Cross-front hydrography and fish larval distribution at the Angola–Benguela Frontal Zone

John, H.-Ch.; Mohrholz, Volker; Lütjeharms, J. R. E.

doi:10.1016/s0924-7963(00)00085-3

Cited by 24 publications

(26 citation statements)

References 13 publications

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“…Their vertical structuring was similar in the two periods, with a preference for the subsurface layers, as in other geographic areas with different hydrographic characteristics (Loeb, 1980;Moser and Smith, 1993;John et al, 2001;Isari et al, 2008) and similar to previous reports for the region (Olivar et al, 1998;Sabatés, 2004). Although their mean abundance was higher in early summer, in relative terms they represented only 14.4% of the total larvae in June compared with 40% in November.…”

Section: Fish Larvae Horizontal and Vertical Patternssupporting

confidence: 88%

The role of oceanographic conditions and plankton availability in larval fish assemblages off the Catalan coast (NW Mediterranean)

Olivar

Emelianov

Villate

et al. 2010

Fisheries Oceanography

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In the northwestern Mediterranean, most fish species reproduce in early summer and fewer in the autumn mixing period. This study analyses and compares larval fish assemblages (LFA) in both seasons, and is the first attempt to characterize LFA structure for the autumn period. We analyze horizontal and vertical distribution of fish larvae and the micro‐ and mesozooplankton biomass and abundance of the main zooplankton groups. The oceanographic situation was analyzed through the study of data from CTD, Nν‐Shuttle and ADCP surveys. LFA were determined by ordination analyses based on larval abundance, and the relationships between larval assemblages and environmental variables were investigated through canonical correspondence analysis. The importance of some hydrographic variables (temperature, salinity and stability of the water column), current fields (along‐shelf and across‐shelf transport) and the abundance of zooplankton are discussed as important factors shaping the structure of larval assemblages. In early summer, LFA were mainly structured by a combination of bathymetry and trophic components, although sea surface temperature also played a role in shaping the horizontal larval distributions. In autumn, trophic variables were the main factors influencing the shelf‐dwelling species assemblage. Larvae of oceanic species, on the other hand, were not related to trophic variables but were more affected by current fields.

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Section: Fish Larvae Horizontal and Vertical Patternssupporting

confidence: 88%

The role of oceanographic conditions and plankton availability in larval fish assemblages off the Catalan coast (NW Mediterranean)

Olivar

Emelianov

Villate

et al. 2010

Fisheries Oceanography

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“…Because vertical distribution of marine fish larvae is usually restricted to the upper 150−200 m of the water column (John et al 2001, Hare & Govoni 2005, Muhling & Beckley 2007, day and night differences in concentrations owing to vertical migration were not expected. Data for this study indicated that larval fishes were similarly abundant in day and night samples in shelf and offshore waters in the study region.…”

Section: Data Analysesmentioning

confidence: 99%

Larval fish assemblages and particle back-tracking define latitudinal and cross-shelf variability in an eastern Indian Ocean boundary current

Holliday¹,

Beckley²,

Millar³

et al. 2012

Mar. Ecol. Prog. Ser.

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Empirical and modelled data were used to examine the influence of the Leeuwin Current on larval fish assemblages along the Western Australian continental shelf and adjacent eastern Indian Ocean (22°S−34°S) during the late austral autumn. Larval fish assemblages, comprising > 200 taxa from 114 neritic and oceanic teleost families, displayed significantly distinct latitudinal and cross-shelf variability, which was linked to meso-scale features of the Leeuwin Current, specifically anticyclonic eddies. Results of Lagrangian particle back-tracking showed good connection between the shelf and a developing eddy situated at 27°S; connectivity was highest in the 0−20 m depth stratum where > 80% of the particles entering the eddy were derived from the shelf. This was supported by the high abundance (mean: 84 larvae m −2 ) of larval neritic taxa, especially small anchovy Engraulis australis larvae in the eddy. The lack of a significant difference in the size structure of these larvae between the shelf and eddy indicated continuous connection between these waters. In contrast, connectivity between the shelf and an older eddy further south was much lower (< 40% of particles in the 0−20 m stratum) and the larval fish assemblage was dominated by meso-pelagic species. Further, the distribution of Myctophidae larvae (Diaphus spp.) highlighted areas of enhanced onshore transport in the south. The study has shown that, in the alongshore dominated Leeuwin Current system, cross-shelf transport can be similarly important in dispersal processes.KEY WORDS: Leeuwin Current · Western Australia · Eddy · Lagrangian · Myctophidae · EngraulidaeResale or republication not permitted without written consent of the publisher

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“…In the past, the influence of physical processes on the distribution of larval fish assemblages has mainly been studied in various marine ecosystems, e.g., shelf‐slope density front and the associated currents (Hare et al. , 2001; John et al. , 2001), continental water inflow (Doyle et al.…”

Section: Introductionmentioning

confidence: 99%

“…The composition of larval fish assemblages varies spatially and temporally because of the behavior of larvae (Gray and Miskiewicz, 2000), as well as oceanographic transport and mixing processes (Auth, 2008;Muhling et al, 2008). In the past, the influence of physical processes on the distribution of larval fish assemblages has mainly been studied in various marine ecosystems, e.g., shelf-slope density front and the associated currents (Hare et al, 2001;John et al, 2001), continental water inflow (Doyle et al, 1993;Olivar et al, 2010), or stratification of the water column (Franco-Gordo et al, 2002), but only a few have focused on a marine environment in which circulation patterns are strongly influenced by monsoon systems Amjad, 2000, 2001;Hsieh et al, 2005;Lo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Larval fish assemblages in the Taiwan Strait, western North Pacific: linking with monsoon‐driven mesoscale current system

Hsieh

et al. 2012

Fisheries Oceanography

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This study, based on samples taken in seven cruises from February 2003 to November 2004, linked larval fish assemblages with mesoscale oceanographic features dominated by the monsoon‐driven current system in the Taiwan Strait. A total of 7753 specimens of larval fish were identified from our samples, belonging to 467 taxa in 112 families and 230 genera. Engraulidae, Myctophidae, Scombridae, Carangidae, and Gobiidae were the five most abundant families. Three larval fish assemblages were distinguished by association respectively with the China Coastal Current, Kuroshio Branch Current, and South China Sea Surface Current, and accordingly designated as the cold‐period northern Taiwan Strait (CNTS), southern Taiwan Strait (STS), and warm‐period northern Taiwan Strait (WNTS) assemblages. The composition of larval fish differed significantly between assemblages, with the CNTS being the most dissimilar assemblage, probably due to the presence of neritic/oceanic taxa in the STS and WNTS and primarily neritic‐associated taxa in the CNTS. The alternate intrusions of currents in the Taiwan Strait driven by seasonal monsoons play a pivotal role in the dispersal and community structure of larval fish. In addition, winter front turbulence and local topographic upwelling contributed to the increase in biological production; consequently resulting in high chlorophyll a concentrations and zooplankton biomass to provide abundant food for the survival of larval fish. The high correlation between the environmental variables and the larval fish assemblages offers the possibility to use the assemblages as indicators of the surface circulation in the Taiwan Strait and thereby improve our understanding of the ecosystems.

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Cross-front hydrography and fish larval distribution at the Angola–Benguela Frontal Zone

Cited by 24 publications

References 13 publications

The role of oceanographic conditions and plankton availability in larval fish assemblages off the Catalan coast (NW Mediterranean)

The role of oceanographic conditions and plankton availability in larval fish assemblages off the Catalan coast (NW Mediterranean)

Larval fish assemblages and particle back-tracking define latitudinal and cross-shelf variability in an eastern Indian Ocean boundary current

Larval fish assemblages in the Taiwan Strait, western North Pacific: linking with monsoon‐driven mesoscale current system

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