I am an American evolutionary biologist, based at Rutgers University, where I specialize in biodiversity, evolution, and genomics. Drop me a note, here. Thanks for your readership and support.
There’s an interesting phenomenon in the natural world known as “toxin sequestration.” It refers to cases where animals steal or scavenge toxic substances from other organisms for their own use. Toxin sequestration explains why the tiger keelback snake , endemic to the wooded areas of East and Southeast Asia, makes poisonous toads a regular part of its diet.
Many of the toads that the tiger keelback feasts on contain cardiotoxic steroids called “bufadienolides,” which are used as defensive chemicals. While this potent chemical cocktail is toxic to many of its predators–causing atrioventricular block, bradycardia , ventricular tachycardia , and possibly cardiac arrest–the tiger keelback has learned how to safely ingest bufadienolides and sequester them for its own defensive purposes.. The researchers set up a controlled experiment in which several tiger keelback snakes were either fed Japanese toxic toads or were restricted from eating toads altogether. They discovered that ingesting toads was, indeed, the way that the tiger keelback sequestered bufadienolides. Moreover, they found that tiger keelback mothers could transmit the potent defensive toxin to their offspring, but only if they had excess bufadienolides. Perhaps most interestingly, the researchers found that, while tiger keelback snakes from islands where no toxic toads were present did not possess bufadienolides, they could still amass their own reserves of the steroidal toxin when fed toxic toads in a laboratory. This suggests that adaptive pressures hadn’t yet erased the possibility of the snakes possessing this defensive strategy, even if their local diet precluded it.Forbes Releases 2024 30 Under 30 Asia List“Our results not only document a rare case in which defensive toxins are acquired from vertebrate prey but also provide a compelling example of the geographic, ecological, and evolutionary interplay between diet and antipredator defense,” state the authors. While rare, the tiger keelback isn’t alone in its use of toxin sequestration. Here are two other animals that implement this creative defensive strategy.), native to New Guinea, is characterized by its medium size and reddish-brown and black plumage, and stands out as one of the rare poisonous avian species. Batrachotoxin compounds–found in its skin, feathers, and other tissues–contribute to its toxicity and are believed to be acquired from its diet. These toxins serve as a defense mechanism against predators and potential parasites. Interestingly, unrelated non-poisonous species often mimic its appearance to evade predation, a phenomenon known in scientific circles as Batesian mimicry. Local hunters are aware of its toxic nature and typically avoid it. Although generally highly toxic, the potency of individual birds may vary depending on their geographic location. The hooded pitohui thrives in forested habitats, ranging from sea level to altitudes of 6,000+ feet, with a preference for hilly and low mountainous regions. Currently, the hooded pitohui maintains stable populations and is not considered endangered.The blue-capped ifrit, also endemic to New Guinea, is a small and insectivorous bird. It is considered to be an ancient relict species, representing the sole member of its family . Blue-capped ifrits belong to a small group of avian species known for their toxicity. Ifrits produce batrachotoxin, which they excrete into their feathers and skin as a defense mechanism against predators. Batrachotoxin typically binds to and permanently activates sodium channels in nerve cells, potentially leading to paralysis. The extent of toxin accumulation varies among individuals depending on their geographical location, possibly influenced by the availability of Choresine beetles, which are believed to be the primary dietary source of the toxin.Our community is about connecting people through open and thoughtful conversations. We want our readers to share their views and exchange ideas and facts in a safe space.Insults, profanity, incoherent, obscene or inflammatory language or threats of any kindContinuous attempts to re-post comments that have been previously moderated/rejectedAttempts or tactics that put the site security at riskProtect your community.
Clever Asian Snake Tiger Keelback Snake Toxic Toads Frog And Toad Defense Mechanisms Snake Predation Behavior Predator-Prey Interactions Asian Wildlife Photography Snake Adaptation To Toxins Asian Amphibians
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