Johnson S
Recent Submissions
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Self-pollination and inbreeding depression in Acacia dealbata: Can selfing promote invasion in trees?
(Elsevier B.V., 2013)The ability to self-fertilise may promote invasiveness in plants by assuring reproductionwhen mate and pollinator availabilities are inadequate, provided that the benefit of increased fecundity via selfing is not outweighed ... -
Interactions between the invasive tree Melia azedarach (Meliaceae) and native frugivores in South Africa
(Cambridge University Press, 2011)The spread of many invasive plants is facilitated through seed dispersal by frugivorous animals. The effectiveness of various frugivores as dispersers of the seeds of Melia azedarach, a highly invasive alien tree species, ... -
The role of avian frugivores in germination of seeds of fleshy-fruited invasive alien plants
(Springer Science+Business Media B.V., 2011)Many highly invasive plant species have fleshy fruits which are eaten by native frugivorous animals. These frugivores play an important role in long-distance seed dispersal, and may also affect germination success. The aim ... -
Phylogenetically independent associations between autonomous self-fertilization and plant invasiveness
(The University of Chicago., 2008-02)Many plant species have been introduced from their native ranges to new continents, but few have become naturalized or, ultimately, invasive. It has been predicted that species that do not require the presence of compatible ... -
Reproductive assurance through self-fertilization does not vary with population size in the alien invasive plant Datura stramonium
(Nordic Ecological Society, 2007)Autonomous self-fertilization is suggested to be associated with invasiveness in plants because it offers reproductive assurance when there is a shortage of suitable mates or pollinators. Given that shortages of mates and ... -
Predicting naturalization of southern African Iridaceae in other regions
(British Ecological Society, 2007)1. One of the major challenges in invasion biology is to predict the likelihood of naturalization, and ultimately invasiveness, of species from properties that can be assessed in the native range prior to a species’ ... -
Effects of self-compatibility on the distribution range of invasive european plants in North America
(Society for Conservation Biology, 2007)Many plant species have been introduced to new continents, but only a small subset of these have become invasive. It has been predicted that self-compatible species, particularly those that do not need the services of ... -
Dissecting the plant–insect diversity relationship in the Cape
(Elsevier, 2009-04)It has been argued that insect diversity in the Cape is disproportionately low, considering the unusually high plant diversity in this region. Recent studies have shown that this is not the case, but the precise mechanisms ...
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