Conor O'Gorman
Well-Known Member
There are hundreds of studies showing lead shot as the proven source of lead poisoning in birds going back a hundred years. It is well understood that ingestion of even one piece of lead shot can lead to lead poisoning in some birds.As far as I have been able to ascertain not only has nobody died but nobody has EVER been admitted to hospital with the symptoms of lead poisoning? other than by lead vapour from lead smelting. As far as the "well evidenced" cases of wild birds suffering from lead injestion, there is none! No person or organisation has, as far as I can find out, ever found a bird in this country, in the wild, whose autopsy shows lead as cause of death? what people/organisation's have done is to take birds, feed them lead shot in a lab, then subsequently say "ah well it's killed this one with 40 size 4 lead shot, 3 million of them enter the environment each year so 10000 birds must be killed! That is not science, it is supposition. As a final totally unscientific study I shoot in commercial duck shoot, yes I do shoot steel, and over the last season opened the wizards of 30 mallard, I found 1 shot, about size 1-2 steel!
You mention mallard and your own findings of shot ingestion. A detection rate of 1 in 30 birds having shot in the gizzard is within the range of findings from many studies. Below is an overview from 1960 with references going back 50 years. Fast forward 85 years and we have had 135 years of evidence, that continues to grow.
Here is a paper from 1983:
The incidence and significance of ingested lead pellet poisoning in British Wildfowl
For a range of species, including pink-footed goose, white-fronted goose, barnacle goose, wigeon, teal, pintail, shoveler, scaup and moorhen, recorded incidences were either very low or zero. Relatively high incidences were noted for swans, greylag goose (7·1% of shot birds), gadwall (11·8%), mallard (4·2%), pochard (10·9%), tufted duck (11·7%) and goldeneye (6·7%).
Here is a 2023 update from Scotland where lead shot use has declined on Islay.
Lead is a toxic heavy metal that when ingested can cause death or sub-lethal fitnesseffects. Despite its toxicity, it is still widely used in recreational and management shootingglobally. To reduce the impacts of lead on wildfowl, recent European Union legislationhas banned the use of lead shot in and around wetlands from 2023. Understanding theeffectiveness of such mitigation is vital to inform future policy. On Islay, Scotland, thelicensed shooting of Barnacle Geese Branta leucopsis to reduce agricultural damage hasadhered to the ban on use of lead shot over Ramsar-designated wetlands legislated inScotland in 2004. On average 2380 lead cartridges were fired annually between 2005 and2020 outside designated wetlands, where Barnacle Geese and other wildfowl forage. Fromfaecal samples, it is possible to infer whether birds have ingested lead and are thereforepotentially suffering from lead poisoning. After sampling faeces from Barnacle Geese (n =193) and Greenland White-fronted Geese Anser albifrons flavirostris (n = 150) we foundonly four (1.2%) faecal samples with elevated lead levels that may be indicative of leadshot ingestion. Further post-mortem examinations (n = 102 Barnacle Geese only) and Xray of live birds (n = 293) revealed similarly low levels of shot ingestion in both species(post-mortem < 4%, and X-ray < 2%), corroborating findings from faecal sample analysis.When subsequently accounting for limited shot retention time within individuals, theproportion of each population ingesting a single lead shot over a winter was estimated ata maximum of 9.4% (Barnacle Geese) and 16.8% (White-fronted Geese). We proposethat high compliance with the ban on using lead shot over wetlands because of carefullycontrolled shooting management on Islay has led to relatively low instantaneous ingestionrates, probably resulting in minimal lead poisoning mortality. However, ingestion was noteliminated and the potential fitness effect of chronic lead poisoning in both goose populations therefore persists, although use of lead shot in organized shooting has subsequentlybeen discontinued. Recent European Union bans on lead shot use over wetlands mayreduce lead ingestion in waterfowl if compliance rates are high, but as foraging oftenoccurs outside wetlands (as in this study), further restrictions including use on other keyforaging sites may help to further mitigate the risk of lead poisoning in waterfowl.
https://pureadmin.uhi.ac.uk/ws/portalfiles/portal/38784090/120_Ibis_Geese_on_Islay_Pb_shot.pdf
That's just for starters. Have a look on Google Scholar for hundreds of studies.

, always political 