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Titolo:
Resistance to freshwater exposure in White Sea Littorina spp. I: Anaerobicmetabolism and energetics
Autore:
Sokolova, IM; Bock, C; Portner, HO;
Indirizzi:
Russian Acad Sci, Inst Zool, White Sea Biol Stn, St Petersburg 199034, Russia Russian Acad Sci St Petersburg Russia 199034 t Petersburg 199034, Russia Alfred Wegener Inst Polar & Marine Res, D-27658 Bremerhaven, Germany Alfred Wegener Inst Polar & Marine Res Bremerhaven Germany D-27658 rmany
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTALPHYSIOLOGY
fascicolo: 2, volume: 170, anno: 2000,
pagine: 91 - 103
SICI:
0174-1578(200003)170:2<91:RTFEIW>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
WORM SIPUNCULUS-NUDUS; ENVIRONMENTAL HYPOXIA; OCTOPINE DEHYDROGENASE; LIQUID-CHROMATOGRAPHY; MARINE-INVERTEBRATES; ENERGY-METABOLISM; PH REGULATION; ACID-BASE; MOLLUSKS; ADAPTATION;
Keywords:
salinity stress; resistance adaptations; anaerobic metabolism; ATP turnover; Littorina spp;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Sokolova, IM Russian Acad Sci, Inst Zool, White Sea Biol Stn, Univ Skaya Nab 1, St Petersburg 199034, Russia Russian Acad Sci Univ Skaya Nab 1 St Petersburg Russia 199034
Citazione:
I.M. Sokolova et al., "Resistance to freshwater exposure in White Sea Littorina spp. I: Anaerobicmetabolism and energetics", J COMP PH B, 170(2), 2000, pp. 91-103

Abstract

Anaerobic metabolism and changes in the osmotic concentration of extravisceral fluid were studied in the White Sea periwinkles (Littorina littorea, Littorina saxatilis and Littorina obtusata) during freshwater exposure. Resistance to hypoosmotic stress increased in the order; L. obtusata < L. saxatilis < L. littorea. Our data suggest that osmotic shock is not a primary reason for mortality of the periwinkles under these conditions. During, environmental anaerobiosis, considerable succinate accumulation (up to 10-19 mu mol g(-1) wet weight), and depletion of phosphagen and ATP pools were foundin the studied species. Other metabolic end products (alanopine, strombine, lactate, acetate or propionate) were not detected. Succinate accumulationand net ATP breakdown were the fastest in the least resistant species, L, obtusata. and slowest in the most resistant, L. littorea. Rate of ATP turnover decreased during freshwater exposure in L. littorea and L. saxatilis, but not in L. obtusata. Our data suggest that differential resistance of three studied Littorina spp. to extreme hypoosmotic stress may be related to their different abilities to reduce metabolic rate and ATP turnover during sustained anoxia. Species-specific variations in anaerobic capacity of Littorina spp. are discussed in relation to their vertical distribution, size and ecology.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 16:18:35