Tag Archives: Maggots

Rouse Maggots: Pioneering Species for Revolutionary ‘Extinction Drive’ Efforts

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Screwworm Larva

A fang-like lower jaw protrudes from the mouth of a screwworm larva.

Scott Camazine/Alamy

While the extinction of certain species might be deemed controversial, in some cases, it could be beneficial. For example, eliminating malaria-carrying mosquitoes might improve global health.

Advancements in genetic technology, notably through gene drives, enable the deliberate alteration of species populations. These gene drives can rapidly disseminate harmful traits within populations, yet, currently, the technology’s application against malaria-carrying mosquitoes is limited. Researchers like Kevin Esvelt at MIT have pioneered CRISPR-based gene drives to target pests such as the screwworm (Cochliomyia hominivorax).

As Esvelt notes, “I bet on the New World screwworm fly, an insect even more detested than mosquitoes.” Screwworm flies are notorious for laying eggs in the wounds of mammals, leading to severe injury and even death for the host. Livestock farmers face significant challenges due to screwworm infestations.

Historically, screwworms thrived across the Americas but were eradicated in North and Central America during the 1960s, though they still pose a threat in parts of South America.

The removal of screwworms in North America hinged on the sterile insect technique. Since female screwworms mate only once, introducing sterile males into the wild can effectively curb population growth. However, this method is costly and hasn’t been employed in South America—genetic modification through gene drives might present a feasible alternative.

Understanding Gene Drives

Gene drives refer to mechanisms that skew inheritance rates. Typically, offspring inherit DNA from both parents, which may reduce the prevalence of harmful traits over time. A genetic drive can ensure that more than half of the offspring inherit a specific trait, even if that trait proves disadvantageous.

Through natural mating processes, the gene drive replicates itself, resulting in the propagation of specific traits within a population, which could lead to substantial declines in numbers.

For example, gene drives can be engineered to disrupt essential reproductive genes, potentially rendering populations infertile over time. This is superior to traditional sterile insect techniques, which require mass releases of sterilized insects.

Addressing Controversies

Though the application of gene drives toward eradicating malaria-carrying mosquitoes would be revolutionary, public resistance rooted in concerns surrounding genetic modification limits such initiatives. For instance, a gene drive project in Burkina Faso was recently halted due to opposition, illustrating the challenges faced in promoting genetic modification.

The debate around genetic modification often reflects broader societal views. It’s vital to recognize that genetic modification is already embedded in agriculture, and the focus should be on the applications rather than the technology itself.

Gene drives, while appearing alarming, are part of natural processes. Resistance to unfavorable traits is expected, yet innovative solutions can be developed to enhance their effectiveness.

Efforts to eliminate screwworms through gene drives are already underway, with projects initiated by institutions like the National Institute of Agricultural Technology (INIA) in Uruguay and the Guardian Program by DARPA. While detailed information is scarce, the successful development of gene drives against mosquitoes indicates potential in targeting screwworms.

As Colossal Biosciences proposes to develop gene drives for screwworm eradication, their lack of experience raises concerns, emphasizing the significant knowledge and expertise needed in this field.

Critics often argue about the ecological consequences of eradicating certain species; however, with precedents in successful species removal, the potential benefits to human health should be carefully weighed against fears of ecological imbalance.

In summary, advancements in gene drive technology may pave the way for eradicating harmful pest populations and improving public health. The memory of screwworm infestations serves as a reminder of the urgent need for effective pest management strategies in the Americas.

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Source: www.newscientist.com

Neanderthals Likely Resembled Maggots Rather Than Hypercarnivores.

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The rotting meat maggot might have been vital to ancient diets

Chronicle/Alam

Neanderthals may not have been the exclusive meat-eaters we once presumed. Analysis of nitrogen isotope ratios in their bones suggests a diet predominantly consisting of meat. Yet, these ratios could also result from a more varied, omnivorous intake that involved significant consumption of maggots.

“Trout pieces are readily accessible, nutritious resources,” notes Melanie Beasley from Purdue University in Indiana.

Historical evidence indicates that maggots were eaten regularly across different societies, and she points out that some reindeer hunters today consider them a snack, intentionally cultivating specific maggot types. For instance, Casu Marzu, a cheese containing live maggots, is a Sardinian delicacy.

Nitrogen comprises two stable isotopes, nitrogen-14 and nitrogen-15. Lighter isotopes tend to be lost from organisms more readily than heavier ones, resulting in a higher nitrogen-15 to nitrogen-14 ratio as food progresses up the trophic levels.

By examining the isotopic ratios in collagen from fossilized bones, researchers gauge the dietary habits of carnivorous animals, which tend to exhibit higher ratios than herbivores. However, upon studying Neanderthal bones, researchers found unexpectedly high ratios, even surpassing those of lions and hyenas. “This led to the myth of Neanderthals as intense hunters of large game,” explains Beasley.

Nevertheless, many researchers challenge this theory. Notably, bones from early Homo sapiens exhibit similar nitrogen ratios. Moreover, these early humans could not survive on lean meat alone. “It’s physically impossible,” Beasley states. “You’d suffer from what early explorers termed ‘rabbit starvation.’”

The dilemma lies in the fact that an excessively protein-rich diet can overwhelm the body’s ability to eliminate harmful byproducts like ammonia.

Moreover, significant direct evidence from dental calculus studies confirms that Neanderthals also consumed plant matter. So why is their nitrogen-15 ratio so elevated?

In 2017, John Speth at the University of Michigan proposed that Neanderthals might have stored their meat and consumed it in a decomposed state. When meat rots, it releases gases such as ammonia, which should lead to an increased nitrogen-15 concentration.

At that time, Beasley sought to conduct research at the University of Tennessee’s Body Farm, where human decomposition studies help in forensic investigations. There, she observed maggots feeding on corpses.

With Speth and Julie Lesnik from Wayne State University in Michigan, Beasley discovered that while nitrogen isotopic ratios do rise as muscle tissue decays, the increase is more pronounced in various types of maggots feeding on decomposing bodies.

While these findings are preliminary, they suggest that a purely meat-centric diet may not fully account for the nitrogen isotopic ratios seen in Neanderthals and early Homo sapiens, claims Beasley. She theorizes that these ratios may result from a blend of factors, including meat storage, preparation, cooking, and maggot consumption.

“This is an exciting new study that could significantly enhance our understanding of the perplexing results that have arisen from isotopic studies of Neanderthals and other Stone Age hominins over the years,” asserts Herman Ponzer from Duke University in North Carolina.

“The evidence here is quite persuasive that the consumption of maggots and similar larvae could clarify the ‘hypercarnivore’ indicators noted in past fossil isotope investigations,” he affirms.

Furthermore, this research supports the notion that the so-called Paleolithic diet should encompass rotten meat and maggots, according to Beasley. “Anyone interested in historical accuracy should consider fermenting meat and accessing fly larvae.”

Neanderthals, Ancient Humans, Cave Art: France

Join new scientist Kate Douglas as she embarks on an intriguing journey through time, exploring significant Neanderthal and Upper Paleolithic sites across southern France, from Bordeaux to Montpellier.

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Source: www.newscientist.com