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Titolo:
FISHERIES AND OCEANOGRAPHY OFF GALICIA, NW SPAIN - MESOSCALE SPATIAL AND TEMPORAL CHANGES IN PHYSICAL PROCESSES AND RESULTANT PATTERNS OF BIOLOGICAL PRODUCTIVITY
Autore:
TENORE KR; ALONSONOVAL M; ALVAREZOSSORIO M; ATKINSON LP; CABANAS JM; CAL RM; CAMPOS HJ; CASTILLEJO F; CHESNEY EJ; GONZALEZ N; HANSON RB; MCCLAIN CR; MIRANDA A; ROMAN MR; SANCHEZ J; SANTIAGO G; VALDES L; VARELA M; YODER J;
Indirizzi:
UNIV MARYLAND,CTR ENVIRONM & ESTUARINE STUDIES,CHESAPEAKE BIOL LAB,POB 38 SOLOMONS MD 20688 INST ESPANOL OCEANOG LA CORUNA SPAIN OLD DOMINION UNIV,DEPT OCEANOG NORFOLK VA 23529 INST ESPANOL OCEANOG VIGO SPAIN INST ESPANOL OCEANOG FUENGIROLA SPAIN LOUISIANA UNIV MARINE CONSORTIUM CHAUVIN LA 00000 SKIDAWAY INST OCEANOG SAVANNAH GA 00000 NASA,GODDARD SPACE FLIGHT CTR,OCEANS LAB GREENBELT MD 20771 UNIV MARYLAND,CEES,HORN POINT ENVIRONM LAB CAMBRIDGE MD 21613 INST ESPANOL OCEANOG MADRID SPAIN UNIV RHODE ISL,GRAD SCH OCEANOG KINGSTON RI 02882
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C6, volume: 100, anno: 1995,
pagine: 10943 - 10966
SICI:
2169-9275(1995)100:C6<10943:FAOOGN>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
WIND; COAST; RIAS; NORTHWEST; BIOMASS; AFRICA; AROSA; RATES; FISH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
K.R. Tenore et al., "FISHERIES AND OCEANOGRAPHY OFF GALICIA, NW SPAIN - MESOSCALE SPATIAL AND TEMPORAL CHANGES IN PHYSICAL PROCESSES AND RESULTANT PATTERNS OF BIOLOGICAL PRODUCTIVITY", J GEO RES-O, 100(C6), 1995, pp. 10943-10966

Abstract

The Galician shelf off NW Spain (43N degrees 9W degrees) exhibits mesoscale spatial and temporal changes in biological productivity associated with upwelling. Spatial heterogeneity results from local geomorphic and land-sea interactions superimposed on the large scale atmospheric processes that produce upwelling. Wind-induced upwelling events, commonly of short (i.e., week) duration, are more common in the summer than in the winter. A Series of cruises, including some time series sampling, and satellite imagery analysis showed that surface upwelling wasmore common and persistent on the northern coast compared with the western coast off the coastal embayments, the Rias Bajas. Nearshore off the rias, coastal runoff, which is greater in the rainy winter/spring versus the dry summer, affected upwelling. In early summer, upwelling less often reaches the surface because of increased water column stratification associated with lower surface salinities and thus upwelling is not detected by satellite imagery. Conversely, in late summer, upwelling more often reaches the surface because coastal runoff is reducedduring the dry summer months and the water column tends to be less stratified. Plankton biomass and rate processes along the Galician shelfreflected both ambient hydrographic conditions as well as prior history of upwelling or downwelling. Phytoplankton and bacterioplankton were in greatest abundance during upwelling conditions (June through August); in contrast, both zooplankton and fish larvae exhibited highest abundances in March, when there were upwelling conditions prior to our cruise. Spatial differences in the duration and frequency of upwellingevents, in combination with advection of water masses, are critical to the patterns of water column productivity and sardine fisheries production off the Galician coast. More persistent upwelling at this NW corner of the Iberian peninsula Supports large sardine fisheries becausezooplankton and larval fish populations have time to respond to the higher primary production. Farther down the western Galician coast, theepisodic upwelling and resultant intermittent primary production doesnot support a stable food supply needed to support fisheries. Times series sampling revealed mean response times of bacteria, phytoplankton, and zooplankton to be on the order of a day, days, and weeks, respectively. Sardines showed no spawning response in the relatively short time series sampling. The observed distributional patterns of fish eggsand larvae showed some offshore transport of fish larvae that were spawned inshore during upwelling periods and aggregation of larvae in a convergence zone northwest of Cabo Villano.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/11/20 alle ore 20:01:15