Table 2 Examples of the minimum number of individuals (trees) and software used in spatial point-pattern analyses. Most studies used a very low number of trees in SPPA which does not correspond to the recommendations provided by the main textbooks related to SPPA
Summary statistics | Number of individuals | Software | References |
|---|---|---|---|
K(r) and Moran’s correlograms L(r) and L12(r) g(r) and g12(r) | > 15 | Spatial Analysis (Duncan 1995) SPPA (Haase 2001) Programita (Wiegand and Moloney 2004) | Camarero et al. 2000 Lingua et al. 2008 Carrer et al. 2013 |
L(r) and L12(r) | ≥ 26 | ADE-4 (Thioulouse et al. 1997) | Camarero et al. 2005 |
kmm(r) | ≥ 100 | R (R Development Core Team) | Getzin et al. 2008a |
L(r) | ≥ 60 | SPPA (Haase 2004) | Szmyt 2010 |
g12(r) g(r) | ≥ 25 | Programita (Wiegand and Moloney 2004) R (R Development Core Team) | Petritan et al. 2015 Du et al. 2017 |
g(r) and g12(r) | ≥ 10 | R (R Development Core Team) | JanÃk et al. 2016 |
O12(r) | ≥ 4 | Programita (Wiegand and Moloney 2004) | Cordero et al. 2016 |
L12(r) L(r) and L12(r) g(r), kmm(r) and γ(r) g(r) and g12(r) | ≥ 20 | SPPA (Haase 2002) Not specified R (R Development Core Team) Programita (Wiegand and Moloney 2004) | Fajardo et al. 2006 Zenner and Peck 2009 Fibich et al. 2016 Ziegler et al. 2017 |
L12(r) and g12(r) | > 30 | Programita (Wiegand and Moloney 2004) | Muvengwi et al. 2018 |
g(r), g12(r) and g21(r) g(r) and g12(r) | ≥ 30 | Programita (Wiegand and Moloney 2014) R (R Development Core Team) | Nguyen et al. 2016 Li et al. 2020a |
g(r) g(r), kmm(r) and γ(r) | ≥ 40 | Programita (Wiegand and Moloney 2004, 2014) and R (R Development Core Team) R (R Development Core Team) | Yao et al. 2016; Das Gupta and Pinno 2018 Li et al. 2020b |
g(r) | ≥ 68 | R (R Development Core Team) | Carrer et al. 2018 |
g12(r), km. (r) | ≥ 50 | Programita (Wiegand and Moloney 2014) | Ribeiro et al. 2021 |