Haplo-diplontic life cycle expands coccolithophore niche
Haplo-diplontic life cycle expands coccolithophore niche
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DOI：
10.5194/bg-18-1161-2021
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发表时间：
2021-02-16
期刊：
影响因子：
4.9
通讯作者：
Brownlee, Colin
中科院分区：
文献类型：
--
作者：
de Vries, Joost;Monteiro, Fanny;Brownlee, Colin
颗石藻是一种重要的海洋钙化浮游植物，具有单倍-双倍的生活史。单倍-双分体生活史允许颗石藻在两个生活史阶段中分裂，并可能扩大颗石藻生态位体积。然而，迄今为止，研究在很大程度上忽视了颗石藻的生命周期，而是集中在颗石藻的二倍体生命周期阶段。通过对2534个球形石藻的扫描电子显微镜（SEM）丰度数据的综合分析，我们发现，钙化的单倍体球形石藻通常只占球形石藻总丰度的一小部分（根据季节的不同，约占2%-15%）。然而，使用在大西洋和地中海的案例研究，我们表明，根据环境条件，钙化的单倍体颗石藻可以显着的贡献者的颗石藻常备股票（高达30%）。此外，使用超体积来量化颗石藻的生态位，我们说明了单倍体和二倍体生活史阶段居住在对比的生态位中，平均而言，这允许颗石藻扩大其生态位约18.8%，单个物种的范围为3%-76%.Our结果强调，未来的颗石藻研究应该考虑两个生活史阶段，由于目前的研究忽略了单倍体的生活史阶段，限制了我们对颗石藻生态学的理解。此外，我们的研究结果表明，营养限制和分层，这可能是相关的进一步的气候scenaries.Our汇编强调的空间和时间稀疏的SEM测量和需要新的分子技术来识别未钙化的单倍体颗石藻的不同反应。我们的工作还强调了需要进一步的碳酸盐化学生态位的颗石藻生命周期。
Coccolithophores are globally important marine calcifying phytoplankton that utilize a haplo-diplontic life cycle. The haplo-diplontic life cycle allows coccolithophores to divide in both life cycle phases and potentially expands coccolithophore niche volume. Research has, however, to date largely overlooked the life cycle of coccolithophores and has instead focused on the diploid life cycle phase of coccolithophores. Through the synthesis and analysis of global scanning electron microscopy (SEM) coccolithophore abundance approximate to data (n = 2534), we find that calcified haploid coccolithophores generally constitute a minor component of the total coccolithophore abundance (approximate to 2 %-15% depending on season). However, using case studies in the Atlantic Ocean and Mediterranean Sea, we show that, depending on environmental conditions, calcifying haploid coccolithophores can be significant contributors to the coccolithophore standing stock (up to 30 %). Furthermore, using hypervolumes to quantify the niche of coccolithophores, we illustrate that the haploid and diploid life cycle phases inhabit contrasting niches and that on average this allows coccolithophores to expand their niche by approximate to 18.8 %, with a range of 3 %-76% for individual species.Our results highlight that future coccolithophore research should consider both life cycle stages, as omission of the haploid life cycle phase in current research limits our understanding of coccolithophore ecology. Our results furthermore suggest a different response to nutrient limitation and stratification, which may be of relevance for further climate scenarios.Our compilation highlights the spatial and temporal sparsity of SEM measurements and the need for new molecular techniques to identify uncalcified haploid coccolithophores. Our work also emphasizes the need for further work on the carbonate chemistry niche of the coccolithophore life cycle.