Ecological Archives E089-083-A1

Ingolf Steffan-Dewenter and Susanne Schiele. 2008. Do resources or natural enemies drive bee population dynamics in fragmented habitats? Ecology 89:1375–1387.

Appendix A (Table A1). Abundance and biotic interactions of Osmia rufa populations and percentage brood cells of O. rufa, other bees and wasps of total number of brood cells in trap nests from 1998–2003.

 

1998

1999

2000

2001

2002

2003 3

Number of nests

19.4±6.1
(0–159)

26.9±5.7
(0–127)

117.2±26
(0–708)

229.6±51.4
(1–903)

720.4±166
(4–3790)

18.5±2.9
(0–60)

Number of brood cells

78.6±20.3
(0–418)

126.6±22.3
(0–521)

518.5±110.7
(0–2909)

1009±225
(3–4356)

2741±627
(4–14734)

80.9±13.7
(0–283)

Brood cells per nest

4.74±0.29
(2.33–7.0)

5.28±0.17
(2.76–7.33)

4.31±0.18
(1.75–6.03)

4.22±0.12
(2.4–5.59)

3.77±0.14
(1.0–4.95)

4.53±0.31
(1.0–10.0)

Parasitism (%) 1

27.4±4.7
(0–80)

20.6±3.2
(0–53.2)

20.7±2.8
(2.8–52.1)

28.7±2.8
(4.1–58.1)

12.9±1.3
(2.9–25.8)

31.7±3.3
(6.6–64.7)

Larval mortality (%) 1

19.6±2.4
(0–52.9)

13.2±2.6
(0–54.5)

14.7±1.1
(3.8–28.3)

14.9±2.1
(4.1–58.3)

11.8±1.0
(1.4–21.9)

28.3±2.4
(7–57.5)

Pupal mortality (%) 1

27.9±4.8
(0–92.8)

8.8±3.7
(0–82.6)

8.9±1.2
(1.2–23.9)

5.4±2.1
(0–59.9)

-

-

Occupied reed stems (%) 2

1.22±0.5
(0–14.36)

1.46±0.3
(0–6.69)

6.01±1.22
(0–31.97)

10.11±2.15
(0.05–38.05)

25.91±4.99
(0.21–95.83)

0.98±0.16
(0–3.16)

O. rufa
(% brood cells)

35.8

52.7

69.4

78.7

84.8

21.7

Other bees
(% brood cells)

11.3

6.9

5.6

5.9

4.0

27

Wasps
(% brood cells)

52.9

40.4

25

15.4

11.2

51.3

   Notes: Means, standard error, and range (in brackets) are given; 1 For sites with >10 brood cells); 2 The proportion of exposed reed stems with a diameter between 5–9 mm that was occupied by O. rufa nests; 3 All brood cells from the previous year were not returned to the study sites.


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