By Herp News
The 2012 film ‘The Flight of the Butterflies’ documented the year-long annual migration cycle of the Monarch Butterfly. But now, scientists believe that fewer numbers are actually taking this epic journey. Photo credit: Dave Hart. A recent study concludes that a new, overwintering population of the Monarch butterfly (Danaus plexippus) in the Southern U.S. is the direct result of ideal breeding conditions created by increased plantings of a non-native tropical milkweed (Asclepias curassavica) — plantings that are cultivated by gardeners attempting to aid the migrating butterflies. Unfortunately, these overwintering populations of Monarchs unexpectedly suffer from higher rates of disease and parasitic infection, and pose “an additional emerging threat to the long term viability of migratory Monarchs by altering infectious disease dynamics among still-migrating Monarchs,” says a research paper published in the journal Proceedings of the Royal Society B. Surprising detrimental results The scientists from the University of Georgia who performed the study believe that increased plantings of Asclepias curassavica, commonly known as ‘tropical milkweed’, in the U.S. South has prompted a population of formerly migrating Monarchs to overwinter. This overwintering trend has been occurring for decades, as more and more concerned gardeners plant the readily available tropical milkweed. Native milkweeds die back in autumn, giving a clear signal for butterflies to move south. However, tropical milkweed does not, providing a ready food source and perfect breeding habitat for the butterflies, and, unfortunately, their diseases. Monarchs infected with Ophryocystis elektroscirrha (OE) often do…
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Read more here: herpetofauna.com
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