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• W2004676834 abstract "Sedimentary bacteria are consumed and digested by deposit-feeding macroinvertebrates. Lysis of diverse strains of bacteria by deposit feeders may occur at different rates, thus altering the composition of bacteria in feces and surrounding sediments. The goals of this study were to determine whether various sedimentary bacterial isolates were equally susceptible to digestion by the digestive fluids of a model deposit feeder and to identify potential mechanisms of differential digestion. Specifically, cell wall type and exopolymeric capsule production were examined. We used a turbidimetric assay to compare the lytic susceptibilities of bacteria when exposed to digestive fluids collected from the deposit-feeding polychaete, Arenicola marina L.. Forty-three environmental isolates were tested under identical conditions. Significantly different bacteriolytic rates were observed (P<0.0001, ANOVA); 74% of the strains were completely resistant to lysis, while the remaining strains exhibited varied rates of digestion. All gram-positive bacteria were resistant to lysis, while 31% of the gram-negative bacteria were susceptible. Using the G-test of independence (with William's correction) we rejected the null hypothesis that cell wall type and susceptibility were independent (P<0.01). Approximately 88% of the strains tested produced capsules under our culture conditions. Twenty-four percent of the encapsulated bacteria were resistant to digestion, as compared to 20% of the non-encapsulated bacteria. The influence of encapsulation on resistance was not significant (0.75<P; G-test of independence). Although it cannot be concluded that encapsulation provides no protection against digestion for any bacterial strains, it was demonstrated that capsules do not necessarily confer resistance; this likely reflects the diversity of capsule chemistry and structure in various bacterial species. On the contrary, the strong relationship between cell wall type and lytic susceptibility may provide the ability to predict the fate of introduced bacteria to marine sediments. The demonstrated inefficiencies in digestion of bacteria by deposit feeders appear to be due to inherent differences in susceptibilities among bacterial strains, as opposed to physiological differences among individuals of all taxa." @default.
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• W2004676834 date "1998-10-01" @default.
• W2004676834 modified "2023-09-26" @default.
• W2004676834 title "Differential lysis of sedimentary bacteria by Arenicola marina L.: examination of cell wall structure and exopolymeric capsules as correlates" @default.
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• W2004676834 doi "https://doi.org/10.1016/s0022-0981(98)00039-2" @default.
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