There is a general lack of information related to the spatial structure and functioning of marine ecosystems considering seasonality. Here we modelled the biomass distribution of eight commercial marine species in the northwestern Mediterranean Sea during winter and summer. We hypothesised that the seasonal differences of the water column and the spatial heterogeneity of oceanographic conditions in the study area could result in seasonal variations on the species biomass distributions. We employed a Bayesian hierarchical species distribution modelling approach (B-SDM) with data from two experimental trawl surveys to analyse which are the significant drivers in each season. Our results showed that bathymetry, temperature and fishing patterns are important variables explaining the species spatial biomass distributions. Furthermore, we found seasonal differentiation in the spatial distribution of biomass for all the studied species. Our results provide essential knowledge about the seasonal distributions of key species in the Mediterranean Sea, with important management implications.

考虑到季节性，普遍缺乏与海洋生态系统的空间结构和功能有关的信息。在这里，我们模拟了冬季和夏季地中海西北部八个商业海洋物种的生物量分布。我们假设研究区域水柱的季节差异和海洋条件的空间异质性可能导致物种生物量分布的季节变化。我们使用贝叶斯分层物种分布建模方法（B-SDM），并从两次实验性拖网调查中获得数据，以分析每个季节的重要驱动因素。我们的结果表明，测深，温度和捕捞方式是解释物种空间生物量分布的重要变量。此外，我们发现所有研究物种的生物量空间分布都存在季节差异。我们的研究结果提供了有关地中海主要物种的季节性分布的基本知识，并具有重要的管理意义。