Strategy and Tactics: Chinese Immigrants and Diasporic Spaces in Johannesburg, South Africa

Harrison, Philip; Moyo, Khangelani; Yan, Yang

doi:10.1080/03057070.2012.741013

Cited by 76 publications

(62 citation statements)

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“…We used data on pied crow occurrence from the first and second Southern African Bird Atlas Projects (SABAP1, 1987-1993, Harrison 1997and SABAP2, 2007-ongoing; we used data up to August 2012; http://sabap2.adu.org.za/). SABAP is a citizen science survey, based on checklist surveys (also known as 'cards'), which record all the bird species seen in a given area, over a given period of time (minimum 2 h, max 1 month).…”

Section: Pied Crow Survey Datamentioning

confidence: 99%

Electric crows: powerlines, climate change and the emergence of a native invader

Cunningham

Madden

Barnard

et al. 2015

Diversity and Distributions

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Aim Climate change and other anthropogenic global change drivers act in complex, mutually exacerbating ways to alter the abundance and distribution of species. In South Africa, pied crows Corvus albus have increased in numbers and range in recent decades. Popular opinion links these changes to urbanisation and infrastructure development, but there has been no empirical test of this idea. We aimed to clarify the drivers of pied crow population changes in South Africa.Location South Africa.Methods We used publicly available long-term datasets, the Southern African Bird Atlas Project and University of Delaware Gridded Climate Database, and spatial data from government bodies, to assess relationships between pied crow population and range changes, land use, infrastructure, urbanisation and climate change.Results Pied crow numbers have increased significantly in the past three decades, but rate of increase varied geographically, with crows declining in the northeast and increasing in the south-west of South Africa. Pied crow population changes were strongly correlated with climate change. Crows have benefited most from climate warming in the shrubland biomes of south-western South Africa. Pied crows are tree nesters, and within these shrublands, there is a strong positive relationship between the rate of population increase and the density of powerline infrastructure, which may facilitate pied crows' increase by providing nesting sites.Main conclusions Pied crow numbers have increased in response to climate warming, with their spread facilitated by electrical infrastructure in south-western South Africa, providing a clear example of compound influence of multiple global change drivers promoting a significant change in species range and reporting rate. Pied crows are generalist predators and there is popular concern about their ecological impact in areas where increases have occurred. We highlight the importance of understanding the ecosystem-level implications of increased numbers of pied crows in South Africa's shrubland biomes.

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Section: Pied Crow Survey Datamentioning

confidence: 99%

Electric crows: powerlines, climate change and the emergence of a native invader

Cunningham

Madden

Barnard

et al. 2015

Diversity and Distributions

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“…Since birds are able to travel further than beetles, involvement of Protea-pollinating birds, such as sunbirds and sugarbirds (Collins & Rebelo, 1987), in the dispersal of ophiostomatoid fungi could explain the widespread gene flow between these two distantly separated populations. The cape sugarbird, Promerops cafer, and the malachite sunbird, Nectarinia famosa, have both been noted to fly to 160 km (Fraser et al, 1989;Harrison et al, 1997) within the Core Cape Subregion (CCR) and would be good candidates for further investigation of this hypothesis.…”

Section: Long-distance Dispersal Between Distant K Proteae Populationsmentioning

confidence: 99%

Long-distance dispersal and recolonization of a fire-destroyed niche by a mite-associated fungus

et al. 2015

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The Fynbos Biome in the Core Cape Subregion of South Africa is prone to recurrent fires that can clear vast areas of vegetation. Between periods of fire, ophiostomatoid fungi colonize the fruiting structures of serotinous Protea species through arthropod-mediated dispersal. Using microsatellite markers, this study considered the process whereby a Protea-associated ophiostomatoid fungus, Knoxdaviesia proteae, recolonizes a burnt area. The genetic diversity, composition and structure of fungal populations from young P. repens plants in a recently burnt area were compared to populations from the adjacent, unburnt Protea population. The only difference between K. proteae populations from the two areas was found in the number of private alleles, which was significantly higher in the unburnt population. The population structure, although weak, indicated that most K. proteae 1 individuals from recently burnt areas originated from the unburnt population. However, individuals from unsampled source populations were also detected. This, together with the lack of isolation-by-distance across the landscape, suggested that long-distance dispersal is important for K. proteae to recolonize burnt areas. Similarly, the high level of gene flow and low differentiation observed between two distantly separated K. proteae populations also supported the existence of long-distance dispersal. The genetic cohesiveness of populations over long distances and the genetic diversity within populations could be attributed to frequent multiple fungal migration events mediated primarily by arthropods but, potentially, also by birds.

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“…Since the 1930s, a small but consolidated breeding population has established near Cape Town, South Africa, at the southerly extent of the eastern population migratory path (Harrison et al 1997). Data from dispersal studies are limited, but in Poland, median dispersal distances are only 26 km, although have been recorded at 462 km from the natal site (Chernetsov et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Is population structure in theEuropean white stork determined by flyway permeability rather than translocation history?

Shephard

Ogden

Tryjanowski

et al. 2013

Ecology and Evolution

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European white stork are long considered to diverge to eastern and western migration pools as a result of independent overwintering flyways. In relatively recent times, the western and northern distribution has been subject to dramatic population declines and country-specific extirpations. A number of independent reintroduction programs were started in the mid 1950s to bring storks back to historical ranges. Founder individuals were sourced opportunistically from the Eastern and Western European distributions and Algeria, leading to significant artificial mixing between eastern and western flyways. Here we use mitochondrial and microsatellite DNA to test the contention that prior to translocation, eastern and western flyways were genetically distinct. The data show a surprising lack of structure at any spatial or temporal scale suggesting that even though birds were moved between flyways, there is evidence of natural mixing prior to the onset of translocation activities. Overall a high retention of genetic diversity, high Nef, and an apparent absence of recent genetic bottleneck associated with early 20th century declines suggest that the species is well equipped to respond to future environmental pressures.

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Strategy and Tactics: Chinese Immigrants and Diasporic Spaces in Johannesburg, South Africa

Cited by 76 publications

References 0 publications

Electric crows: powerlines, climate change and the emergence of a native invader

Electric crows: powerlines, climate change and the emergence of a native invader

Long-distance dispersal and recolonization of a fire-destroyed niche by a mite-associated fungus

Is population structure in theEuropean white stork determined by flyway permeability rather than translocation history?

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