Lakes and Watercourses

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TABLE 47. CALCULATION OF REFERENCE VALUES for lakes. Parameter Height (m) Reference value Number of fish species 1 0 – 100 J = 2.44 · Lake area 0.233 101 – 300 J = 2.07 · Lake area 0.218 > 300 J = 1.68 · Lake area 0.171 Species diversity 2 all J = –0.0414 + 0.331 · ln (No. of fish species) Weight per effort 3 0 – 100 J = 3981 · Maximum depth –0.383 101 – 300 J = 2511 · Maximum depth –0.383 > 300 J = 1995 · Maximum depth –0.383 Number per effort 3 0 – 100 J = 77.0 – 35.6 · log 10 (maximum depth) 101 – 300 J = 36.0 – 13.1 · log 10 (maximum depth) > 300 J = 19.8 – 6.1 · log 10 (maximum depth) Proportion of piscivorous percids 4 all J = 0.481 – 0.0000615 · (total weight/effort) Proportion of piscivorous cyprinids 5 all J = 0.283 + 0.0000694 · (total weight/effort) 1 Only fish species native to Sweden are included (see list of species). Lake area is expressed in hectares. 2 Species diversity is calculated as Shannon-Wiener’s H’ = [W tot log 10 (W tot ) – ΣW i log 10 (W i )] / W tot where W tot is the total weight per effort and W i is the weight per effort for each species. 3 Biomass and number are expressed as grams and number per effort, respectively. An effort constitutes one night’s fishing with a net using a standard method. Depth is expressed in metres. 4 Piscivorous percids includes zander (Sander lucioperca) and perch (Perca fluviatilis) more than 150 mm in length. The parameter is only calculated for lakes where perch and/or zander are caught. 5 The following species are classified as cyprinids: asp (Aspius aspius), bleak (Alburnus alburnus), silver bream (Abramis bjoerkna, alt. Blicca bjoerkna), bream (Abramis brama), minnow (Phoxinus phoxinus), Zope (Abramis ballerus), ide (Leuciscus idus), roach (Rutilus rutilus), crucian carp (Carassius carassius), rudd (Rutilus erythrophthalmus, alt. Scardinius erythrophthalmus), dace (Leuciscus leuciscus), tench (Tinca tinca) and Baltic vimba (Abramis vimba alt Vimba vimba). The parameter is only calculated for lakes where cyprinids are caught. 77
TABLE 48. DEVIATION from reference value, watercourses, used only for watercourses that can be assumed to contain, or have contained, fish. Number of species 1 Class Description Recorded value/reference value 1 No or insignificant deviation ≥ 0.85 2 Slight deviation 0.70 – 0.85 3 Significant deviation 0.50 – 0.70 4 Large deviation 0.50 – 0.35 5 Very large deviation < 0.35 Weight 2 /100 m 2 Class Description 0 – 99 m ab. 100 – 299 m ab. 300 – 700 m ab. > 700 m ab. 1 No or insign. deviat. ≥ 525 ≥ 250 ≥ 105 ≥ 65 2 Slight deviation 350 – 525 175 – 250 75 – 105 45 – 65 3 Significant deviation 225 – 350 100 – 175 45 – 75 25 – 45 4 Large deviation 80 – 225 35 – 100 15 – 45 10 – 25 5 Very large deviation < 80 < 35 < 15 < 10 Number 2 /100m 2 Class Description 0 – 99 m ab. 100 – 299 m ab. 300 – 700 m ab. > 700 m ab. 1 No or insign. deviat. ≥ 1.70 ≥ 1.34 ≥ 0.98 ≥ 0.84 2 Slight deviation 1.50 – 1.70 1.05 – 1.34 0.80 – 0.98 0.60 – 0.84 3 Significant deviation 1.24 – 1.50 0.85 – 1.05 0.53 – 0.80 0.40 – 0.60 4 Large deviation 0.67 – 1.24 0.34 – 0.85 0.30 – 0.53 0.30 – 0.40 5 Very large deviation < 0.67 < 0.34 < 0.30 < 0.30 Proportion of salmonids (flow = < 0.2 m/s – Calm) Class Description 0 – 99 m ab. 100 – 299 m ab. 300 – 700 m ab. > 700 m ab. 1 No or insign. deviat. ≥ 0.77 ≥ 0.31 ≥ 0.86 ≥ 0.95 2 Slight deviation 0.53 – 0.77 0.15 – 0.31 0.54 – 0.86 0.80 – 0.95 3 Significant deviation 0.23 – 0.53 0.10 – 0.15 0.16 – 0.54 0.61 – 0.80 4 Large deviation 0.05 – 0.23 0.05 – 0.10 0.05 – 0.16 0.40 – 0.61 5 Very large deviation < 0.05 < 0.05 < 0.05 < 0.40 Contd. ➤ 78
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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
Page 27 and 28: 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 57 and 58: TABLE 32. DEVIATION from reference
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 77: TABLE 46. DEVIATION from reference
Page 81 and 82: TABLE 48. (Contd.) Proportion of al
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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