title: Impacts of hatchery-reared mandarin fish Siniperca chuatsi stocking on wild fish community and water quality in a shallow Yangtze lake

authors: Li, Wei

subjects: Science & Technology

abstract: Mandarin fish Siniperca chuatsi, a valuable piscivorous fish, have been stocked into many lakes in China since the 1990s. This study did the first attempt to evaluate the ecological effects of hatchery-reared mandarin fish stocking in the Yangtze River basin lakes. Our study demonstrated a significant change in fish community composition after mandarin fish stocking, but no fish extinction was observed. No significant difference was observed in the total density of 13 forage fish before and after mandarin fish stocking, but the total biomass showed a significant decline after mandarin fish stocking. Significant differences in length-frequency distributions were observed for Carassius auratus, Pseudorasbora parva and Toxabramis swinhonis captured before and after stocking mandarin fish. No significant change in habitat distribution was detected before and after mandarin fish stocking. A marked decline in total nitrogen and a slight decline in total phosphorus were observed while a slight increasing trend for Secchi depth was found after stocking. Our findings suggested that mandarin fish stocking can increase predation pressure on forage fish and subsequently optimize the food web structure. Also, mandarin fish stocking has the potential to improve water quality and may be a feasible strategy to alleviate eutrophication of shallow Yangtze lakes.

text: Impacts of hatchery-reared mandarin fish Siniperca chuatsi stocking on wild fish community and water quality in a shallow Yangtze lake Mandarin fish Siniperca chuatsi, a valuable piscivorous fish, have been stocked into many lakes in China since the 1990s. This study did the first attempt to evaluate the ecological effects of hatchery-reared mandarin fish stocking in the Yangtze River basin lakes. Our study demonstrated a significant change in fish community composition after mandarin fish stocking, but no fish extinction was observed. No significant difference was observed in the total density of 13 forage fish before and after mandarin fish stocking, but the total biomass showed a significant decline after mandarin fish stocking. Significant differences in length-frequency distributions were observed for Carassius auratus, Pseudorasbora parva and Toxabramis swinhonis captured before and after stocking mandarin fish. No significant change in habitat distribution was detected before and after mandarin fish stocking. A marked decline in total nitrogen and a slight decline in total phosphorus were observed while a slight increasing trend for Secchi depth was found after stocking. Our findings suggested that mandarin fish stocking can increase predation pressure on forage fish and subsequently optimize the food web structure. Also, mandarin fish stocking has the potential to improve water quality and may be a feasible strategy to alleviate eutrophication of shallow Yangtze lakes.

year: 2018

title: Constructing an 'efficient frontier' of accounting journal quality

authors: Lowe, Alan

subjects: efficient frontier

abstract: This paper reports the construction of an ‘efficient frontier’ of the perceived quality attributes of academic accounting journals. The analysis is based on perception data from two web-based surveys of Australasian and British academics.
The research reported here contributes to the existing literature by augmenting the commonly supported single dimension of quality with an additional measure indicating the variation of perceptions of journal quality. The result of combining these factors is depicted diagrammatically in a manner that reflects the risk and return trade-off as conceptualised in the capital market model of an efficient frontier of investment opportunities. This conceptualisation of a ‘market’ for accounting research provides a context in which to highlight the complex issues facing academics in their roles as editors, researchers and authors.
The analysis indicates that the perceptions of the so-called ‘elite’ US accounting journals have become unsettled particularly in Australasia, showing high levels of variability in perceived quality, while other traditionally highly ranked journals (ABR, AOS, CAR) have a more ‘efficient’ combination of high-quality ranking and lower dispersion of perceptions. The implications of these results for accounting academics in the context of what is often seen as a market for accounting research are discussed.

text: Constructing an 'efficient frontier' of accounting journal quality This paper reports the construction of an ‘efficient frontier’ of the perceived quality attributes of academic accounting journals. The analysis is based on perception data from two web-based surveys of Australasian and British academics.
The research reported here contributes to the existing literature by augmenting the commonly supported single dimension of quality with an additional measure indicating the variation of perceptions of journal quality. The result of combining these factors is depicted diagrammatically in a manner that reflects the risk and return trade-off as conceptualised in the capital market model of an efficient frontier of investment opportunities. This conceptualisation of a ‘market’ for accounting research provides a context in which to highlight the complex issues facing academics in their roles as editors, researchers and authors.
The analysis indicates that the perceptions of the so-called ‘elite’ US accounting journals have become unsettled particularly in Australasia, showing high levels of variability in perceived quality, while other traditionally highly ranked journals (ABR, AOS, CAR) have a more ‘efficient’ combination of high-quality ranking and lower dispersion of perceptions. The implications of these results for accounting academics in the context of what is often seen as a market for accounting research are discussed.

year: 2006

title: Legal, business and comparative issues in mining and petroleum activity with respect to Māori matters

authors: Barton, Barry

abstract: In this paper I propose to do three things: to identify the very different implications of the different stages of the mining and the oil and gas sequence, to discuss the basics of the Crown Minerals Act and associated legislation, with particular reference to Māori interests, and to touch on a few points of comparison with Canada.

text: Legal, business and comparative issues in mining and petroleum activity with respect to Māori matters In this paper I propose to do three things: to identify the very different implications of the different stages of the mining and the oil and gas sequence, to discuss the basics of the Crown Minerals Act and associated legislation, with particular reference to Māori interests, and to touch on a few points of comparison with Canada.

year: 2014