Consulta: creatorFacets:"Velimirov, B"
Registros recuperados: 3
Data/hora: 09/06/2024 10:51:22

Role of bacteria in the gastral cavity of Anthozoa.
Provedor de dados: 5
Autores: Herndl, G; Velimirov, B.
Bacterial density of the coelenteric fluid (CF) of some anthozoan species was determined in situ and under laboratory conditions. In all species examined bacterial density of the CF was higher in the gastral cavity than in ambient ranging from 10 super(5) up to 5 x 10 super(6) cells. ml super(-1). Incubation experiments with the CF indicate that a bacterial population within the coelenteron is efficiently controlled by the CF, favoring bacterial growth if bacterial densities are low in the CF and showing clearance activity at high bacterial densities. Feeding of pre-starved anthozoans caused a rapid response of coelenteric rod-shaped bacteria. Evidence is presented that coelenteric bacteria are digested periodically although they contribute 1% to the...
Tipo: Text
Palavras-chave: Anthozoa; Coelomic fluids; Bacteria; Microorganisms; Interspecific relationships; Metabolism; Nutrition.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-989.pdf

Succession in a kelp bed ecosystem; clearing of primary substrate by wave-induced kelp sweeping
Provedor de dados: 5
Autores: Velimirov, B.
Observing that wave induced sweeping of the fronds of plants at the edges of kelp patches results in a relatively barren interface between kelp plants and the surrounding animal patches led to the assumption that: a) kelp sweeping could provide protection for macrophytes from grazers; and b) that it could be a mechanism allowing kelp patch expansion. The validity of the hypothesis was supported by quantitative observations on the sweeping capabilities of individual kelp plants and by characteristic species/biomass distributions within the kelp sweeping zone, the kelp patches and the adjacent animal patches. In addition, experimental clearing of the primary substrate within the various areas showed that free space will be completely occupied within 50 days...
Tipo: Text
Ano: 1983
URL: http://archimer.ifremer.fr/doc/00247/35797/34310.pdf

Biomass distribution and physiological capabilities of bacteria in the water column above a sea grass system.
Provedor de dados: 5
Autores: Velimirov, B; Herndl, G; Kavka, G.
The distribution pattern of bacteria in the water column above and within a Posidonia oceanica bed near Ischia (off the Gulf of Naples) was investigated and correlated with DOC and POM data for autumn and winter. Data from samples of 5 stations along a transect from shallow to deep showed rather low bacterial densities (10 super(4).ml super(-1)) for both seasons. The number of attached bacteria was higher in late winter as compared to autumn when the leaves are shed from the stands. Except for occasional peaks DOC ranged between 1.5 and 4.5 mg C/1 while POM concentrations ranged form 4 to 14 mg AFDW.1 super(-1). Hydrolytic capabilities of isolated bacterial colonies showed that more carbohydrate substrates could be fermented in winter as compared to...
Tipo: Text
Palavras-chave: Posidonia oceanica; Microorganisms; Physiology; Seasonal distribution; Algae; Bacteria; Particulate organic matter; Metabolism; Water column; Fermentation; Sea grass.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-954.pdf