Harmful algal blooms of the dinoflagellate Pyrodinium bahamense have caused human and economic losses in the last decades. This study, for the first time, documents a bloom of P. bahamense in the Red Sea. The alga was recurrently present in a semi-enclosed lagoon throughout nearly 2 years of observations. The highest cell densities (10-10cellsL) were recorded from September to beginning of December at temperatures and salinities of ∼26-32°C and ∼41, respectively. The peak of the bloom was recorded mid-November, before a sharp decrease in cell numbers at the end of December. Minimum concentrations in summer were at ∼10cellsL. A saxitoxin ELISA immunoassay of cultures and water samples confirmed the toxicity of the strain found in the Red Sea. Moreover, a gene expression analysis of the saxitoxin gene domain SxtA4 showed that transcript production peaked at the culmination of the bloom, suggesting a relation between transcript production, sudden cells increment-decline, and environmental factors.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.hal.2016.03.002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Assessing the potential effects of climate change on the morphodynamics of the tropical coral reef islands in the Gulf of Mannar, Indian Ocean.
J Environ Manage
January 2025
Physical Oceanography Division, CSIR- National Institute of Oceanography, Dona Paula, 403 004, Goa, India; School of Oceanography, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India. Electronic address:
Low-lying and small tropical coral reef islands around the world are extremely vulnerable to the effects of global environmental change caused by the combination of anthropogenic climate change and escalating extreme hydrodynamic events. Erosion and inundation are anticipated to physically destabilize the tropical coral reef islands, rendering them uninhabitable within the next century. Therefore, it is crucial to assess the repercussions of these hazardous events on the delicate reef island ecosystem in order to conserve and ensure sustainable management.
View Article and Find Full Text PDFUnveiling the risk of marine litter and derelict fishing gear in remote coral reefs of the Andaman and Nicobar Islands, North Indian Ocean.
Mar Pollut Bull
January 2025
IGNOU Regional Centre, Trivandrum, Kerala 695 008, India.
An increasing amount of plastic litter and derelict fishing gear in the global oceans poses significant threats to corals and reef-associated marine biota. In this context, an underwater marine litter survey was conducted along the fringing coral reefs in the Andaman and Nicobar Islands- a remote archipelago in the Bay of Bengal, Northern Indian Ocean. The result revealed entanglement and smothering of coral colonies by plastic and derelict fishing gear.
View Article and Find Full Text PDFMarine heatwaves imperil emblematic reef fishes by altering the energetic landscape of coral reefs.
J Anim Ecol
January 2025
Department of Marine Science, Marine Science Institute, The University of Texas at Austin, Port Aransas, Texas, USA.
Marine heatwaves are increasingly common due to human-induced climate change. Under prolonged thermal stress on coral reefs, corals can undergo bleaching, leading to mass coral mortality and large-scale changes in benthic community composition. While coral mortality has clear, negative impacts on the body condition and populations of coral-dependent fish species, the mechanisms that drive these changes remain poorly resolved.
View Article and Find Full Text PDFGeographical patterns of intraspecific genetic diversity reflect the adaptive potential of the coral Pocillopora damicornis species complex.
PLoS One
January 2025
Institute for Global Ecology, Florida Institute of Technology, Melbourne, Florida, United States of America.
Marine heatwaves are increasing in intensity and frequency however, responses and survival of reef corals vary geographically. Geographical differences in thermal tolerance may be in part a consequence of intraspecific diversity, where high-diversity localities are more likely to support heat-tolerant alleles that promote survival through thermal stress. Here, we assessed geographical patterns of intraspecific genetic diversity in the ubiquitous coral Pocillopora damicornis species complex using 428 sequences of the Internal Transcribed Spacer 2 (ITS2) region across 44 sites in the Pacific and Indian Oceans.
View Article and Find Full Text PDFVanadate reduction by gram-positive fermentative bacteria isolated from deep-sea sediments on the northern Central Indian Ridge.
PLoS One
January 2025
School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea.
The oxidation states of vanadium determine its mobility and toxicity, and dissimilatory vanadate reduction has been reported in several microorganisms, highlighting the potential significance of this pathway in the remediation of vanadium contamination and the biogeochemical cycle. However, to date, most known microorganisms capable of reducing vanadate are Gram-negative respiratory bacteria belonging to the phylum Proteobacteria. In this study, we isolated Tepidibacter mesophilus strain VROV1 from deep-sea sediments on the northern Central Indian Ridge and investigated its ability to reduce vanadium and the impact of vanadate on its cellular metabolism.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!