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<p>Macroalgae, as the dominant primary producers, play an important role in the south Caspian Sea in the rocky shore ecosystem food web. Recently, massive macroalgal blooms occur in this region every year. Studying water quality during the bloom is the first step to understanding the conditions that lead to extensive macroalgae growth in this area. Herein, spatio-seasonal distribution and biomass of the macroalgal community including three species <i>Cladophora glomerata, Ulva intestinalis</i>, and <i>Osmundea caspica</i> were investigated in 18 stations throughout the southern Caspian Sea shore line in relation to different environmental factors. In summer and autumn seasons 2021, <i>C. glomerata</i> was dominant species (90.3% and 70.1%, respectively), followed by <i>U. intestinalis</i> (9.7% and 26.5%, respectively). It was a strong variety of biomass along the coast (in 5–7 times) in a range of 30–470 gdw/m<sup>2</sup> in summer and nearly as twice as less in autumn, 15–250 gdw/m<sup>2</sup>, that the same sites exhibit maximum of biomass in both seasons (Ramsar, Dastak, Sisangam, Amir Abad). During the bloom, the daily oxygen fluctuation was measured at Ramsar station, which showed a severe anoxia conditions. The anoxia in the coastal waters negatively affected shallow-water habitats and caused a sharp decline in macroinvertebrate density after <i>C. glomerata</i> decomposition. According to statistical analysis results, water temperature was the most effective factor (in comparison to pH and nutrients) influenced on distribution and biomass of macroalgal community with contribution of 42.01%.</p>

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The South Caspian Sea macroalgal biodiversity: spatial and seasonal variability in macroalgal blooms

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Reza Rahnama,
  • Ahmad Radmanesh Manbohi,
  • Ali Hamzehpour,
  • Mehrshad Taheri,
  • Boris Chubarenko

摘要

Macroalgae, as the dominant primary producers, play an important role in the south Caspian Sea in the rocky shore ecosystem food web. Recently, massive macroalgal blooms occur in this region every year. Studying water quality during the bloom is the first step to understanding the conditions that lead to extensive macroalgae growth in this area. Herein, spatio-seasonal distribution and biomass of the macroalgal community including three species Cladophora glomerata, Ulva intestinalis, and Osmundea caspica were investigated in 18 stations throughout the southern Caspian Sea shore line in relation to different environmental factors. In summer and autumn seasons 2021, C. glomerata was dominant species (90.3% and 70.1%, respectively), followed by U. intestinalis (9.7% and 26.5%, respectively). It was a strong variety of biomass along the coast (in 5–7 times) in a range of 30–470 gdw/m2 in summer and nearly as twice as less in autumn, 15–250 gdw/m2, that the same sites exhibit maximum of biomass in both seasons (Ramsar, Dastak, Sisangam, Amir Abad). During the bloom, the daily oxygen fluctuation was measured at Ramsar station, which showed a severe anoxia conditions. The anoxia in the coastal waters negatively affected shallow-water habitats and caused a sharp decline in macroinvertebrate density after C. glomerata decomposition. According to statistical analysis results, water temperature was the most effective factor (in comparison to pH and nutrients) influenced on distribution and biomass of macroalgal community with contribution of 42.01%.