Vegetation (Floating River Vegetation) - Office of Public Works

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The water quality of main channels varied from unpolluted to moderately polluted. Unpolluted rivers included the Owenriff River (2002), the River Corrib (2000) and the Mulkear River (2002). Both the River Nore (2004) and the Bandon River (2003) consisted of unpolluted and slightly polluted sections of waterway, while the River Clare (2003), River Suir (2005), River Maigue (2002) and the River Feale (2005) had stretches of moderately polluted water. Ideally details of the water quality status of 2005/ 2006 would be better for correlating water quality and floating river vegetation recorded at each site. Table 18 lists the water quality status of a selection of tributary rivers associated with a number of the main channels listed above. Although each river supported floating river vegetation, those highlighted in yellow recorded one or more species of Water Crowfoot (Ranunculus). River Name Location Pollution Rating Year Cregg River Bridge South of Addergoole Unpolluted 2000 (Headford and Corrib) Lingaun River (Suir survey square) Breagagh River (Nore survey square) Brownstown Stream (Nore survey square) Groody River (Mulkear survey square) Killeengarriff River Bridge near Drumgriffin Lingaun Bridge Bridge near Annasborough House The three rivers bridge Brewery bridge Bridge North West Aughtanny Bridge South of Brownstown First bridge upstream of Nore River Bridge 2km North Caherconlish Lullonan Bridge Bridge downstream Annagh Bridge (Mulkear survey square) 100m upstream Annagh Bridge Dirty River Bridge upstream Bandon Unpolluted Slightly polluted Unpolluted Unpolluted Moderately polluted Slightly polluted Slightly polluted Slightly polluted Moderately polluted Moderately polluted Unpolluted Unpolluted Slightly polluted Bridge South West of Woodbrook Unpolluted Table 18 Water quality status of tributary rivers associated with main channels. Water crowfoot (Ranunculus) was present on watercourses with unpolluted or slightly 2000 2005 2005 2005 2005 2005 2005 2005 2002 2002 2005 2005 2003 2003 polluted status. In the case of the River Breagagh, Water crowfoot (Ranunculus) was evident on a stretch of river between the two sampling points. The moderately polluted status would not be applicable, only the slightly polluted status which would be in keeping with the other rivers supporting Water crowfoot (Ranunculus). It must be understood that correlating water quality data and floating river vegetation growth in the absence of 2005/ 2006 data must be undertaken with care as the status of some of the moderately and slightly polluted rivers may have improved since the data presented was collected. 38
4.4 Physical, chemical and biological features of watercourses with floating river vegetation. A review of Irish and international reports was undertaken to obtain an overview of the physical, chemical and biological characteristics associated with watercourses supporting floating river vegetation. Measures to create a greater awareness of the causes and threats to habitat destruction along with conservation, management and rehabilitation regimes are documented. Studies in the United Kingdom based on watercourse characteristics and the floating river vegetation found has been classified into six potential aquatic vegetation groupings (Hatton-Ellis & Grieve, 2003). Although the survey included protected and non-protected aquatic vegetation, non- protected species have been abstracted and a summary of the classes and protected floating river species are listed in Table 19. Group River Characteristics Floating river vegetation 1 Large lowland rivers, slow flowing, river bed of silt or clay 2 Small lowland rivers, bedrock is chalk and oolitic limestone, river bed consists of sand, gravel and stones 3 Large river more than 20m wide of variable flow, bedrock of sandstone or hard limestone, alkaline, fair to nutrient rich 4 River or streams usually tributaries of large rivers, variable of geological bedrock, alkaline waters, variable flow and shading 5 Upland rivers, riverbed substrate consists of gravel, stones and large stones or boulders, prone to spate flow, acidic, fairly nutrient rich 6 Rivers of a low gradient, acidic, often associated with raised bog habitats Upland fast flowing rivers, bedrock consisting of hard rock, stable riverbed, acidic R.penicillatus ssp. Pseudofluitans, R.fluitans, P.pectinatus, P.crispus, P.lucens, P.natans, P.perfoliatus, C.platycarpa, C.stagnalis, M.spicatum, Z.palustris, F.antipyretica R.penicillatus ssp. Pseudofluitans, P.crispus, P.natans, C.platycarpa, C.stagnalis, C.obtusangula, Z. Palustris F.antipyretica Ranunculus penicillatus ssp. pseudofluitans, Ranunculus fluitans, P.pectinatus, P.perfoliatus, P.crispus, Z.palustris, F.antipyretica R.penicillatus ssp. Pseudofluitans P.crispus, P.natans, C.humalata, C.platycarpa, C.stagnalis, M.alterniflorum, F.antipyretica R.penicillatus ssp. Pseudofluitans P.crispus, C.humalata, C.stagnalis, M.alterniflorum, F.antipyretica P.polygonifolius, P.natans, C.hamulata, C.stagnalis, M.alterniflorum, F.antipyretica P.polygonifolius, C.hamulata, C.stagnalis, M.alterniflorum, F.antipyretica Table 19 Categories of watercourses in the United Kingdom supporting floating river vegetation (data abstracted and interpreted from Hatton-Ellis & Grieve, 2003). Of interest in the above groupings is the presence of only two species of Water crowfoot 39
Page 1 and 2: ISSN 1649 - 9840 SERIES OF ECOLOGIC
Page 3 and 4: Foreword This Ecological Impact Ass
Page 5 and 6: Executive Summary Table of Contents
Page 7 and 8: 1.0 Introduction This study was com
Page 9 and 10: and fauna. The OPW has a multi-annu
Page 11 and 12: Currently twenty-one Special Areas
Page 13 and 14: 2.1.4 Lower River Shannon Special A
Page 15 and 16: 2.2.4 Site elevations within the Lo
Page 17 and 18: 2.3.4 Site integrity of the Lower R
Page 19 and 20: 3.0 Ecological Assessment of Water
Page 21 and 22: 3.2 Distribution and extent of floa
Page 23 and 24: 3.2.1 Floating river vegetation of
Page 25 and 26: aquatic moss. 3.2.3 Floating river
Page 27 and 28: 3.2.5 Floating river vegetation wit
Page 29 and 30: Starwort, Callitriche species •Ro
Page 31 and 32: Each form of reproduction requires
Page 33 and 34: prevented aquatic growth. Water lev
Page 35 and 36: G.densa was the dominant floating r
Page 37 and 38: 4.0 Description of maintenance oper
Page 39 and 40: consultation with the Foreman / Tec
Page 41 and 42: 4.3 River corridor water dynamics A
Page 43: Not shown in the above data set is
Page 47 and 48: •Survey watercourses to determine
Page 49 and 50: The primary riverbed substrate of w
Page 51 and 52: gravel require loosening assess the
Page 53 and 54: • Livestock should be restricted
Page 55 and 56: River Breagagh Winter 2006 River Br
Page 57 and 58: River Breagagh Winter 2006 Ranuncli
Page 59 and 60: 6.0 Conclusion and summary •Arter
Page 61 and 62: References •Blamey, M., Fritter,
Page 63 and 64: Appendix A - Special Areas of Conse
Page 65 and 66: Lower River Shannon Special Areas o
Page 67 and 68: Channel name Location coordinates E
Page 69 and 70: Appendix C - Habitat classification
Page 71 and 72: Lower River Shannon Special Area of
Page 73 and 74: Lough Corrib Special Area of Conser
Page 75 and 76: 7 Lower River Suir Special Area of
Page 77 and 78: C1 Lower River Shannon Special Area
Page 79 and 80: 6 C1/12/2 C1/18/1/1 /14/7/3 C/20/1
Page 81 and 82: Appendix E - Physical parameters re
Page 83 and 84: River Barrow and River Nore Special
Page 85 and 86: Latin Name English Name Appendix F
Page 87 and 88: Latin Name English Name Potamogeton

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