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Patterns in Vascular Plant Species Density in Tall Alpine Herbfield Along an Increasing Altitudinal Gradient in an Australian Alpine Region

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Patterns in Vascular Plant Species Density in Tall Alpine Herbfield Along an Increasing Altitudinal Gradient in an Australian Alpine Region Patterns in vascular plant species density in tall alpine herbfield along an increasing altitudinal gradient in an Australian alpine region Author Pickering, Catherine M, Butler, Sarah Published 2009 Journal Title Australian Journal of Botany DOI https://doi.org/10.1071/BT08202 Copyright Statement © 2009 CSIRO. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version. Downloaded from http://hdl.handle.net/10072/29655 Link to published version http://www.publish.csiro.au/nid/65.htm Griffith Research Online https://research-repository.griffith.edu.au Patterns in vascular plant species density in tall alpine herbfield along an increasing altitudinal gradient in the Australian alpine region CM PickeringAB and S ButlerA, A School of Environment, Gold Coast campus, Griffith University, QLD, 4222 AUSTRALIA B E-mail: [email protected] Ph: + 61 (0) 7 5552 8059, Fax: + 61 (0) 7 5552 8067 Keywords species richness; altitude gradient; endemics; weeds; alpha diversity Abstract. Patterns in species density and richness per altitudinal interval have been found when sampling across plant community boundaries, including in the largest contiguous alpine area in Australia. To see if similar patterns occur within a single community, vascular plant composition was systematically sampled with replicate nested quadrats of increasing size (0.01, 0.06, 0.25, 1.00, 4.00, 25.00, 49.00 and 100- m2 size) sampled from ~1850 to 2100 m altitude in tall alpine herbfield, Australia. The only significant relationships with altitude were quadratic relationships for the density of herb and graminoid species, with peak density at mid-altitudes and a linear decline in total species richness with altitude for 0.06 m2 quadrats. The composition of 100 m2 quadrats was unrelated to altitude when tested using Analysis of Similarity for total composition, whereas the relationship was significant for growth-forms and the origin (local endemics, Australia endemics and weeds) of species. Location data from this, and 11 other studies were used to compare the species richness of more of the flora (183 species) using 50-m altitudinal bands. There were significant quadratic relationships for total species richness and the number of herb and shrub species with a peak in richness around 2000 m. Therefore altitude does affect species richness overall in this alpine region, but only has a weak effect on species density within the most common plant community. Introduction Change in species richness with altitude has been found in many high altitude regions around the world. It has been found to apply at a range of spatial scales including for whole floras, across different elevation zones (subalpine, alpine and nival), for elevation bands (Odland and Birks 1999; Austrheim 2002; Bhattarai and Vetaas 2003) and for plots of a fixed scale (species-density, Sklenar and Ramsay 2001; Austrheim 2002; Bhattarai and Vetaas 2003; Grytnes 2003). It has been found to occur for all species (Grabherr et al. 1994; Austrheim 2002; Bhattarai and Vetaas 2003; Grytnes 2003), for native flora (Mallen-Cooper and Pickering 2008a, 2008b; Pickering et al. 2008) and for weeds (Bhattarai and Vetaas 2003; Mallen-Cooper and Pickering 2008a, 2008b). Where species richness has varied systematically with elevation, it has usually been in the form of a monotonical decline with altitude (Rahbek 1995, 2005; Grabherr et al. 1994; Körner 2003; Nagy et al. 2003; Nogues-Bravo et al. 2008), or more commonly as a humped relationship where species richness peaks at mid-elevations (Rahbek 1995, 2005; Lomolino 2001; Sklenar and Ramsay 2001; Holton 2003; Nogues-Bravo et al. 2008). In alpine regions, a linear decline in vascular plant species richness measured both cumulatively and in 100-m altitude bands has been found in a range of different mountain systems (Grabherr et al. 1994; Austrheim 2002; Körner 2003; Nagy et al. 2003). Humped patterns have also been recorded, particularly where sampling included lower altitude sites (Odland and Birks 1999; Bhattarai and Vetaas 2003). Some studies have examined species density (number of species for plots of fixed size) in mountain regions. These studies have found linear (Nagy et al. 2003; Grytnes 2003; Mallen-Cooper and Pickering 2008a,b) or humped relationship (Sklenar and Ramsay 2001; Austrheim 2002; Bhattarai and Vetaas 2003; Grytnes 2003; Grytnes et al. 2008). Pattern in species richness measured either for altitudinal intervals or species density with altitude are attributed to a range of factors acting independently or in concert (Nogues-Bravo et al. 2008). Altitudinal gradients are surrogates for changes in a range of factors that can affect species density (Grytnes 2003; Kessler 2009). With increasing altitude there is often a change in total land area, environmental stress including climatic factors such as temperature, duration of snow cover etc, disturbance, competition, and historical and evolutionary factors associated with isolation (Rahbek 1995; Lomolino 2001; Körner 2002, 2003; Bhattarai and Vetaas 2003; Grytnes 2003; Kessler 2009). Where there are transitions between different plant communities, including between such clear zones as montane to subalpine and subalpine to alpine there may be peaks in species density as species characteristic of the different communities may co-occur in the transition zone (Lomolino 2001; Grytnes et al. 2008). Where sampling extends from alpine into nival zones, there can be linear declines in species richness due to declines in the density of plants in the transition zone between alpine and nival areas (Grabherr et al. 1994; Körner 2003). If variation in land area among elevation bands is contributing to patterns in species richness the pattern should apply to total richness per altitude interval for different species groups but not necessarily to species-density at a more local scale (Lomolino 2001; Grytnes 2003). Variations in climate, soils and disturbance over an elevation gradient can affect species density at a local scale, and are hard to tease apart (Lomolino 2001; Sklenar and Ramsay 2001; Austrheim 2002; Grytnes 2003). These factors may result in declines, or humped relationships depending on the elevation pattern in these potential sources of ‘environmental stress’ and the life form of the plants (Lomolino 2001; Bhattarai and Vetaas 2003). Speciation, dispersal and extinction can also affect species density. Dispersal limitation and source-sink effects can result in humped or linear relationships where mid-elevations receive propagules from species growing at higher and lower elevations, while those near the top of mountains may receive propagules from lower altitudes but not higher (Grytnes et al. 2008; Kessler 2009). As a result the diversity of weeds and other lowland species may decrease with increasing elevation; while there can be a concomitant increase in endemic species (Lomolino 2001; Austrheim 2002). As part of a process of examining patterns of species richness over elevational gradients, we wanted to determine whether there was a pattern in species density within a singe plant community, compared to among plant communities as is more commonly examined. Therefore we looked at elevation patterns in the most common vegetation community in the largest contiguous alpine region (~100 km2), with the largest altitudinal range (1850 to 2228 m), in Australia: tall alpine herbfields in the Kosciuszko alpine area in south-eastern Australia. To address issues associated with sampling artefacts, vascular plant species density and composition was assessed using a spatially and temporally standardised and systemic protocol (Rahbek 1995; Lomolino 2001; Bhattarai and Vetaas 2003; Grytnes 2003). Species density and composition was sampled at a range of spatial scales (0.1- m2 to 100-m2 quadrats). We sampled over a 250-m altitudinal range, nearly the entire elevational gradient of this community. We tested if any pattern found with altitude applied to the different spatial scales tested, to all species, to different growth-forms (herbs, graminoids and shrubs) and to species with different origins (local endemics, Australia endemics and weeds). We hypothesised that species richness would decrease with altitude, as has been found in studies in the same region that sampled species richness across plant community boundaries (McDougall et al. 2005; Mallen- Cooper and Pickering 2008a, 2008b; Pickering et al. 2008). We also hypothesised that any pattern found would vary with the growth-form and origin of species, with weeds being more common at lower altitude, and local endemics more common at higher altitudes. To test whether species richness of a larger range of species from this alpine region also varied with altitude, information on the location of individual species in Kosciuszko alpine area from this and eleven other studies was converted into species richness estimates per elevational band and analysed. Materials and Methods Study site The alpine region around Mt Kosciuszko (~100 km2) in the Snowy Mountains is part of the Australian Alps, the highest peaks in continental Australia that occur in south- eastern Australia. The alpine area around Mt Kosciuszko extends from the natural climatic tree-line at approximately 1850 m to the top of Mt Kosciuszko, continental Australia’s highest mountain, at 2228 m (Costin et al. 2000). Biologically this area is diverse containing
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