Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Diet of elusive red widow spider revealed by MU biologist

21.03.2014

Beetles: it's what's for breakfast—at least for the red widow spider of Florida's "scrub" habitat, according to a study by University of Missouri biologist James Carrel.

The study provides a first glimpse at the diet of this mysterious spider, revealing that it primarily preys upon species of scarab beetles common to the scrub habitat. Carrel's findings shed light on red widow spiders' restriction to the Florida scrub habitat and the need for habitat conservation efforts.

Red Widow Spider

Latrodectus bishopi gets its name for the reddish-orange coloring of its head, carapace, and legs. Although venomous, no bites from this spider have been recorded.

Credit: James Carrel

Scrub Palmetto Scarab

Trigonopeltastes floridana is one species of scarab beetles endemic to the Florida scrub that the red widow spider preys on.

Credit: Tim Lethbridge

"The pine scrub habitat, found on sandy ridges in Central and Southeastern Florida, is one of the oldest in North America," said Carrel, Curators Professor Emeritus in the MU Division of Biological Sciences. "Many of the plants and animals found on these ridges, including the red widow spider, are restricted to these high, dry areas. Our research suggests that red widows have evolved to specialize on scarab beetles because they are reliable food sources."

... more about:
»beetles »biologist »endemic »populations »scrub »species »spiders

Carrel said that red widow spiders are difficult to study due to habitat confinement and the hidden nature of their webs, which are built in palmetto shrubs. Red widows conceal their funnel-shaped retreats in unopened palmetto leaves, making them difficult to spot. The only clues to the spiders' presence, visible solely on foggy mornings during four months of the year, are the threads spun loosely between tips of palmetto frond.

Since 1987, Carrel has been monitoring populations of this spider at the Archbold Biological Station, which protects a 5,193-acre Florida scrub preserve near Lake Placid. Only twice in those 23 years – in March 1989 and in May 2003 – have enough webs been located to study the dietary habits of these elusive spiders. The scientists identified 43 species of insects among the 98 specimens collected. The study revealed that the primary prey of the spider, especially in early spring, are five species of scarab beetles endemic to the Florida scrub habitat.

"The scarab beetles, which often are larger and stronger than the spiders themselves, fly just above the tops of scrub vegetation," said Mark Deyrup, senior research biologist for the Archbold Biological Station, who co-authored the study. "Sometimes beetles hit the web strands between tips of palmetto fronds and tumble into the denser tangle of threads below, catching them in the red widows' webs."

Carrel has monitored red widow spider populations at the Station since 1987, but has found enough webs to study red widows' dietary habits only twice. During both time periods, Carrel worked alongside Deyrup to collect and identify prey from spiders' webs.

Carrel's study, entitled "Red widow spiders prey extensively on scarab beetles endemic in Florida scrub," appeared in the March issue of the Florida Entomologist. Funding for the study came in part from a grant from the University of Missouri in Columbia, MO.

Jeff Sossamon | EurekAlert!
Further information:
http://www.missouri.edu

Further reports about: beetles biologist endemic populations scrub species spiders

More articles from Life Sciences:

nachricht At last, butterflies get a bigger, better evolutionary tree
16.02.2018 | Florida Museum of Natural History

nachricht New treatment strategies for chronic kidney disease from the animal kingdom
16.02.2018 | Veterinärmedizinische Universität Wien

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>