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Mannocci Laura, Roberts J. J., Pedersen E. J., Halpin P. N. (2020). Geographical differences in habitat relationships of cetaceans across an ocean basin. Ecography, [Early access], [10 p.]. ISSN 0906-7590

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-05/010079064.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.1111/ecog.04979

Titre
Geographical differences in habitat relationships of cetaceans across an ocean basin
Année de publication2020
Type de documentArticle référencé dans le Web of Science WOS:000531110000001
AuteursMannocci Laura, Roberts J. J., Pedersen E. J., Halpin P. N.
SourceEcography, 2020, [Early access], p. [10 p.]. p. [10 p.] ISSN 0906-7590
RésuméThe distributions of highly mobile marine species such as cetaceans are increasingly modeled at basin scale by combining data from multiple regions. However, these basin-wide models often overlook geographical variations in species habitat relationships between regions. We tested for geographical variations in habitat relationships for a suite of cetacean taxa between the two sides of the North Atlantic basin. Using cetacean visual survey data and remote sensing data from the western and eastern basin in summer, we related the probability of presence of twelve cetacean taxa from three guilds to seafloor depth, sea surface temperature and primary productivity. In a generalized additive model framework, we fitted 1) basin-wide (BW) models, assuming a single global relationship, 2) region-specific intercepts (RI) models, assuming relationships with the same shape in both regions, but allowing a region-specific intercept and 3) region-specific shape (RS) models, assuming relationships with different shapes between regions. RS models mostly yielded significantly better fits than BW models, indicating cetacean occurrences were better modeled with region-specific than with global relationships. The better fits of RS models over RI models further provided statistical evidence for differences in the shapes of region-specific relationships. Baleen whales showed striking differences in both the shapes of relationships and their mean presence probabilities between regions. Deep diving whales and delphinoids showed contrasting relationships between regions with few exceptions (e.g. non-statistically different shapes of region-specific relationships for harbor porpoise and beaked whales with depth). Our findings stress the need to account for geographical differences in habitat relationships between regions when modeling species distributions from combined data at the basin scale. Our proposed hypotheses offer a roadmap for understanding why habitat relationships may geographically vary in cetaceans and other highly mobile marine species.
Plan de classementEcologie, systèmes aquatiques [036] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.ATLANTIQUE NORD
LocalisationFonds IRD [F B010079064]
Identifiant IRDfdi:010079064
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010079064

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