Vegetation (Floating River Vegetation) - Office of Public Works

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ecological terms this is known as “succession”. 52
6.0 Conclusion and summary •Arterial drainage works, which involve excavation of the riverbed, are likely to cause a significant negative impact on floating river vegetation and their habitats. If hydraulic conditions are suitable floating river vegetation may recolonise the watercourse. •Arterial drainage maintenance carried out in accordance with the Environmental Drainage Maintenance (EDM) Programme causes a minor negative impact or a minor positive impact on habitats supporting floating river vegetation. The mitigation measures proposed will tend to lead to a minor positive impact. In certain cases excessive floating river vegetation growth may occur and additional maintenance may be required in these circumstances. •Floating river vegetation was present on most Office of Public Works main channels. No floating river was evident on the River Maigue. It is uncertain whether floating river vegetation was present on the Owenriff River due to flood waters observed during the survey. •Parameters influencing the diversity of floating river vegetation include shade, water depth and water flow. Other parameters that affect growth are water quality, adjoining land use, riverbed substrate and habitat encroachment by terrestrial plant species. •In general terms deep waters were inhabited by Pondweed species. Fast water flow favoured some water crowfoot species; slow water flow favoured other water crowfoot species, starworts, and some pondweed species. Shallow water supported aquatic moss and sections of watercourses with silt deposits were colonised by water parsnip. •Although no confirmed identification of R.fluitans was recorded during the course of this survey, the true species identification of Ranunculus spp. could not be undertaken due to the absence of flowering structures. 53
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 and 44: Not shown in the above data set is
Page 45 and 46: 4.4 Physical, chemical and biologic
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: River Breagagh Winter 2006 Ranuncli
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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Vegetation (Floating River Vegetation) - Office of Public Works

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