- Author: Kathy Keatley Garvey
Have you ever wondered about sexual size dimorphism in the tropical spiders, the golden orbweavers?
The females are sometimes 10 times larger and 100 times heavier than their male counterparts. And the webs that the females weave are huge--they can be as wide as five feet in diameter.
And, yes, the females cannibalize the males, says Jason Bond, professor and Schlinger Chair in Insect Systematics, UC Davis Department of Entomology and Nematology,
“Sexual size dimorphism (SSD) often seems to be correlated with extreme morphological, behavioral and life history phenotypes in either sex,” says Bond, senior author of a newly published paper in the Journal of Systematic Biology, a peer-reviewed scientific journal published by Oxford University Press on behalf of the Society of Systematic Biologists.
Through phylogenomic (the intersection of the fields of evolution and genomics) and comparative analyses, Bond and his colleagues found that golden orbweavers “ignore biological rules.”
The global team of 11 scientists--from Slovenia, China, Taiwan, Czech Republic and the United States (UC Davis, Smithsonian Institution, University of Idaho, University of Florida and University of Vermont)--unraveled a complex evolution of sexual size and dimorphism and found that Nephilid female gigantism is a “phylogenetically ancient phenotype, over 100 million years old, though their magnitudes vary by lineage.”
The spiders belong to the genus Nephila and family Nephilidae; the members are known for constructing huge or exaggerated webs. The species thrive in warmer regions throughout the world, including Australia, Asia, Africa (including Madagascar) and the America. One species, N. clavipes, is found in southern United States, from Texas to North Carolina.
For the paper, “Golden Orbweavers Ignore Biological Rules: Phylogenomic and Comparative Analyses Unravel a Complex Evolution of Sexual Size Dimorphism,” the team tested two biological rules: Cope's rule and Rensch's rule. Cope's rule postulates that population lineages tend to increase in body size over evolutionary time. Rensch's rule is a biological rule on allometric patterns of male and female size. Neither rule applied to the golden orbweavers.
First, the scientists established the backbone phylogeny of Nephilidae, using 367 anchored hybrid enrichment markers, and then combined these data with classical markers for a reference species level phylogeny.
In conclusion, the scientists proposed a new clade, a group of organisms evolving from a common ancestor. They resurrected the family Nephilidae and proposed the new clade, Orbipurae, to contain Araneidae Clerck 1757, Phonognathidae Simon 1894, new rank, and Nephilidae.
The researchers proposed “taxonomic changes based on the criteria of clade age, monophyly and exclusivity, classification information content, and diagnosability. Spider families, as currently defined, tend to be between 37 million years old and 98 million years old, and Nephilidae is estimated at 133 million years old, thus deserving family status.”
“Nephilid female gigantism is a phylogenetically ancient phenotype (over 100 million years old), as is extreme sexual size dimorphism, though their magnitudes vary by lineage,” they wrote. “Despite the sometimes conflicting trends seen within Nephilidae, the clade stands as the most extreme example of female-biased SSD among terrestrial animals, as far as we know.”
The Jason Bond lab and the Chris Hamilton lab, Department of Entomology, Plant Pathology and Nematology at the University of Idaho, Moscow, provided the anchored hybrid enrichment data and phylogenomic analysis.
Co-authors of the paper, in addition to Bond and Hamilton, are
- Matjaž Kuntner of the National Institute of Biology, Ljubljana, Slovenia; the National Museum of Natural History, Smithsonian Institution, Washington D.C.; and Hubei University, China;
- Ren-Chung Cheng, Biological Institute ZRC SAZU, Ljubljana, Slovenia, and National Chung Hsing University, Taiwan;
- Matjaž Gregorič, Nik Lupše and Tjaša Lokovšek, all with the Biological Institute ZRC SAZU, Ljubljana,Slovenia (Lupse is also affiliated with the Charles University, Prague, Czech Republic);
- Emily Moriatry Lemmon and Alan Lemmon, Florida State University, Tallahassee;
- Ingi Agnarsson of the National Museum of Natural History, Smithsonian Institution; and University of Vermont, Burlington; and
- Jonathan Coddington, National Museum of Natural History, Smithsonian Institution.
The research drew funds from Slovenian Research Agency grants, from the U.S. State Department through a Fulbright visiting scholar; ZRZ Director's Fund, National Science Foundation, Doctoral Dissertation Improvement Grant and funds from Auburn University, Alabama. Bond joined the UC Davis faculty in July of 2018 from Auburn University after a seven-year academic career there, where he served as professor of biology and chaired the Department of Biological Sciences. He also curated the arachnids and myriapods (centipedes, millipedes, and related animals) at the Auburn University Museum of Natural History.
- Author: Kathy Keatley Garvey
Spiders--especially jumping spiders, crab spiders and orb weavers--fascinate me. They've been around for 400 million years and are cunning, skillful predators. I don't relish them eating a honey bee in our pollinator garden, but everything has to eat. If I were in charge of their culinary habits, though, I'd point them in the general direction of a delicious stink bug or a scrumptious green bottle fly or a tasty lygus bug. And ask them, pretty please, to leave my honey bees alone.
Still, many people fear spiders. Arachnophobia is a common phobia, but there are five good reasons to like spiders, according to Jason Bond of the UC Davis Department of Entomology and Nematology.
The five good reasons to like spiders?
- Spiders consume 400-800 million tons of prey, mostly insects, each year. Humans consume somewhere around 400 million tons of meat and fish each year.
- Spider silk is one of the strongest naturally occurring materials. Spider silk is stronger than steel, stronger and more stretchy than Kevlar; a pencil thick strand of spider silk could be used to stop a Boeing 747 in flight.
- Some spiders are incredibly fast – able to run up to 70 body lengths per second (10X faster than Usain Bolt).
- Athough nearly all 47,000-plus spider species have venom used to kill their insect prey, very few actually have venom that is harmful to humans.
- Some spiders are really good parents –wolf spider moms carry their young on their backs until they are ready to strike out on their own; female trapdoor spiders keep their broods safe inside their burrows often longer than one year, and some female jumping spiders even nurse their spiderlings with a protein rich substance comparable to milk.
Following his presentation, activity stations will be open in the Bohart Museum where visitors can “Assemble an Arachnid,” “Create a Chelicerate,” “Cribellate vs. Ecribellate Silk,” “Catch a Moth,” “Eat Like a Spider,” and learn about "Spider Senses" and “Trapdoor Specifics.”
Visitors will see live specimens and specimens in alcohol. They'll learn the differences between woolly silk and sticky silk. They'll see the Bohart arachnids--tarantulas--and hold some of the non-arachnids, including walking sticks and Madagascar hissing cockroaches.
“Spiders are an incredibly diverse group with more than 50,000 species described with probably another 200,000 remaining to yet be discovered,” says Bond, who joined the department last July from Auburn University, Alabama. “They are quite ancient, with fossils dating back well over 300 million years and are known to be exclusively predatory.”
Bond joined the UC Davis faculty after a seven-year academic career at Auburn University, Ala. He served as professor of biology and chair of the Department of Biological Sciences from January 2016 to July 2018, and as curator of arachnids and myriapods (centipedes, millipedes, and related animals) at the Auburn University Museum of Natural History, from August 2011 to July 2018.
The Bohart Museum of Entomology, directed by Lynn Kimsey, professor of entomology at UC Davis, houses nearly eight million insect specimens collected from all over the world. It also includes a gift shop and a live “petting zoo,” comprised of Madagascar hissing cockroaches, stick insects and tarantulas.
- Author: Kathy Keatley Garvey
But have you heard of the "Eight-Legged Wonders?"
You won't want to miss the "Eight-Legged Wonders" open house from 1 to 4 p.m., Saturday, March 9 at the Bohart Museum of Entomology, University of California, Davis.
If you miss it, you'll miss your opportunity to learn about spiders from an international expert, and miss the opportunity to "Assemble an Arachnid," "Create a Chelicerate" and "Eat Like a Spider."
Eat like a spider? Tabatha Yang, Bohart Museum's education and outreach coordinator, related you'll get to “slurp up soggy cookies.”
The event, free and family friendly, takes place primarily in Room 1124 of the Academic Surge Building on Crocker Lane.
Arachnid expert Jason Bond, who is the Evert and Marion Schlinger Endowed Chair in Insect Systematics in the UC Davis Department of Entomology and Nematology, will present a 10-minute slide show at 1 p.m. in the Museum of Wildlife and Fish Biology classroom, located on the first floor of the Academic Surge Building, next to the Bohart Museum.
You'll see live specimens and specimens in alcohol. You'll learn the differences between woolly silk and sticky silk. You'll also see the Bohart arachnids--tarantulas--and hold some of the non-arachnids, including walking sticks and Madagascar hissing cockroaches.
“Spiders are an incredibly diverse group with more than 50,000 species described with probably another 200,000 remaining to yet be discovered,” says Bond, who joined the department last July from Auburn University, Alabama. “They are quite ancient, with fossils dating back well over 300 million year and are known to be exclusively predatory. In fact, based on a study published last year, spiders are estimated to consume somewhere in the neighborhood of 800 million tons of insect biomass.”
“To capture insects, and other prey item--sometimes even vertebrates--most spiders employ silk and venom to snare and subdue their victims,” the arachnologist says. “Spider silk is an amazingly strong, proteinaceous material that is produced in many different forms; venoms are likewise complex, diverse proteins. All of this to say – what's not to like – spiders are a tremendously ecological important predatory group, that has persisted on the planet for 100s of millions of years and employ a remarkable suite of silks and venoms to make a living.”
Highly respected for his expertise on spiders, Bond served as the plenary keynote speaker at the 2016 International Arachnological Congress, and also keynoted the 2012 European Arachnological Congress.
Born in Johnson City, Tenn., Bond is a U.S. Army veteran who served for a number of years as a UH-60 Blackhawk helicopter crew chief. He received his bachelor's degree in biological sciences, cum laude, in 1993 from Western Carolina University, Cullowhee, and his master's degree in biology in 1995 from Virginia Polytechnic Institute and State University, Blacksburg. He earned his doctorate in evolutionary systematics and genetics in 1999 from Virginia Tech.
All three degrees focused on arachnids. His undergraduate thesis involved silk spigots; his master's degree, systematics of the spider genera Mallos and Mexitlia; and his doctoral dissertation covered “Systematics and Evolution of the Californian Trapdoor Spider Genus Aptostichus Simon (Araneae: Mygalomorphae: Cyrtaucheniidae).”
What drew him to arachnology? As an undergraduate researcher at Western Carolina University, Bond worked with noted arachnologists Jackie Palmer and Fred Coyle. “My first research project was related to functional morphology (evolution of the spinning apparatus in more primitive spiders) but quickly shifted to systematics and taxonomy.”
Bond joined the UC Davis faculty after a seven-year academic career at Auburn University, Ala. He served as professor of biology and chair of the Department of Biological Sciences from January 2016 to July 2018, and as curator of arachnids and myriapods (centipedes, millipedes, and related animals) at the Auburn University Museum of Natural History, from August 2011 to July 2018.
It was at Auburn University where Bond and his colleagues discovered a new species of trapdoor spider that drew international attention and a news story in the Huffington Post. They named it Myrmekiaphilia tigris, or the Auburn Tiger Trapdoor Spider, in honor of the university's costumed tiger mascot, Aubie. The discovery was exciting but not “surprising,” Bond told the Huffington Post, pointing out that it took taxonomists about 250 years to describe about 1.8 million plants and animals, and that this scratches the surface of what scientists estimate to be between five and 30 million overall species on earth.
The amazing eight-legged wonders!
- Author: Kathy Keatley Garvey
Directed by Lynn Kimsey, UC Davis professor of entomology, the insect museum is named for noted entomologist Richard M. Bohart.
It rocks not "just because" of the excellent scientists, staff and volunteers--and the fact that it houses
- nearly eight million insect specimens
- the seventh largest insect collection in North America
- the California Insect Survey, a storehouse of the insect biodiversity
- a live "petting zoo," comprised of Madagascar hissing cockroaches, walking sticks, tarantulas and praying mantids; and
- a year-around gift shop, which is stocked with T-shirts, sweatshirts, books, jewelry, posters, insect-collecting equipment and insect-themed candy
No, it's not "just because" of all those attributes, accolades and accomplishments.
It rocks because of...well...rocks.
Last Saturday, as part of its open house, Bohart Museum officials invited the guests to paint rocks.
"Paint a rock with your favorite insect! These rocks can join the #UCDavisRocks that are hidden around campus and downtown. Once found, these rocks can then be re-hidden as a happy surprise for others to discover. Pictures of your #UCDavisRocks can be shared on the UC Davis Rocks Facebook page."
The Bohart Museum officials drew inspiration from Yolo Rocks and Solano Rocks, but a similar organization on campus, UC Davis Rocks, launched a related activity last spring. It is the brainchild of Kim Pearson and Martha Garrison of the College of Letters and Science.
Tabatha Yang, education and outreach coordinator, coordinated the open house. UC Davis student Isabelle Gilchrist, a second-year entomology major, staffed the crafts activity table, offering rocks, paint and suggestions.
The theme of the open house, “Crafty Insects,” spotlighted crafty or sneaky insects (more photos of that in another blog), but a huge part of this open house starred rocks.
Just like Donna Billick, the self-described "rock artist" who sculpted the ceramic-mosaic worker bee, "Miss Bee Haven," in the Department of Entomology and Nematology's Häagen-Dazs Honey Bee Haven on Bee Biology Road, the Bohart artists rocked.
All of them!
(Editor's Note: The Bohart Museum's regular hours are from 9 a.m. to noon and 1 to 5 p.m. Mondays through Thursdays. It is closed to the public on Fridays, Saturdays and Sundays and on major holidays. Admission is free. More information on the Bohart Museum is available on the website or by contacting (530) 752-0493 or emailing bmuseum@ucdavis.edu
/span>/span>- Author: Kathy Keatley Garvey
Well, no, they don't.
Some folks scream, smash them, or sprint away from them.
Other folks--including yours truly--sprint toward them, not unlike firefighters racing into a burning building while everyone else is dashing out.
So it's gratifying to see that Feedspot.com has just published a list of the top 25 entomology blogs worldwide. All in one place. Bug lovers, unite!
Founder Anuj Agarwal says the blogs are ranked based on the following criteria:
- Google reputation and Google search ranking
- Influence and popularity on Facebook, twitter and other social media sites
- Quality and consistency of posts.
- Feedspot's editorial team and expert review
"The best entomology blogs," Agarwal told us, "are from thousands of entomology blogs in our index using search and social metrics. We've carefully selected these websites because they are actively working to educate, inspire, and empower their readers with frequent updates and high-quality information."
Feedspot, based in the United States, is a "News and blog reader used by over one million users," Agarwal related. "Globally. it's a place where users can read all their favorite websites in one place." The Feedspot editorial team "extensively searched on Google and social media websites to find the best entomology blogs and ranked them," based on several factors such as:
- Blog content quality
- Post consistency
- Age of the blog
- Average number of shares on social sites for your blog posts
- Traffic of your blog and more.
This blog, Bug Squad, which I've written for 10 years every night, Monday through Friday on the University of California Agriculture and Natural Resources (UC ANR) website, landed on the list as No. 12. Wasn't expecting that! (As an aside, I've never missed a night of posting, even on holidays and vacations.)
Which blog is No. 1? Entomology Today, published by the 7000-member Entomological Society of America.
Note that Feedspot Entomology currently lists the top 24 entomology blogs instead of the top 25, which is why this (list) below is missing one.
The list, along with the links:
- Entomology Today The Entomological Society of America (ESA) is the largest organization in the world serving the professional and scientific needs of entomologists and people in related disciplines
- What's That Bug? - Are we experts yet? In this blog you can send entries for bug identification. Get information about various kinds of bug around the world and more in this blog
- Catalogue of Organisms An entomologist and taxonomist, currently based in Perth, Western Australia
- Bug of the Week Written by "The Bug Guy," Michael J. Raupp, professor of entomology at the University of Maryland
- Bug Eric Get all information about insects, spiders, and other arthropods, focusing on North America north of Mexico. This is by Eric Eaton, principal author of Kaufman Field Guide to Insects of North America.
- Reddit | Entomology Find the latest news and information about entomology from Reddit.
- Reddit | Bug identification! Find information about all your bug identification needs, whether that be insects, spiders, crustaceans, or whatnot!
- The Jentsch Lab Find information about insect biology, ecology, and management in hudson valley agricultural commodities in this blog. The Jentsch is Peter Jentsch, senior Extension associate
- What's Crawling in the Lab? | Insect Diagnostic Lab | Department of Entomology Patrick (PJ) Liesch, the director of the University of Wisconsin-Madison Insect Diagnostic Lab, gives information about the ecology of bees and other pollinators, and the mechanisms by which they provide the invaluable service of pollination.
- Angler's Entomology Podcast A podcast about re-discovering fly fishing entomology. "We will review the major groups of aquatic insects - both relevant facts for fly fshing, but also interesting twists that make these critters fascinating."
- Blogs from the Natural History Museum | Entomology Blogs from the Natural History Museum | Entomology
- Bug Squad | Agriculture and Natural Resources Blogs This is a blog that appears on the University of California Agriculture and Natural Resources website. It's about the wonderful world of insects and the people who study them. (Text and photos by Kathy Keatley Garvey of the Department of Entomology and Nematology, University of California, Davis)
- Ask an Entomologist In this blog, "you can ask any questions related to entomology or bugs or insects, together we tackle your hardest questions about insects, their biology, ecology, physiology, or whatever else your beautiful and curious mind wants to know."
- Pensoft blog | Entomology Find information about entomology from this blog
- Buglife Buglife is billed as "the only organization in Europe devoted to the conservation of all invertebrates everything from bees to beetles, and spiders to snails."
- MYRMECOS – Little Things Matter A personal blog by entomologist and photographer Alex Wild (Alex Wild is the curator of entomology at the University of Texas, Austin, and holds a doctorate in entomology from the University of California, Davis, where he studied with Phil Ward)
- Wild About Ants Roberta Gibson is an entomologist and writer/blogger. She holds a master's degree in Entomology from Cornell University where she studied carpenter ants.
-
Beetles In The Bush Get all information about experiences and reflections of a Missouri entomologist
- Entomological Society of Canada The Entomological Society of Canada promotes research and disseminates knowledge about insects. Its flagship journal is The Canadian Entomologist (TCE).
- The Academy of Natural Sciences | Entomology Find information about entomology or insects from this blog.
- MObugs Get updates about Missouri entomology or insects and more by Shelly Cox.
-
FOCUS on Entomology Get all news about agricultural entomology from the Texas A&M AgriLife Research and Extension Center at Lubbock.
- Insects Unlocked Insects Unlocked (directed by Alex Wild) is a public domain project from The University of Texas at Austin's Insect Collection. Background: "In 2015, our team of student and community volunteers crowd-funded a campaign to create thousands of open, copyright-free images. From more than 200 small contributions, we built an insect photography field kit and photo studio. This website holds discussions of the small animals we encounter, updates from the project, and other entomological miscellanea."
- Mastering Entomology | Big Ideas About Little Things This site is run by the Entomology and Integrated Pest Management (IPM) students at Harper Adams University. "Get ideas about bugs or insects and more from this blog."
- (Currently not listed)