Ahmed-Babou D. auteur aut IRD Demarcq Hervé auteur aut IRD Meissa B. auteur aut IRD Bez Nicolas auteur aut IRD text journalArticle eng text/pdf reformatted digital access This study introduces the concept of portfolios of distribution maps, which consist of the reduced set of empirical orthogonal maps that best explain spatial biomass distributions of a given species over time. The approach is demonstrated for the distributions of common octopus (Octupus vulgaris) off Mauritania over the last thirty years. The maps in the portfolio are the subset of empirical orthogonal maps that allowed to recover 60% of the spatiotemporal biomass distribution variance and whose temporal weights were significantly correlated with abundance. For octopus during the hot season, one single map explained half of the overall variance of the distribution data, while during the cold season, the portfolio of octopus distribution maps consisted of four maps, with the temporal weights of the second map being negatively correlated with upwelling intensity six months before. The size of each portfolio represents the number of distinct spatial patterns describing octopus spatial distributions. Assuming that specific but hidden processes explain each biomass spatial distribution of the portfolio, the size of a map portfolio might be interpreted as a proxy for system resilience. A small portfolio could reflect systems that are more fragile. specialized Spatiotemporal distribution data Maps portfolio temporal dynamics Octopus vulgaris MAURITANIE ATLANTIQUE 034 040 36 15 [14 ] 2023 0990-7440 https://www.documentation.ird.fr/hor/fdi:010087716 10.1051/alr/2023008 0990-7440 [F B010087716] https://www.documentation.ird.fr/hor/fdi:010087716 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2023-06/010087716.pdf IRD - Base Horizon / Pleins textes 2023-06-30 2025-02-24 fdi:010087716 fre