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Titolo:
Factors involved in the (near) anoxic survival time of Cerastoderma edule:associated bacteria vs. endogenous fuel
Autore:
Babarro, JMF; de Zwaan, A;
Indirizzi:
Netherlands Inst Ecol, CEMO, NL-4400 AC Yerseke, Netherlands Netherlands Inst Ecol Yerseke Netherlands NL-4400 AC erseke, Netherlands
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
fascicolo: 3, volume: 128, anno: 2001,
pagine: 325 - 337
SICI:
1532-0456(200103)128:3<325:FIIT(A>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANAEROBIC METABOLISM; MYTILUS-EDULIS; SULFIDE; TOLERANCE; RESPONSES; BIVALVES; HYPOXIA; POLYCHAETA; MOLLUSKS; TOXICITY;
Keywords:
anoxia; antibiotics; associated bacteria; cockle; D-lactate; glycogen; molybdate; sulfide; mortality;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: de Zwaan, A Netherlands Inst Ecol, CEMO, POB 140, NL-4400 AC Yerseke, Netherlands Netherlands Inst Ecol POB 140 Yerseke Netherlands NL-4400 AC
Citazione:
J.M.F. Babarro e A. de Zwaan, "Factors involved in the (near) anoxic survival time of Cerastoderma edule:associated bacteria vs. endogenous fuel", COMP BIOC C, 128(3), 2001, pp. 325-337

Abstract

The effect of several antibiotics, molybdate and hydrogen sulfide was tested on anoxic tolerance of the cockle Cerastoderma edule, as well as utilisation of glycogen. The aim was to evaluate the role of fuel depletion and growth of bacteria as a cause of mortality. The exponential increase of sulfide and ammonium occurred in anoxic natural seawater incubations and to a lesser extend in artificial, sulfate free, seawater. This could be strongly decreased by antibacterial agents, which led to improved survival time by approximately two-fold. Molybdate suppressed sulfide formation also, but did not affect survival time. Exogenous sulfide showed a negative effect on survival time at pH 6.8 and induced stronger accumulation of free glucose, (D)-lactate and (L)-alanine. This was not the case at pH 8.2. Fifty percent (LT50) of cockles in anoxic seawater died after 3.5 days still with half the initial glycogen concentration present. However, in the presence of chloramphenicol (LT50 7.9 days), the cockles utilised their endogenous fuel almostcompletely. In both incubations there was initially a strong increase of (D)-lactate and (L)-alanine. The (D)-lactate levels subsequently decreased again, probably due to bacterial consumption. This study strongly indicates that in anoxic closed systems, infection by pathogenic bacteria is the first cause of death and not exhaustion of endogenous fuel depots. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 13:04:57