Common Pesticides Associated with Lower Birth Weight and Shortened Pregnancy

Environmental Working Group
A new study is reinforcing obstetricians’ standard warning that pregnant women should avoid exposure to pesticides in foods and weed killers because the chemicals can harm the developing fetus.
In the study, Cincinnati-area women had levels of organophosphate insecticides that significantly affected birth weight and gestation period.
“This latest report is further evidence that babies in the womb are exquisitely sensitive to pesticide exposure,” said Ken Cook, president and co-founder of Environmental Working Group (EWG). “While much has been done to reduce people’s exposure to organophosphates, this important study shows that even remaining exposures are harmful.”
Lead researcher Bruce Lanphear MD MPH, and his colleagues tracked an ethnically and economically diverse group of more than 300 expectant mothers from the Cincinnati area. They found that newborns of women with the highest levels of organophosphates in their urine were delivered, on average, about half a week earlier and weighed one-third of a pound less than those of women with the lowest exposures.
The abstract of the new study can be found in the journal Environmental Health Perspectives.
For years, EWG has urged the U.S. Environmental Protection Agency to reduce the use of these highly toxic pesticides in agriculture and advised consumers to avoid fruits and vegetables with the highest levels of pesticides. Last year, three studies found that prenatal exposure to organophosphates was associated with diminished IQ in children. Other research has linked organophosphate exposure in children to increased risk of attention deficit hyperactivity disorder (ADHD).
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By Aaron W Hunter
A chance discovery of a beautifully preserved fossil in the desert landscape of Morocco has solved one of the great mysteries of biology and paleontology: how starfish evolved their arms.
The Pompeii of palaeontology. Aaron Hunter, Author provided
<h2></h2><p>Although starfish might appear very robust animals, they are typically made up of lots of hard parts attached by ligaments and soft tissue which, upon death, quickly degrade. This means we rely on places like the Fezouata formations to provide snapshots of their evolution.</p><p>The starfish fossil record is patchy, especially at the critical time when many of these animal groups first appeared. Sorting out how each of the various types of ancient starfish relate to each other is like putting a puzzle together when many of the parts are missing.</p><h2>The Oldest Starfish</h2><p><em><a href="https://www.biorxiv.org/content/10.1101/216101v1.full.pdf" target="_blank" rel="noopener noreferrer">Cantabrigiaster</a></em> is the most primitive starfish-like animal to be discovered in the fossil record. It was discovered in 2003, but it has taken over 17 years to work out its true significance.</p><p>What makes <em>Cantabrigiaster</em> unique is that it lacks almost all the characteristics we find in brittle stars and starfish.</p><p>Starfish and brittle stars belong to the family Asterozoa. Their ancestors, the Somasteroids were especially fragile - before <em>Cantabrigiaster</em> we only had a handful of specimens. The celebrated Moroccan paleontologist Mohamed <a href="https://doi.org/10.1016/j.palaeo.2016.06.041" target="_blank" rel="noopener noreferrer">Ben Moula</a> and his local team was instrumental in discovering <a href="https://www.sciencedirect.com/science/article/abs/pii/S0031018216302334?via%3Dihub" target="_blank" rel="noopener noreferrer">these amazing fossils</a> near the town of Zagora, in Morocco.</p><h2>The Breakthrough</h2><p>Our breakthrough moment came when I compared the arms of <em>Cantabrigiaster</em> with those of modern sea lilles, filter feeders with long feathery arms that tend to be attached to the sea floor by a stem or stalk.</p><p>The striking similarity between these modern filter feeders and the ancient starfish led our team from the University of Cambridge and Harvard University to create a new analysis. We applied a biological model to the features of all the current early Asterozoa fossils in existence, along with a sample of their closest relatives.</p>Cantabrigiaster is the most primitive starfish-like animal to be discovered in the fossil record. Aaron Hunter, Author provided
<p>Our results demonstrate <em>Cantabrigiaster</em> is the most primitive of all the Asterozoa, and most likely evolved from ancient animals called crinoids that lived 250 million years before dinosaurs. The five arms of starfish are a relic left over from these ancestors. In the case of <em>Cantabrigiaster</em>, and its starfish descendants, it evolved by flipping upside-down so its arms are face down on the sediment to feed.</p><p>Although we sampled a relatively small numbers of those ancestors, one of the unexpected outcomes was it provided an idea of how they could be related to each other. Paleontologists studying echinoderms are often lost in detail as all the different groups are so radically different from each other, so it is hard to tell which evolved first.</p>