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2 years ago in Ecology , Environmental Toxicology By Vinod D
Which air pollutants most affect moss- and lichen-dwelling invertebrates like tardigrades?
My fieldwork involves monitoring tardigrade populations in city parks versus forests. I've seen population drops near roads, but I'm unsure which pollutant is the primary driver. Is it the heavy metals from brake dust, nitrogen deposition altering their food source, or direct toxicity from ozone? Understanding this would sharpen my bioindicator protocols.
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By Rahul K Answered 1 year ago
From my experience with urban biomonitoring, the threat is multi-faceted. Gaseous pollutants like nitrogen dioxide and ozone are chronic stressors that degrade the lichen symbiosis, reducing the food and habitat quality. However, I have seen the most direct correlation with fine particulate matter (PM2.5) and associated heavy metals. These particles coat moss surfaces, impeding gas exchange for the invertebrates and introducing toxins that bioaccumulate. For your protocol, I would recommend analyzing both atmospheric NOx levels and the metal content in your moss samples to get the full picture.
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