Beyond hydrography: daily ichthyoplankton variability and short term oceanographic events on the Sydney continental shelf
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Size and stage-dependent vertical migration patterns in reef-associated fish larvae off the eastern coast of Australia
2020, Deep-Sea Research Part I: Oceanographic Research PapersCitation Excerpt :This study focuses on investigating the ontogenetic vertical migration patterns of larval reef fish off the coast of New South Wales (NSW), Australia. While there have been many studies on the vertical distribution of larval assemblages off the NSW coast sampling across inshore and offshore communities (Dempster et al., 1997), different depths (Gray and Miskiewicz, 2000), and within different water masses (Keane and Neira, 2008), changes in the vertical distribution with respect to ontogeny are less studied. OVM has been investigated for some commercially valuable species off the coast of NSW (Smith, 2003), along with more general relationships between length and depth finding contrasting trends between species (Gray, 1993).
Historical daytime vertical structure of larval fish assemblages in southeast Australian coastal waters: A benchmark for examining regional ecosystem change
2019, Regional Studies in Marine ScienceCitation Excerpt :Using historical data, this study identifies and compares between seasons the vertical structure of the larval fish assemblages inhabiting inner continental shelf waters of southeastern Australia, a climate-change hot-spot with projected major changes in oceanography and marine ecosystem structure (Hobday and Lough, 2011). Historic and recent studies have distinguished that these temperate waters display marked seasonality in larval fish composition and oceanography (Gray and Miskiewicz, 2000; Suthers et al., 2011), with distinct larval assemblages associated with seasonal upwelling events, occurrences of particular water masses and eddies, and small- and meso-scale currents (Dempster et al., 1997; Smith et al., 1999; Smith and Suthers, 1999; Gray and Miskiewicz, 2000; Keane and Neira, 2008; Mullaney et al., 2011; Syahailatua et al., 2011; Mullaney and Suthers, 2013; Matis et al., 2014). Complimentary historical vertically stratified sampling has further identified compositional differences between larval fish assemblages in surface and subsurface (20–30 m depth) strata (Gray et al., 1992; Gray, 1993; Gray and Miskiewicz, 2000), but the structure of assemblages and the distributions of individual taxa over finer depth strata throughout the entire water column remain less documented.
Surface distribution of brachyuran megalopae and ichthyoplankton in the Columbia River plume during transition from downwelling to upwelling conditions
2013, Continental Shelf ResearchCitation Excerpt :Coastal distribution of late-stage larval crustaceans and juvenile fishes is a function of multiple factors. These include larval release time, duration of planktonic development, behaviorally mediated vertical position, and physical advective forces such as upwelling and plume dynamics (Dempster et al., 1997; Reiss and McConaugha, 1999; Shanks, 2009). Most of the species we observed had relatively long larval durations (>1 mo), spawned in winter during downwelling-dominant conditions, and recruited after the spring transition and initiation of upwelling (Shanks and Eckert, 2005; Shanks and Roegner, 2007; Shanks, 2009).
Characteristic ichthyoplankton taxa in the separation zone of the East Australian Current: Larval assemblages as tracers of coastal mixing
2011, Deep-Sea Research Part II: Topical Studies in OceanographyCitation Excerpt :The assemblages of ichthyoplankton reflect not only early life history strategies, but also could provide characteristic, short-term biological properties of different water masses. Local ichthyoplankton assemblages are dynamic, being advected at least at the scales of days and kilometres across the Sydney shelf (Dempster et al., 1997; Smith et al., 1999). Using detailed current velocity measurements to interpret the assemblage variability, these two studies concluded that larval assemblages functioned as a tracer (or property) of the water masses.
Occurrence of tropical fishes in temperate southeastern Australia: Role of the East Australian Current
2007, Estuarine, Coastal and Shelf ScienceCitation Excerpt :The extremely high richness and density of tropical fish observed at Nambucca and Southwest Rocks was not surprising given the proximity of these locations to the point at which the EAC curves rapidly to the east (around 31.5° to 32° S) and in so doing produces a large number of eddies (Bowen et al., 2005) which are capable of translocation entrained larval fish across the shelf (Hare et al., 2002). Larval fish distributions have been shown to respond quickly to cross-shelf advective processes (Dempster et al., 1997). The prediction that species found consistently further south would have longer PLDs was supported by our data.