Global-Scale Environmental Niche and Habitat of Blue Shark (Prionace glauca) by Size and Sex: A Pivotal Step to Improving Stock Management - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Frontiers in Marine Science Année : 2022

Global-Scale Environmental Niche and Habitat of Blue Shark (Prionace glauca) by Size and Sex: A Pivotal Step to Improving Stock Management

Steven Campana
  • Fonction : Auteur
Fábio H. V. Hazin
  • Fonction : Auteur
Heather Bowlby
  • Fonction : Auteur
Rui Coelho
  • Fonction : Auteur
Nuno Queiroz
  • Fonction : Auteur
Fabrizio Serena
  • Fonction : Auteur
Francisco Abascal
  • Fonction : Auteur
Dimitrios Damalas
Michael Musyl
  • Fonction : Auteur
Jon Lopez
  • Fonction : Auteur
Heidi Dewar
  • Fonction : Auteur
Brittany Finucci
  • Fonction : Auteur
Antonella Zanzi
  • Fonction : Auteur
Fulvio Garibaldi
  • Fonction : Auteur
David W. Sims
  • Fonction : Auteur
Joan Navarro
  • Fonction : Auteur
Pablo Cermeño
  • Fonction : Auteur
Agostino Leone
  • Fonction : Auteur
Guzmán Diez
  • Fonction : Auteur
María Teresa Carreón Zapiain
  • Fonction : Auteur
Michele Deflorio
  • Fonction : Auteur
Evgeny V. Romanov
  • Fonction : Auteur
Armelle Jung
  • Fonction : Auteur
Matthieu Lapinski
  • Fonction : Auteur
Malcolm P. Francis
  • Fonction : Auteur
Humberto Hazin
  • Fonction : Auteur

Résumé

Blue shark (Prionace glauca) is amongst the most abundant shark species in international trade, however this highly migratory species has little effective management and the need for spatio-temporal strategies increases, possibly involving the most vulnerable stage or sex classes. We combined 265,595 blue shark observations (capture or satellite tag) with environmental data to present the first global-scale analysis of species’ habitat preferences for five size and sex classes (small juveniles, large juvenile males and females, adult males and females). We leveraged the understanding of blue shark biotic environmental associations to develop two indicators of foraging location: productivity fronts in mesotrophic areas and mesopelagic micronekton in oligotrophic environments. Temperature (at surface and mixed layer depth plus 100 m) and sea surface height anomaly were used to exclude unsuitable abiotic environments. To capture the horizontal and vertical extent of thermal habitat for the blue shark, we defined the temperature niche relative to both sea surface temperature (SST) and the temperature 100 m below the mixed layer depth (Tmld+100). We show that the lifetime foraging niche incorporates highly diverse biotic and abiotic conditions: the blue shark tends to shift from mesotrophic and temperate surface waters during juvenile stages to more oligotrophic and warm surface waters for adults. However, low productivity limits all classes of blue shark habitat in the tropical western North Atlantic, and both low productivity and warm temperatures limit habitat in most of the equatorial Indian Ocean (except for the adult males) and tropical eastern Pacific. Large females tend to have greater habitat overlap with small juveniles than large males, more defined by temperature than productivity preferences. In particular, large juvenile females tend to extend their range into higher latitudes than large males, likely due to greater tolerance to relatively cold waters. Large juvenile and adult females also seem to avoid areas with intermediate SST (~21.7-24.0°C), resulting in separation from large males mostly in the tropical and temperate latitudes in the cold and warm seasons, respectively. The habitat requirements of sensitive size- and sex-specific stages to blue shark population dynamics are essential in management to improve conservation of this near-threatened species.
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hal-03669626 , version 1 (03-06-2022)

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Jean-Noël Druon, Steven Campana, Frederic Vandeperre, Fábio H. V. Hazin, Heather Bowlby, et al.. Global-Scale Environmental Niche and Habitat of Blue Shark (Prionace glauca) by Size and Sex: A Pivotal Step to Improving Stock Management. Frontiers in Marine Science, 2022, 9, ⟨10.3389/fmars.2022.828412⟩. ⟨hal-03669626⟩
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