Trends and hotspots in environmental epigenetics of aquatic invertebrates: a CiteSpace and VOSviewer-based bibliometric study

The burgeoning field of environmental epigenetics is rapidly emerging as a critical tool for understanding how marine life adapts to a changing ocean, and this recent bibliometric analysis provides a valuable snapshot of its current landscape and future trajectory. The study’s use of CiteSpace and VOSviewer to map the field’s evolution highlights a significant shift, with research increasingly focused on transgenerational adaptation—a crucial area given the accelerating pace of environmental change. This aligns with broader ecological research demonstrating the far-reaching consequences of stressors on marine systems, as explored in our own reporting on Tracing species-specific kelp eDNA in marine sediments for blue carbon assessment along the Norwegian Coast, which underscores the importance of understanding ecological impacts on carbon cycling. Similarly, the challenges in managing coastal ecosystems, as illustrated by homeowner preferences for septic system inspection policies in coastal South Carolina Who should pay for septic system inspection? Homeowner preferences for mandatory time-of- property transfer policy: evidence from coastal South Carolina, highlight the need for a holistic understanding of environmental influences, including epigenetic mechanisms. The observed global research network, characterized by methodological and resource complementarity—pairing multi-omics sequencing expertise with regional marine stations—is a positive development, reflecting the inherently interdisciplinary nature of this research area.

The analysis’s identification of limitations within the field, however, is equally important. The over-reliance on DNA methylation as the primary epigenetic marker, and the restricted focus on a few, often aquaculture-related, species like mollusks, represent significant knowledge gaps. Expanding the scope of study to encompass a wider range of non-model organisms, particularly those foundational to benthic ecosystems, is essential for gaining a truly representative understanding of ocean resilience. Furthermore, the study rightly points out the tendency to overlook the inherent complexity of natural environmental conditions in experimental design. Controlled laboratory settings, while valuable for mechanistic studies, cannot fully replicate the dynamic interplay of stressors found in the real world. The shift toward longer-term experiments, incorporating multiple stressors and more realistic environmental conditions, is a necessary evolution to improve the predictive power of epigenetic research. This need for more comprehensive ecological understanding should also inform how we consider the impacts of seemingly localized events, as demonstrated by the expanding nursery habitat for Caribbean juvenile fish due to an introduced seagrass, Deep shift: an introduced seagrass, Halophila stipulacea, expands nursery habitat for Caribbean juvenile fish into deeper waters.

The dominance of China in publication volume, coupled with the United States’ central role in network connectivity, underscores the geopolitical dynamics shaping scientific advancement. While collaboration is clearly a strength—facilitating the exchange of methodologies and data—it also highlights potential dependencies and the need for broader participation from researchers across the globe. The importance of “in situ validation” – verifying laboratory findings within natural environments – is a pivotal recommendation. This emphasis on real-world validation is consistent with the broader trend in ecological research towards more integrated, field-based studies. The ability to translate epigenetic findings into actionable conservation strategies hinges on our capacity to accurately assess resilience under complex, natural conditions. The development of robust, validated biomarkers—epigenetic signatures indicative of environmental stress and adaptive capacity—will be crucial for monitoring ocean health and informing management decisions.

Looking ahead, the key question becomes: how can we effectively integrate epigenetic data into existing ocean monitoring programs and predictive models? The current focus on descriptive studies is naturally evolving toward mechanistic understanding, but the true value of environmental epigenetics will be realized when we can leverage this knowledge to forecast the response of marine ecosystems to future climate scenarios and human impacts. The integration of epigenetic data with traditional ecological metrics—such as species abundance, distribution, and physiological indicators—promises a more nuanced and predictive understanding of ocean resilience, ultimately informing more effective strategies for ocean stewardship.