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APPENDIX G


Estimated value of the main species level descriptors for the eight study sites.





island

Santa Cruz

San Cristóbal




habitat

dry

humid

dry

humid




invasion

native

invaded

native

invaded

native

invaded

native

invaded

Strength

Native spp.

0.308

0.440

1.621

5.459

0.326

0.336

1.385

1.188

Alien spp.

0.022

0.058

0.095

0.714

0.274

0.571

1.137

0.849

Linkage level

Native spp.

1.737

1.684

2.400

7.000

1.471

1.667

2.333

2.500

Alien spp.

1.000

1.167

1.000

1.000

1.800

2.250

3.000

2.500

Specialization

Native spp.

0.213

0.204

0.387

0.319

0.323

0.259

0.530

0.079

Alien spp.

0.026

0.135

0.228

0.783

0.258

0.307

0.245

0.461


APPENDIX H


Relative bird abundance at the eight study sites expressed in terms of the number of captures per species.

island

Santa Cruz

San Cristóbal




habitat

dry

humid

dry

humid




invasion

native

invaded

native

invaded

native

invaded

native

invaded

total

Camarhynchus pallidus







4

6

14

11

4

11

50

Camarhynchus parvulus

34

34

19

11

20

30

8

26

182

Camarhynchus psittacula







1







1







2

Certhidea fusca













7

12

21

27

67

Certhidea olivacea







14

11













25

Coccyzus melacoryphus










3










1

4

Crotophaga ani




3

1

3




1

3

1

12

Dendroica petechia

25

44

77

29

102

41

65

61

444

Geospiza fortis

59

111

14

20

40

53

3

3

303

Geospiza fuliginosa

74

88

90

25

188

160

102

168

895

Geospiza magnirostris

22

16

2




6

7







53

Geospiza scandens

35

26



















61

Laterallus spilonotus







1
















1

Mimus melanotis













30

11




2

43

Mimus parvulus

39

34



















73

Myiarchus magnirostris

28

26

21

21

33

27

12

7

175

Platyspiza crassirostris

30

26

3

1













60

Zenaida galapagoensis




1



















1

Total

346

409

247

130

440

354

218

307

2451


Appendix I


Two-way contingency table used in partial and overall chi-square tests. Values are numbers of plant species with dry and fleshy fruits of which intact seeds have been found in the droppings of dispersers of each type, i.e. observed interactions. In parenthesis is the number of expected interactions, assuming no assortative linkage between disperser guild and fruit type. Individual chi-square tests indicate the significance of the selectivity of each disperser group for fruit type, applying the Yates continuity correction.


 

 

52 plant species










 

 

28 dry-fruited

24 fleshy-fruited

χ2

d.f.

P

18 seed disperser species

10 finches

17 (11.3)

4 (9.7)

6.21

1

0.013

5 other birds

6 (12.9)

18 (11.1)

8.04

1

0.005

3 reptiles

13 (18.8)

22 (16.2)

3.93

1

0.047

Overall test










18.17

2

0.0001


Appendix J


Diagram representing the two main dispersal routes used by dry- and fleshy-fruited plants (grey and red circles, respectively) into a site near the Charles Darwin Research Station in the dry zone of Santa Cruz. Triangles represent disperser species. Invasion routes followed by alien plants are highlighted with a bold red contour.


L. camara




T. paniculatum
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