Benthic Communities at Horns Rev Before, During and After Con

More documents

Recommendations

Info

Horns Rev. Benthic communities Page 54 (Figure 3.14). Lengths in the population of Mytilus edulis increased from a maximum of 10 mm in March 2003 to a maximum of 75 mm in September 2005. Differences between spring and autumn surveys and the gradually approximation to steady levels of body size reflects natural breeding and succession in the populations of Jassa marmorata and Caprella linearis. Considerable differences were found in the abundance and biomass between the individual turbine sites of the dominant species, which was evident by the distribution pattern of Mytilus edulis. Populations of Mytilus edulis were basically well established at turbine sites 55, 58 and especially at 95 by the end of the monitoring period. At turbine sites 33, 91 and 92, only very young and newly settled mussels were registered. 300000 250000 200000 150000 100000 50000 0 No/m² Abundance March September 2003 2004 2005 a 100 90 80 70 60 50 40 30 20 10 0 % Abundance b March 03 Sept. 03 March 04 Sept. 04 March 05 Sept. 05 Figure 3.13.Abundance at hard bottom substrate a) Surveys. b) Relative abundance of dominant species. 4000 3000 2000 1000 0 100 90 80 70 60 50 40 30 20 10 0 WW g/m² Biomass March September 2003 2004 2005 % Biomass WW March 03 Sept. 03 March 04 Sept. 04 March 05 Sept. 05 a c 2000 1800 1600 1400 1200 1000 800 600 400 200 0 DW g/m² March September 2003 2004 2005 Jassa marmorata Caprella linearis Mytilus edulis Balanus crenatus Asterias rubens Cancer pagurus Pomatoceros triqueter Jassa marmorata Caprella linearis Mytilus edulis Balanus crenatus Asterias rubens Cancer pagurus Pomatoceros triqueter Biomass Figure 3.14.Biomass at hard bottom substrate a) Surveys wet weight. b) Surveys dry weight. c) Relative biomass of dominant species.* Differences between the wet and dry biomass distribution were mainly caused by the differences in the relative proportion between species with shells (barnacles and mussels) and without shells (amphipods). Doc. No. 2572-03-005 rev. 4 b
Horns Rev. Benthic communities Page 55 Table 3.13. Development of mean individual body weight (ww) of typical hard bottom substrate dominants. Hard bottom substrate dominants Mean individual weight mg (ww) March 2003 September 2003 March 2004 September 2004 March 2005 September 2005 Species Group Mean Mean Mean Mean Mean Mean Jassa marmorata Crustacean 4.9 0.8 2.5 1.2 1.0 1.2 Caprella linearis Crustacean 7.5 1.7 3.9 2.2 2.1 3.3 Mytilus edulis Bivalve 9.4 857.8 1,877.7 514.4 1,937.1 975.2 Balanus crenatus Crustacean 164.2 35.5 14.6 29.1 19.1 29.2 Asterias rubens Echinoderm 1,990.6 1,337.0 796.5 300.5 1,633.6 3,018.3 Cancer pagurus Crustacean 41.5 3.4 138.3 12.1 181.3 366.1 Pomatoceros triqueter Bristle worm 22.0 18.6 37.2 48.0 52.6 56.4 2003 Spring Number Number 2500 2000 1500 1000 500 2500 2000 1500 1000 500 2004 Spring Number Number 1000 750 500 250 0 1000 750 500 250 Mytilus edulis Turbine 55 Turbine 58 Turbine 95 Turbine 91 Turbine 92 0 5 10 15 Length (mm) Mytilus edulis 0 5 10 15 Length (mm) Turbine 55 Turbine 58 Turbine 95 Turbine 33 Turbine 91 Turbine 92 0 0 20 40 60 Length (mm) 2005 Spring Number Number 150 100 50 0 150 100 50 Mytilus edulis 0 20 40 60 Length (mm) 0 20 40 60 Length (mm) TurbineM55 TurbineM58 TurbineM95 TurbineM33 TurbineM91 TurbineM92 0 0 20 40 60 Length (mm) 0 20 40 60 Length (mm) 0 20 40 60 Length (mm) 2003 Autumn Number Number 2500 2000 1500 1000 500 2500 2000 1500 1000 500 Mytilus edulis Turbine 55 Turbine 58 Turbine 95 Turbine 33 Turbine 91 Turbine 92 0 10 20 30 40 Length (mm) 2004 Autumn Number Number 4,000 3,000 2,000 1,000 4,000 3,000 2,000 1,000 Mytilus edulis 0 10 20 30 40 Length (mm) 0 10 20 30 40 Length (mm) Turbine 55 Turbine 58 Turbine 95 Turbine 33 Turbine 91 Turbine 92 0 20 40 60 Length (mm) 2005 Autumn Number 3000 2000 1000 0 Mytilus edulis 0 20 40 60 Length (mm) 0 20 40 60 Length (mm) Turbine 55 Turbine 58 Turbine 95 Turbine 33 Turbine 91 Turbine 92 0 0 25 50 75 Length (mm) Figure 3.15.Length frequency diagram of the common mussel Mytilus edulis. Number 3000 2000 1000 0 25 50 75 Length (mm) 0 25 50 75 Length (mm) Doc. No. 2572-03-005 rev. 4
Page 2 and 3:
Published: Benthic Communities at H
Page 4 and 5: Horns Rev. Benthic communities Page
Page 104 and 105:
Doc. No. 2572-03-005 rev. 4 Appendi
Page 106 and 107:
Doc. No. 2572-03-005 rev. 4 2005 Me
Page 108 and 109:
Doc. No. 2572-03-005 rev. 4 2003-Au
Page 110 and 111:
Doc. No. 2572-03-005 rev. 4 2004-Au
Page 112 and 113:
Doc. No. 2572-03-005 rev. 4 2005-Au
Page 114 and 115:
Doc. No. 2572-03-005 rev. 4 2004 Sp
Page 116 and 117:
Doc. No. 2572-03-005 rev. 4 8.4.4.
Page 118 and 119:
Doc. No. 2572-03-005 rev. 4 2004-Sp
Page 120 and 121:
Doc. No. 2572-03-005 rev. 4 2005-Sp
Page 122 and 123:
Doc. No. 2572-03-005 rev. 4 8.4.5.
Page 124 and 125:
Doc. No. 2572-03-005 rev. 4 2005 Sp
Page 126 and 127:
Doc. No. 2572-03-005 rev. 4 2003-Au
Page 128 and 129:
Doc. No. 2572-03-005 rev. 4 2004-Au
Page 130 and 131:
Doc. No. 2572-03-005 rev. 4 2005-Au
Page 132 and 133:
Doc. No. 2572-03-005 rev. 4 2004 Sp
Page 134:
Doc. No. 2572-03-005 rev. 4 Horns R
show all

Benthic Communities at Horns Rev Before, During and After Con

Create successful ePaper yourself

Delete template?

Save as template?