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Shackleton, Charlie M.

doi:10.1023/a:1014795505362

Cited by 35 publications

(5 citation statements)

References 25 publications

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“…The data for all saplings were measured and interpreted due to the importance of small saplings in the intraspecific competition (Shackleton, 2002). Taurus cedar all saplings (hereafter: AS) of each plot were divided into two size classes based on mean stand height of that plot (Table 1), by classifying saplings with heights above mean stand height as tall saplings (hereafter: TS) and those with heights below the mean stand height as short saplings (hereafter: SS), to better describe the stands' structure and to explain interactions.…”

Section: Discussionmentioning

confidence: 99%

Scale‐dependent intraspecific competition of Taurus cedar (Cedrus libani A. Rich.) saplings in the Southern Turkey

Yilmaz

Kavgacı

Sevgi

et al. 2019

Ecology and Evolution

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Better understanding of the competitive interaction at the early development stages of the stand is crucial to help schedule silvicultural treatments for young stands and for the better management of the future stands. We used scale‐dependent analysis to improve our understanding of sapling dynamics in the pure Taurus cedar (Cedrus libani A. Rich.) stands in Southern Turkey. Using data from nine plots established at the western Taurus Mountains, diameter, height, and crown radii of saplings were compared, and spatial point pattern analyses were performed. We found significant differences for the mean diameter and height, and crown radii of saplings among the plots. Univariate pair correlation function showed that sapling pattern was regular only at small scales (r < 0.4 m) but was predominantly random. Bivariate pair correlation function revealed no evidence of spatial interaction between tall saplings and short saplings. Univariate mark correlation function revealed that strong intraspecific competition was detected at small scales (up to 0.55 m). This distance is reasonable for the juvenile age tending of Taurus cedar saplings and should be under consideration during silvicultural treatments to use the site productivity more efficiently.

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Section: Discussionmentioning

confidence: 99%

Scale‐dependent intraspecific competition of Taurus cedar (Cedrus libani A. Rich.) saplings in the Southern Turkey

Yilmaz

Kavgacı

Sevgi

et al. 2019

Ecology and Evolution

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“…, where c is the number of concordant pairs, d is the number of discordant pairs and n is the number of total observations (Bolboaca and Jäntschi, 2006). However, because in reality the nearest neighbour is not necessarily the only or the most important competitor, we used the sum of the sizes and the sum of the distances to the four nearest neighbours (Shackleton, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Competition is the negative influence on a tree exerted by one or several neighbouring trees (Fowler, 1986). At this, the weaker competitor is usually smaller in size or not able to establish or survive (Pielou, 1962;Shackleton, 2002). The latter can be the result of 'density-dependent mortality'.…”

Section: Introductionmentioning

confidence: 99%

Density-dependent spatial patterning of woody plants differs between a semi-arid and a mesic savanna in South Africa

Hesselbarth

Wiegand

Dreber

et al. 2018

Journal of Arid Environments

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“…Semiarid savanna vegetation dynamics are primarily driven by competition for soil moisture derived from rare but critical precipitation events (Ward 2005;Wiegand et al 2005;Meyer et al 2009). Rates of growth and the maximal stem heights achievable by savanna trees in semi-arid ecosystems are strongly influenced by moisture and nutrient availability (Shackleton 1997;Sankaran et al 2008). Shackleton (2002) found that intraspecific competition, mostly within Acacia species, was more common than interspecific interactions (see also Smith and Grant 1986;Wiegand et al 2006;Meyer et al 2007;Moustakas et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The presence/absence of competition between woody plant species is inferred from the spatial distribution of individuals and is associated with a reduction in size of one or both neighbours (Bonan 1991;Shackleton 2002;Meyer et al 2007). Individual plants within a community may exploit distinct regions for resources delineated by the vertical and lateral extent of their roots (Walter 1971).…”

Section: Introductionmentioning

confidence: 99%

Intraspecific competition between shrubs in a semi-arid savanna

2010

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Tree-on-tree competitive interactions may be more important in affecting the distribution of the tree components of savannas than inter-specific competition with grasses. The presence of intraspecific competition is expected to negatively affect inter-tree spacing, individual size distributions and plant physiology as well as survival/mortality. In this field removal experiment on Acacia mellifera, one of South Africa's most common encroachers on nutrient-poor soils, the growth, water relations and mortalities of shrubs where all neighbouring woody competitors were removed (target) were monitored three times during each of three growing seasons. After 3 years, the nitrogen and carbon isotopic ratios of the study plants were analysed. Target shrubs benefitted from removal of neighbours, resulting in greater growth, less water stress, a relatively small degree of canopy dieback and reduced reliance on N 2 fixation. Target shrubs grew by 25 ± 4% in height relative to 7 ± 4% for controls, with the targets suffering a maximum of \15% canopy dieback compared to up to 60% in the controls. Severe environmental stress is known to affect neighbour interactions among shrubs and competition may constrain shrub sizes and avoid density-dependent mortality. In contrast, release from competition in our study may have allowed greater growth of target plants, increasing their total evapo-transpirational leaf surface areas and leaving them vulnerable to drought and water stress. Intratree competition on shallow nutrient-poor soils in savannas may thus aid the persistence of bush encroachment by regulating the sizes of individual shrubs below the threshold of drought vulnerability.

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Cited by 35 publications

References 25 publications

Scale‐dependent intraspecific competition of Taurus cedar (Cedrus libani A. Rich.) saplings in the Southern Turkey

Scale‐dependent intraspecific competition of Taurus cedar (Cedrus libani A. Rich.) saplings in the Southern Turkey

Density-dependent spatial patterning of woody plants differs between a semi-arid and a mesic savanna in South Africa

Intraspecific competition between shrubs in a semi-arid savanna

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