Navigation Links
Die-offs of band-tailed pigeons connected to newly discovered parasite
Date:7/2/2014

A new pathogen has been discovered by scientists investigating major die-offs of pigeons native to North America, according to studies led by the University of California, Davis, and the California Department of Fish and Wildlife.

Scientists were able to implicate this new parasite, along with the ancient parasite Trichomonas gallinae, in the recent deaths of thousands of Pacific Coast band-tailed pigeons. The die-offs occurred during multiple epidemics in California's Central Coast and Sierra Nevada mountain ranges. Scientists named the new pathogen Trichomonas stableri.

Avian trichomonosis is an emerging and potentially fatal disease that creates severe lesions that can block the esophagus, ultimately preventing the bird from eating or drinking, or the trachea, leading to suffocation. The disease may date back to when dinosaurs roamed the earth, as lesions indicative of trichomonosis were found recently in T-Rex skeletons. The disease may also have contributed to the decline of the passenger pigeon, whose extinction occurred exactly 100 years ago.

Epidemics of the disease can result in the death of thousands of birds in a short amount of time. An outbreak in Carmel Valley killed an estimated 43,000 birds in 2007.

"The same parasite species that killed band-tailed pigeons during the outbreaks were also killing the birds when there weren't outbreaks," said lead author Yvette Girard, a postdoctoral scholar with the Wildlife Health Center in the UC Davis School of Veterinary Medicine at the time of the studies. "This indicates there may be other factors at play in the die-offs."

"We are now investigating what triggers these die-offs, which may be caused by the congregation of infected and vulnerable birds during certain environmental conditions, or even spillover from another nearby species," said principal investigator Christine Johnson, a professor with the UC Davis Wildlife Health Center.

Between winter 2011 and spring 2012, there were eight mortality events -- defined as more than five dead birds found in the same geographic area during the same time frame. The study said trichomonosis was confirmed in 96 percent of dead, sick or dying birds examined at seven of the mortality events. This disease was also found in:

  • 36 percent of band-tailed pigeons at wildlife rehabilitation centers

  • 11 percent of hunter-killed band-tailed pigeons

  • 4 percent of the birds caught live and released

"What makes this disease more troublesome for band-tailed pigeons is their low reproductive rate -- about one chick per year -- and also that these events are occurring in the wintertime," said co-author Krysta Rogers, an environmental scientist with the California Department of Fish and Wildlife. "That means almost all the birds we're losing during events are adult birds. They're being killed before they have the ability to reproduce in the spring."

Mortality events in band-tailed pigeons have been reported in California at least since 1945, but have increased during the last decade, with outbreaks reported in six of the last 10 years.

"Going into the study, we expected to find a single, highly virulent species of Trichomonas in birds sampled at outbreaks," Girard said. "Having two species killing birds at these large-scale mortality events is surprising."

Necropsies of the birds were conducted at the California Animal Health and Food Safety Laboratory at UC Davis and the Wildlife Investigations Laboratory at the California Department of Fish and Wildlife.

Both studies were funded by the California Department of Fish and Wildlife and the U.S. Fish and Wildlife Service.

The study naming the new species of parasite is published in the journal International Journal for Parasitology: Parasites and Wildlife. The study that explains how trichomonosis is affecting the band-tailed pigeon is published in the journal Infection, Genetics and Evolution.


'/>"/>

Contact: Yvette Girard
yagirard@ucdavis.edu
University of California - Davis
Source:Eurekalert  

Related biology news :

1. Great lakes waterfowl die-offs: Finding the source
2. How pigeons may smell their way home
3. Mutant gene responsible for pigeons head crests
4. Cancer, bioelectrical signals and the microbiome connected
5. How memory and schizophrenia are connected
6. Health Affairs examines successes and missing links in connected health
7. Genetic risk for schizophrenia is connected to reduced IQ
8. Stocking Florida bass in Texas reservoirs may alter stream systems connected to stocked reservoirs
9. Measuring dispersal -- how well are soft-sediment invertebrate communities connected on the seafloor?
10. DNA barcoding verified the discovery of a highly disconnected crane fly species
11. Newly identified gene provides reliable visual cue for oil palm fruit ripeness
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Die-offs of band-tailed pigeons connected to newly discovered parasite
(Date:2/2/2016)... This BCC Research report provides a ... the recent advances in high throughput ‘omic platforms ... forward. Includes forecast through 2019. Use ... opportunities that exist in the bioinformatic market. Analyze ... well as IT and bioinformatics service providers. Analyze ...
(Date:2/2/2016)... Technology Enhancements Accelerate Growth of X-ray Imaging ... and computed radiography markets in Thailand ... Indonesia (TIM). It provides an in-depth analysis ... as regional market drivers and restraints. The study offers ... market attractiveness, both for digital and computed radiography. Market ...
(Date:2/2/2016)... Calif. , Feb. 2, 2016  Based ... market, Frost & Sullivan recognizes US-based Intelligent Retinal ... Frost & Sullivan Award for New Product Innovation. ... in North America , is ... the rapidly growing diabetic retinopathy market. The IRIS ...
Breaking Biology News(10 mins):
(Date:2/11/2016)... ATLANTA , Feb. 11, 2016  Wellcentive ... a Portland, Oregon -based community ... to provide population health analytics, quality reporting and ... help FamilyCare strengthen its team of quality managers, ... reporting to the provider groups serving FamilyCare members. ...
(Date:2/11/2016)... , ... February 11, 2016 , ... ... more than 150 years, continues today to pursue the highest level of accuracy ... analytical instruments: the AR9 Refractometer and the AR5 Refractometer. Accurate, reliable and ...
(Date:2/10/2016)... , Feb. 10, 2016  The Maryland House of ... has announced that University of Maryland School of Medicine ... and University of Maryland Medical System President and CEO ... "Speaker,s Medallion," the highest honor given to the public ... Dean Reece and Mr. Chrencik for ...
(Date:2/10/2016)... plc (NYSE: AGN ) a leading global pharmaceutical ... CEO and President, will be featured as the keynote ... Capital Markets Healthcare Conference on Tuesday, February 23, 2016 ... Hotel in New York, NY . ... accessed on Allergan,s Investor Relations web site at ...
Breaking Biology Technology: