Bacterial diversity on wild shrimp post larvae in a mangrove biodiversity hotspot

Abstract

Aims: This study aims to assess the impact of anthropogenic activities on shrimp microbiome in a biodiverse mangrove forest ecosystem, along the Merbok River, Kedah, Malaysia. Methodology and results: To assess the impacts, a microbiome study of wild post larvae shrimps along the river was conducted as a health indicator of the shrimp hosts which in turn would reflect the river conditions. A 16S rRNA gene amplicon sequencing of the wild post larvae shrimp microbiomes sampled across areas of varying human activities was conducted. Samples were obtained from four sites ranging from upstream river habitat to downstream brackish water towards the marine coast. Individuals detected from the sequence were then counted and their relative abundance of bacterial diversity were compared. All abundances are up to 100% and the diversity indices were calculated using proportions of each species. The Operational Taxonomy Unit (OTUs) were obtained by using USEARCH and UPARSE software. Twenty-eight bacterium phyla were detected, dominated by phyla Proteobacteria, Actinobacteria, Firmicutes and Bacteroidetes at each site. Eighteen families were dominant at each site with Streptomycetaceae being the major abundant. At the genus level, the most abundant genera were Streptomyces sp., Mesorhizobium sp., Rhizobium sp., Bacillus sp. and Pseudomonas sp. Conclusion, significance and impact of study: In general, the diversity of opportunistic and coliform bacteria was low. Thus, despite being exposed to various levels of human activities, the Merbok River and its mangrove surroundings still serve as a good spawning and nursery sites of shrimps and presumably other inhabitants.

Growth and characterization of bimetallic (Ni,Co) sulfide thin films deposited by spray pyrolysis

“…Figure 4 shows the infrared transmission spectra of bimetallic (Ni,Co) sulfide. The peak at 559,36 cm -1 is attributed to Ni-S stretching vibration [18][19][20][21]. The bands near at 655,80 and 790,81 cm -1 are attributed to C-S bonding vibrations [19,20,22] and the band at 983,70 cm -1 is due to C=O stretching vibration of adsorbed CO 2 from ambient atmosphere [23].…”

“…The peak at 559,36 cm -1 is attributed to Ni-S stretching vibration [18][19][20][21]. The bands near at 655,80 and 790,81 cm -1 are attributed to C-S bonding vibrations [19,20,22] and the band at 983,70 cm -1 is due to C=O stretching vibration of adsorbed CO 2 from ambient atmosphere [23]. The bands observed at 1126,43 and 1427,32 cm -1 were attributed to C-H bonding vibrations [18,23,24].…”

Motivación de emprendimiento turístico: panorámica basada en el análisis bibliométrico de la investigación empírica

“…Luego hay un pequeño grupo de investigaciones con temas más sociales, que estudiaron los motivos de emprendimiento en mujeres, parejas y jóvenes (por ejemplo, Beeka & Rimmington, 2011;Bensemann & Hall, 2010;Dieguez-Castrillon et al, 2012). En el 2016 el tema toma fuerza en revistas importantes, con estudios que refuerzan la motivación emprendedora turística en migrantes a zonas rurales de Noruega (Iversen & Jacobsen, 2016), género en Brasil (Costa et al, 2016), pequeñas y medianas empresas en tres Emiratos Árabes Unidos (Ahmad & Muhammad, 2016); y dos nuevos enfoques de la motivación,…”

Antibiofilm activity of Nigrospora sphaerica CL-OP30 endophytic extract against Streptococcus mutans - the causative agent of dental caries

“…The close association between endophytes and host plants is believed to be directly or indirectly involved in the production of secondary metabolites and other phytochemical constituents (Jia et al, 2016). Endophytes are known to play an important role in the well-being of host plants, particularly in the interactions with plant pathogens and the production of important secondary metabolites (Tarnecki et al, 2017;Sharma et al, 2020;Ahmad et al, 2021).…”