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<p>Temperature is usually the leading factor for phenological patterns in temperate regions. In contrast, temperature changes in tropical regions are minor while seasonally recurring shifts of wind patterns lead to variable lacustrine environments, especially through variable freshwater input and evaporative enrichment. For the characterization of the seasonal variability of the ostracod fauna in tropical Lago Enriquillo (Dominican Republic), twenty sediment surface samples obtained in March and September 2022 were analyzed. <i>Cyprideis similis</i> (Brady, 1869) was numerously present at similar, shallow water depths in both seasons indicating that these populations are intra-annually stable. The dry season of the lake was characterized by the co-occurrence of <i>Thalassocypria</i> cf. <i>sarbui</i> Maddocks &amp; Iliffe, 1993. <i>Perissocytheridea cribrosa</i> (Klie, 1933) was absent during the dry season but formed locally larger populations during the wet season while <i>T.</i> cf. <i>sarbui</i> was still present but in much lower abundances. <i>P. cribrosa</i> was present throughout the lake in most of the dead assemblages indicating a highly variable lake environment. The dominant temporally changing factor impacting the ostracod faunas appears to be the changing wind pattern. It is associated with changing water column mixing and leads to temporally changing levels of water oxygenation, i.e., profundal anoxia during the wet season, restricting living ostracod faunas to the upper 14.2&#xa0;m of the lake. In addition, the ostracods show a spatially variable pattern which might be related to variable levels of freshwater input. Thus, our results indicate that hydrological changes of Lago Enriquillo affect the ostracod fauna and their phenological pattern.</p>

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Spatio-temporal distribution of ostracod species assemblages in Lago Enriquillo, SW Dominican Republic: A question of precipitation?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月17日

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  • Christopher Berndt,
  • Torsten Haberzettl,
  • Berenice Matias Marte de Reyes,
  • Edwin Garcia Cocco,
  • Claudia Wrozyna

摘要

Temperature is usually the leading factor for phenological patterns in temperate regions. In contrast, temperature changes in tropical regions are minor while seasonally recurring shifts of wind patterns lead to variable lacustrine environments, especially through variable freshwater input and evaporative enrichment. For the characterization of the seasonal variability of the ostracod fauna in tropical Lago Enriquillo (Dominican Republic), twenty sediment surface samples obtained in March and September 2022 were analyzed. Cyprideis similis (Brady, 1869) was numerously present at similar, shallow water depths in both seasons indicating that these populations are intra-annually stable. The dry season of the lake was characterized by the co-occurrence of Thalassocypria cf. sarbui Maddocks & Iliffe, 1993. Perissocytheridea cribrosa (Klie, 1933) was absent during the dry season but formed locally larger populations during the wet season while T. cf. sarbui was still present but in much lower abundances. P. cribrosa was present throughout the lake in most of the dead assemblages indicating a highly variable lake environment. The dominant temporally changing factor impacting the ostracod faunas appears to be the changing wind pattern. It is associated with changing water column mixing and leads to temporally changing levels of water oxygenation, i.e., profundal anoxia during the wet season, restricting living ostracod faunas to the upper 14.2 m of the lake. In addition, the ostracods show a spatially variable pattern which might be related to variable levels of freshwater input. Thus, our results indicate that hydrological changes of Lago Enriquillo affect the ostracod fauna and their phenological pattern.