Australian Journal of Botany (AUST J BOT)

Publisher: Commonwealth Scientific and Industrial Research Organization (Australia); Australian National Research Council; Australian Academy of Science, CSIRO Publishing

Journal description

The Australian Journal of Botany is an international journal for publication of original research in plant science. Work on all plant groups, including fossil plants, is published. The journal publishes in the areas of: ecology and ecophysiology; conservation biology and biodiversity; forest biology and management; cell and molecular biology; paleobotany; reproductive biology and genetics; mycology and pathology; and structure and development.

Current impact factor: 0.90

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 0.903
2012 Impact Factor 1.204
2011 Impact Factor 1.111
2010 Impact Factor 1.681
2009 Impact Factor 1.868
2008 Impact Factor 1.459
2007 Impact Factor 0.987
2006 Impact Factor 0.94
2005 Impact Factor 1.207
2004 Impact Factor 0.893
2003 Impact Factor 0.938
2002 Impact Factor 0.968
2001 Impact Factor 0.671
2000 Impact Factor 0.782
1999 Impact Factor 1.087
1998 Impact Factor 0.729
1997 Impact Factor 0.85
1996 Impact Factor 0.768
1995 Impact Factor 0.644
1994 Impact Factor 1.147
1993 Impact Factor 1.083
1992 Impact Factor 0.37

Impact factor over time

Impact factor
Year

Additional details

5-year impact 1.70
Cited half-life 0.00
Immediacy index 0.35
Eigenfactor 0.00
Article influence 0.54
Website Australian Journal of Botany website
Other titles Australian journal of botany, AJB
ISSN 0067-1924
OCLC 1518812
Material type Government publication, National government publication, Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

CSIRO Publishing

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • On author's personal repository or institutional repository
    • Must link to publisher version
    • Published source must be acknowledged
    • Publisher's version/PDF cannot be used
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: There is difficulty assigning maturity to non-arborescent (trunkless) cycad species and as a consequence in determining the mature/immature structure of threatened populations, which is important for their management. The aim of this investigation was to find a reliable and simple method to determine maturity for the threatened, non-arborescent cycad Macrozamia parcifolia P.I. Forst. & D.L. Jones and incorporate this information into a population structure. Measurements were taken from tagged plants on four quadrats in eucalypt dominated open forest in south-east Queensland, Australia. Using a single time point data set of three variables associated with the longest mature leaf basal petiole width coupled with several years of coning evidence was found best at distinguishing- mature plants. Choice of this variable and the threshold point to class non-coning plants as mature or immature was through a classification tree model using a binary recursive partitioning process, the tree pruned to identify the best variable and threshold point via a cross validation process. This simple, reliable method to determine maturity was still effective when using a single time point data set for coning evidence. The method can be applied to other threatened, non-arborescent cycads, which could aid in their conservation management. M. parcifolia population structure was bimodal. The mode that encompassed immature plants was broadly reverse J-shaped, indicating younger immature plants had highest mortality. Reasons for the bimodality are possibly complex, but could simply highlight a non-lineal relationship of basal petiole width with plant age.
    Australian Journal of Botany 01/2015; 63.
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    ABSTRACT: Compared to serpentine floras of southeast Asia, Sri Lanka’s serpentine vegetation is impoverished with regards to serpentine endemics and nickel hyperaccumulators. All species so far documented from Sri Lanka’s serpentine outcrops also have non-serpentine populations; it is unclear if the serpentine populations are physiologically distinct and deserve ecotypic recognition. We conducted a preliminary study to examine if serpentine and non-serpentine populations of Fimbristylis ovata represent locally-adapted ecotypes by investigating their growth and potential for nickel uptake and tolerance under greenhouse conditions. Although both populations of F. ovata showed a similar growth pattern in serpentine soil during short-term exposure (21 days), the non-serpentine population was unable to survive in serpentine soil under long-term exposure (four months). Both populations were able to uptake nickel from serpentine soil during short-term exposure (21 days). The serpentine population, however, translocated significantly more nickel from its roots to shoots (translocation factor 0.43) than the non-serpentine population (translocation factor 0.29). Our preliminary investigations suggest that the serpentine and non-serpentine populations of F. ovata may be locally-adapted to their respective soils. However, additional studies are required to determine if the populations deserve ecotypic recognition.
    Australian Journal of Botany 01/2015;
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    ABSTRACT: This study was conducted to understand the role of bacterial-fungal interactions on heavy metal uptake by Zea mays plants. A pot experiment was conducted for 90 days with Z. mays in serpentine soil inoculated with a Gram-negative bacterium, fungus (Aspergilllus sp.) and both microbes to determine the effects of inoculation on nickel, manganese, chromium and cobalt concentrations in plant tissue and soil. Soil nutrients and soil enzyme activities were measured to determine the effect of inoculations in soil quality. Inoculation of microorganisms increased shoot and root biomass, and the maximum biomass was in the bacterial-fungal inoculation. This could be due to the solubilization of phosphate and production of Indole Acetic Acid. Although the combination treatment contributed to an increase in heavy metal uptake in Z. mays plants, the lowest translocation was observed in the combination treatment. Moreover the soil available nitrogen, available phosphorous and total organic carbon content were increased with the microbial inoculation. Similarly, the soil dehydrogenase activity was higher as a result of microbial inoculation, whereas the highest dehydrogenase activity was reported in the combination inoculation. This study indicates the synergistic effect of bacterial-fungal inoculation as a soil quality enhancer and as a plant growth promoter in the presence of heavy metals.
    Australian Journal of Botany 01/2015;
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    ABSTRACT: In Press
    Australian Journal of Botany 01/2015;
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    ABSTRACT: The objective of this work was to analyze the vegetation dynamics of a xeric serpentine savanna located in the Mid-Atlantic, USA. We employed vegetation surveys of thirty-two, 10 x 15 m quadrats to obtain woody species composition, density, basal area, and developed a spatial physiochemical dataset of substrate geochemistry to independently summarize the data using regression and ordination techniques. This information was interpreted alongside historical, dendrochronologic and soil stable carbon isotopic data to evaluate successional dynamics. Comparisons among geologic, pedologic, and vegetation environmental drivers indicate broad correlations across an environmental gradient corresponding to a grassland to forest transition. The woodland communities appear to be part of a complex soil moisture/chemistry gradient that affects the extent, density, basal area, and species composition of these communities. Over the gradient there is an increase in alpha diversity, a decrease in the density of xeric and invasive species, and an increase in stem density of more mesic species. Dendrochronology suggests poor recruitment of xeric species and concomitant increase in more mesic species. The data indicate that former C4 dominated grasslands were initially invaded by conifers and are now experiencing mesophication with growing dominance by Acer, Nyssa, and more mesic Quercus and Fagus species.
    Australian Journal of Botany 01/2015;
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    ABSTRACT: Plants endemic to serpentine soils are adapted to harsh environmental conditions typical of those soils, particularly relatively low (<1) Ca:Mg ratios. We compared survival of two perennial Alyssum species native to Iran under experimental manipulations of Ca:Mg ratio, including when Ca:Mg ratio was varied under conditions of high ammonium concentration and heat stress. Alyssum inflatum is a serpentine endemic capable of Ni hyperaccumulation while A. lanceolatum is found on non-serpentine soils and is not known to hyperaccumulate Ni. We grew plants of both species under four Ca:Mg ratios (0.4, 2, 20, 40) and tested survival when plants were exposed to elevated ammonium levels (0, 1, and 4 mM) and heat stress (control conditions vs. a 5-hr 36 °C treatment daily for 5 days). Alyssum lanceolatum was more tolerant of Ca:Mg ratio variation (100% survival in all treatments) whereas A. inflatum survival was maximum at Ca:Mg=2, reduced at Ca:Mg=0.4, and very low for Ca:Mg ratios of 20 and 40. Alyssum lanceolatum also tolerated ammonium and heat stress, whereas survival of A. inflatum declined at higher Ca:Mg ratios when subjected to both stresses. We conclude that at higher Ca:Mg ratios the serpentine endemic has reduced tolerance for these environmental stresses and may be more susceptible to human-driven climate change-associated stressors than the non-serpentine species.
    Australian Journal of Botany 01/2015;
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    ABSTRACT: Despite a large body of work on the serpentine-substrate effect on vascular plants, little work has been undertaken to describe algal communities found on serpentine soils derived from peridotite and other ultramafic rocks. We report a preliminary study describing the occurrence of algae and cyanoprokaryotes on mafic and ultramafic substrates from South Africa. Results suggest that slope and aspect play a key role in species diversity and community composition and, although low pH, nutrients and metal content do not reduce species richness, these edaphic features influence species composition. Further, typical soil genera such as Leptolyngbya, Microcoleus, Phormidium, Chlamydomonas, Chlorococcum and Hantzchia were found at most sites. Chroococcus sp., Scytonema ocellatum, Nostoc linckia, Chlorotetraedron sp., Hormotilopsis gelatinosa, Klebsormidium flaccidium, Pleurococcus sp. and Tetracystis elliptica were unique to one serpentine site. The preliminary survey provides directions for future research on the serpentine-substrate effect on algal and cyanoprokaryote diversity in South Africa.
    Australian Journal of Botany 01/2015;
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    ABSTRACT: Herbarium specimens and contemporary collections were used to investigate the effects of environment and CO2 concentration on stomatal density, stomatal size, maximum potential water loss through stomata (gwmax) and leaf width of Melaleuca lanceolata Otto in southern Australia. Variation in CO2 had no effect on stomatal size and density, or gwmax of M. lanceolata. In contrast, stomatal density was negatively correlated with annual rainfall and there were significant, positive relationships between both elevation and mean maximum temperature and stomatal density. There was also a positive relationship between gwmax and maximum temperature. Leaf width was negatively correlated with both maximum temperature and elevation. We suggest that the increase in stomatal density and gwmax with increasing maximum temperatures enhances the potential for evaporative cooling of M. lanceolata leaves. It could also allow plants to maximise opportunities for carbon fixation during the sporadic rainfall events that are typical of drier, northern regions. This occurs in conjunction with a narrowing of the leaves in warmer climates and higher elevations, which results in a decrease in the thickness of the boundary layer. This combination of smaller leaves and increased potential for evaporative cooling through increased stomatal density and gwmax would allow the leaf to stay closer to its optimal temperature for photosynthesis.
    Australian Journal of Botany 01/2015;
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    ABSTRACT: Freshwater temporary wetlands are a little-studied ecosystem world-wide. They have been recognised as critically endangered in south east Australia under Australian biodiversity conservation legislation. However, little has been recorded about their hydrology, functioning or biodiversity values; i.e. the factors that make them intrinsically ‘swampy’. In this paper we develop a simple threshold model of wetland hydrology based on historical rainfall records and calculated evaporation records matched to records and recollections of the owners of swamps, and document water plant and microalgal species richness. The model indicates that swamps were inundated to at least 10 cm depth in an average of 6.3 years per decade for most of the 20th century. The average dry time between inundations was 1.27 years (maximum of 4.5 years). Since 1998 the frequency of inundation appears to have decreased, and the average dry times have increased. Despite, or because of, their temporary nature, these swamps have high biodiversity values among the vegetation and the microalgae, more than has been recorded for near-by permanent wetlands. There is no evidence that a drier and warmer climate will impact negatively on biodiversity values, however land management is likely to be important for maintaining these systems as the climate changes.
    Australian Journal of Botany 12/2014; 62:469-480. DOI:10.1071/BT14119
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    ABSTRACT: The carnivorous plant genus Utricularia comprises three monophyletic subgenera, Polypompholyx, Bivalvaria, and Utricularia; however, all Utricularia species produce sophisticated suction traps. Most studies on the interactions between this genus and algae were performed on the derived aquatic bladderworts from Utricularia subgenus Utricularia, section Utricularia, thus our knowledge about phytotelmata in bladderworts is still limited. The main aim of our study was to examine the composition of algae and prey in phytotelmata of Utricularia volubilis R.Br., the Australian species from subgenus Polypompholyx, that has different construction of the trap door and trigger mechanism than species studied so far within the context of trapped organisms. We examined the contents of traps collected at a natural site in Western Australia, and from cultivated material grown in a botanical garden. The traps from the natural site in Australia contained predominantly diatoms, mainly of the genus Frustulia. Young traps from the botanical garden contained mainly diatoms, xanthophytes and green algae, while in the older traps, cyanobacteria prevailed. In general these observations were in agreement with the data obtained for aquatic bladderworts from section Utricularia, thus suggesting that the type of trigger mechanism has a minor influence on the composition of the trapped algae and prey.
    Australian Journal of Botany 10/2014; DOI:10.1071/BT14176
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    ABSTRACT: There have been significant increases in the richness of exotic vascular plant species over the past century on Moreton Island, Australia. In total, 120 exotic species (including eight declared plants) in 90 genera and 42 families were collected and collated through field surveys during 2008–2010 and from the Queensland Herbarium collections. One-hundred years ago, no exotic vascular plant species were recorded. Sixteen years later, 14 exotic species in 14 genera from 11 families were collected. A half century later (1973–1975), a detailed vegetation survey recorded 66 exotic species (including five declared plants) belonging to 57 genera from 30 families. This increase coincides with a history of increasingly frequent wild fires, increasing human activities and greater presence of feral animals. The most significant increase occurred after the 1973–1975 surveys, namely an increase of 54 more species, equivalent to an 81.8% increase. These latter species included 17 (31.5%) woody species, 11 (20.4%) graminoid species and 26 (48.1%) forb species. The Sorensen similarity index (ISS) of total exotic species between the surveys of 1973–1975 and 2008–2010 was intermediate (ISS = 0.62). Index for woody species (ISS = 0.60) was also intermediate. Indices for annual graminoids (ISS = 0.53) and perennial forbs (ISS = 0.40) were all relatively low between the studies. Perennial graminoids and annual forbs had high similarity indices, namely, 0.75 and 0.72, respectively. The invasiveness of these plants was also assessed and it was shown that the ‘highly invasive’ and ‘generally invasive’ species were relatively few in number. The findings highlight the rapid increase and change in exotic vascular plant species on Moreton Island and the need for a more robust understanding of the exotic species’ dynamics of the island in order to inform weed management and native vegetation protection services.
    Australian Journal of Botany 09/2014; 62(5):379-390.