Navigation Links
Spiders who eat together, stay together: UBC research
Date:8/6/2008

The ability to work together and capture larger prey has allowed social spiders to stretch the laws of nature and reach enormous colony sizes, UBC zoologists have found.

The findings, published in this week's edition of the Proceedings of the National Academy of Science, may also explain why social spiders thrive in tropical areas but dwindle with increasing latitude and elevation.

"The size of organisms tends to be constrained by a scaling principle scientists call 'surface to volume ratio,'" says Leticia Avils, lead author and associate professor in the UBC Dept. of Zoology. While organisms typically have energetic needs proportional to their volume, they must acquire nutrients through their surface.

"As the organism grows, this surface to volume ratio declines. In a way, this is how nature keeps the sizes of various species in check."

The same principle may apply to social groups. The surface area of the three-dimensional webs social spiders use to capture prey does not grow as fast as the number of spiders contained in the nests; so number of incoming prey per spider declines with colony size. But Anelosimus eximius, a species of social spider notable for its enormous colony size some total more than 20,000 individuals have gained the ability to stretch that law by cooperating and thus capturing increasingly large insects as their colonies grow.

"The average size of the prey captured by the colony increased 20-fold as colony size increased from less than 100 to 10,000 spiders," says Avils, who studied the spiders in the wild in Amazonian Ecuador with undergraduate student Eric Yip and graduate student Kimberly Powers.

"So even though the number of prey falls sharply as the colony grows, the biomass that individual spiders acquire actually increases."

The study also found that large prey, while making up only eight per cent of the colony's diet, contributed to more than 75 per cent of
'/>"/>

Contact: Brian Lin
brian.lin@ubc.ca
604-822-2234
University of British Columbia
Source:Eurekalert

Page: 1 2

Related biology news :

1. Life Sciences Discovery Fund awards health research project grants
2. UGA researchers win $9.2 million stem cell grant from NIH
3. Research exposes new target for malaria drugs
4. Broad Institute researchers introduce next generation tool for visualizing genomic data
5. Spanish researchers discover significant leatherback turtle nesting beaches in the Caribbean
6. DOE and USDA announce more than $10 million in bioenergy plant feedstock research
7. EPA funds ground-breaking Lyme disease research
8. ORNL researchers analyze material with colossal ionic conductivity
9. UNH researchers tag first-ever free-swimming leatherback turtles in New England
10. Small research at MSU leads to advances in energy, electronics
11. FSU, Magnet Lab researchers license critical petroleum data
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/20/2015)... , May 20, 2015 /PRNewswire/ ... http://www.researchandmarkets.com/research/h8t4x6/5year ) has announced the addition ... the Global Iris Recognition Market"  report ... , ,This research service analyses trends ... the government and commercial sectors, globally. ...
(Date:5/19/2015)... 2015 Fingerprint Cards (FPC) has received ... FPC1155 and FPC1035 from one if its module partners. Deliveries ... Q3 2015 and the sensors will be used by smartphone ... for 2015 hereby amount to 740 MSEK to date. In ... MSEK and a number of smaller orders not separately communicated ...
(Date:5/19/2015)... DUBLIN , May 19, 2015 /PRNewswire/ ... ) has announced the addition of the  ... their offering.  ,     (Logo: http://photos.prnewswire.com/prnh/20130307/600769) , ,A ... provides an in-depth analysis of the current ... introduction of gene-based tests, their working principles ...
Breaking Biology News(10 mins):Global Iris Recognition Market Report 2015 - 5-Year Opportunity Analysis 2Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 230 Million and Raises Revenue Guidance for 2015 2Global Genetic Testing Market Outlook 2018 2
... CHAMPAIGN, Ill. Using detailed land analysis, Illinois ... land could produce up to half of the world,s ... pastureland. Published in the journal Environmental Science ... environmental engineering professor Ximing Cai identified land around the ...
... several herbicides used on corn also have good selectivity ... potential bioenergy feedstock. "No herbicides are currently labeled ... Eric Anderson, an instructor of bioenergy for the Center ... "Our research shows that several herbicides used on corn ...
... , A team of researchers led by professor Deborah Steinberg ... Antarctica for their annual 6-week field season aboard the research ... zooplankton at a series of sampling stations in the waters ... understand how climate change is affecting the microscopic animals that ...
Cached Biology News:Study estimates land available for biofuel crops 2Miscanthus has a fighting chance against weeds 2VIMS team returns to Antarctic Peninsula 2VIMS team returns to Antarctic Peninsula 3
(Date:5/21/2015)... May 21, 2015 Patent Offering, The ... for diagnostic or therapeutic imaging within a body lumen ... an endoscope having a low cost, single-use disposable illumination ... date was October 18, 2013 and the patent approval ... enables the physician to customize the lighting and magnification ...
(Date:5/21/2015)... 2015 Research and Markets ( ... "2015 Global Survey on Flow Cytometry Adoption ... The primary goal of this research is to ... reagents. Key information the survey seeks to collect ... cytometers, predominantly used applications for flow cytometers, respondents, ...
(Date:5/21/2015)... (PRWEB) May 21, 2015 Tunnell ... joined the firm as senior statistician and Principal, a ... of experience in the management and analysis of complex ... and chemical industries. , “We’re delighted to have Julia ... in data analytics,” said Dr. Philippe Cini, Group Vice ...
(Date:5/20/2015)... May 20, 2015 This year has ... for lawns. US Patented Pearl’s Premium Ultra Low ... around the country that are coming out of record ... a number of major global concerns related to water, ... grass – the alternative to the standard, water-wasting, chemical-treated ...
Breaking Biology Technology:IpAuctions™ Presents The Worlds Smallest Disposable Illuminated Endoscope For Auction 2IpAuctions™ Presents The Worlds Smallest Disposable Illuminated Endoscope For Auction 3Global Survey on Flow Cytometry Adoption Trends 2015 2Julia O’Neill Joins Tunnell Consulting’s Operational and Process Improvement Practice 2Breakthrough 4th Generation Low Maintenance Lawn Seed Offers Solution to California Drought 2
... Call Scheduled for Thursday, March 19, 2009 at 11:00 ... Milestone Scientific Inc. (OTC Bulletin Board: ... announced that it intends to file its 2008 year-end ... with the U.S. Securities & Exchange Commission on Tuesday, ...
... Medarex, Inc. (Nasdaq: MEDX ) announced today ... to be the subject of poster presentations at the ... (AACR), being held April 18-22, 2009 in Colorado:, ... "A Phase I, open-label, dose-escalation, multi-dose study of ...
... Mass., March 17 Magellan Biosciences, an emerging ... Frost & Sullivan 2009 North American Product Innovation ... that enables children and adults to be screened ... Magellan,s President of Clinical Diagnostics, James Whelan, will ...
Cached Biology Technology:Milestone Scientific to Report 2008 Year-End Results on Tuesday, March 17, 2009 2Milestone Scientific to Report 2008 Year-End Results on Tuesday, March 17, 2009 3Medarex Announces Presentations at Annual Meeting of the American Association for Cancer Research 2Magellan to Receive Frost & Sullivan 2009 North American Product Innovation Award; Three-Minute LeadCare(R) II Test Identifies Children with Lead Poisoning 2Magellan to Receive Frost & Sullivan 2009 North American Product Innovation Award; Three-Minute LeadCare(R) II Test Identifies Children with Lead Poisoning 3Magellan to Receive Frost & Sullivan 2009 North American Product Innovation Award; Three-Minute LeadCare(R) II Test Identifies Children with Lead Poisoning 4
... BioCoat Collagen I 60 mm Culture Dishes ... tissue-culture treated polystyrene with a uniform application of ... : Collagen I ,Surface : ... cm2 ,Dim nominal : 60 mm ...
The piston kit includes 2 pistons to service one F10 pump of a BioLogic DuoFlow workstation....
BD BioCoat BD MatrigelTM Matrix 100 mm Culture Dishes for hepatocytes, tissue-culture treated polystyrene with a uniform application of MATRIGEL Matrix....
The F40 piston assembly is supplied as two assemblies to service one F40 pump of a BioLogic DuoFlow workstation....
Biology Products: