Dear list members,
I want to analyse the impact of a competitor community (i.e. "community
abundances" on the one hand and "community species diversity" on the other
hand) on mosquito larval populations of species A and B. Each variable on its
own has a negative impact on mosquitoes - but when both variables are
interacting, there is a positive impact... How can I interpret that? For
mosquito A only C.diversity has a significant impact - but the interaction
between C.abundances and C.diversity is significant? What does that mean?
I used the model:
lm (mosquito ~ C.abundances * C.diversity)
output Mosquito A:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -0.2120 0.1159 -1.829 0.074855 .
C.abundances -0.1277 0.1616 -0.790 0.434067
C.diversity -0.5787 0.1385 -4.178 0.000155 ***
C.abundances:C.diversity 0.4096 0.1712 2.393 0.021476 *
Output Mosquito B:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -0.2900 0.1220 -2.377 0.02233 *
C.abundances -0.3856 0.1701 -2.266 0.02891 *
C.diversity -0.3470 0.1458 -2.381 0.02213 *
C.abundances:C.diversity 0.5367 0.1801 2.980 0.00489 **
Thanks a lot for your help!
Iris
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