch wood, Lowland mixed oak and ash wood, Wood pasture

Quercus robur-Pteridium aquilinum-Rubus fruticosus woodland

Hedera helix, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Carpinus betulus, Corylus avellana, Fagus sylvatica, Castanea sativa, Quercus hybrid, Quercus petraea, Quercus robur, Tilia cordata, Tilia x europaea, Fraxinus excelsior, Larix decidua, Pinus nigra, Pinus sylvestris, Pseudotsuga menziesii, Malus sylvestris, Prunus avium, Sorbus aucuparia, Alnus glutinosa, Populus tremula, Taxus baccata, Ulmus glabra, Sambucus nigra, Viburnum lantana, Viburnum opulus, Rhododendron ponticum, Vaccinium myrtillus, Cytisus scoparius, Ulex europaeus, Ligustrum vulgare, Crataegus laevigata, Crataegus monogyna, Prunus spinosa, Carex sylvatica, Juncus effusus, Luzula multiflora, Luzula pilosa, Luzula sylvatica, Mnium hornum, Plagiomnium rostratum, Plagiomnium undulatum, Ceratodon purpureus, Dicranella heteromalla, Dicranoweisia cirrata, Dicranum scoparium, Amblystegium serpens, Brachythecium rutabulum, Eurhynchium striatum, Hypnum cupressiforme, Isothecium myosuroides, Kindbergia praelonga, Plagiothecium denticulatum, Plagiothecium undulatum, Pseudoscleropodium purum, Pseudotaxiphyllum elegans, Thuidium tamariscinum, Atrichum undulatum, Polytrichum formosum, Lophocolea bidentata, Pellia epiphylla, Narcissus pseudonarcissus, Aegopodium podagraria, Anthriscus sylvestris, Conopodium majus, Heracleum sphondylium, Sanicula europaea, Jacobaea vulgaris, Solidago virgaurea, Lonicera periclymenum, Silene dioica, Stellaria holostea, Stellaria media agg., Euphorbia amygdaloides, Mercurialis perennis, Corydalis claviculata, Geranium robertianum, Ajuga reptans, Glechoma hederacea, Lamiastrum galeobdolon, Stachys sylvatica, Teucrium scorodonia, Hyacinthoides non-scripta, Chamerion angustifolium, Circaea lutetiana, Oxalis acetosella, Digitalis purpurea, Veronica chamaedrys, Rumex acetosa, Rumex sanguineus, Lysimachia nemorum, Lysimachia nummularia, Primula vulgaris, Anemone nemorosa, Ficaria verna, Ranunculus repens, Fragaria vesca, Potentilla sterilis, Rosa canina, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Galium odoratum, Galium saxatile, Melanpyrum pratense, Urtica dioica, Viola riviniana, Agrostis capillaris, Anthoxanthum odoratum, Arrhenatherum elatius, Brachypodium sylvaticum, Bromopsis ramosa, Dactylis glomerata, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Holcus lanatus, Holcus mollis, Melica uniflora, Milium effusum, Poa nemoralis, Poa trivialis, Blechnum spicant, Pteridium aquilinum, Dryopteris borreri, Dryopteris dilatata, Dryopteris filix-mas, Thelypteris limbosperma, Athyrium filix-femina

W11 — Altantic hazel wood, Atlantic oak wood, Caledonian forest, Upland birch wood, Wood pasture

Quercus petraea-Betula pubescens-Oxalis acetosella woodland

Acer campestre, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Fagus sylvatica, Quercus hybrid, Quercus petraea, Quercus robur, Fraxinus excelsior, Larix decidua, Sorbus aucuparia, Calluna vulgaris, Erica cinerea, Juniperus communis, Vaccinium myrtillus, Cytisus scoparius, Crataegus monogyna, Rubus saxatilis, Carex pilulifera, Luzula campestris, Luzula multiflora, Luzula pilosa, Luzula sylvatica, Mnium hornum, Plagiomnium affine, Plagiomnium undulatum, Dicranum majus, Dicranum scoparium, Cirriphyllum piliferum, Eurhynchium striatum, Hylocomium splendens, Hypnum cupressiforme, Isothecium myosuroides, Kindbergia praelonga, Loeskeobryum brevirostre, Plagiothecium denticulatum, Plagiothecium undulatum, Pleurozium schreberi, Pseudoscleropodium purum, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Thuidium tamariscinum, Atrichum undulatum, Polytrichum commune, Polytrichum formosum, Polytrichum longisetum, Sphagnum capillifolium, Diplophyllum albicans, Lophocolea bidentata, Plagiochila asplenioides, Plagiochila spinulosa, Angelica sylvestris, Conopodium majus, Campanula rotundifolia, Lonicera periclymenum, Succisa pratensis, Cerastium fontanum, Stellaria holostea, Pyrola minor, Vaccinium vitis-idaea, Lathyrus montanus, Geranium robertianum, Hypericum pulchrum, Ajuga reptans, Teucrium scorodonia, Convallaria majalis, Hyacinthoides non-scripta, Oxalis acetosella, Digitalis purpurea, Veronica chamaedrys, Veronica officinalis, Rumex acetosa, Lysimachia nemorum, Primula vulgaris, Trientalis europaea, Anemone nemorosa, Ranunculus acris, Ranunculus repens, Potentilla erecta, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Galium saxatile, Melanpyrum pratense, Viola riviniana, Agrostis capillaris, Agrostis vinealis, Anthoxanthum odoratum, Brachypodium sylvaticum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Holcus lanatus, Holcus mollis, Poa pratensis, Poa trivialis, Blechnum spicant, Pteridium aquilinum, Dryopteris borreri, Dryopteris dilatata, Dryopteris filix-mas, Thelypteris limbosperma, Athyrium filix-femina

W16 — Atlantic oak wood, Lowland dry oak and birch wood, Wood pasture

Quercus spp.-Betula spp.-Deschampsia flexuosa woodland

Hedera helix, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Fagus sylvatica, Castanea sativa, Quercus hybrid, Quercus petraea, Quercus robur, Pinus sylvestris, Sorbus aria, Sorbus aucuparia, Populus tremula, Calluna vulgaris, Erica cinerea, Rhododendron ponticum, Vaccinium myrtillus, Ulex europaeus, Ulex gallii, Frangula alnus, Crataegus monogyna, Luzula sylvatica, Mnium hornum, Orthodontium lineare, Pohlia nutans, Campylopus flexuosus, Campylopus pyriformis, Dicranella heteromalla, Dicranodontium denudatum, Dicranoweisia cirrata, Dicranum fuscescens, Dicranum scoparium, Leucobryum glaucum, Hypnum cupressiforme, Hypnum jutlandicum, Isothecium myosuroides, Kindbergia praelonga, Plagiothecium denticulatum, Plagiothecium nemorale, Plagiothecium succulentum, Plagiothecium undulatum, Pleurozium schreberi, Pseudoscleropodium purum, Pseudotaxiphyllum elegans, Rhytidiadelphus loreus, Rhytidiadelphus triquetrus, Thuidium tamariscinum, Tetraphis pellucida, Barbilophozia attenuata, Barbilophozia floerkei, Calypogeia fissa, Calypogeia trichomanis, Cephalozia bicuspidata, Gymnocolea inflata, Lepidozia reptans, Lophocolea bidentata, Lophocolea heterophylla, Cladonia coccifera, Cladonia coniocraea, Cladonia fimbriata, Cladonia polydactyla, Cladonia squamosa, Solidago virgaurea, Lonicera periclymenum, Corydalis claviculata, Teucrium scorodonia, Hyacinthoides non-scripta, Chamerion angustifolium, Oxalis acetosella, Digitalis purpurea, Rumex acetosella, Potentilla erecta, Rubus fruticosus agg., Galium saxatile, Agrostis capillaris, Agrostis stolonifera, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Holcus lanatus, Holcus mollis, Molinia caerulea, Blechnum spicant, Pteridium aquilinum, Dryopteris dilatata

W17 — Altantic hazel wood, Atlantic oak wood, Caledonian forest, Upland birch wood, Wood pasture

Quercus petraea-Betula pubescens-Dicranum majus woodland

Hedera helix, Salix caprea, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Betula pubescens, Corylus avellana, Fagus sylvatica, Quercus hybrid, Quercus petraea, Quercus robur, Fraxinus excelsior, Sorbus aucuparia, Calluna vulgaris, Erica cinerea, Erica tetralix, Juniperus communis, Rhododendron ponticum, Vaccinium myrtillus, Crataegus monogyna, Carex pilulifera, Luzula multiflora, Luzula pilosa, Luzula sylvatica, Andreaea rupestris, Mnium hornum, Rhizomnium punctatum, Campylopus flexuosus, Dicranella heteromalla, Dicranodontium denudatum, Dicranum fuscescens, Dicranum majus, Dicranum scoparium, Dicranum scottianum, Leucobryum glaucum, Ptychomitrium polyphyllum, Racomitrium fasciculare, Racomitrium heterostichum, Racomitrium lanuginosum, Eurhynchium striatum, Heterocladium heteropterum, Hylocomiastrum umbratum, Hylocomium armoricum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Hypnum jutlandicum, Isothecium myosuroides, Kindbergia praelonga, Loeskeobryum brevirostre, Plagiothecium denticulatum, Plagiothecium undulatum, Pleurozium schreberi, Pseudoscleropodium purum, Pseudotaxiphyllum elegans, Ptilium crista-castrensis, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sematophyllum demissum, Sematophyllum micans, Thuidium delicatulum, Thuidium tamariscinum, Polytrichum commune, Polytrichum formosum, Sphagnum capillifolium, Sphagnum fimbriatum, Sphagnum palustre, Sphagnum russowii, Sphagnum subnitens, Tetraphis pellucida, Adelanthus decipiens, Anastrepta orcadensis, Barbilophozia attenuata, Barbilophozia floerkei, Bazzania tricrenata, Bazzania trilobata, Blepharostoma trichophyllum, Calypogeia fissa, Calypogeia muelleriana, Cephalozia bicuspidata, Diplophyllum albicans, Frullania tamarisci, Fuscocephaloziopsis lunulifolia, Harpanthus scutatus, Jamesoniella autumnalis, Jungermannia gracillima, Lepidozia pearsonii, Lepidozia reptans, Lophocolea bidentata, Lophocolea heterophylla, Lophozia ventricosa, Marsupella emarginata, Microlejeunea ulicina, Mylia taylorii, Nowellia curvifolia, Plagiochila asplenioides, Plagiochila atlantica, Plagiochila killarniensis, Plagiochila porelloides, Plagiochila punctata, Plagiochila spinulosa, Ptilidium ciliare, Saccogyna viticulosa, Scapania gracilis, Scapania nemorea, Scapania umbrosa, Tritomaria exsectiformis, Tritomaria quinquedentata, Cladonia arbuscula, Cladonia chlorophaea, Cladonia digitata, Cladonia furcata, Cladonia impexa, Cladonia polydactyla, Cladonia squamosa, Cladonia squamules, Cladonia subcervicornis, Parmelia saxatilis, Sphaerophorus fragilis, Sphaerophorus globosus, Solidago virgaurea, Lonicera periclymenum, Succisa pratensis, Cornus suecica, Hypericum pulchrum, Teucrium scorodonia, Hyacinthoides non-scripta, Goodyera repens, Oxalis acetosella, Digitalis purpurea, Rumex acetosa, Lysimachia nemorum, Trientalis europaea, Anemone nemorosa, Potentilla erecta, Rubus fruticosus agg., Rubus idaeus, Galium saxatile, Melanpyrum pratense, Viola riviniana, Agrostis capillaris, Agrostis stolonifera, Agrostis vinealis, Anthoxanthum odoratum, Dactylis glomerata, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Holcus lanatus, Holcus mollis, Molinia caerulea, Poa nemoralis, Poa pratensis, Blechnum spicant, Pteridium aquilinum, Dryopteris aemula, Dryopteris borreri, Dryopteris dilatata, Dryopteris filix-mas, Hymenophyllum tunbrigense, Hymenophyllum wilsonii, Polypodium vulgare, Thelypteris limbosperma, Athyrium filix-femina