Browsing Research Articles (Botany and Zoology) by Title
Now showing items 89-108 of 337
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Eco-evolutionary feedback and the invasion of cooperation in prisoner's dilemma games
(Public Library of Science, 2011-11-18)Unveiling the origin and forms of cooperation in nature poses profound challenges in evolutionary ecology. The prisoner's dilemma game is an important metaphor for studying the evolution of cooperation. We here classified ... -
Ecological disequilibrium drives insect pest and pathogen accumulation in non-native trees
(Oxford University Press on behalf of the Annals of Botany Company, 2017)Non-native trees have become dominant components of many landscapes, including urban ecosystems, commercial forestry plantations, fruit orchards and as invasives in natural ecosystems. Often, these trees have been separated ... -
The ecology, biogeography, history and future of two globally important weeds : Cardiospermum halicacabum Linn. and C. grandiflorum Sw.
(Pensoft, 2013-10-11)Members of the balloon vine genus, Cardiospermum, have been extensively moved around the globe as medicinal and horticultural species, two of which are now widespread invasive species; Cardiospermum grandiflorum and ... -
The effect of grapevine rootstock on the performance of vitis vinifera L. ( cv. colombard) on a relatively saline soil
(South African Society for Enology and Viticulture, 1991)The performance of grapevine cv. Colom bard grafted onto 25 rootstocks (1045P, 1103P, 775P, 99R, (RY 13), 99R (RY 2), UOR, 140Ru, 143-B Mgt, 101-14 Mgt, Ramsey, 13-5 EVEX, Constantia Metallica, Jacquez, Grezot 1, 216/3 ... -
The effect of partial defoliation on growth characteristics of vitis vinifera L. cv. cabemet sauvignon I. vegetative growth
(South African Society for Enology and Viticulture, 1990)The effect of partial defoliation of the whole canopy on vegetative growth of Vitis vinifera L. cv. Cabernet Sauvignon was investigated. Vegetative growth of vines followed the well-known pattern for 0%, 33% and 66% ... -
The effect of partial defoliation on quality characteristics of Vitis vinifera L. cv. Cabernet Sauvignon grapes 1. Sugars, acids and pH
(South African Society for Enology and Viticulture, 1991)The effect was studied of partial defoliation (33% and 66%) on the sugar and acid accumulation and pH in grapes of Vitis vinifera L. cv. Cabernet Sauvignon. Although the total soluble sugar (TSS) in grapes of partially ... -
The effect of partial defoliation, leaf position and developmental stage of the vine on leaf chlorophyll concentration in relation to the photosynthetic activity and light intensity in the canopy of Vitis vinifera L. cv. Cabernet Sauvignon
(South African Society for Enology and Viticulture, 1989)The effect of partial defoliation and leaf position on leaf chlorophyll concentration in relation to the photosynthetic activity and light intensity in the canopy of Vitis vinifera L. cv. Cabernet Sauvignon was investigated ... -
The effect of partial defoliation, leaf position and developmental stage of the vine on the photosynthetic activity of vitis vinifera L. cv cabernet sauvignon
(South African Society for Enology and Viticulture, 1988)The effect of partial defoliation, leaf position and developmental stage of the vine on the photosynthesis, stomatal resistance and transpiration of Vitis vinifera L. cv Cabernet Sauvignon was investigated. Partially ... -
Effects of alien plant management, fire and soil chemistry on selected soil microbial populations in the Table Mountain National Park, South Africa
(NISC Pty Ltd., 2005-06)This pilot study examined changes in soil chemistry and microbial population sizes following the extensive wildfires in 2000 on the Cape Peninsula. The effects of standing alien plants and stacks of mechanically-cleared ... -
EMAPi 2015 : highlighting links between science and management of alien plant invasions
(Pensoft, 2016)The 13th International Conference on Ecology and Management of Alien Plant Invasions (EMAPi) was held in Waikoloa Village, Hawaii, 20–24 September 2015. EMAPi is the only international conference that focuses exclusively ... -
Enhanced plant performance in cicer arietinum L. due to the addition of a combination of plant growth-promoting bacteria
(MDPI, 2017)Current agriculture is based on external fertilizers that jeopardize soil fertility. Alternative fertilization systems might come from the use of soil-borne bacteria with plant growth enhancing ability. Here, six bacterial ... -
Entomology in South Africa : where do we come from, where are we now and where are we going?
(Academy of Science of South Africa, 2013)Entomology in South Africa can be traced back to the mid-18th century when Ryk Tulbagh was governor at the Cape from 1751 to 1771. Tulbagh was interested in nature and instructed his gardener, J.A. Auge, to collect plants, ... -
Entry of spermatozoa into the cervical mucosa and transmission of the AIDS virus
(Health & Medical Publishing Group, 1990)The phenomenon of entry of spermatozoa into the epithelial cells of the female genital tract has been re-investigated in the light of the controversy over whether spermatozoa could act as a vector for the transmission ... -
Environmental temperature alters the overall digestive energetics and differentially affects dietary protein and lipid use in a lizard
(The Company of Biologists, 2019)Processing food (e.g. ingestion, digestion, assimilation) requires energy referred to as specific dynamic action (SDA) and is at least partially fuelled by oxidation of the nutrients (e.g. proteins and lipids) within ... -
Evaluating invasion risk for freshwater fishes in South Africa
(AOSIS Publishing, 2017)Background: South Africa, as a signatory of the Convention on Biological Diversity, has an obligation to identify, prioritise and manage invasive species and their introduction pathways. However, this requires knowledge ... -
Even well-studied groups of alien species might be poorly inventoried : Australian Acacia species in South Africa as a case study
(Pensoft Publishers, 2018-06-26)ENGLISH ABSTRACT: Understanding the status and extent of spread of alien plants is crucial for effective management. We explore this issue using Australian Acacia species (wattles) in South Africa (a global hotspot for ... -
Evidence for panmixia despite barriers to gene flow in the southern African endemic, Caffrogobius caffer (Teleostei: Gobiidae)
(BioMed Central, 2008-12)Background: Oceanography and life-history characteristics are known to influence the genetic structure of marine species, however the relative role that these factors play in shaping phylogeographic patterns remains ... -
Evidence of repeated and independent saltational evolution in a peculiar genus of sphinx moths (Proserpinus : Sphingidae)
(Public Library of Science, 2008-12-24)Background: Saltational evolution in which a particular lineage undergoes relatively rapid, significant, and unparalleled change as compared with its closest relatives is rarely invoked as an alternative model to the ... -
Evolution from XIST-independent to XIST-controlled X-chromosome inactivation : epigenetic modifications in distantly related mammals
(Public Library of Science, 2011-04-25)X chromosome inactivation (XCI) is the transcriptional silencing of one X in female mammals, balancing expression of X genes between females (XX) and males (XY). In placental mammals non-coding XIST RNA triggers silencing ... -
Evolutionary dynamics of tree invasions : complementing the unified framework for biological invasions
(Oxford University Press on behalf of the Annals of Botany Company, 2017)Evolutionary processes greatly impact the outcomes of biological invasions. An extensive body of research suggests that invasive populations often undergo phenotypic and ecological divergence from their native sources. ...
