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:2/28/2017)... -- News solutions for biometrics, bag drop and New ... At ... 16 March, Materna will present its complete end-to-end passenger journey, ... a real benefit for passengers. To accelerate the whole passenger ... point solutions to take passengers through the complete integrated process ...
(Date:2/22/2017)... With the biometrics market to exceed ... technologies that innovative and agile startups must incorporate ... the changing competitive landscape: multifactor authentication (MFA), point-of-sale ... "Companies can no longer afford to cut ... Dimitrios Pavlakis , Industry Analyst at ABI Research. ...
(Date:2/13/2017)... 13, 2017  RSA Conference -- RSA, a Dell ... designed to enhance fraud detection and investigation across ... RSA Fraud & Risk Intelligence Suite. The new ... additional insights from internal and external sources as ... their customers from targeted cybercrime attacks. ...
Breaking Biology News(10 mins):
(Date:3/23/2017)... YORK , March 23, 2017 ... ... of death, putting significant strain on health care systems, in ... cancer diagnoses rises, so too does the development of innovative ... minimum side effects. Among the many types of cancer treatments, ...
(Date:3/23/2017)... March 23, 2017 In today,s ... equities in the Biotech industry: Sangamo Therapeutics Inc. (NASDAQ: ... (NYSE MKT: SYN), and Regulus Therapeutics Inc. (NASDAQ: ... 2017, Credit Suisse upgraded its rating on Pharmaceuticals/Biotechnology to "Overweight" from "Market ... free report at: ...
(Date:3/22/2017)... (PRWEB) , ... March 22, 2017 , ... ... up human tissue regeneration from small lab samples to full-size tissues, bones, even ... to establish a vascular system that delivers blood deep into the developing tissue. ...
(Date:3/22/2017)... 2017 Good Start Genetics, a leading family ... 130 million covered lives mark through its most recent ... Texas . With newly signed contracts nationally and ... strong payor acceptance based on the quality of its ... counseling, its industry-leading customer care and support and its ...
Breaking Biology Technology: