Lakes and Watercourses

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TABLE 48. (Contd.) Proportion of salmonids (flow = < 0.2 - 0.7 m/s – Flowing) Class Description 0 – 99 m ab. 100 – 299 m ab. 300 – 700 m ab. > 700 m ab. 1 No or insign. deviat. ≥ 0.76 ≥ 0.62 ≥ 0.90 ≥ 0.99 2 Slight deviation 0.58 – 0.76 0.34 – 0.62 0.68 – 0.90 0.90 – 0.99 3 Significant deviation 0.38 – 0.58 0.15 – 0.34 0.40 – 0.68 0.88 – 0.90 4 Large deviation 0.17 – 0.38 0.05 – 0.15 0.14 – 0.40 0.54 – 0.88 5 Very large deviation < 0.17 < 0.05 < 0.14 < 0.54 Proportion of salmonids (flow = < 0.7 m/s – Fast-flowing) Class Description 0 – 99 m ab. 100 – 299 m ab. 300 – 700 m ab. > 700 m ab. 1 No or insign. deviat. ≥ 0.78 ≥ 0.43 ≥ 0.95 ≥ 0.98 2 Slight deviation 0.60 – 0.78 0.25 – 0.43 0.80 – 0.95 0.90 – 0.98 3 Significant deviation 0.37 – 0.60 0.11 – 0.25 0.45 – 0.80 0.50 – 0.90 4 Large deviation 0.19 – 0.37 0.05 – 0.11 0.16 – 0.45 0.25 – 0.50 5 Very large deviation < 0.19 < 0.05 < 0.16 < 0.25 Salmonid reproduction 3 Class Description 1 No or insignificant deviation 1.00 2 Slight deviation 0.67 – 1.00 3 Significant deviation 0.50 – 0.67 4 Large deviation 0.33 – 0.50 5 Very large deviation < 0.33 Presence of species and stages sensitive to acidification 4 Class Description 1 No or insignificant deviation a) 2 Slight deviation b) 3 Significant deviation c) 4 Large deviation d) 5 Very large deviation e) Contd. ➤ 79
TABLE 48. (Contd.) Proportion of alien species 5 Class Description 1 No or insignificant deviation 0 2 Slight deviation 0 – 0.01 3 Significant deviation 0.01 – 0.02 4 Large deviation 0.02 – 0.05 5 Very large deviation > 0.05 Overall index 6 Class Description 1 No or insignificant deviation < 2.8 2 Slight deviation 2.8 – 3.3 3 Significant deviation 3.3 – 4.5 4 Large deviation 4.5 – 4.9 5 Very large deviation ≥ 4.9 1 Only fish species native to Sweden are included. The reference value (J) is calculated as follows: J = 1.19 + 0.71 · [Log 10 (Width)] + 0.419 · [Catchment] + 0.142 · [Lake percentage] – 0.0019 · [Height above sea level] using the class values below for the catchment areas and percentage of lakes. Width and height are expressed in metres. Class Catchment Percentage of catchment upstream comprising lakes 1 < 10 km 2 10 % The deviation is then calculated as the ratio between the recorded value and the reference value. 2 Biomass and number are expressed per 100 m 2 . 3 At localities where salmonids occur (char, grayling, trout or salmon), a calculation of the number these four species having yearlings (recruitment) is ascertained. The number of breeding species is divided by the number of species of salmonids. 4 Presence of species and stages sensitive to acidification. a) High density of yearling trout and/or presence of yearling salmon, roach or minnow. b) Presence of cyprinids, gudgeon (Cottus gobio), stone loach (Noemacheilus barbatulus), spined loach, Wels (Siluris glanis) or crayfish and/or occurrence of yearling burbot, grayling or char. c) Presence of bullhead, ruffe, burbot, grayling, char, whitefish, vendace, salmon or eel (Anguilla anguilla) and/or presence of yearling trout or perch. d) Only fish present are perch, pike or mature trout (older than yearlings). e) Absence of species. 5 Calculated as percentage by weight of fish species not native to Sweden out of the total catch. 6 The overall assessment of deviation is obtained by calculating the mean class value for all parameters included (maximum 7 parameters). 80
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Environmental Quality Criteria - La
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TO ORDER Swedish Environmental Prot
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Reference Group Mats Bengtsson, Swe
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Summary This report on lakes and wa
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included. In addition to a large nu
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ased estimates are used. Given that
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TABLE 1. SUMMARY of parameters incl
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16 The current conditions scale in
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(in Swedish with English summary).
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conditions for watercourse flora an
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show the availability of nitrogen i
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Mean concentration of total phospho
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TABLE 9. DEVIATION from reference v
Page 29 and 30: Comments Classifications must be ba
Page 31 and 32: winter/spring, i.e. ice-covered per
Page 33 and 34: Light conditions Introduction Light
Page 35 and 36: TABLE 13. CURRENT CONDITIONS: turbi
Page 37 and 38: Acidity / acidification Introductio
Page 39 and 40: industrial pH). The change in acidi
Page 41 and 42: The pre-industrial concentration of
Page 43 and 44: very high degree of reliability and
Page 45 and 46: TABLE 19. CURRENT CONDITIONS: metal
Page 47 and 48: TABLE 22. DEVIATION from reference
Page 49 and 50: TABLE 24. (continued) Cu Zn Cd Pb C
Page 51 and 52: Swedish EPA (1993): Metals and the
Page 53 and 54: Assessment of current conditions TA
Page 55 and 56: TABLE 29. CURRENT CONDITIONS: poten
Page 59 and 60: References Cronberg, G., Lindmark,
Page 61 and 62: (see Appendix 1). If submerged and
Page 63 and 64: References Andersson, B. (1998): Va
Page 65 and 66: The genera in question and their tr
Page 67 and 68: Benthic fauna Introduction Benthic
Page 69 and 70: TABLE 41. CURRENT CONDITIONS: botto
Page 71 and 72: Comments The assessment must be bas
Page 73 and 74: has yielded better results than did
Page 75 and 76: TABLE 45. CURRENT CONDITIONS: fish,
Page 79: TABLE 48. DEVIATION from reference
Page 84 and 85: Presentation of data When using the
Page 86 and 87: APPENDIX 1 Ceratophyllum demersum 1
Page 88 and 89: APPENDIX 2 Calculation of index and
Page 90 and 91: APPENDIX 2 Table 1b. Indicator gene
Page 92 and 93: Genus Indicator value -------------
Page 94 and 95: APPENDIX 2 45 Planorbis sp. 46 Anis
Page 96 and 97: APPENDIX 2 214 Leuctra hippopus 215
Page 98 and 99: APPENDIX 2 384 Tinodes waeneri 385
Page 100 and 101: APPENDIX 2 (6) O/C index (Wiederhol
Page 102 and 103: APPENDIX 3 Dace Stäm Leuciscus leu
Page 106: REPORT 5050 Environmental Quality C
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