Details:

Journal Title:
Harmful Algae
Personal Author:
Wang, Yanfei ; Coyne, Kathryn J.
Wang, Yanfei ; Coyne, Kathryn J. Less -
NOAA Program & Office:
Sea Grant ; OAR (Oceanic and Atmospheric Research) ; NOS (National Ocean Service)
Sea Grant ; OAR (Oceanic and Atmospheric Research) ; NOS (National Ocean Service) Less -
Description:
Shewanella sp. IRI-160 is an algicidal bacterium isolated from Delaware Inland Bays. It secretes water-soluble compounds that inhibit the growth of dinoflagellates. Previous research indicated that this bacterium does not have a negative impact on other algal species. In this research, Shewanella sp. IRI-160 was immobilized to different porous matrices, including agarose, alginate hydrogel, cellulosic sponge, and polyester foam. The retention of Shewanella sp. IRI-160 on or within these matrices was examined at 4 and 25 °C for 12 days. Results indicated that alginate was superior in terms of cell retention, with >99% of Shewanella cells retained in the matrix after 12 days. Shewanella sp. IRI-160 cells were then immobilized within alginate beads to evaluate algicidal effects on harmful dinoflagellates Karlodinium veneficum and Prorocentrum minimum at bacterial concentrations of 106 to 108 cells mL−1. The effects on dinoflagellates were compared to non-harmful cryptophyte Rhodomonas sp., as well as the effects of free-living bacteria on these species. Results indicated that immobilized Shewanella sp. IRI-160 in alginate beads were as effective as the free-living bacteria to control the growth of K. veneficum and P. minimum, while no negative impacts of immobilized Shewanella sp. IRI-160 on the non-harmful control species Rhodomonas sp. were observed. Overall, this study suggests that immobilized Shewanella sp. IRI-160 may be used as an environmentally friendly approach to prevent or mitigate the blooms of harmful dinoflagellates and provides insight and directions for future studies.
Keywords:
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Cyanobacterial Blooms Nutrient Pollution Of Water Rivers Toxic Algae Shewanella sp. IRI-160, Algicidal bacteria, Immobilized bacteria, Dinoflagellates, Algicide, Alginate
Source:
Harmful Algae, 94, 1-11
DOI:
https://doi.org/10.1016/j.hal.2020.101798
Pubmed ID:
32414500
Document Type:
Journal Article
Funding:
Grant no. NA15NOS4780176 ; Grant no. R/HCE-25
Grant no. NA15NOS4780176 ; Grant no. R/HCE-25 Less -
Place as Subject:
Great Lakes Watershed (North America)
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:ebe976099aa530982f6ef795dd8d08d3be55e16e6ab901cdf17e920d23bfcfee
Download URL:
https://repository.library.noaa.gov/view/noaa/28820/noaa_28820_DS1.pdf
File Type:

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