Yellow garden spider

by Roland D. Hallee

Last week I received an email from a reader who sent along a photo of a large yellow spider she found on her screen door. It was a menacing-looking thing.

It actually is a yellow garden spider, commonly known as the yellow garden spider, black and yellow garden spider, golden garden spider, writing spider, zigzag spider, zipper spider, black and yellow argiope, corn spider, Steeler spider, or McKinley spider.

The species was first described by Hippolyte Lucas in 1833. It is common to the contiguous United States, Hawaii, southern Canada, Mexico, and Central America. It has distinctive yellow and black markings on the abdomen and a mostly white cephalothorax. The body length of males range from 0.20 – 0.35 inches; females range from 0.75–1.10 inches. These spiders may bite if disturbed or harassed, but the venom is harmless to non-allergic humans, roughly equivalent to a bumblebee sting in intensity.

Yellow garden spiders often build webs in areas adjacent to open sunny fields where they stay concealed and protected from the wind. The spider can also be found along the eaves of houses and outbuildings or in any tall vegetation where they can securely stretch a web.

Female spiders tend to be somewhat local, often staying in one place throughout much of their lifetime.

The web of the yellow garden spider is distinctive: a circular shape up to two feet in diameter, with a dense zigzag of silk in the center.

The yellow garden spider can oscillate her web vigorously while she remains firmly attached in the center. This action might prevent predators like wasps and birds from drawing a good bead, and also to fully entangle an insect before it cuts itself loose. In a nightly ritual, the spider consumes the circular interior part of the web and then rebuilds it each morning with fresh new silk. The radial framework and anchoring lines are not usually replaced when the spider rebuilds the web. The spider may be recycling the chemicals used in web building. Additionally, the fine threads that she consumes appear to have tiny particles of what may be minuscule insects and organic matter that may contain nutrition.

The yellow garden spider does not live in very dense location clusters like other orb spiders. The yellow garden spider keeps a clean orderly web in comparison to the cluttered series of webs built and abandoned by groups of golden orb spiders.

This spider is found from Canada to Costa Rica, but less so in the basin and mountain areas of the Rockies.

These spiders are not aggressive. They might bite if grabbed, but other than for defense they do not attack large animals. Their venom often contains a library of toxins with potential as therapeutic medicinal agents.

A bite by the yellow garden spider is comparable to a bee sting with redness and swelling. For a healthy adult, a bite is not considered an issue. Though these spiders are not aggressive, people who are very young, elderly, or who have compromised immune systems should exercise caution, just as they would around a beehive or a hornet nest.

Yellow garden spiders breed twice a year. The males roam in search of a female, building a small web near or actually in the female’s web, then court the females by plucking strands on her web. Often, when the male approaches the female, he has a safety drop line ready, in case she attacks him. After mating, the male dies, and is sometimes then eaten by the female.

The female lays her eggs at night on a sheet of silky material, then covers them with another layer of silk, then a protective brownish silk. She then uses her legs to form the sheet into a ball with an upturned neck.

In the spring, the young spiders exit the sac. They are so tiny that they look like dust gathered inside the silk mesh. Some of the spiderlings remain nearby, but others exude a strand of silk that gets caught by the breeze, carrying the spiderling to a more distant area.

Females of the species are the most commonly seen in gardens. Their webs are usually characterized by a zigzag shaped extra thick line of silk in the middle extending vertically. The spiders spend most of their time in their webs, waiting for prey to become ensnared. When prey becomes caught in the web, the spider may undulate the web back and forth to further trap the insect. When the prey is secure, the spider kills it by injecting its venom and then wraps the prey in a cocoon of silk for later consumption (typically one to four hours later). Prey includes small vertebrates, such as geckos and green anoles, as well as insects.

If you find one of these around your house, it is not as dangerous as it looks.

Easy for me to say, Mr. I-don’t-like-spiders.

Roland’s trivia question of the week:

Who were the four outfielders on the Red Sox’ 2018 World Series championship team?

Answer can be found here.

Left, Northern ringneck snake. Right, Northern ringneck snake
under side.

by Roland D. Hallee

A friend of mine, who lives in Sidney, sent a text message with the photo of a snake he found under his wood pile. He said he had never seen one before. Neither have I. The snake was black with a bright yellow ring around its neck. What he found is fairly common.

Diadophis punctatus, commonly known as the ring-necked snake or ringneck snake, is a harmless species of snake found throughout much of the United States, central Mexico, and south-eastern Canada. Ring-necked snakes are secretive, nocturnal snakes, so are rarely seen during the day time. They are best known for their unique defense posture of curling up their tails, exposing their bright red-orange posterior, ventral surface when threatened.

Ring-necked snakes are believed to be fairly abundant throughout most of their range, though no scientific evaluation supports this hypothesis. Scientific research is lacking for the ring-necked snake, and more in-depth investigations are greatly needed.

Ring-necked snakes are fairly similar in morphology throughout much of their distribution. Its dorsal coloration is solid olive, brown, bluish-gray to smoky black, broken only by a distinct yellow, red, or yellow-orange neck band.

Size also varies across the species’ distribution. Typically, adults measure 10–15 inches in length,

Ring-necked snakes have smooth scales with 15–17 scale rows at midbody. Males typically have small tubercles on their scales just anterior to the vent, which are usually absent in females.

Ring-necked snakes usually mate in the spring.

Ring-necked snakes are fairly common throughout much of the United States extending into southeastern Canada and central Mexico. Eastern populations cover the entire Eastern seaboard from the Gulf of Saint Lawrence, in Canada, continuous through the Gulf Coast of Texas. Distribution moves inland into northern Minnesota, continuing diagonally through the U.S. to include all of Iowa, eastern Nebraska, and most of Kansas. In the western U.S., the distribution is significantly less continuous, with spotty, distinct population segments through most of the Pacific Northwest. Populations extend from south-central Washington continuing along the extreme West Coast into Mexico. Population segments extend inland into western Idaho, through southern Nevada, into central Utah, and continuing south through Arizona and central Mexico.

Ring-necked snakes occur in a wide variety of habitats. Preference seems to be determined by areas with abundant cover and denning locations. Northern and western subspecies are found within open woodlands near rocky hillsides, or in wetter environments with abundant cover or woody debris.

Since it is a woodland reptile, it can also commonly be found under wood or scraps. Because of hot weather, they tend to make holes and burrows, or they hide under rocks or any suitable material. They are normally found in flatland forests. Though they prefer to remain away from human-made structures, ring-neck snakes are not afraid to utilize urbanized areas as refuge from predators.

The diet of the ring-necked snake consists primarily of smaller salamanders, earthworms, and slugs, but they also sometimes eat lizards, frogs, and some juvenile snakes of other species. The frequency at which prey species are chosen is dependent on their availability within the habitat. Ring-necked snakes use a combination of constriction and venom to secure their prey. In a study analyzing the dietary habits of this species, age, amount of food consumed, and temperature were conditions that highly affected digestion. The snakes do not have a true venom gland, but they do have a structure called the Duvernoy’s gland derived from the same tissue. The venom is produced in the Duvernoy’s gland located directly behind the eye. It then drains out of an opening at the rear of the maxillary tooth. Ring-necked snakes first strike and then secure the prey using constriction. Next, they maneuver their mouths forward, ensuring the last maxillary tooth punctures the skin and allowing the venom to enter the prey’s tissue. The secretion significantly affects the righting response of the prey. Ring-necked snakes are rarely aggressive toward larger predators, suggesting their venom evolved as a feeding strategy rather than a defense mechanism. Rather than trying to bite a predator, the snake winds up its tail into a corkscrew, exposing its brightly colored belly.

Ring-necked snakes are primarily nocturnal or can be found at twilight, though some day time activity has been observed. Individuals are sometimes found during the day, especially on cloudy days, sunning themselves to gain heat. Yet, most individuals lie directly under surface objects warmed in the sun and use conduction with that object to gain heat. Though ring-necked snakes are highly secretive, they do display some social structure, but the exact social hierarchies have never been evaluated. Many populations have been identified to have large colonies of more than 100 individuals, and some reports indicate some smaller colonies occupy the same microhabitats.

If you should see one, it’s harmless to humans.

Roland’s trivia question of the week:

Who were the Boston Red Sox’ “Gold Dust Twins” in the 1970s?

Answer can be found here.