Species specific sampling effort and AI prevalence

This analysis is based on AVHS data from 2006-2011 and from 2014 - 2017. Samples reflect the first capture and sampele of a bird and include 88 unique bird species. Overall sampling effort is shown below for each year and each month.

The species collected most in the dataset were Mallard (MALL: 16669), Wood Duck (WODU: 7369), Northern Pintail (NOPI: 4441), Canada goose (CAGO: 4403), Green-winged teal (AGWT: 1916); Blue-wingted teal (BWTE: 1910), American Black Duck (AMDU: 1783), and Gadwall (GADW: 1183). Only species with more than 100 samples collected are displayed.

The figure, below, shows AI prevalence based on pcr from a combined cloacal and oropharyngeal swab sample (other sample types were removed for consistency between years during data cleaning). Species with the highest AI prevalence were, Mallards (MALL), Cinnamon Teal (CITE), Blue-winged Teal (BWTE); Green-winged teal (AGWT); Ruddy Turnstone (RUTU), Northern Shoveler (NSHO), and Redhead (REDH)

Age and sex specific information

Detection of AI by shedding is thought to occur during an animals first exposure to infection before the development of protective antibodies. I expect age-specific detection patterns in both females (red) and males (blue). Age categories are Local (L), Hatch Year (HY), and After Hatch Year (AHY; > 1). Local designates a young bird known to have hatched during that year that incapable of sustained flight. Hatch year designateds a bird capable of sustained flight still less than one year old. After hatch year refers to all older individual.

Mallard and Canada Goose

Wood duck and Northern Pintail

Gadwall and Green-winged Teal

Ring-necked duck and American Black Duck

Blue-winged Teal and American Wigeon

Now with H5 and H7

Overall

For Mallards, Northern Pintail; Green-winged Teal; American Black Duck(?); Blue-winged teal; American Wigeon

Other species are not displayed when prevalence of H5 or H7 is less than 1%. Canada Goose (H5 prev = 0.001, H7 prev = 0); Wood duck (H5 prev = 0.007, H7 = 0.002); Gadw (H5 = 0.005; H7 = 0); Rndu (H5 = 0; H7 = 0);

Seasonal information in the AVHS dataset

Plots of monthly sampling and prevalence show that most sampling occured between June and October. Prevalence is also highest at those times, but this could be due to sampling effort. There is a low, but non-zero prevalence in Northern Pintail and Mallards prevalence outside this sampling window.

Spatial information in the AVHS dataset