Navigation Links
Why female moths are big and beautiful
Date:3/11/2010

at the literature, they realized something was missing in the picture.

"Since there is no difference at least that we know of between the male and female genes controlling growth, nobody could figure out why we see what we see in nature: differently sized males and females," said Stillwell.

Scientists have known that growth rates do not differ between female and male caterpillars and thus cannot account for the observed size difference. Rather, the sexual dimorphism observed in the adult animals more likely has to do with differences in the time the two sexes spent as growing larvae. Even in light of that, nearly all research has focused on the adult animals.

"We are the first ones to look at the larvae with this question in mind," Stillwell said.

Stillwell and Davidowitz chose the giant hawk moth (Manduca sexta), a species native to Arizona, as a model organism, mostly because this insect species is well-studied, easily bred in the lab and large enough to allow for ease of handling and measuring.

The researchers followed more than 1,200 caterpillars from the time they hatched, all the way through four molts and until they pupated. They weighed and measured the animals at different times during development and fed the data into a complex statistical model they developed.

For most of their lives as caterpillars, females and males do not appear much different.

"The final larval stage is when it all happens," Stillwell said. "There is a point in the caterpillar's life when an inner clock and environmental cues tell the animal it's time to become an adult. Hormonal changes make them stop feeding and wander around looking for a place to pupate. Within a few hours they develop into a pupa, from which the adult moth will emerge a few weeks later."

Stillwell and Davidowitz discovered that female caterpillars initiate this fundamental change a bit later than the males. By the time the female caterpill
'/>"/>

Contact: Daniel Stolte
stolte@email.arizona.edu
520-626-4402
University of Arizona
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Sex is thirst-quenching for female beetles
2. UT Southwestern researchers identify hundreds of genes controlling female fertility
3. Why do males and females frequently differ in body size and structure?
4. X-effect: female chromosome confirmed a prime driver of speciation
5. Vaginal reconstruction not needed for most inter-sex females, Hopkins study shows
6. Gene in male fish lures females into sex
7. New evidence for female control in reproduction
8. Men unaware of their cancer risk when female relatives test positive for BRCA mutation
9. How do you know whether you are male or female?
10. Female katydids prefer mates cool in winter and hot in summer
11. Female concave-eared frogs draw mates with ultrasonic calls
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Why female moths are big and beautiful
(Date:9/29/2014)... In popular culture, mathematics is often deemed inaccessible or ... ever more important role in our daily lives and ... new ideas often behind the scenes. , UC ... of Mathematics and an assistant professor of mechanical engineering, ... Some of his recent research published in the ...
(Date:9/29/2014)... real-time feedback system together with a human energy delegate ... of 37% in energy consumption when compared to normal ... to a reduction of 713.71 kg of CO 2 ... eight halls, exposed only to the real-time feedback and ... reduction in energy consumption. , Student,s energy-use behaviour is ...
(Date:9/29/2014)... spheres of fluid, not normally considered capable of doing ... droplets of alcohol move through water. In the future, ... to move on your own to be self-moving ... But also non-living entities can be self-moving, report researchers ... Technology in Prague, Czech Republic. , The researchers have ...
Breaking Biology News(10 mins):At the interface of math and science 2At the interface of math and science 3At the interface of math and science 4Scientists make droplets move on their own 2
... how a human cell is supposed to work, it,s hard ... -- as it does in cancer. That,s why a Florida ... $1.2 million grant to explore the role of centrosomes and ... human disease. Tim Megraw, a veteran researcher who joined ...
... BIRMINGHAM, Ala. University of Alabama at Birmingham (UAB) ... Alabama,s Dauphin Island coastline are working to keep the ... Diamondback Terrapin has been a national delicacy, a source ... and victim of new predators, but now its prospects ...
... 22, 2009) -- The tools of biochemistry have finally ... University in Houston and the University of Florence in ... which was the first known genetic regulatory protein when ... tied together two segments within individual molecules of lactose ...
Cached Biology News:Researcher awarded $1.2 million grant to study centrosomes and cilia 2UAB research team saves turtle species on the brink 2UAB research team saves turtle species on the brink 3All tied up: Tethered protein provides long-sought answer 2All tied up: Tethered protein provides long-sought answer 3
(Date:9/30/2014)... 2014 UFP Technologies, a producer ... has recently introduced a custom insulated shipping container ... The new insulated shipper solves the issue of ... UFP Technologies’ BioShell is a universal storage container ... handling and shipping. The insulated shipper keeps frozen ...
(Date:9/29/2014)... September 30, 2014 Each year ... injuries require medical attention. In the military, burn ... complications to battlefield medical care. More than 800 ... Afghanistan. Burn wounds heal slowly, remain inflamed and ... excessive, physically debilitating and functionally damaging. While developments ...
(Date:9/29/2014)... -- Research and Markets  has announced the addition ... Services, End-User , Application - Global Forecast to 2019" ... global oligonucleotide synthesis market is expected to reach $1,712.1 ... at a CAGR of 9.8% from 2014 to 2019. ... basis of products and services, applications, end users, and ...
(Date:9/29/2014)... Research and Markets  has announced the addition of ... Chromatograph Market by Type , Technology, Spectroscopy, Gas chromatography, ... to 2013 - 2020" report to their offering. ... analytical instrument that provides chemical composition data on process ... which companies carry out their production and improve the ...
Breaking Biology Technology:UFP Technologies Introduces Insulated Shipping Container For Bulk Drug Transportation 2UFP Technologies Introduces Insulated Shipping Container For Bulk Drug Transportation 3Faster Healing with Fewer Scars 2Oligonucleotide Synthesis (Diagnostics, PCR, QPCR, Gene Synthesis, NGS, DNA, RNAi) Market - Global Forecast to 2019 2Oligonucleotide Synthesis (Diagnostics, PCR, QPCR, Gene Synthesis, NGS, DNA, RNAi) Market - Global Forecast to 2019 3Global Process Liquid Analyzer, Gas Analyzer, and Gas Chromatograph (PH/ORP, Chlorine, Oxygen, Carbon dioxide) Market - Trends & Forecast to 2020 2Global Process Liquid Analyzer, Gas Analyzer, and Gas Chromatograph (PH/ORP, Chlorine, Oxygen, Carbon dioxide) Market - Trends & Forecast to 2020 3Global Process Liquid Analyzer, Gas Analyzer, and Gas Chromatograph (PH/ORP, Chlorine, Oxygen, Carbon dioxide) Market - Trends & Forecast to 2020 4
... AIS is a provider of browser-based policy, ... the system allows business users to maintain much ... technical resources are conserved. The combination of Fiserv ... companies to automate customer communication, provide high levels ...
... ,You did it; you brought Bill Gates to his tender knees. ... campus. 'Curses, you worm writer, you!" It echoed among the buildings, ... teeth. And beneath the whimpers you could almost hear Billy saying ... money and fix my software."* , ,Wow, if only ...
... get techies into ballgame, too , ,As the ... recent or soon-to-be college grads may view a career ... could only see what really goes on in todays ... systems, robotic welding, remote sensoring and other modern staples ...
Cached Biology Technology:Open Letter: Blasted Worm 2Open Letter: Blasted Worm 3Manufacturing still viable career 2Manufacturing still viable career 3
sterile filtered, off the clot, all male donors, Total Protein: 4.5 to 8.5 g/dl...
sterile filtered, off the clot, all male donors, Total Protein: 4.5 to 8.5 g/dl...
... Designed to histochemically detect ... distinct pH in cultured ... The specific marker is ... cells (not found in ...
TAR DNA binding protein...
Biology Products: