Navigation Links
Parasites might spur evolution of strange amphibian breeding habits
Date:11/14/2007

Athens, Ga. Parasites can decimate amphibian populations, but one University of Georgia researcher believes they might also play a role in spurring the evolution of new and sometimes bizarre breeding strategies.

Brian Todd, a researcher at the UGA Odum School of Ecology Savannah River Ecology Lab, explains that most amphibians start their lives in water (tadpoles are a good example), and then make their way onto land as adults and return to the water to breed. But there are other breeding strategies as well. Take, for instance, the Darwins frog, the species that swallows its eggs and, a few weeks later, regurgitates its young. Or the marsupial frog, a species that carries its eggs on its back until they hatch. Several species lay eggs in small puddles on land or high up in trees where they hatch as miniature versions of adults, bypassing the larval stage entirely.

Researchers have hypothesized that natural selection favored these non-traditional breeding strategies as a way to avoid predatory fish or the risk of a breeding pond or stream drying up. In a review article published in the November issue of The American Naturalist, Todd argues that the diversity of reproductive strategies that amphibians employ might also be influenced by the benefits that come from avoiding viruses, fungi and other parasites.

Most parasites known to affect amphibians tend to be aquatic, so there are clearly benefits to using non-traditional breeding strategies, Todd said.

He points out that breeding in ponds or streams tends to concentrate amphibians in the same place at the same time, which increases the transmission of parasites. The process of metamorphosis decreases an amphibians immunity, which is another factor that benefits parasites at the expense of their amphibian hosts.

Todd said that the idea that parasites can influence reproductive strategies can be tested. A disease caused by a chytrid fungus is causing rapid declines i
'/>"/>

Contact: Sam Fahmy
sfahmy@uga.edu
706-542-5361
University of Georgia
Source:Eurekalert

Page: 1 2

Related biology news :

1. Adaptation to parasites drive African fishes along different evolutionary paths
2. Social parasites of the smaller kind
3. Coral reef fish harbor an unexpectedly high biodiversity of parasites
4. Predators and parasites may increase evolutionary stability
5. Ultra-low-dose aspirin might decrease bleeding severity in portal hypertension
6. New magnetic separation technique might detect multiple pathogens at once
7. Curry-derived molecules might be too spicy for colorectal cancers
8. Evolution is driven by gene regulation
9. Clones on task serve greater good, evolutionary study shows
10. Uncertainty drives the evolution of cooperative breeding in birds
11. Structure of 450 million year old protein reveals evolutions steps
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/18/2014)... stress-related psychiatric disorders are associated with increased ... mechanisms underlying this relation are unknown. Understanding ... of targeted preventive strategies and new or ... work is presented at the European College ... international group of researchers from Germany and ...
(Date:10/17/2014)... German . ... in order to reproduce? And why are there two sexes ... latest issue of the research journal Molecular Human Reproduction ... Ramm from Bielefeld University Bielefeld has compiled this special issue ... a female to copulate with several males in quick succession ...
(Date:10/16/2014)... William and Mary,s Virginia Institute of Marine Science ... Environmental Protection Agency to identify the streams and ... develop tools to help local governments and citizens ... critically on a dataset of tidal-marsh observations first ... with this historical baseline can today,s researchers accurately ...
Breaking Biology News(10 mins):Researchers find why depression and aging linked to increased disease risk 2Sperm wars 2EPA grant will help localities conserve headwater wetlands 2EPA grant will help localities conserve headwater wetlands 3
... Invasive species plants, animals, and microbes introduced to regions ... tag of $1.4 trillion dollars . They are responsible for ... and an uptick in infectious diseases. Not all non-native ... the last several decades teasing apart the conditions that set ...
... 2012 In forested regions of the nation, natural regeneration ... of maintaining the desired tree species. , A study by ... and Urban Greening showed that on average, 1 in ... from natural regeneration. However, for newly established, young trees in ...
... , When you take a dip in the ocean, nuclear fuel ... Earths oceans in trace amounts of just 3 parts per billion, ... billion tons of uranium enough to potentially fuel the worlds ... the ocean as a uranium source since the 1960s, but previous ...
Cached Biology News:Losing stream in our battle to predict and prevent invasive species 2Losing stream in our battle to predict and prevent invasive species 3Natural regeneration building urban forests, altering species composition 2Natural regeneration building urban forests, altering species composition 3
(Date:10/22/2014)... (PRWEB) October 22, 2014 Physicians ... its cardiovascular pharmacogenetics menu, which enables healthcare providers ... With PCLS’s evidence-based results, healthcare providers are ... optimize their therapy, while minimizing risks for adverse ... U.S., according to the FDA [1] more than ...
(Date:10/22/2014)... 22, 2014 Research and Markets  has ... by Material, by Application, Geography - Global Analysis and ... Organic electronics, also called as polymer ... science which deals with small conductive molecules and electrically ... molecules and polymers are carbon based, made using synthetic ...
(Date:10/20/2014)... , Oct. 20, 2014 Asterias Biotherapeutics, ... Company has signed a Notice of Grant Award ... (CIRM), effective October 1, 2014.  The NGA provides ... and the release of additional grant funds pursuant ... award for clinical development of Asterias, product, AST-OPC1. ...
(Date:10/20/2014)... OncLive® is pleased to ... Thomas Jefferson University has joined its Strategic Alliance ... Partnership program, the Sidney Kimmel Cancer Center at ... of the Center’s cutting-edge research programs, comprehensive approach ... other health care professionals from the Sidney Kimmel ...
Breaking Biology Technology:PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 2PCLS Announces Expansion of Cardiovascular Pharmacogenetic Testing Menu 3Global Organic Electronics (Semiconductor, Conductive, Dielectric and Substrate) Market - Analysis and Forecast (2014 - 2020) 2Global Organic Electronics (Semiconductor, Conductive, Dielectric and Substrate) Market - Analysis and Forecast (2014 - 2020) 3Asterias Biotherapeutics Announces Notice of Grant Award with CIRM for Phase 1/2a Clinical Trial of AST-OPC1 in Complete Cervical Spinal Cord Injury 2Asterias Biotherapeutics Announces Notice of Grant Award with CIRM for Phase 1/2a Clinical Trial of AST-OPC1 in Complete Cervical Spinal Cord Injury 3Asterias Biotherapeutics Announces Notice of Grant Award with CIRM for Phase 1/2a Clinical Trial of AST-OPC1 in Complete Cervical Spinal Cord Injury 4Sidney Kimmel Cancer Center at Thomas Jefferson University Partners With OncLive 2Sidney Kimmel Cancer Center at Thomas Jefferson University Partners With OncLive 3
... /PRNewswire-FirstCall/,-- Oridion Systems Ltd. (SWX: ORIDN) today ... leading global medical device and service company.,With ... technology in its new, compact and ultra-lightweight ... the importance of monitoring CO2, has,decided to ...
... $2.0 Million -, MONTVALE, N.J., Aug. 26 ... it has secured,$2.0 million through the sale of approximately ... under its June 2007 equity financing agreement,with an investment ... Pharmaceuticals exercised its option to complete the third,and final ...
... Calif., Aug. 26 The 2008 European ... presented to,Israel-based Vascular Biogenics Ltd. for developing ... has facilitated novel advancements,in gene expression-based treatments ... VTS(TM) platform is a potent and flexible ...
Cached Biology Technology:Oridion Expands its OEM Partnerships - New Agreement with Spacelabs Healthcare 2Oridion Expands its OEM Partnerships - New Agreement with Spacelabs Healthcare 3Oridion Expands its OEM Partnerships - New Agreement with Spacelabs Healthcare 4Memory Pharmaceuticals Closes Final Tranche of Equity Financing with The Stanley Medical Research Institute 2Memory Pharmaceuticals Closes Final Tranche of Equity Financing with The Stanley Medical Research Institute 3Vascular Biogenics Ltd. Presented With the Frost & Sullivan 2008 European Gene Expression Targeting Platform Technology Innovation Award 2Vascular Biogenics Ltd. Presented With the Frost & Sullivan 2008 European Gene Expression Targeting Platform Technology Innovation Award 3
... Dodeca silver stain kits are optimized ... including Bio-Rad Dodeca stainers. This silver ... of proteins in polyacrylamide gels and ... includes sensitizer concentrate, silver reagent concentrate, ...
... tubes and 96 well plates. microCLEAN is an ... a half spin DNA cleanup reagent. It can ... type of double stranded DNA, efficiently removing reaction ... or unlabelled). It is therefore ideally suited to ...
PTC-100 cycler with gold/silver block with Hot Bonnet heated lid, holds one 96-well V-plate or96x0.2ml tubes...
... (bluish-purple), DNA (blue), proteins (red) and acid polysaccharides ... traces: Ca ≤ 10 mg/kg Cd ≤ 5 mg/kg ... ≤ 5 mg/kg Fe ≤ 5 mg/kg K ≤ ... mg/kg Na ≤ 50 mg/kg Ni ≤ 5 mg/kg ...
Biology Products: