Centro de Estudos Do Mar - Universidade Federal Do Paraná - Caixa Postal 50.002, 83255-000, Pontal Do Paraná, PR, Brazil; Universidade Federal de São Paulo, Av. Dona Ana Costa, 95 - CEP, 11060-001, Santos, SP, Brazil.
Universidade Federal de São Paulo, Av. Dona Ana Costa, 95 - CEP, 11060-001, Santos, SP, Brazil.
Mar Environ Res. 2021 Jan;163:105223. doi: 10.1016/j.marenvres.2020.105223. Epub 2020 Dec 1.
We tested the hypothesis that the ubiquity of marine meiofaunal nematodes and their indiscriminate passive dispersal create assemblages that are less limited by its environment; whereas the relatively smaller population sizes of macrofauna, associated with their ability to track environmental conditions before settlement, renders their distribution more environmentally-restricted. We compared the empirical distribution of macrofauna and nematode species with that of communities simulated under different assumptions of selection (e.g. environmental filtering) and non-selection (e.g. dispersal limitation) processes. Selection processes were the prime driver of both meio- and macrofauna assemblages, with rare species strongly contributing to this component. The total number of species explained by non-selection processes was 27% higher in nematodes than in macrofauna. Our results underline the importance of a species-level approach to determine the contribution of selection and non-selection assembly processes. Moreover, they highlight the important yet overlooked role of dispersal and stochastic processes in determining species dynamics.
我们检验了这样一个假设，即海洋小型后生动物线虫的普遍存在及其无差别被动扩散会形成不受环境限制的生物组合；而大型动物的种群规模相对较小，它们在定居前能够追踪环境条件，这使得它们的分布受到更多的环境限制。我们将大型动物和线虫物种的实际分布与不同选择（例如环境过滤）和非选择（例如扩散限制）假设下模拟的群落分布进行了比较。选择过程是后生动物和大型动物组合的主要驱动因素，稀有物种对此成分的贡献很大。非选择过程解释的物种总数在线虫中比在大型动物中高 27%。我们的研究结果强调了采用物种水平方法来确定选择和非选择组装过程的贡献的重要性。此外，它们还突出了扩散和随机过程在确定物种动态方面的重要而又被忽视的作用。
