Effect of the Leeuwin Current on the Recruitment of Fish and Invertebrates along the Western Australian Coast

1996 ◽  
Vol 47 (2) ◽  
pp. 147 ◽  
Author(s):  
N Caputi ◽  
WJ Fletcher ◽  
A Pearce ◽  
CF Chubb
Keyword(s):  
Western Australia ◽  
Positive Impact ◽  
Larval Survival ◽  
Negative Influence ◽  
Positive Influence ◽  
Major Influence ◽  
Larval Phase ◽  
Leeuwin Current ◽  
Shark Bay ◽  
Western Australian

The relatively high catch of invertebrate species compared with finfish off Western Australia is in sharp contrast to other regions of the world, where finfish production usually dominates. This low level of finfish production is primarily due to the Leeuwin Current, which consists of warm, low-nutrient waters flowing south along the edge of the continental shelf of the Western Australian coast. In contrast, the other eastern boundary currents in the Southern Hemisphere (Humboldt and Benguela) are associated with upwelling of cool, nutrient-rich waters flowing north and the high rates of primary production resulting in a large finfish production. The Leeuwin Current, being the dominant oceanographic feature off Western Australia, has a major influence on the abundance of many species. The larval phase is the stage mainly affected by the current, but not always with the same result. For example, the strength of the Leeuwin Current has a significant positive influence during the larval stage of the western rock lobster (Panulirus cygnus). However, the current has a negative influence during the larval life of the scallop, Amusium balloti, in Shark Bay. Similarly for the pelagic finfish species, the current has a negative effect on larval survival of pilchards (Sardinops sagax neopilchardus) but a positive impact for whitebait (Hyperlophus vittatus). Possible mechanisms for the effect of the current include transportation of larvae and temperature effects on spawning success and on survival and growth of larvae.

Corrigendum to: Ocean currents and the larval phase of Australian western rock lobster, Panulirus cygnus

2002 ◽  
Vol 53 (3) ◽  
pp. 731 ◽  
Author(s):  
David A. Griffin ◽  
John L. Wilkin ◽  
Chris F. Chubb ◽  
Alan F. Pearce ◽  
Nick Caputi
Keyword(s):  
Transport Model ◽  
Early Stage ◽  
Larval Survival ◽  
Ocean Currents ◽  
Larval Transport ◽  
Offshore Wind ◽  
Larval Phase ◽  
Leeuwin Current ◽  
The North ◽  
Panulirus Cygnus

The return of Panulirus cygnus larvae to the coast of Western Australia after nearly a year at sea and its modulation by ocean currents were addressed with an individual-based larval-transport model. The simulations implied that offshore wind-driven transport of larvae is balanced by onshore geostrophic flow. Additional simulations revealed that vertical migration behaviour was essential to larval survival through its impact on advection. The six years simulated include two of high, two of low, and two of average puerulus settlement. The most robust interannual difference of the simulations was that, when coastal sea level was low and the Leeuwin Current was weak, more early-stage larvae were lost to the north and west under the influence of the wind. Conversely, many late-stage model larvae were carried south of the fishery in years when the Leeuwin Current was strong. The fraction of model larvae remaining or arriving offshore of the fishery and metamorphosing was essentially constant from year to year, so the variation in observed puerulus settlement was not explained by the model. The results imply that the nonadvective effects of fluctuations in the Leeuwin (e.g., on temperature and primary production) were primarily responsible for the high variation in natural settlement.

Ocean currents and the larval phase of Australian western rock lobster, Panulirus cygnus

2001 ◽  
Vol 52 (8) ◽  
pp. 1187 ◽  
Author(s):  
David A. Griffin ◽  
John L. Wilkin ◽  
Chris F. Chubb ◽  
Alan F. Pearce ◽  
Nick Caputi
Keyword(s):  
Transport Model ◽  
Early Stage ◽  
Larval Survival ◽  
Ocean Currents ◽  
Larval Transport ◽  
Offshore Wind ◽  
Larval Phase ◽  
Leeuwin Current ◽  
The North ◽  
Panulirus Cygnus

The return of Panulirus cygnus larvae to the coast of Western Australia after nearly a year at sea and its modulation by ocean currents were addressed with an individual-based larval-transport model. The simulations implied that offshore wind-driven transport of larvae is balanced by onshore geostrophic flow. Additional simulations revealed that vertical migration behaviour was essential to larval survival through its impact on advection. The six years simulated include two of high, two of low, and two of average puerulus settlement. The most robust interannual difference of the simulations was that, when coastal sea level was low and the Leeuwin Current was weak, more early-stage larvae were lost to the north and west under the influence of the wind. Conversely, many late-stage model larvae were carried south of the fishery in years when the Leeuwin Current was strong. The fraction of model larvae remaining or arriving offshore of the fishery and metamorphosing was essentially constant from year to year, so the variation in observed puerulus settlement was not explained by the model. The results imply that the nonadvective effects of fluctuations in the Leeuwin (e.g., on temperature and primary production) were primarily responsible for the high variation in natural settlement.

scholarly journals Reproductive biology of Rhabdosargus sarba (Sparidae) in Western Australian waters, in which it is a rudimentary hermaphrodite

2003 ◽  
Vol 83 (6) ◽  
pp. 1333-1346 ◽  
Author(s):  
S. Alex Hesp ◽  
Ian C. Potter
Keyword(s):  
Reproductive Biology ◽  
Western Australia ◽  
River Estuary ◽  
Marine Waters ◽  
Spawning Period ◽  
Shark Bay ◽  
Males And Females ◽  
First Maturity ◽  
Swan River ◽  
Western Australian

The reproductive biology of the tarwhine Rhabdosargus sarba has been studied in three very different environments in Western Australia, namely the lower reaches of the Swan River Estuary and marine waters at the same latitude, i.e. ≈32°S, and a large subtropical marine embayment (Shark Bay) approximately 800 km further north. A macroscopic and histological examination of the gonads demonstrated that R. sarba is typically a rudimentary hermaphrodite in Western Australian waters, i.e. the juveniles develop into either a male or female in which the ovarian and testicular zones of the gonads, respectively, are macroscopically undetectable. This contrasts with the situation in the waters off Hong Kong and South Africa where R. sarba is reported to be a protandrous hermaphrodite. Although R. sarba spawns between mid-late winter and late spring in each water body, the onset of spawning in the estuary is delayed until salinities have risen well above their winter minima. Although males and females attain sexual maturity at very similar lengths in the Swan River Estuary and Shark Bay, i.e. each L50 for first maturity lies between 170 and 177 mm total length (TL), they typically reach maturity at an earlier age in the former environment, i.e. 2 vs 3 years old. During the spawning period, only 25 and 12% of the males and females, respectively, that were caught between 180 and 260 mm TL in nearshore marine waters were mature, whereas 94 and 92% of the males and females, respectively, that were collected in this length-range over reefs, were mature. This indicates that R. sarba tends to move offshore when it has become ‘physiologically’ ready to mature. The L50s at first maturity indicate that the minimum legal length in Western Australia (230 mm TL) is appropriate for managing this species.

scholarly journals Condition of larvae of western rock lobster (Panulirus cygnus) in cyclonic and anticyclonic eddies of the Leeuwin Current off Western Australia

2015 ◽  
Vol 66 (12) ◽  
pp. 1158 ◽  
Author(s):  
Miao Wang ◽  
Richard O'Rorke ◽  
Anya M. Waite ◽  
Lynnath E. Beckley ◽  
Peter Thompson ◽  
...  
Keyword(s):  
Western Australia ◽  
Spiny Lobster ◽  
Dry Mass ◽  
Leeuwin Current ◽  
Dramatic Decline ◽  
Biochemical Analyses ◽  
Panulirus Cygnus ◽  
Anticyclonic Eddies ◽  
Western Australian ◽  
Stage Viii

Changes in the offshore oceanographic processes are suspected to be the cause of a recent dramatic decline in the settlement of post-larvae of the Western Australian spiny lobster (Panulirus cygnus), which has greatly reduced the productivity from the world’s second-largest spiny lobster fishery. The present study assessed whether there are differences in the nutritional condition of the larvae of P. cygnus sampled from two pairs of cyclonic eddies (CEs) and anticyclonic eddies (AEs). Morphometric and biochemical analyses were undertaken on the mid–late-stage larvae (VI, VII, VIII) sampled offshore from two pairs of adjacent counter-rotating mesoscale eddies in the Leeuwin Current off Western Australia. The results showed that larvae captured from CEs had greater average total dry mass (P<0.001) than those from AEs. Stage VIII larvae from CEs contained more protein (P<0.008) (38.5% ±5.4s.e.) and lipid (P<0.005) (67.2% ±12.1) than did those from AEs. The possible causes for these differences are uncertain but may be related to differences in water temperatures in CEs v. AEs influencing the ability of phyllosomas to accumulate nutritional reserves.

Determinants of firm’s propensity to patent its inventions

2019 ◽  
Vol 29 (4) ◽  
pp. 375-400 ◽  
Author(s):  
Deepak Chandrashekar ◽  
Bala Subrahmanya M.H.
Keyword(s):  
Positive Impact ◽  
Sampling Technique ◽  
Negative Influence ◽  
Positive Influence ◽  
Primary Data ◽  
High Tech ◽  
Binary Logistic Regression Analysis ◽  
Content Type ◽  
Cost Constraints ◽  
Significant Positive Influence

Purpose The purpose of this paper is to ascertain the factors that influence the decision of a firm in a cluster to patent its inventions. Design/methodology/approach This study adopts a stratified random sampling technique to choose 101 sample firms from the identified population of firms in a cluster. Further, it uses the primary data collection method to collect data from sample firms through semi-structured questionnaires and in-depth interviews with the top level management of the sample firms. Furthermore, it carries out binary logistic regression analysis to primarily examine the influence of capability and willingness factors of a firm on the propensity of a firm to patent its inventions. Findings The paper corroborates from the results of the binary logit model that invention capacity has a significant positive impact on a firm’s propensity to obtain patents. In addition, the absorptive capacity of a firm above a certain threshold is likely to have a significant positive influence on the decision of a firm to patent its inventions. On the one hand, between the two motivator factors conventional motivators and strategy related motivators, conventional motivator factor has a significant positive influence on a firm’s propensity to obtain patents. On the other hand, both the de-motivator factors (time, market and cost constraints and procedural issues) have a significant negative influence on a firm’s propensity to patent its inventions. Originality/value This paper makes a key contribution to the existing literature by empirically validating the influence of capability of a firm in terms of its invention and absorptive capacities, and willingness of a firm constituting motivator and de-motivator factors, on the decision of a firm to obtain patents, in the context of a firm in a high-tech manufacturing cluster in a developing economy.

scholarly journals THE INFLUENCE FROM FINANCIAL PERFORMANCE ON EARNING PER SHARE (EPS) WITH SOUNDNESS LEVEL OF BANKS AS INTERVENING VARIABLE AT BUKU IV BANKS CATEGORY IN INDONESIA

2020 ◽  
Vol 2 (1) ◽  
pp. 21-33
Author(s):  
Rosmery Thomas ◽  
Selamet Riyadi ◽  
Zaenal Abidin ◽  
Muhammad Iqbal
Keyword(s):  
Negative Impact ◽  
Positive Impact ◽  
Secondary Data ◽  
Negative Influence ◽  
Positive Influence ◽  
Panel Data Regression ◽  
Analysis Technique ◽  
Data Regression ◽  
Significant Negative Impact ◽  
Rating Method

The purpose of this research was to analyze those influence of financial ratios towards earnings per share with soundness level of banks as an intervening variable based on risk-based bank rating method at BUKU IV Banks in Indonesia for the period of 2015-2019. The six banks are PT Bank Mandiri Tbk, PT Bank Rakyat Indonesia Tbk, PT Bank Negara Indonesia Tbk, PT Bank Central Asia Tbk, PT Bank CIMB Niaga Tbk and PT Bank Danamon Indonesia Tbk. This research used secondary data with quantitative approach. Data analysis technique used panel data regression by purposive sampling. The results showed that NPL & GCG had significant negative influence on soundness level of banks and NPL had significant negative impact on EPS. GCG had significant positive influence against EPS, and ROA & CAR did not have significant positive impact towards soundness level of banks & EPS, while soundness level of banks were not found to have significant negative affect to EPS, and soundness level of banks did not mediate NPL, GCG, ROA and CAR in affecting EPS

scholarly journals Effect of Corruption on Foreign Direct Investment Inflows in Nigeria

2019 ◽  
Vol 29 (2) ◽  
pp. 54-66
Author(s):  
Cordelia Onyinyechi Omodero
Keyword(s):  
Foreign Direct Investment ◽  
Direct Investment ◽  
Least Squares Method ◽  
Positive Impact ◽  
Legal Framework ◽  
Ordinary Least Squares ◽  
Negative Influence ◽  
Positive Influence ◽  
Young Generation ◽  
Foreign Direct Investment Inflows

Abstract This study investigates the effect of corruption on foreign direct investment inflows in Nigeria, by using some control variables. The study covers a period from 1996 to 2017 and employs Ordinary Least Squares method to perform the multiple regression analysis with the aid of SPSS version 20. The findings indicate that corruption has a significant positive influence on FDI. Though the influence of inflation is significantly negative but exchange rate and Nigeria’s corruption ranking position have insignificant positive impact on FDI. The implication is that the poor legal framework and institutional qualities in Nigeria are helping corruption to thrive in all areas of Nigeria’s economy and might ruin the young generation if nothing is done urgently. The study finds support for helping hand theory of corruption and FDI and also establishes that inflation has a significant negative influence on FDI inflows in the country. Therefore, the study recommends establishment of strong institutional and legal system to curtail the prevailing situation in order to save the future of the country.

scholarly journals Prayer Determination toward Employees Performance

2017 ◽  
Vol 5 (5) ◽  
pp. 59 ◽  
Author(s):  
Chablullah Wibisono
Keyword(s):  
Structural Equation ◽  
Work Performance ◽  
Positive Impact ◽  
Employee Performance ◽  
Negative Influence ◽  
Positive Influence ◽  
Social Community ◽  
Positive Performance ◽  
Modelling Analysis ◽  
The Social

Prayer is a consequence for person who belief to God as their duty by performing in five times a day. Those are dawn Dzuhur, Ashar, Maghrib and sobs Prayer is the pillars of Muslim, “whoever does the direction, they has heighten their religion, whoever leave means has moved down theirs. Prayer will bring positive impact to performance of human if there is good process that followed and done constantly. According to Rais (1998:60) a good way in Prayer could give good charity to Muslims itself while if not, so the charity for them must be not well. Although more Muslim people come to mosque, it doesn’t show that in society they do not do disavowal. Like have been stated by Rais (1998: 60) the answer is “because the soul of Prayer didn’t life in its person”. They might do Prayer practically and routine but don’t draw it in their daily life.Allah SWT asks Muslims to give to the poor and sick of human living in this world. It is called as zakat. like in this quote “….give zakat and give loan to Allah a goodly loan, and whatever good you send before you yourself” (Q.S.Al Muzammil: 20). This letter is not without meaning, the writer thought that there is a significant relationship in causality between prayer and zakat. Based on this theory someone who do Prayer frequently will give maximum in doing Zakat. Here, the writer can say that this Muslim categorize as success person economically. Isn’t the fac t? . In empirical way the writer can see that the social community whose actively do Prayer cannot be portrayed the same, it means that not all of them represent the positive performance. Hence, the writer interested to this topic about does prayer bring positive influence toward employee performance or conversely?The results of structural equation modelling analysis show that Prayer is directly influence on work performance with negative value. It can be indicated by a coefficient -1.35 with the probability for 0.00. it can be inferred that there is negative influence when the motivation to do Prayer are high the performance will be low. This effect isn’t relevant with the theory which stated the number of praying, Prayer and Fasting can be as much higher motivation toward the quality of performance. Those potentiality is divine asset that should be managed well in establishing the charity (Tasmara, 1995: 77). God. Give his blessing to all human with those potentialities in order to make consciousness about how pray can bring big influence to the performance. Hopefully, this article are functioned as well as finding the heighten of employee performance with Prayer suitable with Muslim studies as whole.

scholarly journals MODERN MANAGEMENT MODEL IN UKRAINE AND ITS INFLUENCE ON THE MECHANISM OF PERSONNEL MANAGEMENT OF THE TOURIST ENTERPRISE

2020 ◽  
pp. 83-88
Author(s):  
Nataliia Fedynets
Keyword(s):  
Personnel Management ◽  
Negative Impact ◽  
Positive Impact ◽  
Negative Influence ◽  
Positive Influence ◽  
Management Model ◽  
Modern Management ◽  
Model Of Management ◽  
National Model ◽  
Tourism Enterprises

Purpose. The aim of the article is to research features of national model of management and its influence on the mechanism of management of the personnel of the enterprises of tourism. Methodology of research. General scientific methods are used in the process of research, namely: methods of theoretical generalization – to study the features of the national model of management; systematic approach – to substantiate the negative impact of the existing management model on the mechanism of personnel management of the tourist enterprise; methods of analysis and synthesis – to determine the set of criteria for the formation of a modern management model in Ukraine and its importance for improving the efficiency of personnel management of tourism enterprises. Findings. The peculiarities of the national management model are studied. The mechanism of personnel management of a tourist enterprise is analysed taking into account the existing management model in Ukraine. The negative influence of the existing management model on the management processes in the tourist enterprise is established. A set of criteria for the formation of a modern management model in Ukraine has been identified. Originality. Scientific and theoretical bases of formation of modern model of management in Ukraine from the point of view of possible positive influence on administrative processes at the enterprises, including on process of management of the personnel of the tourist enterprise are developed. Practical value. The obtained results of the study are aimed at solving the problem of forming an effective modern management model in Ukraine, ensuring its positive impact on the management of domestic enterprises and can be used in practice to improve the mechanism of personnel management of tourism enterprises taking into account modern management trends. Key words: management model, modern management model, modern management, personnel, personnel management.

The Impact of Infants in Prison on Institutional Life: A Study of the Mother/Infant Prison Programme in Western Australia

1983 ◽  
Vol 16 (3) ◽  
pp. 172-188 ◽  
Author(s):  
Janette Hartz-Karp
Keyword(s):  
Western Australia ◽  
Positive Impact ◽  
Prison System ◽  
Western World ◽  
Total Institution ◽  
Family Ties ◽  
Prison Life ◽  
Prison Systems ◽  
The Impact ◽  
Western Australian

The Western Australian prison system, following trends of other prison systems in the western world, has embarked upon a limited programme of accommodating infants with their prisoner mothers during the mother's term of imprisonment. This research canvasses other mother/infant programmes noted in the literature, pointing to the special nature of the Western Australian situation. The focus of the study is on the impact of infants in prison on institutional life and the management problems so engendered. The data indicate that overall, infants have a positive impact on prison life, muting some of the more debilitating effects of institutionalization. The finding that the impact of the mother/infant prison programme is more peripheral to institutional life than expected is explained in the light of the obduracy of the "total institution". The major concerns expressed by those interviewed: prison staff, prisoner mothers and other prisoners, are, respectively: prisoner management, mother/infant prison facilities and family ties, and concerns of justice. With these issues in mind, problems of the current programme are discussed together with suggested resolutions.

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