Pollination and reproduction enhance the invasive potential of an early invader: the case of Lythrum salicaria (purple loosetrife) in South Africa

2021 ◽  
Author(s):  
Sjirk Geerts ◽  
Opeyemi Adedoja
Keyword(s):  
South Africa ◽  
Lythrum Salicaria ◽  
Invasive Potential

scholarly journals Invasive potential and management of Melaleuca hypericifolia (Myrtaceae) in South Africa

2017 ◽  
Vol 108 ◽  
pp. 110-116 ◽  
Author(s):  
K.I. Hickley ◽  
H. Kaplan ◽  
E. Van Wyk ◽  
J.L. Renteria ◽  
J.S. Boatwright
Keyword(s):  
South Africa ◽  
Invasive Potential

Exploring the Origin and Genetic Diversity of the Giant Reed, Arundo donax in South Africa

2017 ◽  
Vol 10 (01) ◽  
pp. 53-60 ◽  
Author(s):  
Kim Canavan ◽  
Iain D. Paterson ◽  
Martin P. Hill
Keyword(s):  
South Africa ◽  
Genetic Diversity ◽  
Biological Control ◽  
Control Program ◽  
Arundo Donax ◽  
Giant Reed ◽  
Riparian Areas ◽  
Invasive Potential ◽  
Global Understanding ◽  
Negative Impacts

The giant reed,Arundo donaxis one of the worst invasive alien species globally, including South Africa, where it invades riparian areas across the country. Biological control is being considered to address the invasive potential and negative impacts of the weed. This study investigated the phylogeography ofA. donaxto guide the biological control program. To determine plant haplotype and genetic diversity, three regions of the chloroplast were sequenced and three microsatellite markers were analyzed in 40 samples from across the plant’s distribution in South Africa. It was determined that all populations ofA. donaxin South Africa were haplotype M1, which is the most widely distributed haplotype worldwide, believed to originate from the Indus Valley, Asia. In addition, no genetic diversity was found, indicating that all theA. donaxpopulations in South Africa are essentially one clone. The results indicate that suitable biological control agents are likely to be found in the ancient native range of haplotype M1. This research has contributed to the global understanding of the phylogeography ofA. donaxand will guide the biological control program in South Africa.

scholarly journals Seasonal Population Abundance of Bactrocera Dorsalis Hendel (Diptera: Tephritidae) in Selected Districts of Northern KwaZulu Natal, South Africa

2021 ◽  
Vol 2 (1) ◽  
pp. 79-84
Author(s):  
Simphiwe Mnguni
Keyword(s):  
South Africa ◽  
Abiotic Factors ◽  
Management Strategies ◽  
Bactrocera Dorsalis ◽  
Invasive Potential ◽  
Management Options ◽  
Kwazulu Natal ◽  
Important Pest ◽  
Trap Catches ◽  
Seasonal Population

The fruitfly Bactrocera dorsalis is an economically important pest that requires management for the sustainability of agriculture in South Africa. This pest has spread from the country's Northern parts within a decade, where it has completely established and spread to other neighbouring provinces. The pest spreads at various rates due to different factors given biotic and abiotic factors. Understanding factors that influence pest prevalence will assist with practical management strategies. Temperature is one of the factors that assist the invasive potential of B. dorsalis. KwaZulu Natal province is among the hotspot provinces in the country besides Limpopo and Mpumalanga. Trap catches in Northern KwaZulu Natal, uMkhanyakude and King Cetshwayo districts show that the seasonal populations of B. dorsalis are continuously present all year round, even with the application of management options to reduce pest populations. Host availability plays a significant role in the invasion and total outcompeting of other native fruitflies e.g. Ceratitis punctata.

scholarly journals Alnus glutinosa (Betulaceae) in South Africa: invasive potential and management options

2020 ◽  
Vol 135 ◽  
pp. 280-293
Author(s):  
Jan-Hendrik Keet ◽  
Mark P. Robertson ◽  
David M. Richardson
Keyword(s):  
South Africa ◽  
Alnus Glutinosa ◽  
Invasive Potential ◽  
Management Options

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.

Ultrastructural features of prognostic significance in human oral cancer

1992 ◽  
Vol 50 (1) ◽  
pp. 618-619
Author(s):  
Karvita B. Ahluwalia ◽  
Nidhi Sharma
Keyword(s):  
Oral Cancer ◽  
Squamous Cell ◽  
Common Knowledge ◽  
Prognostic Significance ◽  
Growth Control ◽  
Terminal Differentiation ◽  
Squamous Cell Carcinomas ◽  
Effective Therapy ◽  
Invasive Potential ◽  
Biological Behaviour

It is common knowledge that apparently similar tumors often show different responses to therapy. This experience has generated the idea that histologically similar tumors could have biologically distinct behaviour. The development of effective therapy therefore, has the explicit challenge of understanding biological behaviour of a tumor. The question is which parameters in a tumor could relate to its biological behaviour ? It is now recognised that the development of malignancy requires an alteration in the program of terminal differentiation in addition to aberrant growth control. In this study therefore, ultrastructural markers that relate to defective terminal differentiation and possibly invasive potential of cells have been identified in human oral leukoplakias, erythroleukoplakias and squamous cell carcinomas of the tongue.

Sign in / Sign up

Export Citation Format

Share Document