Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Sediment distribution, hydrolytic enzyme profiles and bacterial activitiesin the guts of Oneirophanta mutabilis, Psychropotes longicauda and Pseudostichopus villosus: what do they tell us about digestive strategies of abyssal holothurians?
Autore:
Roberts, D; Moore, HM; Berges, J; Patching, JW; Carton, MW; Eardly, DF;
Indirizzi:
Queens Univ Belfast, Sch Biol & Biochem, Belfast, Antrim, North Ireland Queens Univ Belfast Belfast Antrim North Ireland , Antrim, North Ireland Natl Univ Ireland Univ Coll Galway, Ryan Inst, Galway, Ireland Natl Univ Ireland Univ Coll Galway Galway Ireland Inst, Galway, Ireland
Titolo Testata:
PROGRESS IN OCEANOGRAPHY
fascicolo: 1-4, volume: 50, anno: 2001,
pagine: 443 - 458
SICI:
0079-6611(2001)50:1-4<443:SDHEPA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEEP-SEA SEDIMENTS; ORGANIC-MATTER; ENVIRONMENTS; BIOMASS; CONSTRAINTS; ATLANTIC; SYSTEM;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Roberts, D Queens Univ Belfast, Sch Biol & Biochem, Belfast, Antrim, NorthIreland Queens Univ Belfast Belfast Antrim North Ireland orth Ireland
Citazione:
D. Roberts et al., "Sediment distribution, hydrolytic enzyme profiles and bacterial activitiesin the guts of Oneirophanta mutabilis, Psychropotes longicauda and Pseudostichopus villosus: what do they tell us about digestive strategies of abyssal holothurians?", PROG OCEAN, 50(1-4), 2001, pp. 443-458

Abstract

This paper describes inter-specific differences in the distribution of sediment in the gut compartments and in the enzyme and bacterial profiles along the gut of abyssal holothurian species - Oneirophanta mutabilis, Psychropotes longicauda and Pseudostichopus villosus sampled from a eutrophic site in the NE Atlantic at different times of the year. Proportions of sediments, relative to total gut contents, in the pharynx, oesophagus, anterior and posterior intestine differed significantly in all the inter-species comparisons, but not between inter-seasonal comparisons. Significant differences were also found between the relative proportions of sediments in both the rectum and cloaca of Psychropotes longicauda and Oneirophanta mutabilis. Nineteen enzymes were identified in either gut-tissue or gut-content samples ofthe holothurians studied. Concentrations of the enzymes in gut tissues andtheir contents were highly correlated. Greater concentrations of the enzymes were found in the gut tissues suggesting that they are the main source of the enzymes. The suites of enzymes recorded were broadly similar in each of the species sampled collected regardless of the time of the year, and they were similar to those described previously for shallow-water holothurians. Significant inter-specific differences in the gut tissue concentrations of some of the glycosidases suggest dietary differences. For example, Psychropotes longicauda and Pseudostichopus villosus contain higher levels of chitobiase than Oneirophanta mutabilis. There were no seasonal changes in bacterial activity profiles along the guts of O. mutabilis and Pseudostichopusvillosus. In both these species bacterial activity and abundance declined between the pharynx/oesophagus and anterior intestine, but then increased along the gut and became greatest in the rectum/cloaca. Although the data sets were more limited for Psychropotes longicauda, bacterial activity increased from the anterior to the posterior intestine but then declined slightlyto the rectum/cloaca. These changes in bacterial activity and densities probably reflect changes in the microbial environment along the guts of abyssal holothurians. Such changes suggest that there is potential for microbialbreakdown of a broader range of substrates than could be otherwise tie achieved by the holothurian itself. However, the present study found no evidence for sedimentary (microbial) Sources or hydrolytic enzymes. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 23:04:50