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<p>Invasive bivalves are important agents of ecological change in estuarine food webs, with the potential to influence nutrient cycling and community dynamics. The black mussel <i>Mytella strigata</i>, native to Central and South America, has recently spread to Southeast Asia, a range expansion likely facilitated by its broad salinity tolerance. However, its feeding performance under variable salinity and food conditions remains poorly understood, particularly in newly colonized regions. In this exploratory study, we quantified the clearance rates of <i>M. strigata</i> across a salinity gradient (low: 8 PSU; intermediate: 16 PSU; high: 29 PSU) under two feeding regimes: natural seston and monocultures of the diatom <i>Thalassiosira weissflogii</i>. Under seston conditions, clearance rates declined by 1.14% per hour (Estimate = − 0.0115, <i>p</i> &lt; 0.0001, <i>n</i> = 15) and decreased by 15.9% for each ppm increase in total suspended solids (Estimate = − 0.1587, <i>p</i> = 0.0002, <i>n</i> = 15). Clearance rates at low salinity were 18.9% higher than at intermediate salinity (Estimate = 0.1734, <i>p</i> = 0.0002), while no difference was observed between intermediate and high salinity levels (<i>p</i> = 0.637). Additionally, elevated total suspended solids were associated with reduced variance in clearance rates, suggesting that particulate stress may constrain the range of physiological responses. Under the monoalgal diet, clearance rate at low salinity decreased by 71% compared to intermediate salinity (Estimate = − 0.846, <i>p</i> &lt; 0.0001, <i>n</i> = 15), with no measurable effect at higher salinity (Estimate = 0.206, <i>p</i> = 0.178, <i>n</i> = 15). Time had no consistent influence. These findings suggest that <i>M. strigata</i> may exhibit context-dependent filtration performance influenced by salinity and food quality. While elevated particulate load and low-salinity stress reduce feeding efficiency, moderate salinity and diverse diets may support persistence. These results contribute to understanding invasion dynamics and estuarine species interactions under changing environmental conditions.</p>

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Exploratory Analysis of Clearance Rates and Feeding Constraints in the Invasive Black Mussel Mytella strigata (Hanley, 1843) Across Salinity and Seston Gradients

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Kaent Immanuel N. Uba,
  • Robert Keith A. Sienes,
  • Michael H. Flores,
  • Hessed T. Cabanilla,
  • Gaireen D. Gaid,
  • Junaisah Nissi L. Degoma,
  • Delyn M. Bucay,
  • Ruby C. Gonzales

摘要

Invasive bivalves are important agents of ecological change in estuarine food webs, with the potential to influence nutrient cycling and community dynamics. The black mussel Mytella strigata, native to Central and South America, has recently spread to Southeast Asia, a range expansion likely facilitated by its broad salinity tolerance. However, its feeding performance under variable salinity and food conditions remains poorly understood, particularly in newly colonized regions. In this exploratory study, we quantified the clearance rates of M. strigata across a salinity gradient (low: 8 PSU; intermediate: 16 PSU; high: 29 PSU) under two feeding regimes: natural seston and monocultures of the diatom Thalassiosira weissflogii. Under seston conditions, clearance rates declined by 1.14% per hour (Estimate = − 0.0115, p < 0.0001, n = 15) and decreased by 15.9% for each ppm increase in total suspended solids (Estimate = − 0.1587, p = 0.0002, n = 15). Clearance rates at low salinity were 18.9% higher than at intermediate salinity (Estimate = 0.1734, p = 0.0002), while no difference was observed between intermediate and high salinity levels (p = 0.637). Additionally, elevated total suspended solids were associated with reduced variance in clearance rates, suggesting that particulate stress may constrain the range of physiological responses. Under the monoalgal diet, clearance rate at low salinity decreased by 71% compared to intermediate salinity (Estimate = − 0.846, p < 0.0001, n = 15), with no measurable effect at higher salinity (Estimate = 0.206, p = 0.178, n = 15). Time had no consistent influence. These findings suggest that M. strigata may exhibit context-dependent filtration performance influenced by salinity and food quality. While elevated particulate load and low-salinity stress reduce feeding efficiency, moderate salinity and diverse diets may support persistence. These results contribute to understanding invasion dynamics and estuarine species interactions under changing environmental conditions.