Table 1 Results of second-order polynomial regression for effects of Date (number of days since January 1), Date2 and Head width on the numbers of immature and immature egg loads in field-captured P. downsi females.

From: Persistence of the invasive bird-parasitic fly Philornis downsi over the host interbreeding period in the Galapagos Islands

Variable

Coefficient

Standard error

z

p

Mature eggs

Intercept

− 2.125

0.4525

− 4.696

< 0.0001

Date

− 5.613e−4

1.341e−3

− 0.415

0.678

Date2

2.736e−6

3.722e−6

0.735

0.462

Head width

1.519

0.1409

10.78

< 0.001

Immature eggs

Intercept

− 2.567

1.116

− 2.301

0.0214

Date

− 7.034e−2

4.336e−3

− 16.22

< 0.0001

Date2

1.847e−4

1.185e−5

15.593

< 0.0001

Head width

2.077

0.3435

6.048

< 0.0001

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