Multivariate morphometric and allozymic analysis of theConospermum taxifolium (Proteaceae) species complex

Mackay, David; Morrison, David A.

doi:10.1007/bf00937882

Cited by 5 publications

(13 citation statements)

References 15 publications

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“…The Tasmanian and Blue Mountains forms were excluded from our study because their taxonomic status is uncertain, and moreover they are allopatric to the common form. C. ericifolium and C. ellipticum are closely related to C. tax@lium (Mackay & Morrison, 1989), and are confined to the Sydney region of New South Wales.…”

Section: ?He Speciesmentioning

confidence: 99%

“…Conoqmum (Proteaceae) is a genus of about 40 endemic Australian species of perennial sclerophyllous shrubs Wohnson & Briggs, 1975), six of which occur in New South Wales (Mackay, 1991). Two of these New South Wales species are morphologically quite distinct from the others, but morphological intermediates are known to occur rarely in the Sydney region between the other four species:-C. tax@lium Smith, C. eriqfilium Smith, C, ellipticum Smith and C. longzzlium Smith Wohnson & McGillivray, 1975;Beadle, Evans & Carolin, 1982;Mackay & Morrison, 1989;Mackay, 1991). These intermediates are presumed to be hybrids, which form because of incomplete reproductive isolation between the four gene pools or when these isolation mechanisms break down (Mackay & Morrison, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Two of these New South Wales species are morphologically quite distinct from the others, but morphological intermediates are known to occur rarely in the Sydney region between the other four species:-C. tax@lium Smith, C. eriqfilium Smith, C, ellipticum Smith and C. longzzlium Smith Wohnson & McGillivray, 1975;Beadle, Evans & Carolin, 1982;Mackay & Morrison, 1989;Mackay, 1991). These intermediates are presumed to be hybrids, which form because of incomplete reproductive isolation between the four gene pools or when these isolation mechanisms break down (Mackay & Morrison, 1989). Mackay & Morrison (1989) hypothesized that geographical isolation may be primarily responsible for preventing gene flow between C. erictjjlium and C. elltjiticum, while ecological segregation isolates C. tax@lium from these two species.…”

Section: Introductionmentioning

confidence: 99%

“…These intermediates are presumed to be hybrids, which form because of incomplete reproductive isolation between the four gene pools or when these isolation mechanisms break down (Mackay & Morrison, 1989). Mackay & Morrison (1989) hypothesized that geographical isolation may be primarily responsible for preventing gene flow between C. erictjjlium and C. elltjiticum, while ecological segregation isolates C. tax@lium from these two species. They suggested that C. longzfolium is isolated from the other three species by a post-fertilization mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…We wished to quantify what appear to be only partially successful reproductive barriers between these four species, because each species appears to retain its morphological identity in the presence of hybrids (Mackay & Morrison, 1989). We also wanted to explain the distribution and abundance of these hybrids as a consequence of the types of reproductive isolation mechanisms that are operating between the four parent species.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive isolation mechanisms among four closely-related species of Conospermum (Proteaceae)

Morrison

McDonald

Bankoff

et al. 1994

Botanical Journal of the Linnean Society

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The effectiveness of geographical isolation, ecological isolation, temporal isolation, mechanical isolation, ethological isolation, cross‐incompatibility, hybrid inviability, hybrid sterility and hybrid breakdown as practical barriers to gene flow in the field between Conospermum taxifolium, C. ericifolium, C. ellipticum and C. longifolium has been quantified. The barriers to gene flow between C. ericifolium and C. ellipticum are completely effective, owing to their allopatric distributions. The barriers to gene flow between C. taxifolium and these two species are only partially effective, as their ecological separation breaks down in intermediate habitats, and partially‐fertile F1 plants can grow in the areas of overlap. The barriers to gene flow between C. longifolium and the other three species are almost completely effective, as cross‐incompatibility is very high and the F1 plants are female‐sterile.

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Section: ?He Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reproductive isolation mechanisms among four closely-related species of Conospermum (Proteaceae)

Morrison

McDonald

Bankoff

et al. 1994

Botanical Journal of the Linnean Society

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Morphological and genetic variation in the Senecio pinnatifolius complex: are variants worthy of taxonomic recognition?

Radford¹,

Cousens²,

Michael³

2004

Aust. Systematic Bot.

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The current taxonomy of the Senecio pinnatifolius complex (formerly Australian S. lautus) is inadequate in describing intra-specific variation. We present several putative taxa as alternatives to current subspecies, based on variants observed during both herbarium surveys and field studies. We sought to establish whether these taxa were objectively justified in terms of morphology and genetic relationships. This was done in three ways. First, a morphometric study of plants grown under standard conditions was undertaken. Second, isozymes were analysed to establish genetic relationships within the complex. Third, achene morphology was examined by scanning electron microscopy. Variants from central Queensland (BRIGALOW V.) and the deserts of central and Western Australia (DESERT V.) were clearly separated from all other variants based on the number of involucral bracts. This differentiation into two major groups may warrant subspecific recognition. Although variation within each of the proposed subspecies was continuous, separation of variants was possible based on statistical survey. This is consistent with their formal recognition as varieties. Further work is required to determine correct nomenclature of proposed subspecies and varieties, and to fully elucidate variation and provenance in inland forms.

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An investigation of taxon boundaries in rare and range-restricted Synaphea (Proteaceae: Conosperminae) species from south-west Western Australia

Butcher

Thiele

2014

Aust. Systematic Bot.

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The Swan Coastal Plain of south-west Western Australia has been extensively cleared since European settlement, with the fertile Pinjarra Plain land system preferentially cleared for grazing; what remains of the native vegetation is of high conservation value despite being highly fragmented and often degraded. The following six taxa of Synaphea R.Br. (Proteaceae), with conservation status corresponding to IUCN Red List categories Threatened and Data Deficient, are restricted to vegetation remnants in this region: S. stenoloba A.S.George, S. odocoileops A.S.George, S. sp. Pinjarra (R. Davis 6578), S. sp. Fairbridge Farm (D. Papenfus 696), S. sp. Pinjarra Plain (A.S. George 17182) and S. sp. Serpentine (G.R. Brand 103). Taxonomic boundaries among these morphologically similar taxa of Synaphea were investigated using morphometric analyses based on characters of leaves, inflorescences, flowers and fruits. Results allow the circumscription of the four informally named taxa from this complex, which will enable their formal description in a subsequent publication. They also provide support for several morphologically closely related taxa, including the provisional distinction of S. sp. Udumung (A.S. George 17058) from close ally S. decorticans Lindl. Two described species (S. odocoileops and S. stenoloba) and several anomalous specimens could not be adequately resolved in these analyses, and further investigation of their boundaries using molecular markers is required.

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Multivariate morphometric and allozymic analysis of theConospermum taxifolium (Proteaceae) species complex

Cited by 5 publications

References 15 publications

Reproductive isolation mechanisms among four closely-related species of Conospermum (Proteaceae)

Reproductive isolation mechanisms among four closely-related species of Conospermum (Proteaceae)

Morphological and genetic variation in the Senecio pinnatifolius complex: are variants worthy of taxonomic recognition?

An investigation of taxon boundaries in rare and range-restricted Synaphea (Proteaceae: Conosperminae) species from south-west Western Australia

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