Can microplastics be ruled out? I ask because they are known to massively damage the stomach linings of some birds.
malnutrition too: https://www.niddk.nih.gov/-/media/Images/Health-Information/...
(Aside it’s confusing to post a graph that doesn’t have a title without context)
Plastics sometimes have plasticizers added, but if you're talking about microplastics, the amount of those chemicals in a microscopic piece of plastic is negligible.
Small is not always negligible.
Please explain how a 50 microgram piece of microplastic contains enough endocrine disruptor to have a biological effect?
Not even close. This is grossly overstated unless you talk about the full amount in the organism, that is an useless measure. Hormones act locally and trigger profound irreversible consequences in really tiny doses
> Please explain me how a 50 microgram piece of plastic contains enough endocrine disruptor to have a biological effect?
Adding its effects to the rest of the microplastics.
A handbook of Endocrinology will explain it much better, with tables, graphs and images.
Then the problem should be in the rest.