Publication details.


Author(s):I. Alvarez, J. M. Rodriguez, I. A. Catalán, M. Hidalgo, D. Álvarez-Berastegui, R. Balbín, A. Aparicio-Gonzalez, F. Alemany
Title:Larval fish assemblage structure in the surface layer of the northwestern Mediterranean under contrasting oceanographic scenarios
JCR Impact Factor:2.15
Issue No.:4
During the summer, the relative influence of resident Atlantic Waters (AW) and new AW largely drives the mesoscale
dynamics around the Balearic Islands (NW Mediterranean). Two principal summer hydrographic scenarios were
identified in the region, differentiated by the relative position of the density front between new and resident AW within
the archipelago and its associated mesoscale activity. In this study, we investigated how those early summer mesoscale
scenarios influence larval fish assemblages, by analyzing data from two cruises representative of these two scenarios
(2004 and 2005). Redundancy analysis was used to assess the variance in the larval fish assemblage that could be sig-
nificantly explained by the most parsimonious combination of available environmental variables in both years. While
depth was the most important variable in explaining the larval fish assemblage structure variability observed under
both scenarios, indicators of mesoscale activity (dynamic height, geostrophic velocity) contributed significantly to
understanding the dynamics of the larval fish community. Mesoscale activity was higher in summer 2004, leading to
higher larval fish abundances and zooplankton biomass and lower larval fish diversity than in the unusually warm
summer 2005, which showed lower mesoscale activity. The larval assemblage dynamics are discussed in terms of ex-
trinsic and species-specific factors.

Related staff

  • Ignacio A. Catalán Alemany
  • Itziar Alvarez Ellacuria
  • Related departments

  • Field Ecology
  • Related research groups

  • Marine Ecosystems Dynamics