Impact of Nutrient Enrichment on Community Structure and Co-Occurrence Networks of Coral Symbiotic Microbiota in Duncanopsammia peltata: Zooxanthellae, Bacteria, and Archaea

Microorganisms, Journal Year: 2024, Volume and Issue: 12(8), P. 1540 - 1540

Published: July 27, 2024

Symbiotic microorganisms in reef-building corals, including algae, bacteria, archaea, fungi, and viruses, play critical roles the adaptation of coral hosts to adverse environmental conditions. However, their functional relationships nutrient-rich environments have yet be fully explored. This study investigated Duncanopsammia peltata surrounding seawater sediments from protected non-protected areas summer winter Dongshan Bay. High-throughput sequencing was used characterize community changes, co-occurrence patterns, factors influencing symbiotic (zooxanthellae, archaea) different environments. The results showed that nutrient enrichment greatest December, followed by area August. In contrast, August had lowest enrichment. Significant differences were found composition bacterial archaeal communities regions. Among microorganisms, main dominant species zooxanthellae is C1 subspecies (42.22–56.35%). phyla bacteria Proteobacteria, Cyanobacteria, Firmicutes, Bacteroidota. Only did a large number (41.98%) SAR324_cladeMarine_group_B exist. December contained beneficial as biomarkers. They Nisaea, Spiroplasma, Endozoicomonas, Bacillus. No pathogenic appeared phylum Archaea Crenarchaeota. These microorganisms’ relative abundances compositions vary with changes. dissolved inorganic nitrogen media key factor affecting microbial communities. Co-occurrence analysis under anthropogenic disturbances enhanced interactions between microorganisms. findings improve our understanding adaptations holobionts various nutritional

Language: Английский

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Growth rates of five coral species across a strong environmental gradient in the Colombian Caribbean

Marine Biology, Journal Year: 2024, Volume and Issue: 171(9)

Published: Aug. 30, 2024

Abstract Coral calcification is critical for reef growth and highly dependent on environmental conditions. Yet, little known about how corals calcify under sub-optimal conditions (e.g., turbid waters, high nutrients, sedimentation) or coral in understudied regions such as the Colombian Caribbean. We therefore assessed linear extension rates of five species across an inshore-to-offshore gradient A suite variables (temperature, light intensity, visibility, pH, nutrients) measured during rainy season (May – November 2022) demonstrated more inshore compared to offshore. Across all species, were 59% 37% lower offshore midshore sites, respectively. massive calcified up 92% than branching but susceptible heat stress However, had reduced survival due extreme climatic events (i.e., bleaching, hurricanes). comparison with published wider Caribbean revealed that grow 11 times those while generally have similar rates, this finding may been influenced by fragment size and/or stress. Our findings indicate present-day conditions, coupled frequent events, will favor over areas This suggests a possible shift towards faster calcifying future communities, possibly exacerbating ongoing regional decline last decades.

Language: Английский

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Exploring the Status of an Urban Coral and the Presence of Potential Probiotic Traits in Culturable Bacteria

Journal of Marine Science and Engineering, Journal Year: 2023, Volume and Issue: 11(10), P. 2006 - 2006

Published: Oct. 18, 2023

Improving the availability of new sources probiotics is essential to continue implementing alternative solutions improve coral health; one such source urban corals. However, little known about coral’s health status and whether they can harbor bacteria exhibiting probiotic traits. Here, we explored Madracis auretenra presence traits in its associated culturable bacteria. After assessing ecological attributes, observed a similar abundance (cover %) when comparing patches M. occurring both an site marine protected area. The patch also exhibited high vibrios tissues signs ecosystem deterioration. this showed “good” index condition; so, hypothesized beneficial We isolated 132 bacterial strains from healthy auretenra. These were affiliated with 11 genera, including Vibrio, Shewanella, Bacillus, Exiguobacterium, Priestia, Niallia, among others. Screenings revealed predominant potential as catalase, antiQS, production siderophores activities isolates. proposed list 24 isolates precandidates that jointly three or more these traits, which Vibrio Bacilli stand out. provide insights into

Language: Английский

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Sentinels for future coral reef conditions: assessment of environmental variability and water quality in semi-enclosed inland bays in the southern Caribbean

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: Oct. 6, 2023

Abstract The mangrove-seagrass-coral reef continuum is of immense ecological and socio-economic importance, supporting biodiversity, carbon storage, coastal protection, fisheries, tourism. presence extreme environmental conditions along this could support adaptive refugia for climate-sensitive taxa such as reef-building corals but physicochemical are rarely assessed at sufficient spatiotemporal resolution. Furthermore, development low water quality increasingly threaten these interconnected ecosystems. Yet, time-integrated pollution monitoring absent most locations. Here, we used a multi-disciplinary approach to assess benthic cover, coral diversity, >20 abiotic parameters characterizing two mangrove- seagrass-dominated inland bays nearby reefs in Curaçao (southern Caribbean) during the cool, dry season warm, wet season. This was combined with using bioindicators nutrients trace metal (inland only), passive samplers bioassays organic chemical (all four sites) revealed previously undocumented extent strong diel seasonal variability bays, temperature, pH dissolved oxygen frequently reaching values predicted under moderate-to-severe future climate scenarios. In addition, had greater nutrient concentrations (especially ammonium) ecotoxicological risks than due run-off, industrial- wastewater effluents, ports boating. Overall, our findings show that Curaçao’s have significant potential serve natural laboratories study effects ocean on resident situ . however applies within context fluctuations caveat co-occurring stressors. Our work confirms important role mangrove seagrass habitats resilience hotspots also highlights urgent need improve monitoring, protection valuable continuum.

Language: Английский

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