Abstract
Between 1968 and 1994, Tehuelche scallop (Aequipecten tehuelchus) was fished in San Matías Gulf (Argentine Patagonia) using dredges. The catch was not sorted on board; epifaunal invertebrate bycatch and inorganic substrate removed by the dredges were landed together with scallops. Surveys were conducted in 1987 and 1997 on four fishing grounds following the same methodology to estimate the abundance of epifaunal components using catch and swept-area data. Univariate, distributional, and multivariate methods were used to analyze biodiversity and its change between surveys. There was no recorded dredging on two of the fishing grounds in the intervening period between the two surveys. Fishing effort in the order of 5,000 effective fishing hours occurred at each of the other two grounds, during that period. Multivariate analysis indicates that macrofaunal assemblages changed in each ground between 1987 and 1997, according to fishing intensity and time lapsed since last fishing action. Fishing grounds that were not dredged during the 10-year period showed no significant changes in species composition and dominance. The results support the hypothesis that dredging causes high levels of disturbance that affect the whole benthic ecosystem. Community “recovery” seems to be a non-stationary process that may not reverse the system to pre-harvest conditions, but lead instead to a sequence of new states with faunistic changes governed by colonization and slow rebuilding of habitat complexity.
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References
Caddy, J. F., 1975. Spatial model for an exploited shellfish population, and its application to the Georges Bank scallop fishery. Journal Fisheries Research Board Canada 32: 1305–1328.
Ciocco, N. F., M. Lasta, M. Narvarte, C. Bremec, E. Bogazzi, J. Valero & J. M. Orensanz, 2006. Scallops in Argentina. In Shumway, S. & G. J. Parsons (eds) Scallops: Ecology and Aquaculture, 2nd ed., Chapter 26. Elsevier, Amsterdam: 1251–1292.
Clarke, K. R., 1993. Non-parametric multivariate analyses of changes in community structure. Australian Journal of Ecology 18: 117–143.
Clarke, K. R. & R. N. Gorley, 2001. PRIMER v 5. User’s Manual/Tutorial. PRIMER-E, Plamouth: 91.
Collie, J., S. J. Hall, M. Kaiser & I. Poiner, 2000. A quantitative analysis of fishing impacts on shelf-sea benthos. Journal of Animal Ecology 69: 785–798.
Cranfield, H. J., G. Carbines, K. P. Michael, A. Dunn, D. R. Stotter, D. J. Smith, 2001. Promising signs of regeneration of blue cod and oyster habitat changed by dredging in Foveaux Strait, southern New Zealand. New Zealand Journal of Marine and Freshwater Research 35: 897–908.
Currie, D. R. & G. D. Parry, 1996. Effects of scallop dredging on a soft bottom sediment community: a large-scale experimental study. Marine Ecology Progress Series 134: 131–150.
Hall, S. J. & M. J. C. Harding, 1997. Physical disturbance and marine benthic communities: the effect of mechanical harvesting of cockles on non-target benthic infauna. Journal Applied Ecology 34: 497–517.
Hall-Spencer, J. M. & P. J. Moore, 2000. Scallop dredging has profound, long-term impact on mearl habitat. ICES Journal of Marine Science 57: 1407–1415.
Hall-Spencer, J. M., C. Froglia, R. J. Atkinson & P. G. Moore, 1999. The impact of rapido trawling for scallops, Pecten jacobeous (L.) on the benthos of the Gulf of Venice. ICES Journal Marine Science 56: 111–124.
Iribarne, O. O., M. L. Lasta, H.·C. Vacas, A. M. Parma & M. S. Pascual, 1991. Assessment of abundance, gear efficiency and disturbance in a scallop dredge fishery: results of a depletion experiment. In Shumway, S. E. & P. A. Sandifer (eds), An International Compendium of Scallop Biology and Culture. The World Aquaculture Society, New York, USA: 242–248.
Jennings, S., J. K. Pinnegard, N. V. C. Polunin & K. J. Warr, 2001. Impacts of trawling disturbance on the trophic structure of benthic invertebrate communities. Marine Ecology Progress Series 213: 127–142.
Kaiser, M. J. & S. Jennings, 2001. An ecosystem perspective on conserving targeted and non-targeted species. In Reynolds, J. D., G. M. Mace, K. H. Redford & J. G. Robinson (eds), Conservation of Exploited Species. Cambridge University Press, Cambridge, UK: 345–369.
Kaiser, M. J., J. S. Collie, S. J. Hall, S. Jenning & I. R. Poiner, 2002. Modification of marine habitats by trawl activities: prognosis and solutions. Fish and Fisheries 3: 114–136.
Kaiser, M. J., K. R. Clarke, H. Hinz, M. C. V. Austen, P. J. Somerfield & I. Karakassis, 2006. Global analysis of response and recovery of benthic biota to fishing. Marine Ecology Progress Series 311: 1–14.
Kruskal, J. B. & M. Wish, 1978. Multidimensional Scaling. Sage Publications, Beverley Hills, California.
Lanfredi, N.·W. & J. L. Pousa, 1988. Mediciones de corrientes, San Antonio Oeste, Provincia de Río Negro. Technical Report, Instituto de Biología Marina y Pesquera “Alte. Storni”: 1- 13.
Langton, R. W. & W. E. Robinson, 1990. Faunal association on scallop grounds in the western Gulf of Maine. Journal Experimental Biology and Ecology 144: 157–171.
Lindeboom, H. J. & S. J. de Groot, 1998. IMPACTII: The effect of different types of fisheries on the North Sea and Irish Sea benthic ecosystem. NIOZ––Report 1998-1/RIVO-SLO Report C003/98. Den Burg, Texel, Netherlands, Netherlands Institute for Sea Research: 1–404.
Mazio, C. & C. Vara, 1983. Las mareas del Golfo San Matías, Argentina. Technical Report Servicio de Hidrografía Naval. Dto Oceanografía. IT 13.
Naidu, K. S., 1997. Scalping scallop: ecological consideration relative to large scale renoval without replacement of shells from scallops beds. Abstracts 11th International Pectinid Workshop. La Paz (Mexico). April 1997: 53.
Olivier, S. R. & R. Capitoli, 1980. Edad y crecimiento en Chlamys tehuelcha (d’Orbigny) (MOLLUSCA, PELECYPODA, PECTINIDAE) en el Golfo San Matías (Pcia de Rio Negro, Argentina). Anales Centro Ciencias Marina y Limnologia UNAM (Mexico) 7: 19–140.
Orensanz, J. M., 1986. Size, environmental and density: the regulation of a scallop stock and its management implications. Canadian Special Publication Fisheries & Aquatic Science 92: 195–227.
Orensanz, J., M. S. Pascual & M. Fernández, 1991. Fisheries and aquaculture: Argentina. In Shumway, S. (ed.), Scallops: Biology, Ecology and Aquaculture. Elsevier, Amsterdam and New York: 981–999.
Orensanz, J., A. M. Parma, T. Turk & J. Valero, 2006. Dynamics, assessment and management of exploited natural populations. In Shumway, S. & G. J. Parsons (eds), Scallops: Ecology and Aquaculture, 2nd ed., Chapter 14. Elsevier Publication, Amsterdam: 765–868.
Orensanz, J. M., A. M. Parma, N. F. Ciocco & A. Cinti, 2007. Achievement and setbacks in the commercial diving fishery of San Jose Gulf, Argentine Patagonia. In McClanahan, T. R. & J. C. Castilla (eds), Fisheries Management: Progress Towards Sustainability, Chapter 4. Blackwell Publications, New York: 68–87.
Pielou, E. C., 1975. Ecological Diversity. John Wiley & Sons, New York.
Piola, A. R. & L. M. Scasso, 1988. Circulación en el Golfo San Matías. Geoacta 15: 33–51.
Queiros, A. M., J. G. Hiddink, H. Hinz & M. J. Kaiser, 2006. The effects of chronic bottom trawling disturbance on biomass, production and size-spectra on invertebrate infaunal communities from different habitats. Journal of Experimental Marine Biology and Ecology 335: 91–103.
Rivas, A. L. & E. J. Beier, 1990. Temperature and salinity fields in the Northpatagonic Gulfs. Oceanologica Acta 13: 15–20.
Thrush, S., J. Hewitt, G. A. Funnel, V. Cumming & P. K. Dayton, 1995. The impact of habitat disturbance by scallop-dredging on marine communities: what we can predicted from the results of experiments? Marine Ecology Progress Series 129: 141–150.
Thrush, S., J. Hewitt, G. A. Funnel, V. Cumming, J. Ellis, D. Schulz, D. Talley & A. Norkko, 2001. Fishing disturbance and marine biodiversity: the role of habitat structure in simple soft-sediment system. Marine Ecology Progress Series 223: 277–286.
Vacas, H.·C., Pascual, M. S., Iribarne, O. & Lasta, M. L., 1984. Campaña de pesca experimental “Vieira 83”. Unpublished Technical Report Prepared for the Rio Negro Fisheries Administration., 36 pp.
Watling, L., R. H. Findlay, L. M. Mayer & D. F. Schick, 2001. Impact of a scallop drag on the sediment chemistry, microbiota, and faunal assemblages of a shallow subtidal marine benthic community. Journal of Sea Research 46: 309–324.
Acknowledgments
The present study received financial support from Universidad Nacional del Comahue and the fisheries administration of Rio Negro Province (Argentina). I wish to thank Pablo Martin and Marcos Tatian for taxonomic help with several groups, Sandra Fiori and Ma Eva Gongora for assistance with sampling, Hernan Vacas for giving permission to use the part of the data, and Lobo Orensanz, whose critical reading and suggestions helped to improve the manuscript. Many thanks to Peter Pottinger to help me with the English and two anonymous referees for their recommendations.
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Morsan, E.M. Impact on biodiversity of scallop dredging in San Matías Gulf, northern Patagonia (Argentina). Hydrobiologia 619, 167–180 (2009). https://doi.org/10.1007/s10750-008-9610-y
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DOI: https://doi.org/10.1007/s10750-008-9610-y