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Titolo:
LEAD ISOTOPIC DISEQUILIBRIA BETWEEN PLANKTON ASSEMBLAGES AND SURFACE WATERS REFLECT LIFE-CYCLE STRATEGIES OF COASTAL POPULATIONS WITHIN A NORTHEAST PACIFIC UPWELLING REGIME
Autore:
FLEGAL AR; GARRISON DL; NIEMEYER S;
Indirizzi:
UNIV CALIF SANTA CRUZ,INST MARINE SCI SANTA CRUZ CA 95064 LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM LIVERMORE CA 94550
Titolo Testata:
Limnology and oceanography
fascicolo: 3, volume: 38, anno: 1993,
pagine: 670 - 678
SICI:
0024-3590(1993)38:3<670:LIDBPA>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
CALIFORNIA CURRENT; PHYTOPLANKTON; INDUSTRIAL; FILAMENTS; TRACERS; EDDIES; FLUXES; JETS;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
A.R. Flegal et al., "LEAD ISOTOPIC DISEQUILIBRIA BETWEEN PLANKTON ASSEMBLAGES AND SURFACE WATERS REFLECT LIFE-CYCLE STRATEGIES OF COASTAL POPULATIONS WITHIN A NORTHEAST PACIFIC UPWELLING REGIME", Limnology and oceanography, 38(3), 1993, pp. 670-678

Abstract

Stable lead isotopic compositions (Pb-204, Pb-206, Pb-207, Pb-208) were determined for net plankton samples from a northeast Pacific upwelling regime, following a study that revealed pronounced isotopic composition differences in seawater within that regime. Lead isotopic ratiosof the plankton were positively correlated with those of the seawater. Both evidenced the predominance of two sources of industrial Pb (North American and Asian aerosols) in northeast Pacific surface waters, which substantiated the postulate that essentially all (> 90%) of the Pb in the northeast Pacific biome derives from anthropogenic emissions. However, the isotopic compositions of plankton and seawater collectedconcurrently from the same locations were often markedly dissimilar. The isotopic disequilibria are attributed to rapid vertical transport of plankton through water masses with different isotopic compositions during upwelling events. That proposed transport is consistent with associated observations of differences in species composition and nutrient concentrations in the upwelling regime. It is also consistent with the hypothesis that some phytoplankton species form rapidly sinking resting spores and senescent cells as a life cycle strategy in temperatecoastal waters where ephemeral upwelling events episodically disrupt stratified conditions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:24:56