Ecological Archives M072-001-A6

Peter B. Pearman. 2002. The scale of community structure: habitat variation and avian guilds in tropical forest understory. Ecological Monographs 72:19-39.

Appendix F. Regression of species richness on percent primary forest within the specified radius, for 11 groups in samples taken at 8 test sites. P is the probability of Type I error associated with a given regression. P values appear in parentheses beneath the r-square values.

 
Guild
FIM radius

Shrub-layer

ant-followers

(s-li-r)

Shrub-layer

foliage-gleaners

(s-si-f)

Shrub-layer

omnivores

(s-so-f)

Sub-canopy

insectivore

(u-si-f)

Sub-canopy

pickers of

dead foliage

(u-li-d)

Mixed-species

flockers

(mxdflk)

Shrub-layer

nectarivores

(s-ni-f)

Shrub-layer

frugivores

(s-fr-f)

Ground

species

(all)

Shrub

species

(all)

Sub-canopy

species

(all)

Non-species (all)
35 m

0.14

(0.35)

0.22

(0.24)

0.00

(0.96)

0.00

(0.95)

0.00

(0.91)

0.63

(0.02)

0.00

(0.89)

0.18

(0.29)

0.02

(0.69)

0.11

(0.41

0.09

(0.45)

0.19

(0.27)

50 m

0.25

(0.20)

0.28

(0.18)

0.02

(0.69)

0.00

(0.90)

0.01

(0.84)

0.72

(0.01)

0.01

(0.80)

0.32

(0.14)

0.07

(0.52)

0.19

(0.27)

0.02

(0.73)

0.28

(0.17)

100 m

0.31

(0.14)

0.36

(0.11)

0.11

(0.42)

0.02

(0.74)

0.00

(0.83)

0.68

(0.012)

0.04

(0.62)

0.48

(0.06)

0.10

(0.45)

0.27

(0.18)

0.01

(0.84)

0.34

(0.12)

200 m

0.42

(0.07)

0.41

(0.09)

0.20

(0.27)

0.00

(0.95)

0.00

(0.95)

0.80

(0.003)

0.11

(0.43)

0.56

(0.03)

0.11

(0.40)

0.34

(0.13)

0.00

(0.88)

0.42

(0.08)

300 m

0.65

(0.02)

0.39

(0.10)

0.34

(0.13)

0.06

(0.55)

0.01

(0.79)

0.68

(0.01)

0.00

(0.90)

0.51

(0.05)

0.39

(0.09)

0.54

(0.04)

0.03

(0.69)

0.68

(0.01)

400 m

0.73

(0.007)

0.32

(0.14)

0.39

(0.10)

0.15

(0.34)

0.01

(0.80)

0.59

(0.025)

0.00

(0.88)

0.45

(0.07)

0.47

(0.06)

0.58

(0.03)

0.04

(0.65)

0.74

(0.01)

500 m

0.76

(0.004)

0.33

(0.14)

0.42

(0.08)

0.18

(0.29)

0.04

(0.63)

0.56

(0.03)

0.00

(0.87)

0.37

(0.11)

0.50

(0.05)

0.61

(0.02)

0.06

(0.55)

0.75

(0.005)

600 m

0.79

(0.003)

0.32

(0.14)

0.42

(0.08)

0.25

(0.21)

0.07

(0.51)

0.57

(0.03)

0.00

(0.87)

0.28

(0.18)

0.43

(0.08)

0.63

(0.02)

0.11

(0.40)

0.74

(0.006)

700 m

0.73

(0.007)

0.30

(0.16)

0.39

(0.10)

0.29

(0.17)

0.16

(0.32)

0.48

(0.06)

0.00

(0.88)

0.16

(0.32)

0.39

(0.10)

0.58

(0.03)

0.20

(0.27)

0.67

(0.01)

800 m

0.60

(0.02)

0.30

(0.17)

0.34

(0.13)

0.26

(0.20)

0.31

(0.15)

0.36

(0.12)

0.00

(0.98)

0.08

(0.51)

0.31

(0.15)

0.52

(0.04)

0.28

(0.17)

0.56

(0.03)

1000 m

0.39

(0.10)

0.23

(0.22)

0.23

(0.23)

0.22

(0.25)

0.49

(0.05)

0.17

(0.31)

0.00

(0.95)

0.01

(0.86)

0.27

(0.19)

0.37

(0.10)

0.34

(0.12)

0.40

(0.09)

2000 m

0.31

(0.15)

0.24

(0.22)

0.29

(0.17)

0.19

(0.28)

0.54

(0.04)

0.07

(0.52)

0.00

(0.96)

0.02

(0.72)

0.38

0.10)

0.35

(0.12)

0.30

(0.16)

0.41

(0.09)

Number sites occupied 4 7 6 2 2 5 8 7 5 8 5 8

   Notes: The percentage primary forest was determined within a distance shown by 'Radius', the radius of the FIM.  No evidence of a linear relationship was expected for subcanopy insectivores (u-si-f) and shrub-layer nectarivores (s-ni-f) and none is in evidence here.  The ant-followers, shrub-layer insectivores, shrub-layer omnivores, mixed-species flockers, the collective ground and shrub species, and all species not in canopy guilds showed a significant relationship or strong trend between species richness and forest cover measured at radii somewhere between 200 m and 500 m.  The subcanopy species together showed no evidence of a positive relationship between species richness and forest cover, an unexpected result. 



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