ORCID Profile
0000-0002-4519-2769
Current Organisations
Port Stephens Fisheries Institute
,
China University of Geosciences (Beijing)
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Publisher: Wiley
Date: 12-11-2009
Publisher: Elsevier BV
Date: 05-2008
Publisher: Springer Netherlands
Date: 1997
Publisher: University of Chicago Press
Date: 03-2013
DOI: 10.1086/669146
Abstract: In resource-limited populations, an increase in average body size can occur only with a decline in abundance. This is known as self-thinning, and the decline in abundance in food-limited populations is considered proportional to the scaling of metabolism with body mass. This popular hypothesis may be inaccurate, because self-thinning populations can also experience density-dependent competition, which could alter their energy use beyond the predictions of metabolic scaling. This study tested whether density-dependent competition has an energetic role in self-thinning, by manipulating the abundance of the fish Macquaria novemaculeata and tank size to partition the effects of competition from metabolic scaling. We found that self-thinning can be density dependent and that changes in intraspecific competition may be more influential than metabolic scaling on self-thinning relationships. The energetic mechanism we propose is that density-dependent competition causes variation in the allocation of energy to growth, which alters the energetic efficiency of self-thinning cohorts. The implication is that food-limited cohorts and populations with competitive strategies that encourage fast-growing in iduals will have less body mass at equilibrium and higher mortality rates. This finding sheds light on the processes structuring populations and can be used to explain inconsistencies in the mass-abundance scaling of assemblages and communities (the energetic-equivalence rule).
Publisher: Wiley
Date: 25-02-2022
DOI: 10.1002/EDN3.185
Abstract: Environmental DNA (eDNA) has revolutionized our ability to identify the presence and distributions of terrestrial and aquatic organisms. Recent evidence suggests the concentration of eDNA could also provide a rapid, cost‐effective indicator of abundance and/or biomass for fisheries stock assessments. Globally, fisheries resources are under immense pressure, and their sustainable harvest requires accurate information on the sizes of fished stocks. However, in many cases the required information remains elusive because of a reliance on imprecise or costly fishery‐dependent and independent data. Here, we review the literature describing relationships between eDNA concentrations and fish abundance and/or biomass, as well as key influencing factors, as a precursor to determining the broader utility of eDNA for monitoring fish populations. We reviewed 63 studies published between 2012 and 2020 and found 90% identified positive relationships between eDNA concentrations and the abundance and/or biomass of focal species. Key influencing biotic factors included the taxon examined as well as their body size, distribution, reproduction, and migration. Key abiotic factors mostly comprised hydrological processes affecting the dispersal and persistence of eDNA, especially water flow and temperature, although eDNA collection methods were also influential. The cumulative influence of these different factors likely explains the substantial variability observed in eDNA concentrations, both within and among studies. Nevertheless, there is considerable evidence to support using eDNA as an ancillary tool for assessing fish population abundance and/or biomass across discrete spatio‐temporal scales, following preliminary investigations to determine species‐ and context‐specific factors influencing the eDNA abundance/biomass relationship. Advantages of eDNA monitoring relative to other approaches include reduced costs, increased efficiencies, and nonlethal s ling.
Publisher: Springer Science and Business Media LLC
Date: 10-2006
DOI: 10.1007/BF02786529
Publisher: Elsevier BV
Date: 09-2008
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 09-2001
Publisher: Hindawi Limited
Date: 11-03-2013
DOI: 10.1111/ARE.12158
Publisher: Elsevier BV
Date: 09-2000
Publisher: Wiley
Date: 31-03-2005
Publisher: Springer Science and Business Media LLC
Date: 10-08-2023
Publisher: MDPI AG
Date: 09-09-2016
Publisher: Inter-Research Science Center
Date: 20-12-2006
DOI: 10.3354/MEPS328237
Publisher: MDPI
Date: 08-06-2022
Publisher: Hindawi Limited
Date: 24-12-2012
DOI: 10.1111/ARE.12097
Publisher: Wiley
Date: 08-2005
Publisher: Public Library of Science (PLoS)
Date: 13-10-2014
Publisher: Springer Science and Business Media LLC
Date: 20-01-2013
Publisher: Elsevier BV
Date: 06-2006
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 08-2002
Publisher: Elsevier BV
Date: 12-2000
Publisher: Wiley
Date: 25-05-2007
Publisher: Elsevier BV
Date: 08-2006
Publisher: MDPI AG
Date: 08-03-2023
DOI: 10.3390/ENVIRONMENTS10030050
Abstract: Freshwater inflows are linked to the abundance and catch rates of fish in estuaries. The role of terrestrial carbon resources brought into estuaries after inflows may be important, but this is currently not well understood. Therefore, we performed a study examining the effect of terrestrial dissolved organic matter (tDOM) dietary additions on the growth of food-limited juvenile Australian bass (Macquaria novemculeata). Crustaceous zooplankton Artemia franciscana (Artemia) were reared for two days under control conditions (no addition) or with additions of tDOM leachate at dissolved organic carbon (DOC) concentrations of 5 mg/L or 10 mg/L. Artemia were fed to juvenile bass in their treatment tanks over 42 days at feeding rates reduced by 65–75% of ad libitum. Juvenile fish from the 5 mg/L treatment exhibited no statistical difference in weight or standard, fork and total lengths compared to the control treatment. In contrast, the fish in the 10 mg/L tDOM treatment had significant increases (p 0.05) in all length parameters after 42 days compared to the other treatments. The greater lengths of fish where tDOM is available indicate that tDOM can contribute to improved growth and development in juvenile Australian bass. While stable isotope analysis of fish tissue showed only minor changes toward terrestrial carbon signatures, increased terrestrial resource availability in the juvenile fish diets may have subsidised energetic needs, facilitating the greater utilisation of endogenous resources. Overall, the results indicate that freshwater inflows that deliver terrestrial resources may be important for the growth and development of estuarine fish.
Publisher: Elsevier BV
Date: 11-2007
Publisher: Elsevier
Date: 2013
Publisher: Hindawi Limited
Date: 07-2006
Publisher: Hindawi Limited
Date: 09-06-2010
Publisher: Wiley
Date: 22-05-2008
Publisher: Elsevier
Date: 2009
Publisher: MDPI AG
Date: 22-02-2023
DOI: 10.3390/D15030322
Abstract: Non-invasive, low-cost methods for censusing depleted fish populations are being prioritised among many jurisdictions worldwide. Collecting environmental DNA (eDNA) could offer one such option for augmenting fish population assessments. However, candidate species need to be carefully selected because species-specific DNA shedding and decay rates are affected by many biotic and abiotic factors that may influence relative abundance estimates. In this study, we sought to ascertain if the eDNA of a depleted Australian teleost, mulloway, Argyrosomus japonicus, reflects its weight under controlled aquaria conditions. With four experiments, we investigated the relationships between mulloway eDNA concentrations and their weight tank−1 as a function of: (1) time post-tank establishment (2) water temperatures (within the species’ tolerance range) (3) stocking densities and (4) among in idual, similar-sized fish. The concentrations of eDNA in tanks stabilised after six days, and a positive relationship was found between fish weight and eDNA concentration, despite some variability in shedding rates by similar-sized fish. There was also a positive effect of water temperature on eDNA concentrations, which reinforces the need to control for such abiotic factors. We conclude that there is strong utility in applying eDNA concentrations as an index of relative abundance for mulloway under controlled conditions, which justifies future field-based investigations.
Publisher: Elsevier BV
Date: 11-2005
Publisher: Wiley
Date: 09-1999
No related grants have been discovered for Donald Fielder.