The haplo-diplontic life cycle expands niche space of coccolithophores
The haplo-diplontic life cycle expands niche space of coccolithophores
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DOI：
10.5194/bg-2020-194
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发表时间：
2020-06
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通讯作者：
Joost de Vries;F. Monteiro;Glen L. Wheeler;A. Poulton;J. Godrijan;F. Cerino;E. Malinverno;G. Langer-G.-La
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作者：
Joost de Vries;F. Monteiro;Glen L. Wheeler;A. Poulton;J. Godrijan;F. Cerino;E. Malinverno;G. Langer-G.-La
抽象的。颗石藻是全球重要的海洋钙化浮游植物，利用单倍体生命周期。单倍体二倍体生命周期允许颗石藻在两个生命周期阶段进行分裂，并且已被提议允许颗石藻扩大其生态位空间。然而，迄今为止的研究在很大程度上忽视了颗石藻的生命周期，而是集中在二倍体生命周期阶段。通过综合全球扫描电子显微镜 (SEM) 颗石藻丰度数据 (n = 2534)，我们表明单倍体生命周期阶段对颗石藻丰度有显着贡献，约占定义单倍体-二倍体对的物种丰度的 18%。使用超体积来量化颗石藻的生态位空间，我们进一步表明单倍体和二倍体生命周期阶段栖息在对比的生态位中，这使得颗石藻能够将其生态位空间扩大约 17%。我们的结果强调，未来的颗石藻研究应考虑两个生命周期阶段，因为当前研究中省略单倍体生命周期阶段限制了我们对颗石藻生态学的理解。
Abstract. 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 has been proposed to allow coccolithophores to expand their niche space. To-date research has however largely overlooked the life cycle of coccolithophores, and has instead focused on the diploid life cycle phase. Through a synthesis of global scanning electron microscopy (SEM) coccolithophore abundance data (n = 2534), we show that the haploid life cycle phase contributes significantly to coccolithophore abundance, constituting ≈18 % of species abundance for which haploid-diploid pairs are defined. Using hypervolumes to quantify the niche space of coccolithophores, we furthermore show that the haploid and diploid life cycle phases inhabit contrasting niches, and that this allows coccolithophores to expand their niche space by ≈17 %. 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.