Senckenbergiana maritima

, 31:107 | Cite as

Long-term changes in the pelagos, benthos and fisheries of the North Sea

  • Philip C. Reid
  • Martin Edwards
Article

Abstract

Pronounced changes have occurred in the fisheries, plankton and benthos of the North Sea over the last five decades. Attribution of the relative contribution of anthropogenic versus natural hydrometeorological modulation to these changes is still unclear. As a background a summary history of our understanding of the state of health of the North Sea is outlined. We then focus on two contrasting periods in the North Sea, one between 1978–82 (cold) and the other post 1987 (warm) when pronounced alterations in many ecosystem characteristics occurred. The scale of the changes in the second of these periods is sufficiently large and wide ranging for it to have been termed a regime shift. A combination of local, regional and far field hydrometeorological forcing, and in particular variability in oceanic inflow, is believed to be responsible for the observed changes. Finally attention is drawn to the poor status of North Sea fish stocks where 7 stocks are documented as being fished outside safe biological limits. This situation is primarily believed to be a consequence of overfishing, but may have been exacerbated by environmental change.

Keywords

North Sea plankton benthos fishery fish stocks long-term change regime shift oceanic inflow NAO global warming 

References

  1. Aebischer, N. J. &Coulson, J. C. &Colebrook, J. M. (1990): Parallel long-term trends across four marine trophic levels and weather. — Nature,347: 753–755.CrossRefGoogle Scholar
  2. Aure, J. (1999): Havets Miljo. — Fisken og Havet,2: 104 pp.Google Scholar
  3. Becker, G. &Pauly, M. (1996): Sea surface temperature changes in the North Sea and their causes. — ICES J. mar. Sci.,53 (6): 887–898.CrossRefGoogle Scholar
  4. Corten, A. (1990): Long-term trends in pelagic fish stocks of the North Sea and adjacent waters and their possible connection to hydrographie changes. — Netherl. J. Sea Res.,25: 227–235.CrossRefGoogle Scholar
  5. Corten, A. (1999): Evidence from plankton for multi-annual variations of Atlantic inflow in the northwestern North Sea. — J. Sea Res.,42: 191–205.CrossRefGoogle Scholar
  6. Corten, A. &Kamp, G. van de (1992): Natural changes in pelagic fish stocks of the North Sea in the 1980s. — ICES Mar. Sci. Symp.,195: 402–417.Google Scholar
  7. Corten, A. &Kamp, G. van de (1996): Variation in the abundance of southern fish species in the southern North Sea in relation to hydrography and wind. — ICES J. mar. Sci.,53: 1113–1119.CrossRefGoogle Scholar
  8. Clark, R. A. &Frid, C. L. J. (2001): Long term changes in the North Sea Ecosystem. — Environmental Rev.,9 (3): 131–187.CrossRefGoogle Scholar
  9. Dahl, E. &Danielssen, D. S. (1992): Long term observations of oxygen in the Skagerrak. — ICES Mar. Sci. Symp.,195: 455–461.Google Scholar
  10. Dann, N. &Richardson, K. (1996): Changes in the North Sea ecosystem and their causes: Arhus 1975 revisited. — ICES J. mar. Sci.,53 (6): 879–1225.CrossRefGoogle Scholar
  11. Dickson, R. R. &Kelly, P. M. &Colebrook, J. M. &Wooster, W. S. &Cushing, D. H. (1988): North winds and production in the eastern North Atlantic. — J. Plankon Res.,10: 151–169.CrossRefGoogle Scholar
  12. Dickson, R. R. &Turrell, W. R. (2000): The NAO: the dominant atmospheric process affecting oceanic variability in home, middle and distant waters of European Salmon. — In:Mills, D. [Ed.]: The Ocean Life of Atlantic Salmon: Environmental and Biological Factors Influencing Survival; Oxford (Fishing News Books).Google Scholar
  13. Dippner, J.W. (1997): Recruitment success of different fish stocks in the North Sea in relation to climate variability. — Dt. Hydrogr. Z.,49: 277–293.CrossRefGoogle Scholar
  14. Dunn, M. R. &reed, P. C. (in prep): Relationships between the environment and the fisheries for red mullet,Mullus surmuletus (Linné 1758), in the North Sea.Google Scholar
  15. Edwards, M. &John, A. W. G. &Hunt, H. G. &Lindley, J. A. (1999): Exceptional influx of oceanic species into the North Sea late 1997. — J. mar. biol. Ass. U. K.,79: 737–739.CrossRefGoogle Scholar
  16. Edwards, M. &John, A. W. G. &Johns, D. G. &Reid, P. C. (2001 a): Case history and persistence of a non-indigenous diatom (Coscinodiscus wailesii) in the North-East Atlantic. — J. mar. biol. Ass. U. K.,81: 207–211.Google Scholar
  17. Edwards, M. &Reid, P. C. &Planque, B. (2001 b): Long-term and regional variability of phytoplankton biomass in the Northeast Atlantic (1960–1995). — ICES J. mar. Sci.,58: 39–49.CrossRefGoogle Scholar
  18. Franzs, H. G. &Colebrook, J. M. &Gamble, J. C. &Krause, M. (1991): The Zooplankton of the North Sea. — Netherl. J. Sea Res.,28: 1–52.CrossRefGoogle Scholar
  19. Greve, W. &Reiners, F. &Nast, J. (1996): Biocoenotic changes of the Zooplankton in the German Bight: the possible effects of eutrophication and climate. — ICES J. mar. Sci.,53: 951–956.CrossRefGoogle Scholar
  20. Hare, S. R. &Minobe, S. &Wooster, W. S. (2000): The nature and impacts of North Pacific climate regime shifts. — Progr. Oceanogr.,47: 99–408.CrossRefGoogle Scholar
  21. Hempel, G. (1978): North Sea fish stocks. Recent changes and their causes. — Rapp. Proc.-verb. Réun. Cons. int. Explor. Mer,172: 1–449.Google Scholar
  22. Hickel, W. &Eickenhoff, M. &Spindler, H. &Berg, J. &Raabe, T. &Muller, R. (1996): Auswertungen von Langzeituntersuchungen von Nährstoffen und Phytoplankton in der Deutschen Bucht. — 213 pp.; Berlin (UBA).Google Scholar
  23. Hislop, J. R. G. (1996): Changes in North sea gadoid stocks. — ICES J. mar. Sci.,53 (6): 1146–1156.CrossRefGoogle Scholar
  24. Holliday, N. P. &reed, P. C. (in press): Is there a connection between high transport of water through the Rockall Trough and ecological changes in the North Sea? — ICES J. mar. Sci.Google Scholar
  25. Josefson, A. B. &Jensen, J. N. &Ærtebjerg, G. (1993): The benthos community structure anomaly in the late 1970s and early 1980s — a result of a major food pulse? — J. exp. mar. Biol. Ecol.,172: 31–46.CrossRefGoogle Scholar
  26. Kröncke, I. (1995): Long-term changes in North Sea benthos. — Senckenbergiana marit.,26 (1/2): 73–80.Google Scholar
  27. Kröncke, I. &Dippner, J. W &Heyen, H. &Zeiss, B. (1998): Long-term changes in macrofaunal communities off Norderney (East Frisia, Germany) in relation to climate variability. — Mar. Ecol. Progr. Ser.,167: 25–36.CrossRefGoogle Scholar
  28. Lamb, H. H. (1988): Weather, Climate and Human Affairs. — 364 pp.; London (Routledge).Google Scholar
  29. Lindeboom, H. &Raaphorst, W. van &Beukema, J. &Cadée, G. &Swennen, C. (1995): (Sudden) Changes in the North Sea and Wadden Sea: Oceanic influences underestimated? — Dt. Hydrogr. Z. Suppl.,2: 87–100.Google Scholar
  30. Lindley, J. A. &Roskell, J. &Warner, A. J. &Halliday, N. C. &Hunt, H. G. &John, A. W. G. &Jonas, T. D. (1990): Doliolids in the German Bight in 1989 — Evidence for exceptional inflow into the North Sea. — J. mar. bio. Ass. U.K.,70: 679–682.CrossRefGoogle Scholar
  31. Meincke, J. &Otto, L. &Lee, A. J. &Dickson, R. R. (1984): Hydrobiological variability in the North Atlantic and adjacent seas. — Rapp. Proc.-verb. Réun. Cons. int. Explor. Mer,185: 296pp.Google Scholar
  32. Mommaerts, J. P. (1985): Observations of phytoplankton blooms in the ICES area. — Ann. Biol.,39: 85–89.Google Scholar
  33. North Sea Task Force NSTF (1993): North Sea Quality Status Report 1993.— 132 pp.; Fredensborg (Olsen & Olsen).Google Scholar
  34. OSPAR Commission (2000a): Quality Status Report 2000, Region II — Greater North Sea. — 136 pp.; London (OSPAR Commission).Google Scholar
  35. OSPAR Commission (2000b): Quality Status Report 2000. — 108 pp.; London (OSPAR Commission).Google Scholar
  36. QSR (1987): Quality Status Report of the North Sea. Scientific and Technical Working Group. — Sec. Internat. Conf. on the Protection of the North Sea; London.Google Scholar
  37. Radach, G. (1998): Quantification of long-term changes in the German Bight using an ecological development index. — ICES. J. mar. Sci.,55 (4): 587–599.CrossRefGoogle Scholar
  38. Reid, P. C. (1984): Year-to-year changes in Zooplankton biomass, fish yield and fish stock in the North Sea. — ICES C. M. 1984/L,39: 7 pp.Google Scholar
  39. Reid, P. C. (1997): Discharges from hydroelectric power schemes as a trigger for marine algal blooms. — Mar. Poll. Bull.,34: 730–733.CrossRefGoogle Scholar
  40. Reid, P. C. (2000). Plankton, fisheries and climate change: insights into ocean ecosystems. — In:Earll, R. C. [Ed.]: Proceedings of Coastal Management for Sustainability. Review and Future Trends: 63–68; Kempley (Candle Cottage).Google Scholar
  41. Reid, P. C. &Hunt, H. G. (1998): Are observed changes in the plankton of the North Atlantic and North Sea linked to climate change? — In:Mills, D. [Ed.]: The Ocean Life of Atlantic Salmon: Environmental and Biological Factors Influencing Survival: 153–169; Oxford (Fishing News Books).Google Scholar
  42. Reid, P. C. &Planque, B. (1999): Long-term planktonic variations and the climate of the North Atlantic. — In:Pierrot-Bults, A. C. &Spoel, S.Van der [Eds.]: Pelagic Biogeography IcoPB II. — IOC Workshop Rep.,142: 310–315.Google Scholar
  43. Reid, P. C. &Lancelot, C. &Gieskes, W. W C. &Hagmeier, E. &Weichart, G. (1990): Phytoplankton of the North Sea and its dynamics: A review. — Netherl. J. Sea Res.,26 (2/4): 295–331.CrossRefGoogle Scholar
  44. Reid, P. C. &Surey-Gent, S. C. &Hunt, H. G. &Durrant, A. E. (1992):Thalassiothrix longissima, a possible oceanic indicator species in the North Sea. — ICES Mar. Sci. Symp.,195: 268–277.Google Scholar
  45. Reid, P. C. &Edwards, M. &Hunt, H. G. &Warner, A. J. (1998): Phytoplankton change in the North Atlantic. — Nature,391: 546.CrossRefGoogle Scholar
  46. Reid, P. C. &Battle, E. J. V. &Batten, S. D. &Brander, K. M. (2000): Impacts of fisheries on plankton community structure. — ICES J. mar. Sci.,57 (3): 495–502.CrossRefGoogle Scholar
  47. Reid, P. C. &Borges, M. F. &Svendsen, E. (2001 a): A regime shift in the North Sea circa 1990. — Fish. Res.,50: 163–171.CrossRefGoogle Scholar
  48. Reid, P. C. &Holliday, N. P. &Smyth, T. J. (2001 b): Pulses in eastern margin current with higher temperatures and North Sea ecosystem changes. — Mar. Ecol. Progr. Ser.,215: 283–287.CrossRefGoogle Scholar
  49. Serchuk, F. M. &Kirkegaard, E. &Daan, N. (1996): Status and trends of the major roundfish, flatfish and pelagic fish stocks in the North Sea: thirty-year overview. — ICES. J. mar. Sci.,53 (6): 1130–1145.CrossRefGoogle Scholar
  50. Skreslet, S. (1986): The Role of Freshwater Outflow in Coastal Marine Ecosystems. — NATO ASI Series: 453 pp.; London (Springer).Google Scholar
  51. Stephens, J. A. &Jordan, M. B. &Taylor, A. H. &Proctor, R. (1998): The effects of fluctuations in North Sea flows on Zooplankton abundance. — J. Plankton Res.,20: 943–956.CrossRefGoogle Scholar
  52. Svendsen, E. &Magnusson, A. K. (1992): Climatic variability in the North Sea. — ICES Mar. Sci. Symp.,195: 144–158.Google Scholar
  53. Svendsen, E. &Aglen, A. &Iverson, S. A. &Skagen, D. W. &Smestad, O. (1995): Influence of climate on recruitment and migration of fish stocks in the North Sea. — Can. J. Fish, aquat. Sci. Spec. Publ.,121: 641–653.Google Scholar
  54. Taylor, A. H. &Stephens, J. A. (1983): Seasonal and year-to-year changes in the temperatures of the English Channel and the Southern North Sea, 1961–1976: a budget. — Oceanol. Acta,6: 63–72.Google Scholar
  55. Thatje, S. &Gerdes, D. (1997): The benthic macrofauna of the inner German Bight: present and past. — Arch. Fish, mar. Res.,45 (2): 93–112.Google Scholar
  56. Vooys, C. G. N. de &Meer, J. van der (1998): Changes between 1931 and 1990 in by-catches of 27 animal species from the southern North Sea. — J. Sea. Res.,39: 291–298.CrossRefGoogle Scholar
  57. Vuorinen, I. &Hanninen, J. &Viitasalo, M. &Helminen, U. &Kuosa, H. (1998): Proportion of copepod biomass declines with decreasing salinity in the Baltic Sea. — ICES J. mar. Sci.,55 (4): 767–774.CrossRefGoogle Scholar
  58. Wieking, G. &Kröncke, I. (2001): Decadal changes in macrofauna communities on the Dogger Bank caused by large-scale climate variability. — In:Kröncke, I. &Türkay, M. &Sündermann, J. [Eds.]: Burning Issues of North Sea Ecology. Proc. 14th internat. Senckenberg Conference North Sea 2000. — Senckenbergiana marit.,31 (2): 125–141.CrossRefGoogle Scholar

Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2001

Authors and Affiliations

  • Philip C. Reid
    • 1
  • Martin Edwards
    • 1
  1. 1.Sir Alister Hardy Foundation for Ocean ScienceThe Hoe, PlymouthU.K.

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