Table 4. Results of
zero-inflated GLMs conducted for the abundance of bumble bees (a),
syrphid flies (b), and non-syrphid flies (c).
(a) Bumble bee model |
|
|
|
|
Variable |
Coefficient |
SE |
z value |
p
value |
Conditional model |
|
|
|
|
Intercept |
-20.26 |
2.77 |
-7.3 |
<0.0001*** |
Day N |
0.19 |
0.027 |
7.4 |
<0.0001*** |
Day N2
|
-4.29 ×10-4
|
6.3
×10-5
|
-6.8 |
<0.0001*** |
Year (2018) |
-2.35 |
3.11 |
-0.75 |
0.45 |
Temperature |
0.037 |
0.008 |
4.6 |
<0.0001*** |
Relative humidity |
-0.0058 |
0.0019 |
-3 |
0.0025 ** |
Day N × Year (2018) |
0.043 |
0.030 |
1.5 |
0.15 |
Day N2 × Year (2018) |
-1.4 ×10-4
|
7.0 ×10-5
|
-1.8 |
0.059 |
Zero-inflate model |
|
|
|
|
Intercept |
-2.56 |
0.29 |
-8.8 |
<0.0001*** |
(b) Syrphid fly model |
|
|
|
|
Conditional model |
|
|
|
|
Intercept |
3.97 |
1.45 |
2.7 |
0.006 ** |
Day N |
0.032 |
0.015 |
2.2 |
0.027 * |
Day N2
|
-1.2 ×10-4
|
3.7
×10-5
|
-3.2 |
0.0013 ** |
Year (2018) |
10.38 |
1.74 |
6.0 |
<0.0001*** |
Temperature |
-0.057 |
0.0078 |
-7.3 |
<0.0001*** |
Relative humidity |
-0.036 |
0.0017 |
-21.3 |
<0.0001*** |
Day N × Year (2018) |
-0.12 |
0.018 |
-6.7 |
<0.0001*** |
Day N2 × Year (2018) |
3.5 ×10-4
|
4.4 ×10-5
|
7.8 |
<0.0001*** |
Zero-inflate model |
|
|
|
|
Intercept |
-3.67 |
0.47 |
-7.8 |
<0.0001*** |
(c) Non-syrphid fly model |
(c) Non-syrphid fly model |
|
|
|
Conditional model |
|
|
|
|
Intercept |
19.3 |
0.91 |
21.1 |
<0.0001*** |
Day N |
-0.16 |
0.0094 |
-16.7 |
<0.0001*** |
Day N2
|
3.8 ×10-4
|
2.4
×10-5
|
16.2 |
<0.0001*** |
Year (2018) |
4.62 |
1.38 |
3.4 |
0.0008*** |
Temperature |
0.0092 |
0.0056 |
1.6 |
0.10 |
Relative humidity |
-0.0092 |
0.0013 |
-7.3 |
<0.0001*** |
Day N × Year (2018) |
-0.068 |
0.014 |
-4.8 |
<0.0001*** |
Day N2 × Year (2018) |
2.2 ×10-4
|
3.5 ×10-5
|
6.2 |
<0.0001*** |
Zero-inflate model |
|
|
|
|
Intercept |
-5.3 |
1.00 |
-5.29 |
<0.0001*** |