Browsing Research Articles (Botany and Zoology) by Title
Now showing items 167-186 of 336
-
The implication of chemotypic variation on the anti-oxidant and anti-cancer activities of sutherlandia frutescens (L.) R.Br. (Fabaceae) from different geographic locations
(MDPI, 2020)Extracts of Sutherlandia frutescens (cancer bush) exhibit considerable qualitative and quantitative chemical variability depending on their natural wild origins. The purpose of this study was thus to determine bioactivity ... -
Implications of summer breeding frogs from Langebaanweg, South Africa : regional climate evolution at 5.1 mya
(Academy of Science of South Africa, 2016-09-28)No direct palaeoclimatic proxies have been available to indicate the seasonality or amount of rainfall on the west coast of southern Africa during the Early Pliocene. The Benguela Upwelling System (BUS) is today one of ... -
Implications of summer breeding frogs from Langebaanweg, South Africa : regional climate evolution at 5.1 mya
(Academy of Science of South Africa, 2016-05)No direct palaeoclimatic proxies have been available to indicate the seasonality or amount of rainfall on the west coast of southern Africa during the Early Pliocene. The Benguela Upwelling System (BUS) is today one of the ... -
Increasing functional modularity with residence time in the co-distribution of native and introduced vascular plants
(Nature Publishing Group, 2013-09)Species gain membership of regional assemblages by passing through multiple ecological and environmental filters. To capture the potential trajectory of structural changes in regional meta-communities driven by biological ... -
Indirect effects of habitat disturbance on invasion : nutritious litter from a grazing resistant plant favors alien over native Collembola
(John Wiley & Sons Ltd., 2015)Biological invasions are major threats to biodiversity, with impacts that may be compounded by other forms of environmental change. Observations of high density of the invasive springtail (Collembola), Hypogastrura manubrialis ... -
Influence of incubation management on pipping position, hatching ability and survival of ostrich chicks
(South African Society for Animal Science, 2011) -
The influence of interspecific competition and host preference on the phylogeography of two African ixodid tick species
(Public Library of Science -- PLoS, 2013-10)A comparative phylogeographic study on two economically important African tick species, Amblyomma hebraeum and Hyalomma rufipes was performed to test the influence of host specificity and host movement on dispersion. Pairwise ... -
The influence of pleistocene climatic changes and ocean currents on the phylogeography of the Southern African Barnacle, Tetraclita serrata (Thoracica; Cirripedia)
(Public Library of Science, 2014-07)Abstract The evolutionary effects of glacial periods are poorly understood for Southern Hemisphere marine intertidal species, particularly obligatory sessile organisms. We examined this by assessing the phylogeographic ... -
Die inkorporering van biomerkers in die assessering van die ekologiese risiko van chemiese bodemkontaminante
(AOSIS Publishing, 2007)Soil is an important but complex natural resource which is increasingly used as sink for chemicals. The monitoring of soil quality and the assessment of risks posed by contaminants have become crucial. This study deals ... -
Insights into invasion and restoration ecology : time to collaborate towards a holistic approach to tackle biological invasions
(Pensoft, 2012-02-15)The aim of our study is to provide an integrated framework for the management of alien plant invasions, combining insights and experiences from the fields of invasion and restoration ecology to enable more effective ... -
Insights on the persistence of pines (Pinus species) in the Late Cretaceous and their increasing dominance in the Anthropocene
(Wiley Open Access, 2018)ENGLISH ABSTRACT: Although gymnosperms were nearly swept away by the rise of the angiosperms in the Late Cretaceous, conifers, and pines (Pinus species) in particular, survived and regained their dominance in some habitats. ... -
An integrated, spatio-temporal modelling framework for analysing biological invasions
(Wiley, 2018)Aim: We develop a novel modelling framework for analysing the spatio-temporal spread of biological invasions. The framework integrates different invasion drivers and disentangles their roles in determining observed ... -
Integrative invasion science : model systems, multi-site studies, focused meta-analysis and invasion syndromes
(Wiley Online Library, 2013)Invasion science is a very active subdiscipline of ecology. However, some scientists contend that theoretical integration has been limited and that predictive power remains weak. This paper, focusing on plants, proposes ... -
Inter-island dispersal of flightless Bothrometopus huntleyi (Coleoptera: Curculionidae) from the sub-Antarctic Prince Edward Island archipelago
(Cambridge University Press, 2011)Bothrometopus huntleyi is a flightless weevil endemic to the volcanically-formed sub-Antarctic Prince Edward Islands archipelago that arose approximately 0.5 million years ago (m.y.a.). Since emergence, a series of volcanic ... -
Interactions among predators and plant specificity protect herbivores from top predators
(Ecological Society of America, 2018)The worldwide loss of top predators from natural and agricultural systems has heightened the need to understand how important they are in controlling herbivore abundance. The effect of top predators on herbivore species ... -
Intraspecific body size frequency distributions of insects
(Public Library of Science -- PLoS, 2011-03)Although interspecific body size frequency distributions are well documented for many taxa, including the insects, intraspecific body size frequency distributions (IaBSFDs) are more poorly known, and their variation among ... -
Introduction to the special issue : tree invasions : towards a better understanding of their complex evolutionary dynamics
(Oxford University Press on behalf of the Annals of Botany Company, 2017)Many invasive plants show evidence of trait-based evolutionary change, but these remain largely unexplored for invasive trees. The increasing number of invasive trees and their tremendous impacts worldwide, however, ... -
Invasion science for society : a decade of contributions from the Centre for Invasion Biology
(Academy of Science of South Africa, 2014)Biological invasions are a growing problem worldwide. In 2004, the South African Department of Science and Technology, through the National Research Foundation, established a Centre of Excellence for Invasion Biology, ... -
Invasive amphibians in southern Africa : a review of invasion pathways
(AOSIS Publishing, 2017)Background: Globally, invasive amphibians are known for their environmental and social impacts that range from poisoning of local fauna and human populations to direct predation on other amphibians. Although several ... -
Invasive frogs in Sao Paulo display a substantial invasion lag
(European Geosciences Union, 2018)ENGLISH ABSTRACT: The first report of the invasion of the Robber frog Eleutherodactylus johnstonei Barbour, 1914 in the municipality of São Paulo was made in 2014. However, we report here that sound records of this species ...
