HOME >> BIOLOGY >> NEWS
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
Monte@dukenews.duke.edu
919-681-8057
Duke University Medical Center
5-Aug-1998


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:
*Name:
*Comment:
*Email:


(Date:4/13/2017)... UBM,s Advanced Design and Manufacturing event in ... and evolving technology through its 3D Printing and Smart ... the expo portion of the event and feature a ... on trending topics within 3D printing and smart manufacturing. ... will take place June 13-15, 2017 at the Jacob K. ...
(Date:4/11/2017)... , April 11, 2017 NXT-ID, Inc. ... technology company, announces the appointment of independent Directors Mr. ... to its Board of Directors, furthering the company,s corporate governance ... Gino ... we look forward to their guidance and benefiting from their ...
(Date:4/4/2017)... April 4, 2017   EyeLock LLC , a ... the United States Patent and Trademark Office (USPTO) has ... the linking of an iris image with a face ... represents the company,s 45 th issued patent. ... very timely given the multi-modal biometric capabilities that have ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... The CRISPR-Cas9 ... enabling overexpression experiments and avoiding the use of exogenous expression plasmids. The simplicity ... for performing systematic gain-of-function studies. , This complement to loss-of-function studies, such ...
(Date:10/11/2017)... LAGUNA HILLS, Calif. , Oct. 11, 2017  SkylineDx ... London (ICR) and University of Leeds ... to risk-stratify patients with multiple myeloma (MM), in a multi-centric ... The University of Leeds is the ... UK, and ICR will perform the testing services to include ...
(Date:10/10/2017)... ... October 10, 2017 , ... ... conjugate (ADC) therapeutics, today confirmed licensing rights that give it exclusive global ... technology developed in collaboration with Children’s Hospital Los Angeles (CHLA). Additionally, ...
(Date:10/10/2017)... (PRWEB) , ... October 10, 2017 , ... ... innovation and business process optimization firm for the life sciences and healthcare industries, ... conference in San Francisco. , The presentation, “Automating GxP Validation for Agile ...
Breaking Biology Technology:
Cached News: