Long-term changes in the trophic level of the Celtic Sea fish community and fish market price distribution

被引:208
作者
Pinnegar, JK
Jennings, S
O'Brien, CM
Polunin, NVC
机构
[1] Ctr Environm Fisheries & Aquaculture Sci, Lowestoft Lab, Lowestoft NR33 0HT, Suffolk, England
[2] Newcastle Univ, Dept Marine Sci & Coastal Management, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
关键词
climate; environment; exploitation; fisheries; nitrogen; stable isotope;
D O I
10.1046/j.1365-2664.2002.00723.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
1. The intensive exploitation of fish communities often leads to substantial reductions in the abundance of target species, with ramifications for the structure and stability of the ecosystem as a whole. 2. We explored changes in the mean trophic level of the Celtic Sea (ICES divisions VII f-j) fish community using commercial landings, survey data and estimates of trophic level derived from the analysis of nitrogen stable isotopes. 3. Our analyses showed that there has been a significant decline in the mean trophic level of survey catches from 1982 to 2000 and a decline in the trophic level of landings from 1946 to 1998. 4. The decline in mean trophic level through time resulted from a reduction in the abundance of large piscivorous fishes and an increase in smaller pelagic species which feed at a lower trophic level. 5. Similar patterns of decline in the trophic level of both catches and landings imply that there have been substantial changes in the underlying structure of the Celtic Sea fish community and not simply a change in fishery preferences. 6. We suggest that the reported changes in trophic structure result from reductions in the spawning stock biomass of traditional target species associated with intensive fishing, together with long-term climate variability. 7. The relative distribution of fish market prices has changed significantly over the past 22 years, with high trophic level species experiencing greater price rises than lower trophic level species. 8. Although decreased abundance of high trophic level species will ultimately have negative economic consequences, the reduction in mean trophic level of the fish community as a whole may allow the system to sustain higher fishery yields. 9. Management objectives in this fishery will depend on the relative values that society attaches to economic profit and protein production.
引用
收藏
页码:377 / 390
页数:14
相关论文
共 76 条
[1]  
Abad R, 1990, RAPPORT COMMISSION I, V32, P256
[2]   Product aggregation, market integration, and relationships between prices: An application to world salmon markets [J].
Asche, F ;
Bremnes, H ;
Wessells, CR .
AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, 1999, 81 (03) :568-581
[3]   THE ECOLOGICAL ROLE OF WATER-COLUMN MICROBES IN THE SEA [J].
AZAM, F ;
FENCHEL, T ;
FIELD, JG ;
GRAY, JS ;
MEYERREIL, LA ;
THINGSTAD, F .
MARINE ECOLOGY PROGRESS SERIES, 1983, 10 (03) :257-263
[4]  
Badalamenti F., 2000, P FISH MED FOOD WEBS, P19
[5]   GLOBAL CLIMATE CHANGE AND INTENSIFICATION OF COASTAL OCEAN UPWELLING [J].
BAKUN, A .
SCIENCE, 1990, 247 (4939) :198-201
[6]  
ben Salem M., 1988, Cybium, V12, P247
[7]   EFFECT OF REGURGITATION ON STOMACH CONTENT DATA OF MARINE FISHES [J].
BOWMAN, RE .
ENVIRONMENTAL BIOLOGY OF FISHES, 1986, 16 (1-3) :171-181
[8]   Comparison of aquatic food chains using nitrogen isotopes [J].
Cabana, G ;
Rasmussen, JB .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1996, 93 (20) :10844-10847
[9]   Ecosystems structure before fishing? [J].
Caddy, J .
FISHERIES RESEARCH, 2000, 47 (01) :101-101
[10]   Marine catchment basin effects versus impacts of fisheries on semi-enclosed seas [J].
Caddy, JF .
ICES JOURNAL OF MARINE SCIENCE, 2000, 57 (03) :628-640