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Allen Lowrie - One of the best experts on this subject based on the ideXlab platform.
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Drosera murfetii (Droseraceae): a new species from Tasmania, Australia
2014Co-Authors: Allen Lowrie, John G. ConranAbstract:Drosera murfetii Lowrie & Conran is a new species from south-west Tasmania, Australia, bearing mainly non-carnivorous leaves and usually several large flowers per inflorescence. It is compared to its morphologically closest taxon, Drosera arcturi Hook., with which it often grows. The two species are described and illustrated, a key to species and a comparison table of characters is provided. Drosera arcturi is lectotypified.
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A revision of the Drosera omissa/D-nitidula complex (Droseraceae) from south-west Western Australia
TAXON, 2007Co-Authors: Allen Lowrie, John G. ConranAbstract:The Drosera omissa/D. nitidula complex is revised. Drosera omissa is reinstated and found to be conspecific with D. ericksoniae, which is reduced to synonymy. The taxon corresponding to the type of D. nitidula is determined and D. allantostigma and D. leucostigma are elevated from subspecific to specific rank. Drosera patens (known previously as D. nitidula subsp. 'omissa' and D. nitidula 'var.?') is described as a new species. All five species are compared morphologically, described and illustrated. Cytological investigation found all species to have chromosome numbers of n = 14 and 2n = 28, suggesting a base number of x=7 for the complex.
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A taxonomic revision of Drosera section Stolonifera (Droseraceae), from south-west Western Australia
2005Co-Authors: Allen LowrieAbstract:Lowrie, A. A taxonomic revision of Drosera section Stolonifera (Droseraceae), from south-west Western Australia. Nuytsia 15(3): 355-393 (2005). Ten species are recognized in the Drosera section Stolonifera: D. fimbriata DeBuhr, D. humilis Planchon, D. platypoda Turcz., D. porrecta Lehm., D. purpurascens Schlott., D. ramellosa Lehm., and D. stolonifera Endl., including three new combinations: D. monticola (Lowrie & Marchant) Lowrie, D. prostrata (Marchant & Lowrie) Lowrie and D. rupicola (Marchant) Lowrie. All are endemic to the south-west of Western Australia and belong in Drosera L. subgen. Ergaleium DC. sect. Stolonifera DeBuhr. Each taxon is described in detail as well as illustrated. A key is provided to all taxa in sect. Stolonifera. A schematic illustration of all ten species life-form is provided for comparison and cross referencing with each other. SEM micrographs of the seeds of each species, field and cultivation studies and historical investigations are also presented.
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Drosera pedicellaris (Droseraceae), a new species from south-west Western Australia
2002Co-Authors: Allen LowrieAbstract:Lowrie, A. Drosera pedicellaris (Droseraceae), a new species from south-west Western Australia. Nuytsia 15(1): 59–62 (2002). A new species, Drosera pedicellaris Lowrie, is described and illustrated. It is related to D. parvula Planchon and is known from only two localities in the south-west of Western Australia.
Andreas Fleischmann - One of the best experts on this subject based on the ideXlab platform.
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A new and endemic species of Drosera (Droseraceae) from Madagascar
Plant Ecology and Evolution, 2020Co-Authors: Andreas Fleischmann, Paulo Minatel Gonella, Nivo Rakotoarivelo, Aymeric Roccia, Lala Roger Andriamiarisoa, Aina Razanatsima, Fortunat RakotoarivonyAbstract:Background and aims – This study is part of an ongoing revision of the world Drosera species. During herbarium revisions of Drosera from Madagascar, a new species was identified and is here described.Methods – The species’ morphology is described based on herbarium studies and observation of living plants in situ, and ecological notes from field observations are provided. The species is compared and contextualized within the current subgeneric classification of Drosera.Key results – The new species, Drosera arachnoides, is recognized as most closely related to another Malagasy-endemic, D. humbertii, from which it is morphologically and ecologically distinct. The new species is placed within D. subg. Drosera sect. Ptycnostigma. Based on the restricted occurrence, the species is assessed as Vulnerable, following IUCN categories and criteria. A key to the Drosera species from Madagascar is provided.Conclusion – Drosera arachnoides is the second endemic Drosera species in Madagascar and raises the total number of species on the island to six.
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A new pygmy sundew, Drosera albonotata (Droseraceae), from the western Wheatbelt and an updated diagnostic key to the orange-flowered pygmy Drosera of Western Australia.
Phytotaxa, 2018Co-Authors: Alastair S. Robinson, Adam T. Cross, Manfred E. Meisterl, Andreas FleischmannAbstract:A new species of Drosera — Drosera albonotata —from the western Wheatbelt (Western Australia) is described and illustrated. The taxon, which is largely restricted to sandy clay loam soils in Wandoo woodland and shrubland, is morphologically similar to D. miniata and D. coomallo but can be distinguished by its distinct floral features and ecology. A distribution map of the new species and its allies and a revised and updated diagnostic key to the twelve recognised orange-flowered pygmy Drosera in Western Australia are provided.
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where is my food brazilian flower fly steals prey from carnivorous sundews in a newly discovered plant animal interaction
PLOS ONE, 2016Co-Authors: Andreas Fleischmann, Fernando Rivadavia, Paulo Minatel Gonella, Celeste Perezbanon, Ximo Mengual, Santos RojoAbstract:A new interaction between insects and carnivorous plants is reported from Brazil. Larvae of the predatory flower fly Toxomerus basalis (Diptera: Syrphidae: Syrphinae) have been found scavenging on the sticky leaves of several carnivorous sundew species (Drosera, Droseraceae) in Minas Gerais and Sao Paulo states, SE Brazil. This syrphid apparently spends its whole larval stage feeding on prey trapped by Drosera leaves. The nature of this plant-animal relationship is discussed, as well as the Drosera species involved, and locations where T. basalis was observed. 180 years after the discovery of this flower fly species, its biology now has been revealed. This is (1) the first record of kleptoparasitism in the Syrphidae, (2) a new larval feeding mode for this family, and (3) the first report of a dipteran that shows a kleptoparasitic relationship with a carnivorous plant with adhesive flypaper traps. The first descriptions of the third instar larva and puparium of T. basalis based on Scanning Electron Microscope analysis are provided.
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Drosera magnifica (Droseraceae): the largest New World sundew, discovered on Facebook
Phytotaxa, 2015Co-Authors: Paulo Minatel Gonella, Fernando Rivadavia, Andreas FleischmannAbstract:Drosera magnifica , a microendemic sundew discovered on a single mountain top in eastern Minas Gerais (southeastern Brazil), is described here as a new species for science. Regarded as the largest New World sundew and one of the three largest Drosera species, it was just recently discovered through photographs posted on the social network Facebook. A detailed description, remarks on ecology, habitat, and conservation, a distribution map, line drawings, and photographs are provided, as well as a comparison between the related taxa ( D . graminifolia and D. spiralis ). The species is considered Critically Endangered, according to the IUCN Red List categories and criteria.
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is Drosera meristocaulis a pygmy sundew evidence of a long distance dispersal between western australia and northern south america
Annals of Botany, 2012Co-Authors: Fernando Rivadavia, V F O De Miranda, G Hoogenstrijd, Fabio Pinheiro, Gunther Heubl, Andreas FleischmannAbstract:† Background and aims South America and Oceania possess numerous floristic similarities, often confirmed by morphological and molecular data. The carnivorous Drosera meristocaulis (Droseraceae), endemic to the Neblina highlands of northern South America, was known to share morphological characters with the pygmy sundews of Drosera sect. Bryastrum, which are endemic to Australia and New Zealand. The inclusion of D. meristocaulis in a molecular phylogenetic analysis may clarify its systematic position and offer an opportunity to investigate character evolution in Droseraceae and phylogeographic patterns between South America and Oceania. † Methods Drosera meristocaulis was included in a molecular phylogenetic analysis of Droseraceae, using nuclear internal transcribed spacer (ITS) and plastid rbcL and rps16 sequence data. Pollen of D. meristocaulis was studied using light microscopy and scanning electron microscopy techniques, and the karyotype was inferred from root tip meristem. † Key Results The phylogenetic inferences (maximum parsimony, maximum likelihood and Bayesian approaches) substantiate with high statistical support the inclusion of sect. Meristocaulis and its single species, D. meristocaulis, within the Australian Drosera clade, sister to a group comprising species of sect. Bryastrum. A chromosome number of 2n ¼ approx. 32‐ 36 supports the phylogenetic position within the Australian clade. The undivided styles, conspicuous large setuous stipules, a cryptocotylar (hypogaeous) germination pattern and pollen tetrads with aperture of intermediate type 7‐8 are key morphological traits shared between D. meristocaulis and pygmy sundews of sect. Bryastrum from Australia and New Zealand. † Conclusions The multidisciplinary approach adopted in this study (using morphological, palynological, cytotaxonomic and molecular phylogenetic data) enabled us to elucidate the relationships of the thus far unplaced taxon D. meristocaulis. Long-distance dispersal between southwestern Oceania and northern South America is the most likely scenario to explain the phylogeographic pattern revealed.
John G. Conran - One of the best experts on this subject based on the ideXlab platform.
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Drosera murfetii (Droseraceae): a new species from Tasmania, Australia
2014Co-Authors: Allen Lowrie, John G. ConranAbstract:Drosera murfetii Lowrie & Conran is a new species from south-west Tasmania, Australia, bearing mainly non-carnivorous leaves and usually several large flowers per inflorescence. It is compared to its morphologically closest taxon, Drosera arcturi Hook., with which it often grows. The two species are described and illustrated, a key to species and a comparison table of characters is provided. Drosera arcturi is lectotypified.
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Drosera hookeri R.P.Gibson, B.J.Conn & Conran, a replacement name for Drosera foliosa Hook.f ex Planch., nom. illeg. (Droseraceae)
2010Co-Authors: Robert Peter Gibson, Barry John Conn, John G. ConranAbstract:Drosera hookeri R.P.Gibson, B.J.Conn & Conran (Droseraceae) is proposed as a replacement name for Drosera foliosa Hook.f. ex Planch., nom. illeg., non Elliot (1821).
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A revision of the Drosera omissa/D-nitidula complex (Droseraceae) from south-west Western Australia
TAXON, 2007Co-Authors: Allen Lowrie, John G. ConranAbstract:The Drosera omissa/D. nitidula complex is revised. Drosera omissa is reinstated and found to be conspecific with D. ericksoniae, which is reduced to synonymy. The taxon corresponding to the type of D. nitidula is determined and D. allantostigma and D. leucostigma are elevated from subspecific to specific rank. Drosera patens (known previously as D. nitidula subsp. 'omissa' and D. nitidula 'var.?') is described as a new species. All five species are compared morphologically, described and illustrated. Cytological investigation found all species to have chromosome numbers of n = 14 and 2n = 28, suggesting a base number of x=7 for the complex.
Fernando Rivadavia - One of the best experts on this subject based on the ideXlab platform.
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where is my food brazilian flower fly steals prey from carnivorous sundews in a newly discovered plant animal interaction
PLOS ONE, 2016Co-Authors: Andreas Fleischmann, Fernando Rivadavia, Paulo Minatel Gonella, Celeste Perezbanon, Ximo Mengual, Santos RojoAbstract:A new interaction between insects and carnivorous plants is reported from Brazil. Larvae of the predatory flower fly Toxomerus basalis (Diptera: Syrphidae: Syrphinae) have been found scavenging on the sticky leaves of several carnivorous sundew species (Drosera, Droseraceae) in Minas Gerais and Sao Paulo states, SE Brazil. This syrphid apparently spends its whole larval stage feeding on prey trapped by Drosera leaves. The nature of this plant-animal relationship is discussed, as well as the Drosera species involved, and locations where T. basalis was observed. 180 years after the discovery of this flower fly species, its biology now has been revealed. This is (1) the first record of kleptoparasitism in the Syrphidae, (2) a new larval feeding mode for this family, and (3) the first report of a dipteran that shows a kleptoparasitic relationship with a carnivorous plant with adhesive flypaper traps. The first descriptions of the third instar larva and puparium of T. basalis based on Scanning Electron Microscope analysis are provided.
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Drosera magnifica (Droseraceae): the largest New World sundew, discovered on Facebook
Phytotaxa, 2015Co-Authors: Paulo Minatel Gonella, Fernando Rivadavia, Andreas FleischmannAbstract:Drosera magnifica , a microendemic sundew discovered on a single mountain top in eastern Minas Gerais (southeastern Brazil), is described here as a new species for science. Regarded as the largest New World sundew and one of the three largest Drosera species, it was just recently discovered through photographs posted on the social network Facebook. A detailed description, remarks on ecology, habitat, and conservation, a distribution map, line drawings, and photographs are provided, as well as a comparison between the related taxa ( D . graminifolia and D. spiralis ). The species is considered Critically Endangered, according to the IUCN Red List categories and criteria.
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is Drosera meristocaulis a pygmy sundew evidence of a long distance dispersal between western australia and northern south america
Annals of Botany, 2012Co-Authors: Fernando Rivadavia, V F O De Miranda, G Hoogenstrijd, Fabio Pinheiro, Gunther Heubl, Andreas FleischmannAbstract:† Background and aims South America and Oceania possess numerous floristic similarities, often confirmed by morphological and molecular data. The carnivorous Drosera meristocaulis (Droseraceae), endemic to the Neblina highlands of northern South America, was known to share morphological characters with the pygmy sundews of Drosera sect. Bryastrum, which are endemic to Australia and New Zealand. The inclusion of D. meristocaulis in a molecular phylogenetic analysis may clarify its systematic position and offer an opportunity to investigate character evolution in Droseraceae and phylogeographic patterns between South America and Oceania. † Methods Drosera meristocaulis was included in a molecular phylogenetic analysis of Droseraceae, using nuclear internal transcribed spacer (ITS) and plastid rbcL and rps16 sequence data. Pollen of D. meristocaulis was studied using light microscopy and scanning electron microscopy techniques, and the karyotype was inferred from root tip meristem. † Key Results The phylogenetic inferences (maximum parsimony, maximum likelihood and Bayesian approaches) substantiate with high statistical support the inclusion of sect. Meristocaulis and its single species, D. meristocaulis, within the Australian Drosera clade, sister to a group comprising species of sect. Bryastrum. A chromosome number of 2n ¼ approx. 32‐ 36 supports the phylogenetic position within the Australian clade. The undivided styles, conspicuous large setuous stipules, a cryptocotylar (hypogaeous) germination pattern and pollen tetrads with aperture of intermediate type 7‐8 are key morphological traits shared between D. meristocaulis and pygmy sundews of sect. Bryastrum from Australia and New Zealand. † Conclusions The multidisciplinary approach adopted in this study (using morphological, palynological, cytotaxonomic and molecular phylogenetic data) enabled us to elucidate the relationships of the thus far unplaced taxon D. meristocaulis. Long-distance dispersal between southwestern Oceania and northern South America is the most likely scenario to explain the phylogeographic pattern revealed.
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Drosera quartzicola (Droseraceae), a new and threatened species from the Serra do Cipó, Brazil
Phytotaxa, 2011Co-Authors: Fernando Rivadavia, Paulo Minatel GonellaAbstract:Drosera quartzicola (Droseraceae), a new species from the Serra do Cipo highlands, Minas Gerais state, southeastern Brazil, is described here. The morphological characters that distinguish it from similar Drosera species are discussed, together with habitat information, detailed illustrations, and its conservation status. A key to the Drosera species of the Serra do Cipo is provided.
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Phylogeny of the sundews, Drosera (Droseraceae), based on chloroplast rbcL and nuclear 18S ribosomal DNA Sequences.
American journal of botany, 2003Co-Authors: Fernando Rivadavia, Katsuhiko Kondo, Masahiro Kato, Mitsuyasu HasebeAbstract:The sundew genus Drosera consists of carnivorous plants with active flypaper traps and includes nearly 150 species distributed mainly in Australia, Africa, and South America, with some Northern Hemisphere species. In addition to confused intrageneric classification of Drosera, the intergeneric relationships among the Drosera and two other genera in the Droseraceae with snap traps, Dionaea and Aldrovanda, are problematic. We conducted phylogenetic analyses of DNA sequences of the chloroplast rbcL gene for 59 species of Drosera, covering all sections except one. These analyses revealed that five of 11 sections, including three monotypic sections, are polyphyletic. Combined rbcL and 18S rDNA sequence data were used to infer phylogenetic relationships among Drosera, Dionaea, and Aldrovanda. This analysis revealed that all Drosera species form a clade sister to a clade including Dionaea and Aldrovanda, suggesting that the snap traps of Aldrovanda and Dionaea are homologous despite their morphological differences. MacClade reconstructions indicated that multiple episodes of aneuploidy occurred in a clade that includes mainly Australian species, while the chromosome numbers in the other clades are not as variable. Drosera regia, which is native to South Africa, and most species native to Australia, were clustered basally, suggesting that Drosera originated in Africa or Australia. The rbcL tree indicates that Australian species expanded their distribution to South America and then to Africa. Expansion of distribution to the Northern Hemisphere from the Southern Hemispere occurred in a few different lineages.
John S. Pate - One of the best experts on this subject based on the ideXlab platform.
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contrasting effects of supplementary feeding of insects or mineral nutrients on the growth and nitrogen and phosphorous economy of pygmy species of Drosera
Oecologia, 1992Co-Authors: P S Karlsson, John S. PateAbstract:Growth responses and accumulation of N and P were studied in two pygmy south-west Australian species of Drosera following supplementary feeding of arthropods (collembolans, Hypogastrura vernalis and fruit flies, Drosophila melanogaster) and/or a balanced mineral nutrient supplement (N as nitrate) via the roots. One feeding experiment used glasshouse-raised germlings from vegetative propagules (gemmae) of the perennial Drosera closterostigma, the other three (two on D. closterostigma and one on the annual D. glanduligera) involved natural populations engaging in natural captures of indigenous prey. All experiments recorded highly significant increases in plant dry matter, N and P (all plant age groups) and in reproductive performance (adult plants only) from artificial feeding of arthropods, but no apparent benefits from minerals alone or additive effects of minerals above that due to insects. Unresponsiveness to mineral nutrients was suggested to relate to inability of the species to use nitrate, while up to three-fold growth and nutrient uptake response to insects indicated that growth of natural populations might be severely limited by inadequate catches of prey. It is concluded that the highly nutrient-poor conditions typical of the habitat of pygmy species of Drosera may have promoted marked specialization towards carnivory and an attendant decline in ability to utilize soil-derived sources of nutrients.
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The utilization of nitrogen from insect capture by different growth forms of Drosera from Southwest Australia
Oecologia, 1991Co-Authors: Ernst Detlef Schulze, Gerhard Gebauer, Waltraud X. Schulze, John S. PateAbstract:Plants of Drosera species, neighbouring noncarnivorous plants, and arthropods on or near each Drosera sp. were collected at 11 contrasting habitat locations in SW Australia. At three of the sites clones of the rare glandless mutant form of D. erythrorhiza were collected alongside fully glandular counterparts. The δ 15N value (15N/14N natural isotope composition) of insect-free leaf and stem fractions was measured, and the data then used to estimate proportional dependence on insect N (%NdI) for the respective species and growth forms of Drosera. The data indicated lower %NdI values for rosette than for self-supporting erect or for climbing vine species. The latter two groups showed an average %NdI value close to 50%. The %NdI increased with length and biomass of climbing but not erect forms of Drosera. δ 15N values of stems were positively correlated with corresponding values for leaves of Drosera. Leaf material was on average significantly more 15N enriched than stems, possibly due to delayed transport of recent insect-derived N, or to discrimination against 15N in transfer from leaf to the rest of the plant. The comparison of δ 15N values of insects and arthropod prey, glandless and glandular plants of D. erythrorhiza indicated %NdI values of 14.3, 12.2 and 32.2 at the respective sites, while matching comparisons based on δ 15N of insect, reference plants and glandular plants proved less definitive, with only one site recording a positive %NdI (value of 10.4%) despite evidence at all sites of feeding on insects by the glandular plants. The use of the δ 15N technique for studying nutrition of carnivorous species and the ecological significance of insect feeding of different growth forms of Drosera growing in a large range of habitats is discussed.
