Local intraspecific aggregation in phytoplankton model communities: spatial scales of occurrence and implications for coexistence

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Coralie Picoche, William R. Young, Frédéric Barraquand
{"title":"Local intraspecific aggregation in phytoplankton model communities: spatial scales of occurrence and implications for coexistence","authors":"Coralie Picoche, William R. Young, Frédéric Barraquand","doi":"10.1007/s00285-024-02067-y","DOIUrl":null,"url":null,"abstract":"<p>The coexistence of multiple phytoplankton species despite their reliance on similar resources is often explained with mean-field models assuming mixed populations. In reality, observations of phytoplankton indicate spatial aggregation at all scales, including at the scale of a few individuals. Local spatial aggregation can hinder competitive exclusion since individuals then interact mostly with other individuals of their own species, rather than competitors from different species. To evaluate how microscale spatial aggregation might explain phytoplankton diversity maintenance, an individual-based, multispecies representation of cells in a hydrodynamic environment is required. We formulate a three-dimensional and multispecies individual-based model of phytoplankton population dynamics at the Kolmogorov scale. The model is studied through both simulations and the derivation of spatial moment equations, in connection with point process theory. The spatial moment equations show a good match between theory and simulations. We parameterized the model based on phytoplankters’ ecological and physical characteristics, for both large and small phytoplankton. Defining a zone of potential interactions as the overlap between nutrient depletion volumes, we show that local species composition—within the range of possible interactions—depends on the size class of phytoplankton. In small phytoplankton, individuals remain in mostly monospecific clusters. Spatial structure therefore favours intra- over inter-specific interactions for small phytoplankton, contributing to coexistence. Large phytoplankton cell neighbourhoods appear more mixed. Although some small-scale self-organizing spatial structure remains and could influence coexistence mechanisms, other factors may need to be explored to explain diversity maintenance in large phytoplankton.</p>","PeriodicalId":2,"journal":{"name":"ACS Applied Bio Materials","volume":null,"pages":null},"PeriodicalIF":4.6000,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Bio Materials","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1007/s00285-024-02067-y","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, BIOMATERIALS","Score":null,"Total":0}
引用次数: 0

Abstract

The coexistence of multiple phytoplankton species despite their reliance on similar resources is often explained with mean-field models assuming mixed populations. In reality, observations of phytoplankton indicate spatial aggregation at all scales, including at the scale of a few individuals. Local spatial aggregation can hinder competitive exclusion since individuals then interact mostly with other individuals of their own species, rather than competitors from different species. To evaluate how microscale spatial aggregation might explain phytoplankton diversity maintenance, an individual-based, multispecies representation of cells in a hydrodynamic environment is required. We formulate a three-dimensional and multispecies individual-based model of phytoplankton population dynamics at the Kolmogorov scale. The model is studied through both simulations and the derivation of spatial moment equations, in connection with point process theory. The spatial moment equations show a good match between theory and simulations. We parameterized the model based on phytoplankters’ ecological and physical characteristics, for both large and small phytoplankton. Defining a zone of potential interactions as the overlap between nutrient depletion volumes, we show that local species composition—within the range of possible interactions—depends on the size class of phytoplankton. In small phytoplankton, individuals remain in mostly monospecific clusters. Spatial structure therefore favours intra- over inter-specific interactions for small phytoplankton, contributing to coexistence. Large phytoplankton cell neighbourhoods appear more mixed. Although some small-scale self-organizing spatial structure remains and could influence coexistence mechanisms, other factors may need to be explored to explain diversity maintenance in large phytoplankton.

Abstract Image

浮游植物模式群落中的局部种内聚集:发生的空间尺度及其对共存的影响
尽管浮游植物依赖相似的资源,但仍有多个物种共存,这通常可以用平均场模型来解释,即假定种群混合。实际上,对浮游植物的观察表明,在所有尺度上都存在空间聚集,包括在几个个体的尺度上。局部的空间聚集可能会阻碍竞争排斥,因为此时个体主要与同种的其他个体而不是不同物种的竞争者发生相互作用。为了评估微观尺度空间聚集如何解释浮游植物多样性的维持,需要在水动力环境中对细胞进行基于个体的多物种表征。我们建立了一个三维、基于多物种个体的科尔莫哥洛夫尺度浮游植物种群动力学模型。我们结合点过程理论,通过模拟和空间矩方程的推导对该模型进行了研究。空间矩方程显示出理论与模拟之间的良好匹配。我们根据大型和小型浮游植物的生态和物理特征对模型进行了参数化。我们将潜在的相互作用区域定义为营养耗竭量之间的重叠区域,结果表明,在可能的相互作用范围内,当地的物种组成取决于浮游植物的大小类别。在小型浮游植物中,个体大多保持在单一物种群中。因此,对于小型浮游植物来说,空间结构更有利于内部而非种间的相互作用,从而促进共存。大型浮游植物细胞邻域则显得更为混杂。虽然一些小规模的自组织空间结构仍然存在,并可能影响共存机制,但要解释大型浮游植物的多样性维持情况,可能还需要探索其他因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信