Portfolio of distribution maps for Octopus vulgaris off Mauritania. - MARine Biodiversity, Exploitation and Conservation Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2023

Portfolio of distribution maps for Octopus vulgaris off Mauritania.

Résumé

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.
Fichier principal
Vignette du fichier
Portfolio of distribution maps for Octopus off Mauritania_30_03_23.pdf (1.47 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03649730 , version 1 (22-04-2022)
hal-03649730 , version 2 (10-04-2023)

Identifiants

Citer

Dedah Ahmed-Babou, Hervé Demarcq, Beyah Meissa, Nicolas Bez. Portfolio of distribution maps for Octopus vulgaris off Mauritania.. 2023. ⟨hal-03649730v2⟩
109 Consultations
72 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More