Alternation calling and spacing patterns in the field cricket Acanthogryllus fortipes (Orthoptera; Gryllidae)

1982 ◽  
Vol 60 (11) ◽  
pp. 2916-2920 ◽  
Author(s):  
William H. Cade ◽  
Daniel Otte
Keyword(s):  
South Africa ◽  
Field Cricket ◽  
Field Observations ◽  
Chirp Rate ◽  
Nearest Neighbour ◽  
Playback Experiments ◽  
Field Crickets ◽  
The Republic

Field observations and experiments in the Republic of South Africa demonstrated that burrowing male field crickets, Acanthogryllus fortipes, call in alternation by singing during the interval of silence in a neighbour's song. Alternating males had a chirp rate which was 30 to 60% that of nonaltrnating males. Rapidly singing and nonalternating males responded to taped playbacks of conspecific song by reducing their chirp rate to match that of a loudspeaker. Alternation calling is observed after sunset. Males do not alternate when they begin singing during the day. Nearest neighbour analyses of calling males and of cricket burrows show that calling males are spatially aggregated, but that burrows or potential signaling sites are not localized. In playback experiments where the loudspeaker to male distance was repeatedly reduced, males called at distances comparable to those separating actual males. Males became silent, however, when the loudspeaker was moved inside of the minimum intermale distance observed in the field. Spacing patterns are more compact in A. fortipes, a deep burrowing species, than in other gryllines, and A. fortipes is the only cricket species in which alternation of male calls has been demonstrated experimentally.

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

A Call for Public Participation in the Treaty-making Process in South Africa: What can South Africa Learn from the Kingdom of Thailand?

2020 ◽  
Vol 53 (1) ◽  
Author(s):  
Retselisitsoe Phooko
Keyword(s):  
South Africa ◽  
Human Rights ◽  
Public Participation ◽  
International Treaty ◽  
Legal Implications ◽  
Future Situation ◽  
Rules Of Procedure ◽  
The Republic ◽  
The Government ◽  
Personal Jurisdiction

On 2 August 2002 South Africa signed the Southern African Development Community (SADC) Protocol on Tribunal and the Rules of Procedure Thereof, thus effectively recognising and accepting the jurisdiction of the SADC Tribunal. Among the cases received by the SADC Tribunal was a complaint involving allegations of human rights violations by the government of Zimbabwe. It ruled that the government of Zimbabwe had violated human rights. Consequently, Zimbabwe mounted a politico-legal challenge against the existence of the Tribunal. This resulted in the review of the role and functions of the Tribunal in 2011 which resulted in the Tribunal being barred from receiving new cases or proceeding with the cases that were already before it. Furthermore, on 18 August 2014, the SADC Summit adopted and signed the 2014 Protocol on the Tribunal in the SADC which disturbingly limits personal jurisdiction by denying individual access to the envisaged Tribunal, thus reducing it to an inter-state judicial forum. This article critically looks at the decision of 18 August 2014, specifically the legal implications of the Republic of South Africa’s signing of the 2014 Protocol outside the permissible procedure contained in article 37 of the SADC Protocol on the Tribunal. It proposes that South Africa should correct this democratic deficit by introducing public participation in treaty-making processes in order to prevent a future situation where the executive unilaterally withdraws from an international treaty that is meant to protect human rights at a regional level. To achieve this, this article makes a comparative study between South Africa and the Kingdom of Thailand to learn of any best practices from the latter.

Drawing the Line between Dismissal for Alcoholism (Incapacity) and Dismissal for Drunkenness (Misconduct). Are the Boni Mores Compromised?

2018 ◽  
Vol 41 ◽  
pp. 57-63
Author(s):  
Thandekile Phulu
Keyword(s):  
South Africa ◽  
Economic Development ◽  
Social Justice ◽  
Occupational Health ◽  
Health And Safety ◽  
Occupational Health And Safety ◽  
Fundamental Rights ◽  
Labour Relations ◽  
Labour Practice ◽  
The Republic

In South Africa employees are protected by various pieces of legislation. Section 23 of the Constitution of the Republic of South Africa 1996 provides for a right to fair labour practice. In its preamble the Labour Relations Act 66 of 1995 (hereafter referred to as the LRA) states that the purpose of the Act is to advance economic development, social justice, labour peace and democratisation of the workplace. The LRA also states that one of its objectives is to give effect to and regulate the fundamental rights conferred by section 27 of the Constitution. The Occupational Health and Safety Act as amended by the Occupational Health and Safety Amendment Act 181 of 1993 provides for the health and safety of persons at work and for the health and safety of persons in connection with the use of plant and machinery. The LRA provides for dismissal for incapacity and dismissals for misconduct. It also differentiates between the two. The LRA provides for both substantive and procedural fairness when dismissing an employee for incapacity and misconduct. This paper will examine the rationale behind differentiating between dismissal for drunkenness and dismissal for alcoholism.

The Legal Status of Local Government in South Africa under the New Constitutional Dispensation

2018 ◽  
Vol 33 (2) ◽  
Author(s):  
Mbuzeni Mathenjwa
Keyword(s):  
South Africa ◽  
Local Government ◽  
Legal Status ◽  
Case Law ◽  
The Status ◽  
History Of ◽  
The Republic ◽  
First Time

The history of local government in South Africa dates back to a time during the formation of the Union of South Africa in 1910. With regard to the status of local government, the Union of South Africa Act placed local government under the jurisdiction of the provinces. The status of local government was not changed by the formation of the Republic of South Africa in 1961 because local government was placed under the further jurisdiction of the provinces. Local government was enshrined in the Constitution of the Republic of South Africa arguably for the first time in 1993. Under the interim Constitution local government was rendered autonomous and empowered to regulate its affairs. Local government was further enshrined in the final Constitution of 1996, which commenced on 4 February 1997. The Constitution refers to local government together with the national and provincial governments as spheres of government which are distinctive, interdependent and interrelated. This article discusses the autonomy of local government under the 1996 Constitution. This it does by analysing case law on the evolution of the status of local government. The discussion on the powers and functions of local government explains the scheme by which government powers are allocated, where the 1996 Constitution distributes powers to the different spheres of government. Finally, a conclusion is drawn on the legal status of local government within the new constitutional dispensation.

DEMOCRACY AT THE SERVICE OF FOREIGN POLICY OF THE REPUBLIC OF SOUTH AFRICA

2019 ◽  
Author(s):  
A. FREDDIE
Keyword(s):  
South Africa ◽  
Human Rights ◽  
Foreign Policy ◽  
Transition To Democracy ◽  
The Political ◽  
Political Activities ◽  
Foreign Policy Change ◽  
The Republic ◽  
Apartheid Regime

The article examines the place and role of democracy and human rights in South Africas foreign policy. The author analyzes the process of South Africas foreign policy change after the fall of the apartheid regime and transition to democracy. He gives characteristics of the foreign policy under different presidents of South Africa from 1994 to 2018 and analyzes the political activities of South Africa in the area of peacekeeping and human rights on the African continent.

scholarly journals Balancing Selection on Electrophoretic Variation of Phosphoglucose Isomerase in Two Species of Field Cricket: Gryllus veletis and G. pennsylvanicus

Genetics ◽  
1997 ◽  
Vol 147 (2) ◽  
pp. 609-621
Author(s):  
Laura A Katz ◽  
Richard G Harrison
Keyword(s):  
Balancing Selection ◽  
Emergent Property ◽  
Phosphoglucose Isomerase ◽  
Field Cricket ◽  
Nucleotide Variation ◽  
Eastern United States ◽  
Electrophoretic Variation ◽  
Sympatric Populations ◽  
Field Crickets ◽  
Gryllus Veletis

Two species of crickets, Gryllus veletis and G. pennsylvanicus, share six electrophoretic mobility classes for the enzyme phosphoglucose isomerase (PGI), despite evidence from other genetic markers that the two species are not closely related within eastern North American field crickets. Moreover, the frequencies of the two most common PGI electrophoretic classes (PGI-100 and PGI-65) covary in sympatric populations of these species in the eastern United States, suggesting that PGI may be subject to trans-specific balancing selection. To determine the molecular basis of the electrophoretic variation, we characterized the DNA sequence of the Pgi gene from 29 crickets (15 G. veletis and 14 G. pennsylvanicus). Amino acid substitutions that distinguish the electrophoretic classes are not the same in the two species, and there is no evidence that specific replacement substitutions represent trans-specific polymorphism. In particular, the amino acids that diagnose the PGI-65 allele relative to the PGI-100 allele differ both between G. veletis and G. pennsylvanicus and within G. pennsylvanicus. The heterogeneity among electrophoretic classes that covary in sympatric populations coupled with analysis of patterns of nucleotide variation suggest that Pgi is not evolving neutrally. Instead, the data are consistent with balancing selection operating on an emergent property of the PGI protein.

Safeguarding the Republic? The South African Police Service, Legitimacy and the Tribulations of Policing a Violent Democracy

2021 ◽  
Vol 56 (1) ◽  
pp. 92-108
Author(s):  
Guy Lamb
Keyword(s):  
South Africa ◽  
South African ◽  
Public Trust ◽  
The South ◽  
Police Service ◽  
South African Police Service ◽  
The Republic ◽  
South African Police ◽  
High Crime ◽  
Excessive Use Of Force

Since 1994 the South African Police Service (SAPS) has undertaken various efforts to build legitimacy in South Africa. Extensive community policing resources have been made available, and a hybrid community-oriented programme (sector policing) has been pursued. Nevertheless, public opinion data has shown that there are low levels of public trust in the police. Using Goldsmith’s framework of trust-diminishing police behaviours, this article suggests that indifference, a lack of professionalism, incompetence and corruption on the part of the police, particularly in high-crime areas, have eroded public trust in the SAPS. Furthermore, in an effort to maintain order, reduce crime and assert the authority of the state, the police have adopted militaristic strategies and practices, which have contributed to numerous cases of excessive use of force, which has consequently weakened police legitimacy in South Africa

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