Coiling directions in the planktonic foraminifer Pulleniatina: A complex eco-evolutionary dynamic spanning millions of years.
Coiling directions in the planktonic foraminifer Pulleniatina: A complex eco-evolutionary dynamic spanning millions of years.
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DOI：
10.1371/journal.pone.0249113
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Penny L
中科院分区：
文献类型：
--
作者：
Pearson PN;Penny L
浮游有孔虫是异养有性繁殖的海洋原生生物，具有非常完整的化石记录，为长期的进化模式和过程提供了独特的见解。种群通常表现出对右（右旋）或左（左旋）壳的强烈偏好。跨越数百万年的深海沉积物岩心显示，一些物种的主要卷曲方向随着时间的推移出现了大幅度而且往往是快速的波动。这是有用的生物地层对比，但需要进一步的工作，以了解人口动态过程，驱动这些波动。在这里，我们解决的情况下，螺旋波动在南极有孔虫属Pulleniatina的基础上，新的高分辨率计数从两个最近恢复的沉积物芯从印尼通流在热带西太平洋和印度洋（国际海洋发现计划网站U1486和U1483）。我们使用单标本的稳定同位素分析表明，右旋和左旋壳从相同的沉积物样品可以显示出显着的差异，在碳和氧同位素，这意味着一定程度的种群之间的生态分离。在一个案例中，我们检测到一个显着差异的大小之间的右旋和左旋标本。我们认为，卷曲率的主要波动是由神秘的人口取代竞争性扫描，一种模式的进化，更经常与无性生物体比与经典的“生物物种概念”。
Planktonic foraminifera are heterotrophic sexually reproducing marine protists with an exceptionally complete fossil record that provides unique insights into long-term patterns and processes of evolution. Populations often exhibit strong biases towards either right (dextral) or left (sinistral) shells. Deep-sea sediment cores spanning millions of years reveal that some species show large and often rapid fluctuations in their dominant coiling direction through time. This is useful for biostratigraphic correlation but further work is required to understand the population dynamical processes that drive these fluctuations. Here we address the case of coiling fluctuations in the planktonic foraminifer genus Pulleniatina based on new high-resolution counts from two recently recovered sediment cores from either side of the Indonesian through-flow in the tropical west Pacific and Indian Oceans (International Ocean Discovery Program Sites U1486 and U1483). We use single-specimen stable isotope analyses to show that dextral and sinistral shells from the same sediment samples can show significant differences in both carbon and oxygen isotopes, implying a degree of ecological separation between populations. In one case we detect a significant difference in size between dextral and sinistral specimens. We suggest that major fluctuations in coiling ratio are caused by cryptic populations replacing one another in competitive sweeps, a mode of evolution that is more often associated with asexual organisms than with the classical ‘biological species concept’.
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影响因子：
56.9
作者：
BANDY, OL
通讯作者：
BANDY, OL
影响因子：
9.8
作者：
Davison, A;Chiba, S;Clarke, B
通讯作者：
Clarke, B
影响因子：
--
作者：
Darling, KF;Wade, CM;Bijma, J
通讯作者：
Bijma, J
DOI：
10.2307/1484667
发表时间：
1967-01-01
期刊：
MIC ROP ALE ONTOLOGY [NEW YORK]
影响因子：
--
作者：
BANNER, F. T.;BLOW, W. H.
通讯作者：
BLOW, W. H.
影响因子：
--
作者：
Darling, KF;Kucera, M;Pak, D
通讯作者：
Pak, D