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<p>Micropropagules are the reproductive and dispersal means of macroalgae, often linked to green macroalgal blooms in eutrophicated coastal areas. In San Antonio Bay (North Patagonia, Argentina), increased nutrients have led to <i>Ulva</i> spp. blooms in spring and early summer, coinciding with high <i>Ulva</i> spp. micropropagule (MPU) density at low tide. This study aimed to describe the variation in MPU densities throughout a year and in a tidal cycle and their relationship with environmental variables. For this, MPU density, macroalgal biomass, weight of mature and immature thalli, and seawater physical and chemical variables were determined: (1) with a monthly frequency for a year at low tide, (2) during a tidal cycle at one-hour intervals covering the low tide period, and (3) at different depths in the water column during daytime and nighttime high tides. Maximum MPU density (33,983 ± 9553 cel ml<sup>−1</sup>) occurred in February, while macroalgal biomass peaked in December. MPU density, seawater temperature, salinity, chlorophyll-a, and nutrients increased during low tide but decreased at high tide, with no evidence of vertical stratification. MPU density was positively associated with seawater temperature during low tide and throughout the year. We conclude that in an environment where nutrients and light are not limiting, MPU variation is associated with seawater temperature annually and with tidal action daily. High MPU densities during summer raise chlorophyll and dissolved oxygen levels, while tidal flow dilutes and exports MPU. These results provide insights into the dynamics of the dispersal phase of an opportunistic and globally distributed green algal genus. </p>

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Seawater Temperature and Tidal Action as Modulators of Ulva Spp. Micropropagules Density in a Eutrophicated Macrotidal Coastal System

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • M. A. Caniguan,
  • M. E. Becherucci,
  • M. Gastaldi,
  • M. A. Narvarte,
  • J. F. Saad

摘要

Micropropagules are the reproductive and dispersal means of macroalgae, often linked to green macroalgal blooms in eutrophicated coastal areas. In San Antonio Bay (North Patagonia, Argentina), increased nutrients have led to Ulva spp. blooms in spring and early summer, coinciding with high Ulva spp. micropropagule (MPU) density at low tide. This study aimed to describe the variation in MPU densities throughout a year and in a tidal cycle and their relationship with environmental variables. For this, MPU density, macroalgal biomass, weight of mature and immature thalli, and seawater physical and chemical variables were determined: (1) with a monthly frequency for a year at low tide, (2) during a tidal cycle at one-hour intervals covering the low tide period, and (3) at different depths in the water column during daytime and nighttime high tides. Maximum MPU density (33,983 ± 9553 cel ml−1) occurred in February, while macroalgal biomass peaked in December. MPU density, seawater temperature, salinity, chlorophyll-a, and nutrients increased during low tide but decreased at high tide, with no evidence of vertical stratification. MPU density was positively associated with seawater temperature during low tide and throughout the year. We conclude that in an environment where nutrients and light are not limiting, MPU variation is associated with seawater temperature annually and with tidal action daily. High MPU densities during summer raise chlorophyll and dissolved oxygen levels, while tidal flow dilutes and exports MPU. These results provide insights into the dynamics of the dispersal phase of an opportunistic and globally distributed green algal genus.