Foreign Joro Invasion

Although it didn’t cause national hysteria like the beetle invasion of 1964 (or was it Beatles in the British Invasion???), I did happen to hear about the Jorō Spider invasion of 2014. There were a few articles and blogs as this East Asian species was first found in Madison County, Georgia, not far from my home town of Athens.

Female Joro Spider in a web ventral view
© Photographer: William Wise | iNat Observation: 59267584

A University of Georgia article wrote, "The Jorō spider, native Japan, Korea, China and Taiwan, belongs to a group of large spiders known as golden orb-web weavers that make enormous, multi-layered webs of gold-colored silk. [Researchers] suspect the Jorō spider arrived accidentally as a hitchhiker either in shipping containers or among shipped packing materials such as pallets and crates or even on live plant material."

Large Female Joro Spider dorsal view in a web
© Photographer: William Wise | iNat Observation: 59267584

Introduced and invasive species often impact the native species and can even upset the balance of an entire ecosystem, such as the pythons in the Everglades. While Jorō Spider pose no threat to humans, it is unknown if they will adversely affect the native Yellow Garden Spider by competing in the same niche.

Yellow Garden Spider spinning prey in a web
© Photographer: William Wise | iNat Observation: 59353542

In 2018 I began to see them pop up regularly in iNaturalist observations in Georgia. But it wasn’t until today that I found one in my own backyard. It was nearly impossible to miss. A strand of the thick web extended from the top of my backyard cypress, and about 15 to 20 feet at a downward angle and anchored to another lower bush. In the middle, suspended in a tangled web just above a Yucca, hung the ornately patterned female. A few days later I noticed a smaller spider “hanging out” with her. It was identified by other iNat users as the male of the species.

Large Female Joro Spider and small male in a web
© Photographer: William Wise | iNat Observaton: 59357361

There are now over 300 sightings of the Jorō Spider posted on iNaturalist in Georgia, and two in South Carolina. Who knows how far and wide this invasion will sweep, or if it will have as long lasting an impact as the British Invasion that forever changed the music landscape of the world! ​​

פורסם על-ידי williamwisephoto williamwisephoto, ספטמבר 19, 2020 12:38 אחה"צ

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