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479 results on '"McGlone, Matt"'

27. Genotypic variation, phylogeography, unified species concept, and the 'grey zone' of taxonomic uncertainty in kānuka: recognition of Kunzea ericoides (A.Rich.) Joy Thomps. sens. lat. (Myrtaceae).

Author

Heenan, Peter B., McGlone, Matt S., Mitchell, Caroline M., McCarthy, James K., and Houliston, Gary J.

Subjects
*PHYLOGEOGRAPHY, *POPULATION differentiation, *SINGLE nucleotide polymorphisms, *GENOTYPES, *PLANT classification, *SPECIES, *GENE flow, REPRODUCTIVE isolation
Abstract

In vascular plant systematics there are sometimes conflicts between phenotypic and ecotypic variation and genetic differentiation that challenge species concepts, introduce taxonomic confusion, and create nomenclatural uncertainty. Until a 2014 taxonomic revision that segregated Kunzea ericoides into 10 species, it and K. sinclairii were the only species recognised in New Zealand. A recent DNA microsatellite study failed to support any of the new species, instead revealing biogeographic variation. Here we present the results of a genotyping by sequencing study with 1,361 single nucleotide polymorphisms (SNPs), sampling 48 populations representing four Kunzea species from South Island and southern North Island. The SNP study confirms the microsatellite findings: the two widespread species, K. robusta and K. serotina, are indistinguishable and share northern and southern genotypes with other species; a single metapopulation lineage reflects a national north-to-south clinal pattern; and population differentiation is low and net migration high. A significant isolation by distance pattern was revealed with SNPs. The 2014 revision was explicitly based on the unified species concept, but the primary criterion, that each species represents a separate metapopulation lineage, was not demonstrated. Species recognition was based on morphological and ecological criteria that have proved difficult to apply. Applying the unified species concept and the primary criterion of a single metapopulation genetic lineage, we now recognise just a single New Zealand species, K. ericoides, with other species constituting taxonomic synonyms. In doing so, we distinguish a grey zone of taxonomic uncertainty that reflects incomplete lineage sorting, gene flow coupled with a lack of reproductive isolation, and only partial ecotypic and phenotypic differentiation. As demonstrated in the Kunzea revision, there is considerable phenotypic and ecotypic variation in regional populations that is likely to be of ecological and conservation importance. We suggest informal ecotypes are a better way to recognise this level of variation. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Past and future global transformation of terrestrial ecosystems under climate change

Author

Nolan, Connor, Overpeck, Jonathan T., Allen, Judy R. M., Anderson, Patricia M., Betancourt, Julio L., Binney, Heather A., Brewer, Simon, Bush, Mark B., Chase, Brian M., Cheddadi, Rachid, Djamali, Morteza, Dodson, John, Edwards, Mary E., Gosling, William D., Haberle, Simon, Hotchkiss, Sara C., Huntley, Brian, Ivory, Sarah J., Kershaw, A. Peter, Kim, Soo-Hyun, Latorre, Claudio, Leydet, Michelle, Lézine, Anne-Marie, Liu, Kam-Biu, Liu, Yao, Lozhkin, A. V., McGlone, Matt S., Marchant, Robert A., Momohara, Arata, Moreno, Patricio I., Müller, Stefanie, Otto-Bliesner, Bette L., Shen, Caiming, Stevenson, Janelle, Takahara, Hikaru, Tarasov, Pavel E., Tipton, John, Vincens, Annie, Weng, Chengyu, Xu, Qinghai, Zheng, Zhuo, and Jackson, Stephen T.

Published
2018

33. Adrift in the Anthropocene

Author

Shulmeister, James, Davies, Timothy R. H., Bostock, Helen, Purdie, Heather, Nicol, Andrew, Shane, Philip A., McGlone, Matt, O’Cofaigh, Colm, Series editor, and Shulmeister, James, editor

Published
2017
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39. Sexual systems in the New Zealand angiosperm flora.

Author

McGlone, Matt S. and Richardson, Sarah J.

Subjects
*BOTANY, *ANGIOSPERMS, *WOODY plants, *SHRUBS, *POLLINATION, *TEMPERATE forests, *GENDER
Abstract

We present data on sexual systems and associated traits in the New Zealand angiosperm flora and discuss reasons for the anomalously high levels of gender dimorphism in the flora, and the low levels of monoecy in woody species. Along with Hawai’i and New Caledonia, New Zealand has exceptionally high levels of gender dimorphism (19.5% of angiosperm species). The plant traits associated with gender dimorphism (woody growth, small, unspecialised white to yellow-green flowers, abiotic pollination, fleshy fruit) are the same as those in other regions and most gender dimorphic species belong to lineages that were already gender dimorphic on arrival in New Zealand. We attribute the high levels of gender dimorphism to several distinct factors. New Zealand’s evergreen forests have many small trees and understorey shrubs with fleshy fruit and small, open, inconspicuous flowers, a combination characterised by high levels of gender dimorphism elsewhere. Many of these species belong to lineages that migrated from the tropical north, a region with high levels of gender dimorphism. In comparison with many other regions, the New Zealand angiosperm flora has few annuals, and few plants with large, specialised flowers or pollinated by birds, traits elsewhere associated with exceedingly low levels of gender dimorphism. Finally, chance may have played a role through the association of gender dimorphism with rapidly radiating lineages. While the New Zealand angiosperm flora has similar levels of monoecy (14.2%) to other comparable regions, monoecy is exceptionally uncommon in the tree flora (3.4% for strictly monoecious species). However, the endemic Nothofagaceae and introduced woody monoecious species thrive in New Zealand. We suggest it is the lack of temperate sources for monoecious tree species, combined with the difficulty large-fruited monoecious tropical species have in crossing ocean gaps that may be ultimate reason for their failure to establish in greater numbers. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Genotypic variation, phylogeography, unified species concept, and the ‘grey zone’ of taxonomic uncertainty in kānuka: recognition of Kunzea ericoides(A.Rich.) Joy Thomps. sens. lat. (Myrtaceae)

Author

Heenan, Peter B., McGlone, Matt S., Mitchell, Caroline M., McCarthy, James K., and Houliston, Gary J.

Abstract

ABSTRACTIn vascular plant systematics there are sometimes conflicts between phenotypic and ecotypic variation and genetic differentiation that challenge species concepts, introduce taxonomic confusion, and create nomenclatural uncertainty. Until a 2014 taxonomic revision that segregated Kunzea ericoidesinto 10 species, it and K. sinclairiiwere the only species recognised in New Zealand. A recent DNA microsatellite study failed to support any of the new species, instead revealing biogeographic variation. Here we present the results of a genotyping by sequencing study with 1,361 single nucleotide polymorphisms (SNPs), sampling 48 populations representing four Kunzeaspecies from South Island and southern North Island. The SNP study confirms the microsatellite findings: the two widespread species, K. robustaand K. serotina, are indistinguishable and share northern and southern genotypes with other species; a single metapopulation lineage reflects a national north-to-south clinal pattern; and population differentiation is low and net migration high. A significant isolation by distance pattern was revealed with SNPs. The 2014 revision was explicitly based on the unified species concept, but the primary criterion, that each species represents a separate metapopulation lineage, was not demonstrated. Species recognition was based on morphological and ecological criteria that have proved difficult to apply. Applying the unified species concept and the primary criterion of a single metapopulation genetic lineage, we now recognise just a single New Zealand species, K. ericoides, with other species constituting taxonomic synonyms. In doing so, we distinguish a grey zone of taxonomic uncertainty that reflects incomplete lineage sorting, gene flow coupled with a lack of reproductive isolation, and only partial ecotypic and phenotypic differentiation. As demonstrated in the Kunzearevision, there is considerable phenotypic and ecotypic variation in regional populations that is likely to be of ecological and conservation importance. We suggest informal ecotypes are a better way to recognise this level of variation.

Published
2024
Full Text
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48. A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum

Author

Bentley, Michael J., Ó Cofaigh, Colm, Anderson, John B., Conway, Howard, Davies, Bethan, Graham, Alastair G.C., Hillenbrand, Claus-Dieter, Hodgson, Dominic A., Jamieson, Stewart S.R., Larter, Robert D., Mackintosh, Andrew, Smith, James A., Verleyen, Elie, Ackert, Robert P., Bart, Philip J., Berg, Sonja, Brunstein, Daniel, Canals, Miquel, Colhoun, Eric A., Crosta, Xavier, Dickens, William A., Domack, Eugene, Dowdeswell, Julian A., Dunbar, Robert, Ehrmann, Werner, Evans, Jeffrey, Favier, Vincent, Fink, David, Fogwill, Christopher J., Glasser, Neil F., Gohl, Karsten, Golledge, Nicholas R., Goodwin, Ian, Gore, Damian B., Greenwood, Sarah L., Hall, Brenda L., Hall, Kevin, Hedding, David W., Hein, Andrew S., Hocking, Emma P., Jakobsson, Martin, Johnson, Joanne S., Jomelli, Vincent, Jones, R. Selwyn, Klages, Johann P., Kristoffersen, Yngve, Kuhn, Gerhard, Leventer, Amy, Licht, Kathy, Lilly, Katherine, Lindow, Julia, Livingstone, Stephen J., Massé, Guillaume, McGlone, Matt S., McKay, Robert M., Melles, Martin, Miura, Hideki, Mulvaney, Robert, Nel, Werner, Nitsche, Frank O., O'Brien, Philip E., Post, Alexandra L., Roberts, Stephen J., Saunders, Krystyna M., Selkirk, Patricia M., Simms, Alexander R., Spiegel, Cornelia, Stolldorf, Travis D., Sugden, David E., van der Putten, Nathalie, van Ommen, Tas, Verfaillie, Deborah, Vyverman, Wim, Wagner, Bernd, White, Duanne A., Witus, Alexandra E., and Zwartz, Dan

Published
2014
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49. Terrestrial and submarine evidence for the extent and timing of the Last Glacial Maximum and the onset of deglaciation on the maritime-Antarctic and sub-Antarctic islands

Author

Hodgson, Dominic A., Graham, Alastair G.C., Roberts, Stephen J., Bentley, Michael J., Cofaigh, Colm Ó, Verleyen, Elie, Vyverman, Wim, Jomelli, Vincent, Favier, Vincent, Brunstein, Daniel, Verfaillie, Deborah, Colhoun, Eric A., Saunders, Krystyna M., Selkirk, Patricia M., Mackintosh, Andrew, Hedding, David W., Nel, Werner, Hall, Kevin, McGlone, Matt S., Van der Putten, Nathalie, Dickens, William A., and Smith, James A.

Published
2014
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