Scholarlink

<p>Seasonal phytoplankton dynamics are vital indicators of ecosystem variability in tropical coastal systems, particularly under monsoonal and interannual climatic influences. This study examined phytoplankton community composition and environmental drivers across the Northeast, Southwest, and Intermonsoon periods in Iligan and Murcielagos Bays, southern Philippines, from March 2023 to April 2024. Bi-monthly sampling at three stations per bay revealed strong spatiotemporal variation in nutrients and community structure, shaped by contrasting bay morphology and tidal regimes. A significant bay–season interaction explained 23.5% of environmental variance, reflecting differential environmental responses to monsoonal forcing shaped by local hydrographic conditions. This interaction was primarily driven by variation in temperature, salinity, nitrate, ammonia, and phosphate. Murcielagos Bay, being more enclosed, exhibited higher seasonal nutrient variability and phytoplankton turnover, with peaks in nitrate during the Northeast monsoon and in phosphate and ammonia during the Intermonsoon, supporting blooms of <i>Trichodesmium</i> and symbiotic diatoms. In contrast, Iligan Bay displayed more stable conditions, linked to spring tide-driven mixing. Diversity was highest during the Northeast monsoon but reflected community reorganization rather than increased richness. Moreover, indicator species analysis identified 19 genera strongly associated with specific bay–season contexts, indicating ecological partitioning. In addition, Generalized Additive Models revealed nonlinear, genus-specific responses to nitrate, salinity, and temperature, emphasizing the complex, non-monotonic nature of phytoplankton–environment interactions. These findings underscore the role of bay-specific geomorphology in shaping phytoplankton community responses to climate variability and highlight the need for seasonally adaptive and site-specific monitoring frameworks to inform conservation and fisheries management in dynamic tropical coastal ecosystems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Intra-annual Microphytoplankton and Environmental Responses To Monsoonal Forcing in Two Bays of the Southern Philippines

  • 期刊论文

  • 发表日期：

    2025年8月13日

查看全文
  • Kaent Immanuel N. Uba,
  • Gaireen D. Gaid,
  • Josuah D. Zalsos,
  • Lovella R. Calala,
  • Emilie G. Tubio

摘要

Seasonal phytoplankton dynamics are vital indicators of ecosystem variability in tropical coastal systems, particularly under monsoonal and interannual climatic influences. This study examined phytoplankton community composition and environmental drivers across the Northeast, Southwest, and Intermonsoon periods in Iligan and Murcielagos Bays, southern Philippines, from March 2023 to April 2024. Bi-monthly sampling at three stations per bay revealed strong spatiotemporal variation in nutrients and community structure, shaped by contrasting bay morphology and tidal regimes. A significant bay–season interaction explained 23.5% of environmental variance, reflecting differential environmental responses to monsoonal forcing shaped by local hydrographic conditions. This interaction was primarily driven by variation in temperature, salinity, nitrate, ammonia, and phosphate. Murcielagos Bay, being more enclosed, exhibited higher seasonal nutrient variability and phytoplankton turnover, with peaks in nitrate during the Northeast monsoon and in phosphate and ammonia during the Intermonsoon, supporting blooms of Trichodesmium and symbiotic diatoms. In contrast, Iligan Bay displayed more stable conditions, linked to spring tide-driven mixing. Diversity was highest during the Northeast monsoon but reflected community reorganization rather than increased richness. Moreover, indicator species analysis identified 19 genera strongly associated with specific bay–season contexts, indicating ecological partitioning. In addition, Generalized Additive Models revealed nonlinear, genus-specific responses to nitrate, salinity, and temperature, emphasizing the complex, non-monotonic nature of phytoplankton–environment interactions. These findings underscore the role of bay-specific geomorphology in shaping phytoplankton community responses to climate variability and highlight the need for seasonally adaptive and site-specific monitoring frameworks to inform conservation and fisheries management in dynamic tropical coastal ecosystems.