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Life-cycle alternations in Alexandrium minutum natural populations from the NW Mediterranean Sea

机译：地中海西北部亚历山大细叶自然种群的生命周期变化

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摘要

Life-cycle transitions play a key role in the bloom dynamics of many dinoflagellates. In this study, in situ excystment and encystment were monitored during recurrent Alexandrium minutum blooms in Arenys de Mar harbor (NW Mediterranean Sea) from October 2005 to May 2008. In addition, the dynamics of vegetative cells in the water column and resting cysts in the sediments were assessed. Excystment occurred continuously during the period studied. The excystment fluxes and the estimated excystment percentages indicated a pattern of alternating reduced and active excystment periods. From July to November, excystment percentages were <0.1%, whereas from December to June the A. minutum population underwent active excystment, with excystment percentages of 0.3-45.7%. Periods of active excystment coincided with increases in irradiance and water temperature, conditions also favorable for bloom development. During vegetative cell blooms, resting cyst formation coincided with periods marked by vegetative cell abundances in the water column of >2×10~3 cells 1~(-1). Resting cyst fluxes were higher when the abundance of vegetative cells in the overlying water column was greater. The excystment and encystment processes overlapped for 2 months during the extended blooms, indicating that newly formed resting cysts had overcome the mandatory dormancy period and were capable of germinating within the same bloom in which they were produced. Resting cysts in the surface sediment were rapidly depleted during periods of active excystment, but their production, although involving only a small fraction of the vegetative population, more than compensated for their loss. These results are discussed with respect to the role of frequent life-stage switches in determining the population dynamics and the maintenance of A minutum blooms.
机译：生命周期转变在许多鞭毛藻的开花动态中起着关键作用。在这项研究中，监测了2005年10月至2008年5月在Arenys de Mar港口（地中海西北部）反复出现亚历山大细小藻的过程中的原位囊肿和囊肿情况。此外，水柱中的营养细胞和囊中静止的囊肿动态评估沉积物。在研究期间持续发生囊肿。囊肿通量和估计的囊肿百分率表明交替的减少和活跃的囊肿周期。从7月到11月，囊肿百分比<0.1％，而从12月到6月，小曲霉种群进行了主动囊肿，囊肿百分比为0.3-45.7％。活跃的包囊期与辐照度和水温升高同时发生，条件也有利于水华的形成。在营养细胞开花期间，静止的囊肿形成与水柱中营养细胞丰度大于2×10〜3个细胞1〜（-1）的时期相吻合。当上方水柱中的营养细胞丰度较大时，静息囊肿通量较高。在延长的开花过程中，囊肿和囊化过程重叠了2个月，这表明新形成的静止囊肿已经克服了强制休眠期，并且能够在产生它们的同一束花朵中发芽。在活跃的剥蚀过程中，表面沉积物中的静止囊肿迅速耗尽，但是尽管它们的生长只占营养种群的一小部分，但其损失却可以弥补损失。这些结果是关于频繁的生命阶段转换在确定种群动态和维持A minutum绽放中的作用方面进行讨论的。

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  • 来源
    《Harmful Algae》 |2012年第4期|p.1-11|共11页
  • 作者

    Silvia AnglesEsther; Garces; Albert Rene; Nagore Sampedro;

  • 作者单位

    Institut de Giencies del Mar (CSIC), Pg. Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

    Institut de Giencies del Mar (CSIC), Pg. Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

    Institut de Giencies del Mar (CSIC), Pg. Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

    Institut de Giencies del Mar (CSIC), Pg. Maritim de la Barceloneta, 37-49, 08003 Barcelona, Spain;

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  • 关键词

    bloom dynamics; coastal zone; encystment; excystment; harmful algal bloom; resting cyst;

    机译：绽放动态沿海地区包囊囊肿有害藻华静息囊肿;

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