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Your search keyword '"Manning, John C."' showing total 183 results
Start Over Author "Manning, John C." Publication Type Academic Journals Publication Type Book Reviews
183 results on '"Manning, John C."'

4. Fine‐scale bee species distribution models: Hotspots of richness and endemism in South Africa with species‐area comparisons.

Author

Melin, Annalie, Beale, Colin M., Manning, John C., and Colville, Jonathan F.

Subjects
SPECIES distribution, ENDEMIC species, NATURAL history, BEES, SPECIES diversity, HONEYBEES, DATABASES, BIOMES
Abstract

While global patterns of bee diversity have been modelled, our understanding of fine‐scale regional patterns is more limited, particularly for under‐sampled regions such as Africa. South Africa is among the exceptions on the African continent; its bee fauna (ca. 1253 species) has been well collected and documented, including mass digitising of its natural history collections. It is a region with high floral diversity, high habitat heterogeneity and variable rainfall seasonality.Here, we combine a South African bee species distributional database (877 bee species) with a geospatial modelling approach to determine fine‐scale (~11 × 11 km grid cell resolution) hotspots of bee species richness, endemism and range‐restricted species.Our analyses, based on the probabilities of occurrence surfaces for each species across 108,803 two‐minute grid cells, reveal three bee hotspots of richness: Winter rainfall, Aseasonal rainfall and Early‐to‐late summer rainfall. These hotspots contain large numbers of endemic and geographically restricted taxa. Hotspots with particularly high bee diversity include the Fynbos, Succulent Karoo and Desert biomes; the latter showing 6–20 times more species per unit area than other biomes. Our results conform with global species‐area patterns: areas of higher‐than‐expected bee density are largely concentrated in Mediterranean and arid habitats.This study further enhances our knowledge in identifying regional and global hotspots of richness and endemism for a keystone group of insects and enabling these to be accounted for when setting conservation priorities. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Producing a plant diversity portal for South Africa

Author

le Roux, M. Marianne, Wilkin, Paul, Balkwill, Kevin, Boatwright, J. Stephen, Bytebier, Benny, Filer, Denis, Klak, Cornelia, Klopper, Ronell R., Koekemoer, Marinda, Livermore, Laurence, Lubke, Roy, Magee, Anthony R., Manning, John C., Paton, Alan, Pearce, Tim, Slingsby, Jasper, van Wyk, Ben-Erik, Victor, Janine E., and von Staden, Lize

Published
2017

35. Evolutionary patterns in South African brambles (Rubus L.) – new insights from molecular markers.

Author

Sochor, Michal and Manning, John C.

Subjects
*RUBUS, *GENE flow, *RIBOSOMAL DNA, *SPECIES hybridization, *NUCLEAR DNA, *POLYPLOIDY, *INTROGRESSION (Genetics)
Abstract

Background: South African brambles (Rubus L., Rosaceae) represent a complex group of six native species and at least 12 introduced taxa with different ploidy levels and varying tendencies to hybridisation. The role of hybridisation, introgression and apomixis in the ongoing evolution has been hypothesised based on morphological observations, but it has not been rigorously studied to date, and nor has the phylogeny of the group. Objectives and methods: This paper aims to reveal the evolutionary patterns and mechanisms in South African brambles by employing three types of molecular markers: plastid and nuclear ribosomal DNA sequences, and nuclear microsatellites. Results: The data confirmed the tetraploid R. thaumasius A.Beek and diploid R. ludwigii Eckl. & Zeyh. as distinct native species, while the other four native species are shown to be closely related and likely derived from three ancestors. Conclusion: Ancient hybridisation and limited gene flow between regions (particularly between winter- and summer-rainfall zones) appear to be the main drivers of current patterns in the tetraploid R. pinnatus Willd. and hexaploid R. rigidus Sm. Current hybridisation is also likely, although rare. The mechanism of ‘octoploid bridge’ is proposed, which overcomes the ploidy reproduction barrier between R. pinnatus (or other tetraploids) and R. rigidus. No gene flow was detected between native and alien taxa, but clonal duplications were discovered in the R. bergii × pinnatus hybrid, which implies the possibility of apomictic spread of homoploid hybrids formed between native and introduced brambles and the potential for a new invasion. On the other hand, heteroploid hybrids (R. bergii × rigidus) are formed recurrently and spread only vegetatively. [ABSTRACT FROM AUTHOR]

Published
2023
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