Continuous Plankton Records: a possible reversal in the downward trend in the abundance of the plankton of the North Sea and the Northeast Atlantic

Colebrook, J. M.; Robinson, Georgina; Hunt, Harold; Roskell, J.; John, A.W.G.; Bottrell, Howard H.; Lindley, J. A.; Collins, N. R.; Halliday, N. C.

doi:10.1093/icesjms/41.3.304

Cited by 35 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We suggest a possible explanation for the downward trend in shark catches at Achill Island was that progressively fewer basking sharks occurred there between 1956 and 75 because fewer copepods occurred near the surface off west Ireland over the same period. A long‐term decline in zooplankton abundance in the north‐east Atlantic between 1950 and 1980 has been documented (Colebrook et al ., 1984). Therefore, the decline in basking sharks observed at Achill Island could be the result of a distributional shift of sharks to more productive areas rather than a population response to over‐exploitation.…”

Section: Discussionmentioning

confidence: 99%

Congruent trends in long‐term zooplankton decline in the north‐east Atlantic and basking shark (Cetorhinus maximus) fishery catches off west Ireland

Sims

Reid

2002

Fisheries Oceanography

View full text Add to dashboard Cite

Trends in basking shark (Cetorhinus maximus) fishery catches off Achill Island, west Ireland between 1949 and 1975 were examined in relation to zooplankton (total copepod) abundance in four adjacent sea areas over a 27‐year period. The numbers of basking sharks caught and copepod abundance showed downward trends and were positively correlated (r‐value range, 0.44–0.74). A possible explanation for the downward trend in shark catches was that progressively fewer basking sharks occurred there between 1956 and 1975 because fewer copepods, their food resource, occurred near the surface off west Ireland over the same period. We suggest that the decline in basking sharks may have been due to a distributional shift of sharks to more productive areas, rather than a highly philopatric, localized stock that was over‐exploited.

show abstract

Section: Discussionmentioning

confidence: 99%

Congruent trends in long‐term zooplankton decline in the north‐east Atlantic and basking shark (Cetorhinus maximus) fishery catches off west Ireland

Sims

Reid

2002

Fisheries Oceanography

View full text Add to dashboard Cite

show abstract

“…Further, Heath & al. (1999) compared model results and observations in the field of the abundance and distribution of C. finm arch icus in the North Sea and concluded that advection of spawning individuals from the Norwegian Sea Deep Water, mainly via the Norwegian Trench, is an important source for replenishing the stock of C. finmarchicus and long-term changes in this current might be one of the important ~ it Sundby -Recruitment of Atlantic cod stocks 289 causes of the similar long-term changes observed in the abundance of C. finmarchicus in the North Sea (Colebrook & al. 1984).…”

Section: The Influence Of Temperature and Advection On Zooplankton Abmentioning

confidence: 99%

Recruitment of Atlantic cod stocks in relation to temperature and advectlon of copepod populations

Sundby

2000

Sarsia

223

154

View full text Add to dashboard Cite

“…Trends have been detected in the prevalence of northerly winds (Dickson et al, 1988a), westerly winds (Aebischer et al, 1990;Corten, 1986;Turrell, 1992), windstress and winter cooling (Svendsen and Magnusson, 1992). The Continuous Plankton Recorder data show medium to long-term changes in the abundance of phytoplankton and zooplankton (Colebrook et al, 1984;Lindley et al, 1995).…”

Section: Possible Causesmentioning

confidence: 99%

Changes in North Sea gadoid stocks

Hislop

1996

ICES Journal of Marine Science

View full text Add to dashboard Cite

Abundance and biomass of the major gadoid species in the North Sea have undergone large changes in the present century. During the gadoid outburst of the 1960s and 1970s, cod, haddock, whiting, and Norway pout produced some of the largest (as well as some of the smallest) year classes on record. Food requirements of the enhanced populations may have been some three to four times as large as current and previous levels. Although growth rates of cod did not change, there is evidence that food for juvenile haddock, and possibly whiting, was in short supply during the periods of maximum population density. The environmental factors that led to this increase in reproductive success have not been identified. Indices of recruitment for the whole North Sea, as provided by VPA, represent the pooled contributions of separate spawning units and may not be the most appropriate data to use when modelling the relationship between stock, recruitment, and environmental variables. Analysis of historical data indicates that recent levels of spawning-stock biomass of cod and haddock are close to their historic minima and fishing mortality rates are at (cod) or near (haddock) an historic maximum. Measures to reduce fishing mortality and improve exploitation patterns should be given the highest priority.1996 British Crown

show abstract

Continuous Plankton Records: a possible reversal in the downward trend in the abundance of the plankton of the North Sea and the Northeast Atlantic

Cited by 35 publications

References 0 publications

Congruent trends in long‐term zooplankton decline in the north‐east Atlantic and basking shark (Cetorhinus maximus) fishery catches off west Ireland

Congruent trends in long‐term zooplankton decline in the north‐east Atlantic and basking shark (Cetorhinus maximus) fishery catches off west Ireland

Recruitment of Atlantic cod stocks in relation to temperature and advectlon of copepod populations

Changes in North Sea gadoid stocks

Contact Info

Product

Resources

About