Genetic relationships between Australian fireweed and South African and Madagascan populations of Senecio madagascariensis Poir. and closely related Senecio species

Radford, I. J.; Muller, P.J.; Fiffer, S.; Michael, P. W.

doi:10.1071/sb98029

Cited by 35 publications

(30 citation statements)

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“…Provenance has been further identified to KZN by morphological and isozyme data which included individuals sampled from the Western Cape, Eastern Cape and KZN provinces in South Africa, Swaziland and Madagascar [38]. We therefore concentrated our sampling on KZN (11 sites).…”

Section: Methodsmentioning

confidence: 99%

Genetic Bottlenecks in Time and Space: Reconstructing Invasions from Contemporary and Historical Collections

et al. 2014

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Herbarium accession data offer a useful historical botanical perspective and have been used to track the spread of plant invasions through time and space. Nevertheless, few studies have utilised this resource for genetic analysis to reconstruct a more complete picture of historical invasion dynamics, including the occurrence of separate introduction events. In this study, we combined nuclear and chloroplast microsatellite analyses of contemporary and historical collections of Senecio madagascariensis, a globally invasive weed first introduced to Australia c. 1918 from its native South Africa. Analysis of nuclear microsatellites, together with temporal spread data and simulations of herbarium voucher sampling, revealed distinct introductions to south-eastern Australia and mid-eastern Australia. Genetic diversity of the south-eastern invasive population was lower than in the native range, but higher than in the mid-eastern invasion. In the invasive range, despite its low resolution, our chloroplast microsatellite data revealed the occurrence of new haplotypes over time, probably as the result of subsequent introduction(s) to Australia from the native range during the latter half of the 20th century. Our work demonstrates how molecular studies of contemporary and historical field collections can be combined to reconstruct a more complete picture of the invasion history of introduced taxa. Further, our study indicates that a survey of contemporary samples only (as undertaken for the majority of invasive species studies) would be insufficient to identify potential source populations and occurrence of multiple introductions.

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Section: Methodsmentioning

confidence: 99%

Genetic Bottlenecks in Time and Space: Reconstructing Invasions from Contemporary and Historical Collections

et al. 2014

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“…Description of taxa S. madagascariensis (fireweed) and S. lautus (variable groundsel) are closely related annuals or short-lived perennial species from southern Africa and Australia respectively (Hilliard 1977;Michael 1981;Radford et al 1995Radford et al , 2000Scott et al 1998). These species were formally considered conspecific in Australia because of their almost identical appearance (Michael 1981).…”

Section: Methodsmentioning

confidence: 99%

Invasiveness and comparative life-history traits of exotic and indigenous Senecio species in Australia

2000

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A comparative ecological study of closely related invasive and non-invasive species, Senecio madagascariensis and S. lautus (Asteraceae), investigated what traits might confer invasive ability in very similar species. Life-history attributes of the weed S. madagascariensis were compared to five habitat-specific subspecies of S. lautus: S. l. alpinus, S. l. dissectifolius, S. l. lanceolatus and two forms of S. l. maritimus. Field populations of each taxon were monitored to compare their population ecology. Relative rates of phenological development were compared at a single location. Seed germination was studied in a laboratory experiment. Transplant experiments were conducted in a range of S. madagascariensis and S. lautus habitats to compare performance in different environments. In monitored field populations S. madagascariensis produced seedlings and reproductive cohorts more frequently, flowered for longer periods, produced more seeds and had fewer germinable achenes in the soil compared to S. lautus taxa. S. madagascariensis achenes had higher rates of germination than S. lautus in both light and dark conditions. S. madagascariensis was found to have higher rates of survival than S. lautus taxa in a range of habitats and to be faster to flower in both transplant and standard glasshouse environments. Overall S. madagascariensis performed better than S. lautus ecotypes in terms of seedling, growth and fecundity measurements and second best for achenes. Despite relatively good performance in terms of life-history traits there is no evidence that S. madagascariensis is invading S. lautus habitats. We speculate that physiological and morphological adaptations to specialised environments are a better explanation for success of Senecio taxa/ecotypes than generalised life-history trait performance. We suggest that invasiveness is essentially unpredictable, due to habitat/plant specific interactions between invader and area of introduction. In the absence of predictive theory, quarantine authorities should use a combination of methods to assess invasive potential including a database of known weeds, performance comparisons between congeneric natives and exotics in a range of habitats at proposed point of introduction and monitoring of introduced species to determine if they spread.

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“…It is evident based on the molecular analysis that the origins of invasive fireweed population in Australia (also Hawaii) are KwaZulu‐Natal, South Africa (Scott et al. 1998; Radford et al. 2000; Gardner et al.…”

Section: Resultsmentioning

confidence: 99%

“…It seemed that Japanese sites had hotter summers and colder winters than the Australian sites. It is evident based on the molecular analysis that the origins of invasive fireweed population in Australia (also Hawaii) are KwaZulu-Natal, South Africa (Scott et al 1998;Radford et al 2000;Gardner et al 2006;Le Roux et al 2006). On the other hand, Kinoshita et al (1999) presumed that fireweed population in Japan came from Kentucky with seeds for revegetation; however, the origins were unknown.…”

Section: Resultsmentioning

confidence: 99%

Current and potential distribution of Senecio madagascariensis Poir. (fireweed), an invasive alien plant in Japan

Tsutsumi

2011

Grassland Science

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The short‐lived perennial (sometimes annual) plant, Senecio madagascariensis Poir. (fireweed) is native to South Africa and Madagascar. This plant is an invasive weed becoming naturalized over a wide range of the world, and has caused agricultural damage mainly due to its toxicity to livestock. In Japan, fireweed was first found in 1976, and has been spreading throughout the country. In this study, the current distribution of fireweed in Japan was investigated. Using a maximum entropy ecological niche modeling algorithm, the relationship between the distribution records of fireweed and climatic variables was modeled, and the potential distribution of fireweed was predicted. Many growing sites of fireweed have been observed on the Pacific coast and Seto Inland Sea coast. The northern and southern ends of the current distribution were the Pacific coast of southern Tohoku (36.9172°N, 140.8613°E) and southern Kyushu (31.5654°N, 130.3438°E), respectively. The results of modeling showed that mean temperature in the warmest quarter was the most influential predictor, and suggested that geographical distribution of fireweed in Japan is restricted mainly by temperature, not by precipitation. The predicted areas of potential distribution were mainly on the Pacific coast and eastern Seto Inland Sea coast. Of the regions where fireweed had not been found, the following regions were predicted as potential distribution areas of fireweed: southern Kanto region along Tokyo Bay, coastal area of western Tokai region, western part of Seto Inland Sea coast and northern Kyushu. The Pacific coast of central Tohoku (39.058°N, 141.843°E) was predicted as the northern end of the potential distribution, and Amami‐oshima Island (28.304°N, 129.519°E) as the southern end.

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Genetic relationships between Australian fireweed and South African and Madagascan populations of Senecio madagascariensis Poir. and closely related Senecio species

Cited by 35 publications

References 0 publications

Genetic Bottlenecks in Time and Space: Reconstructing Invasions from Contemporary and Historical Collections

Genetic Bottlenecks in Time and Space: Reconstructing Invasions from Contemporary and Historical Collections

Invasiveness and comparative life-history traits of exotic and indigenous Senecio species in Australia

Current and potential distribution of Senecio madagascariensis Poir. (fireweed), an invasive alien plant in Japan

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