Murphy James T, Johnson Mark P, Viard Frédérique
Sorbonne Universités, UPMC Univ Paris 6, CNRS, UMR 7144, Department, Adaptation & Diversity in Marine Environment, Divco Team, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France; Marine Environment Research Group, Ryan Institute, National University of Ireland Galway, Galway, Ireland.
Marine Environment Research Group, Ryan Institute, National University of Ireland Galway, Galway, Ireland.
J Theor Biol. 2016 May 7;396:105-15. doi: 10.1016/j.jtbi.2016.01.038. Epub 2016 Feb 6.
A key factor to determine the expansion dynamics and future distribution of non-native species is their physiological response to abiotic factors and their changes over time. For this study we developed a spatially explicit, agent-based model of population growth to represent the complex population dynamics of invasive marine macroalgae with heteromorphic biphasic life cycles. The model framework represents this complex life cycle by treating the individual developmental stages (gametophytes/sporophytes) as autonomous agents with unique behaviour/growth parameters. It was parameterised to represent a well-documented invasive algal species, the Asian kelp Undaria pinnatifida, and validated against field results from an in situ population in Brittany, France, showing good quantitative agreement in terms of seasonal changes in abundance/recruitment and growth dynamics. It was then used to explore how local environmental parameters (light availability, temperature and day length) affect the population dynamics of the individual developmental stages and the overall population growth. This type of modelling approach represents a promising tool for understanding the population dynamics of macroalgae from the bottom-up in terms of the individual interactions between the independent life history stages (both microscopic and macroscopic). It can be used to trace back the behaviour of the population as a whole to the underlying physiological and environmental processes impacting each developmental stage and give insights into the roles these play in invasion success.
决定非本地物种扩张动态和未来分布的一个关键因素是它们对非生物因素的生理反应及其随时间的变化。在本研究中，我们开发了一个基于个体的空间明确模型来描述具有异形双相生命周期的入侵海洋大型藻类的复杂种群动态。该模型框架通过将个体发育阶段（配子体/孢子体）视为具有独特行为/生长参数的自主个体来描述这种复杂的生命周期。它被参数化以代表一种有充分文献记载的入侵藻类物种——亚洲海带裙带菜，并根据法国布列塔尼一个原地种群的实地结果进行了验证，在丰度/补充和生长动态的季节性变化方面显示出良好的定量一致性。然后，它被用来探索当地环境参数（光照可用性、温度和日长）如何影响个体发育阶段的种群动态和总体种群增长。这种建模方法是一种很有前景的工具，可从自下而上的角度，根据独立生活史阶段（微观和宏观）之间的个体相互作用来理解大型藻类的种群动态。它可用于将整个种群的行为追溯到影响每个发育阶段的潜在生理和环境过程，并深入了解这些过程在入侵成功中所起的作用。
