Marine Biological Parameter Prediction

Marine ecosystems occasionally experience sudden population explosions (blooms) or rapid declines of specific organisms, disrupting ecological balance and human activities that depend on healthy aquatic environments. These biological changes typically originate at one trophic level and subsequently propagate throughout the food web. Excessive growth of a single species can alter predator–prey relationships, reduce biodiversity, and, in severe cases, lead to widespread mortality of marine organisms by disrupting the stability of the ecosystem.

One of the most common examples is the rapid increase in phytoplankton or microalgae resulting from excessive nutrient enrichment. Elevated nutrient concentrations may trigger harmful algal blooms (HABs), which can severely impact marine ecosystems through several mechanisms. The first group consists of non-toxic algae—such as certain cyanobacteria, diatoms, and macroalgae—that become harmful when excessive biomass consumes large amounts of dissolved oxygen, causing hypoxia and resulting in the death of fish, invertebrates, and other aquatic organisms. The second group includes toxin-producing species, particularly toxic cyanobacteria and dinoflagellates, whose toxins accumulate through the food web via bioaccumulation and may cause extensive ecological damage as well as risks to human health. The third group comprises non-toxic species, including some diatoms, dinoflagellates, and raphidophytes, that possess sharp spines or other physical structures capable of damaging fish gills and delicate tissues, reducing growth, increasing physiological stress, and causing mortality.

Algal blooms may also produce significant environmental changes beyond direct biological impacts. Dense algal populations can alter pH, increase water turbidity, and reduce light penetration, thereby limiting the growth of seagrass beds and degrading critical marine habitats. When blooms collapse, decomposition consumes large quantities of dissolved oxygen and accelerates nitrogen cycling, further degrading water quality. In addition, harmful blooms can negatively affect coastal tourism by reducing water clarity, creating unpleasant conditions, and posing health risks to recreational users.

Similar ecological disturbances may occur when populations of other marine organisms increase or decline abruptly, disrupting food-web dynamics and affecting fisheries, aquaculture, tourism, and other marine industries. Advanced numerical modeling provides an effective scientific tool for forecasting biological changes, understanding the processes that drive ecosystem disturbances, and developing strategies to minimize or prevent future biological imbalances.