Navigation Links
Walking in the footsteps of 19th and 20th century naturalists
Date:2/28/2013

ees were nowhere to be found. The scientists never saw them.

Robertson's bees were mostly solitary bees, small, nondescript bees that lay a few eggs in cells and leave their young to develop on their own.

"Some of these bees have broad distributions, encompassing, for example, the entire eastern United States, so even though they're locally extirpated, most are not extinct," said Knight.

The re-collection also revealed timing mismatches between the bees and the plants. Plants were flowering earlier than they had in Robertson's time: on average. 9.5 days earlier. Bees were active earlier too: on average 11 days earlier.

But despite similar average shifts, timing mismatches occurred, because the early-season bees advanced a lot more than the late-season bees, said Knight, and no such pattern occurred among the plants.

Moreover, everything had speeded up. The flowers were in bloom eight fewer days on average and the insects flew for 22.5 fewer days. Because everything was more compressed, there was less overlap and less time for successful pollination.

Of the 532 pairings between the plants and bees that linked the subset of Robertson's network Knight and Burkle studied, 406 had been lost (but 120 new pairings had been gained). Forty five percent of the links were broken because bee species were missing, and the rest had broken for other reasons, including timing mismatches or habitat fragmentation.

A 40-year-old re-collection of Robertson's network

But Burkle and Knight were aware that counting network links was a crude measure of pollination services. "All the network diagrams say is the bee is present, the plant is present, and we saw them interacting at least once," Knight points out.

"Robertson didn't keep track of how much time he spent in the field watching each flower, so we couldn't get visitation rates from his data. But of course we searched the literature to see whether anybody h
'/>"/>

Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

Page: 1 2 3 4 5

Related biology news :

1. Pond skating insects reveal water-walking secrets
2. These bots were made for walking: Cells power biological machines
3. Walking on marbles could be a thing of the past for arthritis patients
4. The Scars of Human Evolution briefing explores physical fallout from 2-footed walking
5. Following in Marie Curies footsteps
6. 17th century Dutch explorers help the Atlas reach a major milestone -- 30 million records
7. lobSTR algorithm rolls DNA fingerprinting into 21st century
8. Mercury rising: Greater L.A. to heat up an average 4 to 5 degrees by mid-century
9. Wallaces century-old map of natural world updated
10. Urban metabolism for the urban century
11. A*STAR scientists solve century-old mystery by finding stable haploid strains of Candida albicans
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Walking in the footsteps of 19th and 20th century naturalists
(Date:9/29/2014)... A University of Texas at Arlington research team says ... built in their lab could open doors for homeland ... be published in the Oct. 1 issue of ... and his co-authors describe a new method to fabricate ... and oxygen until a transparent ceramic is formed. ...
(Date:9/29/2014)... has received a five-year, $6 million grant for ... evaluation and development of safe and effective treatments ... from the National Institutes of Health, National Institute ... for Medication Development for Cocaine Use Disorder to ... guide decisions on moving forward with more expensive ...
(Date:9/29/2014)... For decades, planetary geologists have speculated that glaciers ... 2000-mile-long chasm that constitutes the Grand Canyon of ... that might have been carved by past glaciers ... observations have remained highly controversial and contested. ... College and the Freie Universitaet Berlin has identified ...
Breaking Biology News(10 mins):UT Arlington researchers develop new transparent nanoscintillators for radiation detection 2UT Arlington researchers develop new transparent nanoscintillators for radiation detection 3New VCU center to target cocaine addiction 2Glaciers in the Grand Canyon of Mars? 2Glaciers in the Grand Canyon of Mars? 3Glaciers in the Grand Canyon of Mars? 4Glaciers in the Grand Canyon of Mars? 5Glaciers in the Grand Canyon of Mars? 6Glaciers in the Grand Canyon of Mars? 7Glaciers in the Grand Canyon of Mars? 8Glaciers in the Grand Canyon of Mars? 9
... (Santa Barbara, Calif.) An international team of researchers ... that happens in virtually every cell of our bodies. ... folded chains of amino acids assume their specific shapes, ... widely: In the human body, proteins fold to become ...
... family history of liver cancer is reported to increase risk ... findings published in the May issue of Hepatology , ... Liver Diseases. The study also shows 70-fold elevated risk of ... markers for hepatitis B (HBV) or hepatitis C (HCV). ...
... Princeton University researchers have observed a self-degradation response to ... provide new answers to lingering questions among scientists about ... that depression is not solely linked to the neurotransmitter ... PLoS ONE , researchers based in the lab of ...
Cached Biology News:In protein folding, internal friction may play a more significant role than previously thought 2Family history of liver cancer increases risk of developing the disease 2Yeast cell reaction to Zoloft suggests alternative cause, drug target for depression 2Yeast cell reaction to Zoloft suggests alternative cause, drug target for depression 3Yeast cell reaction to Zoloft suggests alternative cause, drug target for depression 4
(Date:9/29/2014)... Each year in the US, ... attention. In the military, burn injury is a ... medical care. More than 800 service members sustained ... heal slowly, remain inflamed and often become infected, ... and functionally damaging. While developments in supportive care ...
(Date:9/29/2014)... at the forefront of diagnostics today, with imaging ... tomography), scanning, and NMR (nuclear magnetic resonance) increasing ... problems of image resolution and quality still limit ... tissue. A solution is hyperpolarization, which involves injecting ... quality by following the distribution and fate of ...
(Date:9/29/2014)... conflicts in Iraq and Afghanistan, more than 300,000 soldiers ... injury caused by exposure to bomb blasts and ... Symptoms of traumatic brain injury can range from the ... severe impairments in memory and cognition. , Since ... critical importance and complexity of this problem, and has ...
(Date:9/29/2014)... Va. , Sept. 29, 2014  Ten ... the fields of cartilage repair, regeneration, allograft reconstruction ... from around the world gathered to discuss the ... Health Institute of Regenerative Medicine symposium, Cartilage ... . Topics included Orthopedic Biosurgery, Minced Juvenile Allograft, ...
Breaking Biology Technology:Faster Healing with Fewer Scars 2A safer approach for diagnostic medical imaging 2A safer approach for diagnostic medical imaging 3Modeling shockwaves through the brain 2Modeling shockwaves through the brain 3Modeling shockwaves through the brain 4World Renowned Experts Discuss Future Of Cartilage Regeneration 2World Renowned Experts Discuss Future Of Cartilage Regeneration 3
... Dendreon Corporation,(Nasdaq: DNDN ) today announced ... NEUVENGE, an investigational active cellular immunotherapy, in the,August ... The article highlights,the safety profile, immune response and ... cancer who have failed standard,therapy. "In addition ...
... Inc., a biotechnology company developing pharmaceutical products for ... dollar financing deal. The majority of the funding, ... the remainder was borrowed from the Madison Development ... Funds, a private investment firm. The funds raised ...
... more than a marketing campaign and the involvement of ... managers, senior executives and middle managers responsible for creating ... play a vital role in marketing the brand. Employees ... work. , ,Be Your Message. Employer brand building ...
Cached Biology Technology:Dendreon Announces Publication of Phase 1 Study Highlighting Immunologic and Clinical Activity of Lapuleucel-T (Neuvenge(R)) in Advanced Breast Cancer Patients 2Dendreon Announces Publication of Phase 1 Study Highlighting Immunologic and Clinical Activity of Lapuleucel-T (Neuvenge(R)) in Advanced Breast Cancer Patients 3Dendreon Announces Publication of Phase 1 Study Highlighting Immunologic and Clinical Activity of Lapuleucel-T (Neuvenge(R)) in Advanced Breast Cancer Patients 4Quintessence Secures Financing 2Quintessence Secures Financing 3Employer Brands Require More Than Slick Marketing 2
... xi 2-D system runs both gel dimensions in the ... can be separated in a single run using the ... in much the same manner as the slab gel ... slab gels may be cast in the casting stand. ...
... Application Series are a line of ... provide fast and reliable automated solutions ... robust "automation-friendly" building blocks, Caliper has ... less than conventional approaches, take up ...
... 2-Methyl-3,5,7,8-tetrahydrothiopyrano[4,3-d]pyrimidine-4-one White solid. ... A brain-permeable and water soluble pyrimidinone compound ... + -competitive inhibitor of PARP (IC 50 ... for rhPARP1 and rmPARP2, respectively) with little ...
...
Biology Products: