Duke Studies Show That Environmental Effects Of Dams Extend To Insect Life

ting fruit have adapted to the flooding, completed in 1986. Using a small motorboat, she and her assistants visited four tiny islands weekly to make butterfly inventories. The now-isolated islands were located between 0.1 and 3 kilometers (a kilometer is about 6/10th of a mile) from "colonizing sources," places where the butterflies were known to have established populations.

Comparing those butterfly counts with others made at "control" sites on larger island and mainland locations, she came to a quick conclusion. "The big thing I found was that there were hardly any butterflies on these small islands, whereas if you went to a larger island or a continuous forest the densities are much higher," she recalled.

She found this puzzling, because her studies also showed many of these butterfly species were perfectly capable of flying to islands even farther away from the mainland. "I was very confused about how I was going to sort out all these effects and study them," she added. "So I decided to concentrate on one butterfly species."

Shahabuddin chose Hamadryas februa, one of a group commonly called "checkerspot" or "calico" butterflies because of their wing patterns. As a group, checkerspot butterflies are widely distributed in the American tropics, ranging north as far as Texas, she said.

However, the species Hamadryas februa is only known to lay its eggs on an inconspicous vine called Dalechampia scandens. This specificity made it easier for her to study why these butterflies might be found on one island but not on another. A helpful clue would be the presence or absence of egg-laying sites.

In 1996 and 1997, she expanded her study area to include 11 small islands and nine different control sites. She also did inventories of Dalachampia, the butterflies' "host" plants. "The most striking thing was that there were big differences from island to island in the numbers of host plants," she said. "One would think that

Contact: Monte Basgall
Duke University Medical Center

Page: 1 2 3 4

Related biology news :

1. Monkey business: Studies show tiny callimicos have unusual characteristics
2. Studies show success of Mectizan partnerships
3. Studies offer new insight into HIV vaccine development
4. Studies suggest brain injury results from developmental exposure to alcohol, anesthesia, and lead
5. Studies show preventive value of food supplements
6. Studies probe rapid evolution of Chinese tallow trees
7. Studies of rare blood syndrome yield novel route to cancer
8. Studies dispute ultraviolet effect on amphibian population declines
9. Studies of spiders silk reveal unusual strength
10. Studies of genes in mice and common worm may accelerate research on blood diseases, cancers
11. Studies offer data on potential impact of Reminyl on caregiver burden in Alzheimers disease

Post Your Comments:

(Date:6/30/2017)... Va. , June 30, 2017 ... leading developer and supplier of face and eye ... ATA Featured Product provider program. ... an innovative way to monitor a driver,s attentiveness ... greatly from being able to detect fatigue and ...
(Date:5/23/2017)... the first robotic gym for the rehabilitation and functional motor sense evaluation ... Genoa, Italy . The first 30 robots will be available from ... . The technology was developed and patented at the IIT laboratories ... Technology thanks to a 10 million euro investment from entrepreneur Sergio Dompè. ... ...
(Date:5/6/2017)... , May 5, 2017 ... just announced a new breakthrough in biometric authentication ... exploits quantum mechanical properties to perform biometric authentication. These ... smart semiconductor material created by Ram Group and ... finance, entertainment, transportation, supply chains and security. Ram ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... Singh Biotechnology today announced ... to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of Transcription 3) B ... to cross the cell membrane and bind intracellular STAT3 and inhibit its function. ...
(Date:10/10/2017)... ... October 10, 2017 , ... For the second time ... US2020 STEM Mentoring Award. Representatives of the FirstHand program travelled to Washington, D.C. ... US2020. , US2020’s mission is to change the trajectory of STEM education in ...
(Date:10/10/2017)... , Oct. 10, 2017 SomaGenics announced the ... NIH to develop RealSeq®-SC (Single Cell), expected to be ... small RNAs (including microRNAs) from single cells using NGS ... the need to accelerate development of approaches to analyze ... "New techniques for measuring levels of mRNAs ...
(Date:10/9/2017)... , Oct. 9, 2017  BioTech Holdings ... mechanism by which its ProCell stem cell therapy ... limb ischemia.  The Company, demonstrated that treatment with ... of limbs saved as compared to standard bone ... molecule HGF resulted in reduction of therapeutic effect.  ...
Breaking Biology Technology:
Cached News: