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Abstract

Faecal pollution of water by bacteria has a negative effect on water quality and can pose a potential health hazard. Conventional surveillance of microbial water quality relies on the analysis of low-frequency spot samples and is thus likely to miss episodic or periodic pollution. This study aimed to investigate the potential of filter-feeding sponges for time-integrated biomonitoring of microbial water quality. Laboratory trials tested the effects of different ratios of bacterial abundance and the sequence of exposure on bacterial retention by the freshwater sponge (Linnaeus, 1759) to establish its potential to indicate bacterial exposure. Gemmule grown sponges were simultaneously exposed to and but at different ratios (Trial 1) or individually exposed to each bacterial species but in different sequential order (Trial 2). The and retained in each sponge was quantified by culture on selective agars. Data analysis was conducted using the Kruskal–Wallis test and/or the Mann–Whitney U test to compare between the numbers of bacteria retained in each treatment. Additionally, the Wilcoxon matched-paired signed-rank test was used for comparison of the different bacterial abundances retained within each individual sponge. Sponges from all trials retained and in small numbers relative to the exposure (<0.05 % Trial 1 and <0.07 % Trial 2) but exhibited higher retention of . Higher abundance of either bacterial species resulted in significantly lower (<0.005) retention of the same species within sponges (Trial 1). An initial exposure to resulted in significantly higher (=0.040) retention of both bacterial species than when sponges were exposed to first (Trial 2).Bacterial retention by sponges was neither quantitatively representative of bacterial abundance in the ambient water nor the sequence of exposure. This implies either selective filtration or an attempt by sponges to prevent infection. However, freshwater sponges may still be useful in biomonitoring as qualitative time-integrated samplers of faecal indicator bacteria as they detect different bacteria present in the water even if their quantities cannot be estimated.

Funding
This study was supported by the:
  • Department for Employment and Learning, Northern Ireland
    • Principle Award Recipient: AllisonCartwright
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2024-04-19
2024-05-02
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