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Titolo:
BIOCHEMICAL-COMPOSITION OF AURELIA-AURITA IN RELATION TO AGE AND SEXUAL MATURITY
Autore:
LUCAS CH;
Indirizzi:
UNIV SOUTHAMPTON,DEPT OCEANOG SOUTHAMPTON SO9 5NH HANTS ENGLAND
Titolo Testata:
Journal of experimental marine biology and ecology
fascicolo: 2, volume: 183, anno: 1994,
pagine: 179 - 192
SICI:
0022-0981(1994)183:2<179:BOAIRT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELEMENTAL COMPOSITION; HYDROMEDUSAE; BOLINOPSIS; PACIFIC; CARBON;
Keywords:
AURELIA-AURITA; BIOCHEMISTRY; SEXUAL MATURITY; WATER OF HYDRATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
C.H. Lucas, "BIOCHEMICAL-COMPOSITION OF AURELIA-AURITA IN RELATION TO AGE AND SEXUAL MATURITY", Journal of experimental marine biology and ecology, 183(2), 1994, pp. 179-192

Abstract

Dry weight (DW), ash free dry weight (AFDW), and proximate biochemical composition were examined for a full range of sizes of whole medusaeof the scyphomedusa Aurelia aurita. Dry weight ranged from 3.07 to 3.91% of wet weight (WW), and was fairly uniform throughout the size groups. Ash free dry weight ranged from 25.6 to 46.0% of DW, with values significantly greater in ephyrae and medusae < 20 mm. The sum of carbohydrate, protein and lipid fractions, termed ''total organics'', is often taken to be synonymous with AFDW, but values were consistently lower than AFDW, ranging from 5.56 to 22.76% of DW. Even after AFDW had also been calculated assuming water of hydration to be 11.7%, there were still differences between the two values. Whole Aurelia aurita medusae displayed the typical characteristics of gelatinous predators, withlow carbohydrate (0.10-1.12% of DW), intermediate lipid (3.50-11.50% of DW), and high protein (2.07-28.56% of DW) content. The biochemical composition of isolated umbrellar and gonadal tissues of medusae > 50 mm were examined, and in every size group, ''total organics'' were greater in gonadal than umbrellar tissue. The greater organic content of gonadal tissue was the result of an increase in all three biochemical fractions, with carbohydrates and proteins displaying the greatest differences. Mean values ranged from 0.33 to 0.85% carbohydrate, 2.34-8.31% protein, and 0.87-2.91% lipid in umbrellar tissue, compared with 1.08-2.10%, 4.38-22.98%, and 2.59-6.08%, respectively, in gonadal tissue. The biochemical content of ripe oral arms, i.e. those containing dividing eggs and planula larvae, was similar to that of the maturing gonads. Protein content was greatest in gonads of medusae 60-110 mm, before decreasing significantly with increasing bell diameter. Rapid growth and maturation in the 60-110 mm size group was coincident with the spring peak of mesozooplankton abundance in Southampton Water, while the decline in protein content may be explained by loss in condition of ''spent'' medusae.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:16:40