Browsing by Title

Racial mixing in South African honeybees: the effects of genotype mixing on reproductive traits of workers

Beekman, M.; Allsopp, M.H.; Holmes, M.J.; Lim, J.; Noach-Pienaar, L.A.; Wossler, T.C.; Oldroyd, B.P. (Springer-Verlag, 2012)

To test the hypothesis that the honeybee hybrid zone in South Africa is a tension zone due to increased reproductive conflict in colonies that contain both Apis mellifera capensis and Apis mellifera scutellata worker ...

Raising the flag on marine alien fouling species

Peters, K.; Sink, K.; Robinson, T.B. (REABIC, 2017)

Harbours are known introduction foci of marine alien species. They act as recipients of new introductions and as sources for regional spread. We report on subtidal surveys of fouling communities from 14 harbours along the ...

Range contraction to a higher elevation: the likely future of the montane vegetation in South Africa and Lesotho

Bentley, L.K.; Robertson, M.P.; Barker, N.P. (Springer, 2019)

Global climate change is a major challenge for the future with serious potential impacts on biodiversity. Biodiversity in mountains is particularly vulnerable as many montane species are adapted to narrow microhabitats, ...

Range expansions across ecoregions: interactions of climate change, physiology and genetic diversity

Rius, M.; Clusella-Trullas, S.; McQuaid, C.D.; Navarro, R.A.; Griffiths, C.L.; Matthee, C.A.; von der Heyden, S.; Turon, X. (John Wiley & Sons Ltd., 2014-01)

Aim Climate change is expected to drive range shifts among a wide array of organisms. Non-indigenous species (NIS) provide a unique opportunity to observe the establishment of range boundaries in a way that cannot be ...

Range-wide population viability analyses reveal high sensitivity to wildflower harvesting in extreme environments Range-wide population viability analyses reveal high sensitivity to wildflower harvesting in extreme environments

Treurnicht, M.; Schurr, F.M.; Slingsby, J.A.; Esler, K.J.; Pagel, J.; Treurnicht, M.; Schurr, F.M.; Slingsby, J.A.; Esler, K.J.; Pagel, J. (2021 2021)

Abstract 1. The ecological effects of harvesting from wild populations are often uncertain, especially since the sensitivity of populations to harvesting can vary across species’ geographical ranges. In the Cape Floristic ...

Ranking of invasive spread through urban green areas in the world’s 100 most populous cities

Hui, C.; Richardson, D.M.; Visser, V. (Springer, 2017)

Urban landscapes are highly fragmented (leading to the extinction of native species) as well as transformed and disturbed (creating novel environments). Such conditions provide non-native species with opportunities to ...

Rapid adaptation to invasive predators overwhelms natural gradients of intraspecific variation

Melotto, A.; Manenti, R.; Ficetola, G.F. (2020)

Invasive predators can exert strong selection on native populations. If selection is strong enough, populations could lose the phenotypic variation caused by adaptation to heterogeneous environments. We compare frog tadpoles ...

Rapid bioassessment of the effects of repeated rotenone treatments on invertebrate assemblages in the Rondegat River, South Africa

Bellingan, T.A.; Woodford, D.J.; Gouws, J.; Villet, M.H.; Weyl, O.L.F. (NISC (Pty) Ltd and Taylor & Francis, 2015)

The potential collateral effects of eradicating invasive fishes in streams necessitate the monitoring of invertebrate communities during treatment. In an environmental rehabilitation programme, non-native smallmouth bass ...

Rapid cold-hardening in a Karoo beetle, Afrinus sp.

Sinclair, B.J.; Chown, S.L. (The Royal Entomological Society, 2006)

In the insect rapid cold-hardening response, survival at subzero temperatures is greatly improved by a brief pre-exposure at a milder temperature. It is predicted that insects with minimal cold tolerance capabilities living ...

Rapid peripatric speciation linked with drainage evolution in a rare African rodent, Mastomys shortridgei (Rodentia: Muridae)

Eiseb, S.J.; Taylor, P.J.; Zeller, U.; Denys, C.; Nicolas, V. (2021)

The African rodent genus Mastomys contains eight species, some of which are widely distributed pest species and others which have restricted distribution. Most species are recognized only on chromosomal or molecular genetic ...

Rapid range expansion and community reorganization in response to warming

le Roux, P.C.; McGeoch, M.A. (Blackwell Publishing Ltd, 2008)

Species ranges are expected to expand along their cooler boundaries in response to rising temperatures associated with current global climate change. However, this ‘fingerprint’ of climate change is yet to be assessed ...

Rapid recovery of macroinvertebrates in a South African stream treated with rotenone

Bellingan, T.A.; Hugo, S.; Woodford, D.J.; Gouws, J.; Villet, M.H.; Weyl, O.L.F. (Springer, 2019)

South Africa’s Cape Fold Ecoregion supports a unique freshwater fish assemblage with many endemics. To mitigate impacts of alien invasive fishes on this unique assemblage, nature conservation authority CapeNature used ...

Rapid response to shoot removal by the invasive wetland plant, alligator weed (Alternanthera philoxeroides)

Wilson, J.R.U.; Yeates, A.; Schooler, S.; Julien, M.H. (Elsevier B.V., 2007)

Resprouting plants provide an interesting test to the generality of plant allometric relationships. The ability to rapidly resprout after disturbance also makes weeds more difficult to control. We performed a glasshouse ...

Rapid shifts in the temperature dependence of locomotor performance in an invasive frog, Xenopus laevis, implications for conservation

Araspin, L.; Martinez, A.S.; Wagener, C.; Courant, J.; Louppe, V.; Padilla, P.; Measey, J.; Herrel, A. (2020)

Temperature is a critical abiotic factor impacting all aspects of the biology of organisms, especially in ectotherms. As such, it is an important determinant of the potential invasive ability of organisms and may limit ...

A rapid survey of the invasive plant species in western Angola

Rejmanek, M.; Huntley, B.J.; Le Roux, J.J.; Richardson, D.M. (John Wiley & Sons, 2017)

Angola is one of the most neglected African countries in terms of botanical research, in respect of both native and naturalized species. We conducted a rapid assessment of invasive plant species in western Angola during ...

Rapid, field-deployable method for collecting and preserving plant metabolome for biochemical and functional characterization

Skubel, S.A.; Dushenkov, V.; Graf, B.L.; Niu, Q.; Poulev, A.; Kalariya, H.M.; Foxcroft, L.C.; Raskin, I. (Creative Commons Attribution License, 2018)

Study of plant metabolome is a growing field of science that catalogs vast biochemical and functional diversity of phytochemicals. However, collecting and storing samples of plant metabolome, sharing these samples across ...