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Table 2 Association of environmental parameters with the presence and density of An. farauti larvae in brackish water streams in North Guadalcanal, Solomon Islands

From: Influence of environmental factors on the abundance of Anopheles farauti larvae in large brackish water streams in Northern Guadalcanal, Solomon Islands

Parameter

B

Std. Error

Chi-Square

p value

1. Binary (presence/absence) model

    

   Algae

-0.365

0.2284

2.550

0.110

   Emergent Aquatic Plants

-0.019

0.0095

3.887

0.049*

   Rain_current

-0.001

0.0007

0.773

0.379

   Rain_lag

0.007

0.0012

35.116

0.000*

   Salinity

-0.113

0.0374

9.195

0.002*

   Sun Exposure

0.007

0.0077

0.889

0.346

2. Negative binomial (density) model

    

   Algae

0.023

0.0063

13.395

0.000*

   Emergent Aquatic Plants

0.014

0.0040

11.783

0.001*

   Rain_current

0.000

0.0006

0.291

0.589

   Rain_lag

-0.008

0.0008

93.786

0.000*

   Salinity

0.093

0.0376

6.072

0.014*

   Sun Exposure

0.002

0.0042

0.295

0.587

  1. Data were compared with GEEs with brackish water streams, larval sampling stations and month as subject variables to account for repeated sampling. The data was analyzed with two different distributions: 1) binary data (presence or absence) was fitted to a binomial distribution with a logit link function and 2) count data were fitted to a negative binomial distribution with a log link function because data was not normally distributed. For the density analysis, all larval collecting stations with zero counts of larvae were excluded.