Impact of bottom trawling on sediment characteristics—a study along inshore waters off Veraval coast, India
The present communication is a study on the impact of bottom trawling on the sediment characteristics along Veraval coast, which is the largest trawler port of India. Experimental bottom trawling was conducted from MFV Sagarkripa at five transects of water depths 15-20 m, 21-25 m, 26-30 m, 31-35 m a...
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| Veröffentlicht in: | Environmental monitoring and assessment 2010, Vol.160 (1-4), p.355-369 |
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| creator | Bhagirathan, Usha Meenakumari, B Jayalakshmy, K. V Panda, S. K Madhu, V. R Vaghela, D. T |
| description | The present communication is a study on the impact of bottom trawling on the sediment characteristics along Veraval coast, which is the largest trawler port of India. Experimental bottom trawling was conducted from MFV Sagarkripa at five transects of water depths 15-20 m, 21-25 m, 26-30 m, 31-35 m and 36-40 m in commercial trawling grounds. Trawling was conducted for 12 months in a span of 15 months (September 2005-November 2006) excluding the trawl ban period (June to August). The sediment texture was analysed by pipette analysis and organic matter by wet oxidation method. The variations in organic matter and sediment texture were prominent between the stations selected at different depths. The sedimentary organic matter exhibited variations with different water depths and seasons. The organic matter content decreased with depth. Experimental trawling considerably reduced the organic matter content at all depths. Continued and incessant trawling operation can cause even more drastic reductions, where organic matter (OM) content is already very small. The sand proportion showed depth-wise variation; but seasonal and trawling effect was not significant showing highest values at 36-40 m depth. The silt proportion did not exhibit significant depth-wise variation. The seasonal variation of silt was significant whereas trawling effect imparted to silt was not evident. Trawling has no significant effect on clay concentration. But seasonal variation had great influence on the clay distribution and indicated significantly high depth-season interaction. The sediment of the study area was predominant in silt proportion. It was observed that the seasonal/natural variations were more prominent masking the trawling effect on silt. |
| doi_str_mv | 10.1007/s10661-008-0700-0 |
| format | Article |
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The organic matter content decreased with depth. Experimental trawling considerably reduced the organic matter content at all depths. Continued and incessant trawling operation can cause even more drastic reductions, where organic matter (OM) content is already very small. The sand proportion showed depth-wise variation; but seasonal and trawling effect was not significant showing highest values at 36-40 m depth. The silt proportion did not exhibit significant depth-wise variation. The seasonal variation of silt was significant whereas trawling effect imparted to silt was not evident. Trawling has no significant effect on clay concentration. But seasonal variation had great influence on the clay distribution and indicated significantly high depth-season interaction. The sediment of the study area was predominant in silt proportion. 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V</creatorcontrib><creatorcontrib>Panda, S. K</creatorcontrib><creatorcontrib>Madhu, V. R</creatorcontrib><creatorcontrib>Vaghela, D. T</creatorcontrib><title>Impact of bottom trawling on sediment characteristics—a study along inshore waters off Veraval coast, India</title><title>Environmental monitoring and assessment</title><addtitle>Environ Monit Assess</addtitle><addtitle>Environ Monit Assess</addtitle><description>The present communication is a study on the impact of bottom trawling on the sediment characteristics along Veraval coast, which is the largest trawler port of India. Experimental bottom trawling was conducted from MFV Sagarkripa at five transects of water depths 15-20 m, 21-25 m, 26-30 m, 31-35 m and 36-40 m in commercial trawling grounds. Trawling was conducted for 12 months in a span of 15 months (September 2005-November 2006) excluding the trawl ban period (June to August). The sediment texture was analysed by pipette analysis and organic matter by wet oxidation method. The variations in organic matter and sediment texture were prominent between the stations selected at different depths. The sedimentary organic matter exhibited variations with different water depths and seasons. The organic matter content decreased with depth. Experimental trawling considerably reduced the organic matter content at all depths. Continued and incessant trawling operation can cause even more drastic reductions, where organic matter (OM) content is already very small. The sand proportion showed depth-wise variation; but seasonal and trawling effect was not significant showing highest values at 36-40 m depth. The silt proportion did not exhibit significant depth-wise variation. The seasonal variation of silt was significant whereas trawling effect imparted to silt was not evident. Trawling has no significant effect on clay concentration. But seasonal variation had great influence on the clay distribution and indicated significantly high depth-season interaction. The sediment of the study area was predominant in silt proportion. It was observed that the seasonal/natural variations were more prominent masking the trawling effect on silt.</description><subject>Atmospheric Protection/Air Quality Control/Air Pollution</subject><subject>Bottom trawling</subject><subject>Brackish</subject><subject>Carbon</subject><subject>Clay</subject><subject>Coasts</subject><subject>Contaminated sediments</subject><subject>Earth and Environmental Science</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Ecology</subject><subject>Ecotoxicology</subject><subject>Engineering and environment geology. 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Trawling was conducted for 12 months in a span of 15 months (September 2005-November 2006) excluding the trawl ban period (June to August). The sediment texture was analysed by pipette analysis and organic matter by wet oxidation method. The variations in organic matter and sediment texture were prominent between the stations selected at different depths. The sedimentary organic matter exhibited variations with different water depths and seasons. The organic matter content decreased with depth. Experimental trawling considerably reduced the organic matter content at all depths. Continued and incessant trawling operation can cause even more drastic reductions, where organic matter (OM) content is already very small. The sand proportion showed depth-wise variation; but seasonal and trawling effect was not significant showing highest values at 36-40 m depth. The silt proportion did not exhibit significant depth-wise variation. The seasonal variation of silt was significant whereas trawling effect imparted to silt was not evident. Trawling has no significant effect on clay concentration. But seasonal variation had great influence on the clay distribution and indicated significantly high depth-season interaction. The sediment of the study area was predominant in silt proportion. It was observed that the seasonal/natural variations were more prominent masking the trawling effect on silt.</abstract><cop>Dordrecht</cop><pub>Dordrecht : Springer Netherlands</pub><pmid>19093217</pmid><doi>10.1007/s10661-008-0700-0</doi><tpages>15</tpages></addata></record> |
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| subjects | Atmospheric Protection/Air Quality Control/Air Pollution Bottom trawling Brackish Carbon Clay Coasts Contaminated sediments Earth and Environmental Science Earth sciences Earth, ocean, space Ecology Ecotoxicology Engineering and environment geology. Geothermics Environment Environmental Management Environmental monitoring Environmental Monitoring - methods Exact sciences and technology Geologic Sediments - analysis India Marine Marine and continental quaternary Monitoring/Environmental Analysis Ocean bottom Organic matter Oxidation Pollution, environment geology Ports Predation Seasonal variations Sediments Silt Soil testing Statistical analysis Surficial geology texture Trawling Veraval Water depth |
| title | Impact of bottom trawling on sediment characteristics—a study along inshore waters off Veraval coast, India |
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