The International Journal of Deep Sea and Marine Ecosystems (IJDSME) publishes its latest research contributions, reviews, and case studies on a quarterly basis. Our current issue features cutting-edge research on marine biodiversity, deep-sea exploration technologies, and sustainable practices for preserving fragile underwater ecosystems.
Featured Articles in the Latest Issue
- Volume 3 (Issue 1) JANUARY- JUNE 2026
Volume 3 (Issue 1) JANUARY- JUNE 2026 Research Articles
Autonomous Bioacoustic Monitoring of Mesopelagic Fish Assemblages Along the Mid-Atlantic Ridge
Vol.3(1); Pages:1-13. Published on April-2026
Abstract
Mesopelagic ecosystems constitute one of the least explored biological domains on Earth despite their essential contribution to global nutrient transport and oceanic carbon cycling. This study evaluated the effectiveness of autonomous bioacoustic monitoring platforms for documenting mesopelagic fish assemblages along selected sectors of the Mid-Atlantic Ridge. Passive acoustic sensors were deployed at depths ranging from 600 to 1800 meters over a six-month observational period. Acoustic signatures were processed using machine-learning assisted classification methods to distinguish species-specific movement and communication patterns. The findings revealed significant diel vertical migration patterns associated with seasonal productivity fluctuations and localized thermal gradients. Distinct acoustic clusters corresponded with lanternfish, bristlemouth, and dragonfish populations, indicating that passive monitoring can provide reliable estimates of biodiversity distribution in deep pelagic habitats. Environmental variables such as dissolved oxygen concentration and particulate organic carbon flux demonstrated measurable influence on species aggregation intensity. The study further identified previously undocumented nocturnal acoustic behaviors associated with feeding events near hydrographic transition zones. The integration of automated acoustic surveillance with oceanographic profiling significantly improved ecosystem characterization while reducing the operational limitations associated with crewed deep-sea expeditions. These findings support the broader application of autonomous monitoring systems for long-term assessment of biodiversity resilience under changing climatic conditions and increasing anthropogenic pressure in deep marine ecosystems.
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Geochemical Drivers of Microbial Sulfur Cycling in Hydrothermal Vent Sediments of the Southwest Pacific Basin
Vol.3(1); Pages:14-25. Published on May-2026
Abstract
Hydrothermal vent ecosystems sustain highly specialized microbial communities that mediate essential biogeochemical transformations within deep-sea environments. This investigation examined the relationship between sediment geochemistry and microbial sulfur cycling across hydrothermal vent systems located in the Southwest Pacific Basin. Sediment cores collected from active and inactive vent fields were analyzed for sulfur isotope composition, mineral abundance, microbial diversity, and enzymatic activity associated with sulfate reduction and sulfur oxidation pathways. Laboratory incubations under controlled thermal and chemical conditions revealed that sulfide concentration gradients strongly influenced microbial metabolic diversity and biomass productivity. High-throughput genomic sequencing identified multiple sulfur-oxidizing bacterial taxa adapted to fluctuating thermal conditions and elevated metal concentrations. The results demonstrated that active vent sediments exhibited accelerated sulfur turnover rates compared with adjacent inactive sites, contributing significantly to localized nutrient regeneration. Statistical modeling further indicated that iron sulfur mineral interactions enhanced microbial colonization stability in chemically dynamic habitats. The study also documented evidence of cooperative metabolic interactions between archaeal and bacterial populations involved in sulfur transformation pathways. These observations provide important insights into the ecological functioning of hydrothermal microbial ecosystems and their contribution to deep-ocean elemental cycling. The findings highlight the importance of integrating geochemical and microbiological approaches to improve understanding of ecosystem adaptation mechanisms within extreme marine environments increasingly affected by tectonic and climatic variability.
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Influence of Submarine Canyon Hydrodynamics on Cold-Water Coral Community Structure in the Northeast Atlantic
Vol.3(1); Pages:26-37. Published on May-2026
Abstract
Cold-water coral ecosystems provide essential structural habitat for numerous deep-sea organisms and play an important role in benthic biodiversity maintenance. This study investigated the influence of submarine canyon hydrodynamics on the spatial organization and ecological resilience of cold-water coral communities in the Northeast Atlantic Ocean. Remotely operated vehicle surveys were combined with hydrodynamic current modeling and benthic substrate analyses across three canyon systems exhibiting varying flow intensities and sediment transport patterns. The results demonstrated that coral colony density and species richness were strongly associated with moderate current regimes that enhanced suspended organic matter delivery while minimizing sediment burial stress. Areas subjected to turbulent flow conditions exhibited fragmented coral assemblages with reduced structural complexity and lower juvenile recruitment rates. Statistical analysis revealed that local topographic variability significantly influenced larval settlement and nutrient accessibility within canyon habitats. The study further identified distinct biological associations between coral frameworks and mobile invertebrate populations, emphasizing the ecological significance of habitat heterogeneity in supporting trophic connectivity. Environmental stress indicators, including ocean acidification exposure and thermal anomalies, were observed to reduce calcification efficiency in several dominant coral taxa. These findings demonstrate the sensitivity of deep-sea coral ecosystems to hydrodynamic disturbance and changing oceanographic conditions. The research contributes valuable ecological information for conservation planning and sustainable management strategies targeting vulnerable marine ecosystems within submarine canyon environments.
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Carbon Sequestration Potential of Abyssal Sediment Microfauna Under Simulated Ocean Warming Conditions
Vol.3(1); Pages:38-48. Published on May-2026
Abstract
Deep-sea abyssal sediments serve as critical reservoirs for long-term carbon storage, yet the influence of ocean warming on sedimentary microfaunal processes remains insufficiently understood. This study assessed the carbon sequestration potential of abyssal sediment microfauna under experimentally simulated warming conditions representative of projected climate change scenarios. Sediment samples collected from the Southern Indian Ocean abyssal plain were maintained within pressurized mesocosm chambers and exposed to incremental temperature increases over a twelve-week period. Measurements included microbial respiration, meiofaunal abundance, organic carbon remineralization rates, and sediment oxygen consumption. Experimental warming significantly altered trophic interactions within sediment communities, leading to accelerated decomposition of particulate organic matter and increased carbon dioxide release. However, several microfaunal assemblages demonstrated adaptive metabolic responses that partially stabilized carbon burial efficiency under moderate thermal stress. The study identified nematode-dominated communities as important regulators of organic matter redistribution and sediment bioturbation dynamics. Additionally, elevated temperatures were associated with shifts in microbial community composition that favored opportunistic taxa with higher respiration efficiency. The interaction between thermal stress and oxygen limitation emerged as a key determinant of ecosystem carbon retention capacity. These findings provide new evidence regarding the vulnerability of abyssal carbon sinks to climate-driven environmental change. Improved understanding of benthic carbon processing mechanisms is essential for refining global climate models and predicting future alterations in deep-sea biogeochemical cycling under continued ocean warming.
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Ecological Recovery Patterns Following Experimental Disturbance of Polymetallic Nodule Habitats in the Central Pacific
Vol.3(1); Pages:49-60. Published on June-2026
Abstract
The increasing commercial interest in polymetallic nodule extraction has intensified concern regarding the ecological vulnerability of abyssal seabed habitats. This longitudinal study examined recovery dynamics following controlled experimental disturbance within polymetallic nodule fields of the Central Pacific Ocean. Sediment displacement and substrate removal were conducted within designated study plots to simulate mining related physical impacts. Biological surveys, sediment chemistry analyses, and benthic imaging assessments were performed over an eighteen-month monitoring period. The results demonstrated substantial reductions in benthic biodiversity immediately following disturbance, particularly among sessile invertebrate and microbial communities dependent on hard-substrate attachment surfaces. Recovery trajectories varied significantly across taxonomic groups, with mobile scavengers exhibiting relatively rapid recolonization compared with slower-growing suspension feeders and microbial biofilm assemblages. Sediment compaction and altered geochemical gradients persisted throughout the observation period and contributed to delayed ecosystem stabilization. Statistical analyses indicated that habitat structural complexity and organic matter availability were major predictors of recolonization success. The study also identified long-term reductions in nutrient exchange efficiency within disturbed sediments, suggesting broader implications for abyssal ecosystem functioning. Although partial biological recovery was observed in several experimental plots, complete restoration of pre-disturbance ecological structure was not achieved within the study timeframe. These findings emphasize the ecological risks associated with deep-sea mineral extraction activities and support the development of precautionary management frameworks for protecting vulnerable abyssal ecosystems.
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