Climatic influence on a marine fish assemblage

Understanding the fluctuations in marine fish stocks is important for the management of fisheries, and attempts have been made to demonstrate links with oceanographic and climatic variability, including the North Atlantic Oscillation (NAO). The NAO has been correlated with a range of long-term ecological measures, including certain fish stocks. Such environmental influences are most likely to affect susceptible juveniles during estuarine residency, as estuaries are critical juvenile nursery or over-wintering habitats. Here we show that, during a 16-year period, climatic forcing (by means of the NAO) is consistently the most important parameter explaining variation in assemblage composition, abundance and growth of juvenile marine fish during estuarine residency. A possible mechanism for the effect of the NAO is a temperature differential between estuarine and marine waters that allows fish to facultatively exploit optimal thermal habitats. The connection has potentially important implications for the size and numbers of individuals recruited to the fishery, for understanding and predicting the composition of juvenile fish stocks using estuaries, and for the appropriate conservation of estuarine systems in relation to fish stocks.

[1]  I. Potter,et al.  Age composition, growth, movements, meristics and parasites of the whiting, Merlangius merlangus, in the Severn Estuary and Bristol Channel , 1988, Journal of the Marine Biological Association of the United Kingdom.

[2]  Eberhard Hagen,et al.  Long‐term climate forcing of European herring and sardine populations , 1997 .

[3]  A. Wheeler,et al.  The fishes of the British Isles and North-West Europe , 1969 .

[4]  J. Blaxter,et al.  The Biology of the Clupeoid Fishes , 1982 .

[5]  B. Planque,et al.  Is observed variability in the long-term results of the Continuous Plankton Recorder survey a response to climate change? , 1998 .

[6]  A. Corten,et al.  Variation in the abundance of southern fish species in the southern North Sea in relation to hydrography and wind , 1996 .

[7]  M. Power,et al.  Temporal abundance patterns and growth of juvenile herring and sprat from the Thames estuary 1977–1992 , 2000 .

[8]  A. Longhurst Large marine ecosystems: Patterns, processes and yields edited by K. Sherman, L.M. Alexander and B.D. Gold American Association for the Advancement of Science, Washington, DC, 242 pp , 1991 .

[9]  M. Rodwell,et al.  Oceanic forcing of the wintertime North Atlantic Oscillation and European climate , 1999, Nature.

[10]  Keith Brander,et al.  The effect of temperature on growth of Atlantic cod (Gadus morhua L.) , 1995 .

[11]  J. Dippner Recruitment success of different fish stocks in the North Sea in relation to climate variability , 1997 .

[12]  I. Kröncke,et al.  Long-term changes in macrofaunal communities off Norderney (East Frisia, Germany) in relation to climate variability , 1998 .

[13]  J. Rogers The Association between the North Atlantic Oscillation and the Southern Oscillation in the Northern Hemisphere , 1984 .

[14]  N. Bettoso,et al.  First record of the oilfish Ruvettus pretiosus (Pisces: Gempylidae) in the northern Adriatic Sea , 1999, Journal of the Marine Biological Association of the United Kingdom.

[15]  C. Walters,et al.  Quantitative Fisheries Stock Assessment , 1992, Springer US.

[16]  C. O’Brien,et al.  Fisheries: Climate variability and North Sea cod , 2000, Nature.

[17]  M. Thomas Temporal changes in the movements and abundance of Thames estuary fish populations , 1998 .

[18]  M. Power,et al.  Effects on invertebrate populations of drought-induced changes in estuarine water quality , 2000 .

[19]  S. Blaber,et al.  Factors affecting the distribution of juvenile estuarine and inshore fish , 1980 .

[20]  Malcolm Haddon,et al.  Modelling and quantitative methods in fisheries , 2001 .

[21]  K. Drinkwater,et al.  Testing predictions of marine fish and shellfish landings from environmental variables , 1987 .

[22]  Robert J. Wootton,et al.  Ecology of Teleost Fishes , 1989, Springer Netherlands.

[23]  M. Power,et al.  Environmental factors and interactions affecting the temporal abundance of juvenile flatfish in the Thames Estuary , 2000 .

[24]  J. Hutchings Collapse and recovery of marine fishes , 2000, Nature.

[25]  J. Hurrell Decadal Trends in the North Atlantic Oscillation: Regional Temperatures and Precipitation , 1995, Science.