Estuarine Ichthyoplankton Ecology in Relation to Hydrology and Zooplankton Dynamics in salt-wedge Estuary

Newton, Gina

doi:10.1071/mf9960099

Cited by 55 publications

(68 citation statements)

References 30 publications

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“…Newton 1996), the buoyancy of eggs and early stages (e.g. Mackenzie et al 2007), shifts in the amount and location of suitable spawning grounds (Nicholson et al 2008) and the movement patterns of fish (e.g.…”

Section: Freshwater Flow Estuarine Fishesmentioning

confidence: 99%

Detecting range shifts among Australian fishes in response to climate change

Booth

Bond

Macreadie

2011

Mar. Freshwater Res.

143

136

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Abstract. One of the most obvious and expected impacts of climate change is a shift in the distributional range of organisms, which could have considerable ecological and economic consequences. Australian waters are hotspots for climate-induced environmental changes; here, we review these potential changes and their apparent and potential implications for freshwater, estuarine and marine fish. Our meta-analysis detected ,300 papers globally on 'fish' and 'range shifts', with ,7% being from Australia. Of the Australian papers, only one study exhibited definitive evidence of climate-induced range shifts, with most studies focussing instead on future predictions. There was little consensus in the literature regarding the definition of 'range', largely because of populations having distributions that fluctuate regularly. For example, many marine populations have broad dispersal of offspring (causing vagrancy). Similarly, in freshwater and estuarine systems, regular environmental changes (e.g. seasonal, ENSO cycles -not related to climate change) cause expansion and contraction of populations, which confounds efforts to detect range 'shifts'. We found that increases in water temperature, reduced freshwater flows and changes in ocean currents are likely to be the key drivers of climateinduced range shifts in Australian fishes. Although large-scale frequent and rigorous direct surveys of fishes across their entire distributional ranges, especially at range edges, will be essential to detect range shifts of fishes in response to climate change, we suggest careful co-opting of fisheries, museum and other regional databases as a potential, but imperfect alternative.

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Section: Freshwater Flow Estuarine Fishesmentioning

confidence: 99%

Detecting range shifts among Australian fishes in response to climate change

Booth

Bond

Macreadie

2011

Mar. Freshwater Res.

143

136

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“…Black bream spawn from late winter to early summer in southern Australia, predominantly in salinities >10 (Newton 1996, Haddy & Pankhurst 1998, Walker & Neira 2001, Nicholson et al 2008. Laboratory studies have shown that egg survival and hatching is greatest in waters with salinities >10 (Haddy & Pankhurst 2000), and larvae in the laboratory have shown high levels of deformity at salinities <15 (Haddy & Pankhurst 2000).…”

Section: Introductionmentioning

confidence: 99%

Highly variable recruitment in an estuarine fish is determined by salinity stratification and freshwater flow: implications of a changing climate

Jenkins¹,

Conron²,

Morison³

2010

Mar. Ecol. Prog. Ser.

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Estuarine-dependent fish live in a complex and dynamic environment that is primarily influenced by the salinity structure resulting from the mixing of fresh and marine waters. In response to this variable environment, the recruitment of estuarine-dependent fish can also be highly variable. Recruitment variability in black bream Acanthopagrus butcheri in Gippsland Lakes, southeastern Australia, was determined both from annual recruitment monitoring and the age structure of the population. Recruitment was found to be episodic, with the population dominated by a few year classes. For the 2 methods of estimating recruitment and associated time periods, we found a consistent linear relationship between water column stratification (difference between surface and bottom salinity) and recruitment. There was also a significant, non-linear (dome-shaped) relationship between freshwater flow and recruitment. This relationship suggested that the highest recruitment occurred at intermediate flows greater than ~3000 Ml d -1 in the main tributary rivers. The combination of stratification and freshwater flow in a multiple regression model improved the variability in recruitment explained to 71 and 79%, respectively, for the 2 methods. Analysis of age structure of bream from other Victorian estuaries showed that, as in Gippsland Lakes, recruitment was highly variable and episodic; however, the timing of strong and weak year classes varied between estuaries. This suggests that freshwater flow and salinity structure, and consequent recruitment variability, are unique to each estuary based on characteristics of catchment, channel topography, and entrance opening and closing. Climate change predictions for the Gippsland Lakes region include less rainfall and higher evaporation, potentially leading to higher salinities and lower stratification in Gippsland Lakes. The bream population is therefore likely to be negatively affected, and these effects may be exacerbated by any human activities in the catchment that further reduce freshwater flows or increase marine incursion.

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“…Similar suggestions have been made for sparids. For instance, for both Acanthopagrus butcheri (Newton 1996) and Calamus proridens (Dubovitsky 1977) spawning cues on cold water temperatures leading to larval production at the period of maximum plankton abundance. While it may be the case that the timing of spawning does lead to a match between larval production and plankton productivity, this seems likely to be incidental or of secondary importance in warm water sparids.…”

Section: Discussionmentioning

confidence: 99%

Is the timing of spawning in sparid fishes a response to sea temperature regimes?

Sheaves

2006

Coral Reefs

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Published spawning seasons of sparid Wsh were investigated to determine if there were consistent patterns that could be related to large-scale physical variability, and whether these relationships were species-speciWc or characteristic of higher taxonomic groupings. For individual species, genera and the family Sparidae as a whole, there was a consistent pattern; spawning at lower latitudes was concentrated close to the month of lowest sea surface temperature, while spawning at higher latitudes was more variable with greater deviations from the month of minimum sea surface temperature. The distribution of sparids may be limited by a lack of tolerance of one or more early lifehistory stage to high water temperatures, so targeting spawning to the coolest part of the year could be a tactic allowing maximum penetration into warmer waters. Such a link between the physiology of early life-history stages and timing of spawning could have direct consequences for patterns of distributions over a number of taxonomic scales. If there are similar constraints on the reproduction of other species, even minor increases in water temperature due to global warming that may be within the tolerance of adults, may impose constraints on the timing of spawning, with Xow-on eVects for both species and whole ecosystems.

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Estuarine Ichthyoplankton Ecology in Relation to Hydrology and Zooplankton Dynamics in salt-wedge Estuary

Cited by 55 publications

References 30 publications

Detecting range shifts among Australian fishes in response to climate change

Detecting range shifts among Australian fishes in response to climate change

Highly variable recruitment in an estuarine fish is determined by salinity stratification and freshwater flow: implications of a changing climate

Is the timing of spawning in sparid fishes a response to sea temperature regimes?

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